Class: Bitcoin::Script
- Inherits:
-
Object
- Object
- Bitcoin::Script
- Defined in:
- lib/bitcoin/script.rb
Defined Under Namespace
Classes: ScriptOpcodeError
Constant Summary collapse
- OP_0 =
0
- OP_FALSE =
0
- OP_1 =
81
- OP_TRUE =
81
- OP_2 =
0x52
- OP_3 =
0x53
- OP_4 =
0x54
- OP_5 =
0x55
- OP_6 =
0x56
- OP_7 =
0x57
- OP_8 =
0x58
- OP_9 =
0x59
- OP_10 =
0x5a
- OP_11 =
0x5b
- OP_12 =
0x5c
- OP_13 =
0x5d
- OP_14 =
0x5e
- OP_15 =
0x5f
- OP_16 =
0x60
- OP_PUSHDATA0 =
0
- OP_PUSHDATA1 =
76
- OP_PUSHDATA2 =
77
- OP_PUSHDATA4 =
78
- OP_PUSHDATA_INVALID =
0xEE
238
- OP_NOP =
97
- OP_DUP =
118
- OP_HASH160 =
169
- OP_EQUAL =
135
- OP_VERIFY =
105
- OP_EQUALVERIFY =
136
- OP_CHECKSIG =
172
- OP_CHECKSIGVERIFY =
173
- OP_CHECKMULTISIG =
174
- OP_CHECKMULTISIGVERIFY =
175
- OP_TOALTSTACK =
107
- OP_FROMALTSTACK =
108
- OP_TUCK =
125
- OP_SWAP =
124
- OP_BOOLAND =
154
- OP_ADD =
147
- OP_SUB =
148
- OP_GREATERTHANOREQUAL =
162
- OP_DROP =
117
- OP_HASH256 =
170
- OP_SHA256 =
168
- OP_SHA1 =
167
- OP_RIPEMD160 =
166
- OP_NOP1 =
176
- OP_NOP2 =
177
- OP_NOP3 =
178
- OP_NOP4 =
179
- OP_NOP5 =
180
- OP_NOP6 =
181
- OP_NOP7 =
182
- OP_NOP8 =
183
- OP_NOP9 =
184
- OP_NOP10 =
185
- OP_CODESEPARATOR =
171
- OP_MIN =
163
- OP_MAX =
164
- OP_2OVER =
112
- OP_2ROT =
113
- OP_2SWAP =
114
- OP_IFDUP =
115
- OP_DEPTH =
116
- OP_1NEGATE =
79
- OP_WITHIN =
165
- OP_NUMEQUAL =
156
- OP_NUMEQUALVERIFY =
157
- OP_LESSTHAN =
159
- OP_LESSTHANOREQUAL =
161
- OP_GREATERTHAN =
160
- OP_NOT =
145
- OP_0NOTEQUAL =
146
- OP_ABS =
144
- OP_1ADD =
139
- OP_1SUB =
140
- OP_NEGATE =
143
- OP_BOOLOR =
155
- OP_NUMNOTEQUAL =
158
- OP_RETURN =
106
- OP_OVER =
120
- OP_IF =
99
- OP_NOTIF =
100
- OP_ELSE =
103
- OP_ENDIF =
104
- OP_PICK =
121
- OP_SIZE =
130
- OP_VER =
98
- OP_ROLL =
122
- OP_ROT =
123
- OP_2DROP =
109
- OP_2DUP =
110
- OP_3DUP =
111
- OP_NIP =
119
- OP_CAT =
126
- OP_SUBSTR =
127
- OP_LEFT =
128
- OP_RIGHT =
129
- OP_INVERT =
131
- OP_AND =
132
- OP_OR =
133
- OP_XOR =
134
- OP_2MUL =
141
- OP_2DIV =
142
- OP_MUL =
149
- OP_DIV =
150
- OP_MOD =
151
- OP_LSHIFT =
152
- OP_RSHIFT =
153
- OP_INVALIDOPCODE =
0xff
- OPCODES =
Hash[*constants.grep(/^OP_/).map{|i| [const_get(i), i.to_s]
- OPCODES_ALIAS =
{ "OP_TRUE" => OP_1, "OP_FALSE" => OP_0, "OP_EVAL" => OP_NOP1, "OP_CHECKHASHVERIFY" => OP_NOP2, }
- DISABLED_OPCODES =
[ OP_CAT, OP_SUBSTR, OP_LEFT, OP_RIGHT, OP_INVERT, OP_AND, OP_OR, OP_XOR, OP_2MUL, OP_2DIV, OP_MUL, OP_DIV, OP_MOD, OP_LSHIFT, OP_RSHIFT ]
- OP_2_16 =
(82..96).to_a
- OPCODES_PARSE_BINARY =
{}
- OPCODES_PARSE_STRING =
{}
- SIGHASH_TYPE =
{ all: 1, none: 2, single: 3, anyonecanpay: 128 }
- OPCODES_METHOD =
Instance Attribute Summary collapse
-
#chunks ⇒ Object
readonly
Returns the value of attribute chunks.
-
#debug ⇒ Object
readonly
Returns the value of attribute debug.
-
#raw ⇒ Object
readonly
Returns the value of attribute raw.
-
#stack ⇒ Object
readonly
Returns the value of attribute stack.
Class Method Summary collapse
-
.add_sig_to_multisig_script_sig(sig, script_sig, hash_type = ) ⇒ Object
take a multisig script sig (or p2sh multisig script sig) and add another signature to it after the OP_0.
-
.binary_from_string(script_string) ⇒ Object
raw script binary of a string representation.
- .check_pubkey_encoding?(pubkey, opts = {}) ⇒ Boolean
-
.check_signature_encoding?(sig, opts = {}) ⇒ Boolean
Loosely matches CheckSignatureEncoding().
-
.compare_big_endian(c1, c2) ⇒ Object
Compares two arrays of bytes.
-
.decode_OP_N(opcode) ⇒ Object
Converts OP_0,1,2,…,16 into 0, 1, 2, …, 16.
- .drop_signatures(script_pubkey, drop_signatures) ⇒ Object
-
.from_string(input_script, previous_output_script = nil) ⇒ Object
script object of a string representation.
- .is_compressed_or_uncompressed_pub_key?(pubkey) ⇒ Boolean
- .is_defined_hashtype_signature?(sig) ⇒ Boolean
-
.is_der_signature?(sig) ⇒ Boolean
Loosely correlates with IsDERSignature() from interpreter.cpp.
-
.is_low_der_signature?(sig) ⇒ Boolean
Loosely correlates with IsLowDERSignature() from interpreter.cpp.
- .pack_pushdata(data) ⇒ Object
- .pack_pushdata_align(pushdata, len, data) ⇒ Object
-
.sort_p2sh_multisig_signatures(script_sig, sig_hash) ⇒ Object
Sort signatures in the given
script_sig
according to the order of pubkeys in the redeem script. -
.to_address_script(address) ⇒ Object
generate hash160 or p2sh output script, depending on the type of the given
address
. -
.to_hash160_script(hash160) ⇒ Object
generate hash160 tx for given
address
. -
.to_multisig_script(m, *pubkeys) ⇒ Object
generate multisig output script for given
pubkeys
, expectingm
signatures. -
.to_multisig_script_sig(*sigs) ⇒ Object
generate input script sig spending a multisig output script.
-
.to_op_return_script(data = nil) ⇒ Object
generate OP_RETURN output script with given data.
-
.to_p2sh_multisig_script(*args) ⇒ Object
generate p2sh multisig output script for given
args
. -
.to_p2sh_multisig_script_sig(redeem_script, *sigs) ⇒ Object
generate input script sig spending a p2sh-multisig output script.
-
.to_p2sh_script(p2sh) ⇒ Object
generate p2sh output script for given
p2sh
hash160. -
.to_pubkey_script(pubkey) ⇒ Object
generate pubkey tx script for given
pubkey
. -
.to_pubkey_script_sig(signature, pubkey, hash_type = ) ⇒ Object
generate input script sig spending a pubkey output with given
signature
andpubkey
. -
.to_signature_pubkey_script(*a) ⇒ Object
alias for #to_pubkey_script_sig.
Instance Method Summary collapse
-
#append_opcode(opcode) ⇒ Object
Adds opcode (OP_0, OP_1, … OP_CHECKSIG etc.) Returns self.
-
#append_pushdata(pushdata_string) ⇒ Object
Adds binary string as pushdata.
- #cast_to_bignum(buf) ⇒ Object
- #cast_to_bool(buf) ⇒ Object
- #cast_to_string(buf) ⇒ Object
- #check_pushes(push_only = true, canonical_only = false, buf) ⇒ Object
- #codehash_script(opcode) ⇒ Object
-
#get_address ⇒ Object
get single address, or first for multisig script.
-
#get_addresses ⇒ Object
get all addresses this script corresponds to (if possible).
-
#get_hash160 ⇒ Object
get the hash160 for this hash160 or pubkey script.
-
#get_hash160_address ⇒ Object
get the hash160 address for this hash160 script.
- #get_keys_provided ⇒ Object
-
#get_multisig_addresses ⇒ Object
get the pubkey addresses for this multisig script.
-
#get_multisig_pubkeys ⇒ Object
get the public keys for this multisig script.
-
#get_op_return_data ⇒ Object
get the data possibly included in an OP_RETURN script.
- #get_p2sh_address ⇒ Object
-
#get_pubkey ⇒ Object
get the public key for this pubkey script.
-
#get_pubkey_address ⇒ Object
get the pubkey address for this pubkey script.
- #get_signatures_required ⇒ Object
-
#initialize(input_script, previous_output_script = nil) ⇒ Script
constructor
create a new script.
- #inner_p2sh!(script = nil) ⇒ Object
- #inner_p2sh? ⇒ Boolean
-
#inner_p2sh_script ⇒ Object
get the inner p2sh script.
- #invalid ⇒ Object
- #invalid? ⇒ Boolean
-
#is_hash160? ⇒ Boolean
is this a hash160 (address) script.
-
#is_multisig? ⇒ Boolean
is this a multisig script.
-
#is_op_return? ⇒ Boolean
is this an op_return script.
-
#is_pay_to_script_hash? ⇒ Boolean
(also: #is_p2sh?)
is this a :script_hash (pay-to-script-hash/p2sh) script?.
-
#is_pubkey? ⇒ Boolean
(also: #is_send_to_ip?)
is this a pubkey script.
-
#is_push_only?(script_data = nil) ⇒ Boolean
Verify the script is only pushing data onto the stack.
-
#is_standard? ⇒ Boolean
check if script is in one of the recognized standard formats.
-
#op_0 ⇒ Object
An empty array of bytes is pushed onto the stack.
- #op_0notequal ⇒ Object
-
#op_1 ⇒ Object
The number 1 is pushed onto the stack.
-
#op_1add ⇒ Object
1 is added to the input.
-
#op_1negate ⇒ Object
The number -1 is pushed onto the stack.
-
#op_1sub ⇒ Object
1 is subtracted from the input.
-
#op_2div ⇒ Object
The input is divided by 2.
-
#op_2drop ⇒ Object
Removes the top two stack items.
-
#op_2dup ⇒ Object
Duplicates the top two stack items.
-
#op_2mul ⇒ Object
The input is multiplied by 2.
-
#op_2over ⇒ Object
Copies the pair of items two spaces back in the stack to the front.
-
#op_2rot ⇒ Object
The fifth and sixth items back are moved to the top of the stack.
-
#op_2swap ⇒ Object
Swaps the top two pairs of items.
-
#op_3dup ⇒ Object
Duplicates the top three stack items.
-
#op_abs ⇒ Object
The input is made positive.
-
#op_add ⇒ Object
a is added to b.
-
#op_booland ⇒ Object
If both a and b are not 0, the output is 1.
-
#op_boolor ⇒ Object
If a or b is not 0, the output is 1.
-
#op_checkmultisig(check_callback, opts = {}) ⇒ Object
do a CHECKMULTISIG operation on the current stack, asking
check_callback
to do the actual signature verification. -
#op_checkmultisigverify(check_callback, opts = {}) ⇒ Object
Same as OP_CHECKMULTISIG, but OP_VERIFY is executed afterward.
-
#op_checksig(check_callback, opts = {}) ⇒ Object
do a CHECKSIG operation on the current stack, asking
check_callback
to do the actual signature verification. -
#op_checksigverify(check_callback, opts = {}) ⇒ Object
Same as OP_CHECKSIG, but OP_VERIFY is executed afterward.
-
#op_codeseparator ⇒ Object
All of the signature checking words will only match signatures to the data after the most recently-executed OP_CODESEPARATOR.
-
#op_depth ⇒ Object
Puts the number of stack items onto the stack.
-
#op_drop ⇒ Object
Removes the top stack item.
-
#op_dup ⇒ Object
Duplicates the top stack item.
-
#op_else ⇒ Object
If the preceding OP_IF or OP_NOTIF or OP_ELSE was not executed then these statements are and if the preceding OP_IF or OP_NOTIF or OP_ELSE was executed then these statements are not.
-
#op_endif ⇒ Object
Ends an if/else block.
-
#op_equal ⇒ Object
Returns 1 if the inputs are exactly equal, 0 otherwise.
-
#op_equalverify ⇒ Object
Same as OP_EQUAL, but runs OP_VERIFY afterward.
-
#op_fromaltstack ⇒ Object
Puts the input onto the top of the main stack.
-
#op_greaterthan ⇒ Object
Returns 1 if a is greater than b, 0 otherwise.
-
#op_greaterthanorequal ⇒ Object
Returns 1 if a is greater than or equal to b, 0 otherwise.
-
#op_hash160 ⇒ Object
The input is hashed twice: first with SHA-256 and then with RIPEMD-160.
-
#op_hash256 ⇒ Object
The input is hashed two times with SHA-256.
-
#op_if ⇒ Object
If the top stack value is not 0, the statements are executed.
-
#op_ifdup ⇒ Object
If the input is true, duplicate it.
-
#op_lessthan ⇒ Object
Returns 1 if a is less than b, 0 otherwise.
-
#op_lessthanorequal ⇒ Object
Returns 1 if a is less than or equal to b, 0 otherwise.
-
#op_max ⇒ Object
Returns the larger of a and b.
-
#op_min ⇒ Object
Returns the smaller of a and b.
-
#op_negate ⇒ Object
The sign of the input is flipped.
-
#op_nip ⇒ Object
Removes the second-to-top stack item.
-
#op_nop ⇒ Object
Does nothing.
-
#op_nop1 ⇒ Object
op_eval: en.bitcoin.it/wiki/BIP_0012 the BIP was never accepted and must be handled as old OP_NOP1.
- #op_nop10 ⇒ Object
- #op_nop2 ⇒ Object
- #op_nop3 ⇒ Object
- #op_nop4 ⇒ Object
- #op_nop5 ⇒ Object
- #op_nop6 ⇒ Object
- #op_nop7 ⇒ Object
- #op_nop8 ⇒ Object
- #op_nop9 ⇒ Object
-
#op_not ⇒ Object
If the input is 0 or 1, it is flipped.
-
#op_notif ⇒ Object
If the top stack value is 0, the statements are executed.
-
#op_numequal ⇒ Object
Returns 1 if the numbers are equal, 0 otherwise.
-
#op_numequalverify ⇒ Object
Same as OP_NUMEQUAL, but runs OP_VERIFY afterward.
-
#op_numnotequal ⇒ Object
Returns 1 if the numbers are not equal, 0 otherwise.
-
#op_over ⇒ Object
Copies the second-to-top stack item to the top.
-
#op_pick ⇒ Object
The item n back in the stack is copied to the top.
-
#op_return ⇒ Object
Marks transaction as invalid.
-
#op_ripemd160 ⇒ Object
The input is hashed using RIPEMD-160.
-
#op_roll ⇒ Object
The item n back in the stack is moved to the top.
-
#op_rot ⇒ Object
The top three items on the stack are rotated to the left.
-
#op_sha1 ⇒ Object
The input is hashed using SHA-1.
-
#op_sha256 ⇒ Object
The input is hashed using SHA-256.
-
#op_size ⇒ Object
Returns the length of the input string.
-
#op_sub ⇒ Object
b is subtracted from a.
-
#op_swap ⇒ Object
The top two items on the stack are swapped.
-
#op_toaltstack ⇒ Object
Puts the input onto the top of the alt stack.
-
#op_tuck ⇒ Object
The item at the top of the stack is copied and inserted before the second-to-top item.
-
#op_ver ⇒ Object
Transaction is invalid unless occuring in an unexecuted OP_IF branch.
-
#op_verify ⇒ Object
Marks transaction as invalid if top stack value is not true.
-
#op_within ⇒ Object
Returns 1 if x is within the specified range (left-inclusive), 0 otherwise.
-
#parse(bytes, offset = 0) ⇒ Object
parse raw script.
-
#pay_to_script_hash(block_timestamp, opts, check_callback) ⇒ Object
pay_to_script_hash: en.bitcoin.it/wiki/BIP_0016.
- #pop_int(count = nil) ⇒ Object
- #pop_string(count = nil) ⇒ Object
-
#pushes_are_canonical?(script_data = nil) ⇒ Boolean
Make sure opcodes used to push data match their intended length ranges.
-
#run(block_timestamp = Time.now.to_i, opts = {}, &check_callback) ⇒ Object
run the script.
- #sighash_subscript(drop_sigs) ⇒ Object
-
#sigops_count_accurate(is_accurate) ⇒ Object
This matches CScript::GetSigOpCount(bool fAccurate) Note: this does not cover P2SH script which is to be unserialized and checked explicitly when validating blocks.
-
#sigops_count_for_p2sh ⇒ Object
This method applies to script_sig that is an input for p2sh output.
- #to_binary(chunks = nil) ⇒ Object (also: #to_payload)
- #to_binary_without_signatures(drop_signatures, chunks = nil) ⇒ Object
-
#to_string(chunks = nil) ⇒ Object
string representation of the script.
-
#type ⇒ Object
get type of this tx.
Constructor Details
#initialize(input_script, previous_output_script = nil) ⇒ Script
create a new script. bytes
is typically input_script + output_script
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# File 'lib/bitcoin/script.rb', line 158 def initialize(input_script, previous_output_script=nil) @raw_byte_sizes = [input_script.bytesize, previous_output_script ? previous_output_script.bytesize : 0] @input_script, @previous_output_script = input_script, previous_output_script @raw = if @previous_output_script @input_script + [ Bitcoin::Script::OP_CODESEPARATOR ].pack("C") + @previous_output_script else @input_script end @chunks = parse(@input_script) if previous_output_script @script_codeseparator_index = @chunks.size @chunks << Bitcoin::Script::OP_CODESEPARATOR @chunks += parse(@previous_output_script) end @stack, @stack_alt, @exec_stack = [], [], [] @last_codeseparator_index = 0 @do_exec = true end |
Instance Attribute Details
#chunks ⇒ Object (readonly)
Returns the value of attribute chunks.
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# File 'lib/bitcoin/script.rb', line 155 def chunks @chunks end |
#debug ⇒ Object (readonly)
Returns the value of attribute debug.
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# File 'lib/bitcoin/script.rb', line 155 def debug @debug end |
#raw ⇒ Object (readonly)
Returns the value of attribute raw.
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# File 'lib/bitcoin/script.rb', line 155 def raw @raw end |
#stack ⇒ Object (readonly)
Returns the value of attribute stack.
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# File 'lib/bitcoin/script.rb', line 155 def stack @stack end |
Class Method Details
.add_sig_to_multisig_script_sig(sig, script_sig, hash_type = ) ⇒ Object
take a multisig script sig (or p2sh multisig script sig) and add another signature to it after the OP_0. Used to sign a tx by multiple parties. Signatures must be in the same order as the pubkeys in the output script being redeemed.
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# File 'lib/bitcoin/script.rb', line 793 def self.add_sig_to_multisig_script_sig(sig, script_sig, hash_type = SIGHASH_TYPE[:all]) signature = sig + [hash_type].pack("C*") offset = script_sig.empty? ? 0 : 1 script_sig.insert(offset, pack_pushdata(signature)) end |
.binary_from_string(script_string) ⇒ Object
raw script binary of a string representation
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# File 'lib/bitcoin/script.rb', line 369 def self.binary_from_string(script_string) buf = "" script_string.split(" ").each{|i| i = if opcode = OPCODES_PARSE_STRING[i] opcode else case i when /OP_PUSHDATA/ # skip when /OP_(.+)$/; raise ScriptOpcodeError, "#{i} not defined!" when /\(opcode\-(\d+)\)/; $1.to_i when "(opcode"; # skip # fix invalid opcode parsing when /^(\d+)\)/; $1.to_i # fix invalid opcode parsing when /(\d+):(\d+):(.+)?/ pushdata, len, data = $1.to_i, $2.to_i, $3 pack_pushdata_align(pushdata, len, [data].pack("H*")) else data = [i].pack("H*") pack_pushdata(data) end end buf << if i.is_a?(Fixnum) i < 256 ? [i].pack("C") : [OpenSSL::BN.new(i.to_s,10).to_hex].pack("H*") else i end if i } buf end |
.check_pubkey_encoding?(pubkey, opts = {}) ⇒ Boolean
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# File 'lib/bitcoin/script.rb', line 1452 def self.check_pubkey_encoding?(pubkey, opts={}) return false if opts[:verify_strictenc] && !is_compressed_or_uncompressed_pub_key?(pubkey) true end |
.check_signature_encoding?(sig, opts = {}) ⇒ Boolean
Loosely matches CheckSignatureEncoding()
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# File 'lib/bitcoin/script.rb', line 1471 def self.check_signature_encoding?(sig, opts={}) return true if sig.bytesize == 0 return false if (opts[:verify_dersig] || opts[:verify_low_s] || opts[:verify_strictenc]) and !is_der_signature?(sig) return false if opts[:verify_low_s] && !is_low_der_signature?(sig) return false if opts[:verify_strictenc] && !is_defined_hashtype_signature?(sig) true end |
.compare_big_endian(c1, c2) ⇒ Object
Compares two arrays of bytes
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# File 'lib/bitcoin/script.rb', line 1515 def self.compare_big_endian(c1, c2) c1, c2 = c1.dup, c2.dup # Clone the arrays while c1.size > c2.size return 1 if c1.shift > 0 end while c2.size > c1.size return -1 if c2.shift > 0 end c1.size.times{|idx| return c1[idx] - c2[idx] if c1[idx] != c2[idx] } 0 end |
.decode_OP_N(opcode) ⇒ Object
Converts OP_0,1,2,…,16 into 0, 1, 2, …, 16. Returns nil for other opcodes.
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# File 'lib/bitcoin/script.rb', line 887 def self.decode_OP_N(opcode) if opcode == OP_0 return 0 end if opcode.is_a?(Fixnum) && opcode >= OP_1 && opcode <= OP_16 return opcode - (OP_1 - 1); else nil end end |
.drop_signatures(script_pubkey, drop_signatures) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 483 def self.drop_signatures(script_pubkey, drop_signatures) script = new(script_pubkey).to_string.split(" ").delete_if{|c| drop_signatures.include?(c) }.join(" ") script_pubkey = binary_from_string(script) end |
.from_string(input_script, previous_output_script = nil) ⇒ Object
script object of a string representation
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# File 'lib/bitcoin/script.rb', line 358 def self.from_string(input_script, previous_output_script=nil) if previous_output_script new(binary_from_string(input_script), binary_from_string(previous_output_script)) else new(binary_from_string(input_script)) end end |
.is_compressed_or_uncompressed_pub_key?(pubkey) ⇒ Boolean
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# File 'lib/bitcoin/script.rb', line 1457 def self.is_compressed_or_uncompressed_pub_key?(pubkey) return false if pubkey.bytesize < 33 # "Non-canonical public key: too short" case pubkey[0] when "\x04" return false if pubkey.bytesize != 65 # "Non-canonical public key: invalid length for uncompressed key" when "\x02", "\x03" return false if pubkey.bytesize != 33 # "Non-canonical public key: invalid length for compressed key" else return false # "Non-canonical public key: compressed nor uncompressed" end true end |
.is_defined_hashtype_signature?(sig) ⇒ Boolean
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# File 'lib/bitcoin/script.rb', line 1551 def self.is_defined_hashtype_signature?(sig) return false if sig.empty? s = sig.unpack("C*") hash_type = s[-1] & (~(SIGHASH_TYPE[:anyonecanpay])) return false if hash_type < SIGHASH_TYPE[:all] || hash_type > SIGHASH_TYPE[:single] # Non-canonical signature: unknown hashtype byte true end |
.is_der_signature?(sig) ⇒ Boolean
Loosely correlates with IsDERSignature() from interpreter.cpp
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# File 'lib/bitcoin/script.rb', line 1480 def self.is_der_signature?(sig) return false if sig.bytesize < 9 # Non-canonical signature: too short return false if sig.bytesize > 73 # Non-canonical signature: too long s = sig.unpack("C*") return false if s[0] != 0x30 # Non-canonical signature: wrong type return false if s[1] != s.size-3 # Non-canonical signature: wrong length marker length_r = s[3] return false if (5 + length_r) >= s.size # Non-canonical signature: S length misplaced length_s = s[5+length_r] return false if (length_r + length_s + 7) != s.size # Non-canonical signature: R+S length mismatch return false if s[2] != 0x02 # Non-canonical signature: R value type mismatch return false if length_r == 0 # Non-canonical signature: R length is zero r_val = s.slice(4, length_r) return false if r_val[0] & 0x80 != 0 # Non-canonical signature: R value negative return false if length_r > 1 && (r_val[0] == 0x00) && !(r_val[1] & 0x80 != 0) # Non-canonical signature: R value excessively padded s_val = s.slice(6 + length_r, length_s) return false if s[6 + length_r - 2] != 0x02 # Non-canonical signature: S value type mismatch return false if length_s == 0 # Non-canonical signature: S length is zero return false if (s_val[0] & 0x80) != 0 # Non-canonical signature: S value negative return false if length_s > 1 && (s_val[0] == 0x00) && !(s_val[1] & 0x80) # Non-canonical signature: S value excessively padded true end |
.is_low_der_signature?(sig) ⇒ Boolean
Loosely correlates with IsLowDERSignature() from interpreter.cpp
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# File 'lib/bitcoin/script.rb', line 1531 def self.is_low_der_signature?(sig) s = sig.unpack("C*") length_r = s[3] length_s = s[5+length_r] s_val = s.slice(6 + length_r, length_s) # If the S value is above the order of the curve divided by two, its # complement modulo the order could have been used instead, which is # one byte shorter when encoded correctly. max_mod_half_order = [ 0x7f,0xff,0xff,0xff,0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, 0x5d,0x57,0x6e,0x73,0x57,0xa4,0x50,0x1d, 0xdf,0xe9,0x2f,0x46,0x68,0x1b,0x20,0xa0] compare_big_endian(s_val, [0]) > 0 && compare_big_endian(s_val, max_mod_half_order) <= 0 end |
.pack_pushdata(data) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 321 def self.pack_pushdata(data) size = data.bytesize if data.bitcoin_pushdata size = data.bitcoin_pushdata_length pack_pushdata_align(data.bitcoin_pushdata, size, data) else head = if size < OP_PUSHDATA1 [size].pack("C") elsif size <= 0xff [OP_PUSHDATA1, size].pack("CC") elsif size <= 0xffff [OP_PUSHDATA2, size].pack("Cv") #elsif size <= 0xffffffff else [OP_PUSHDATA4, size].pack("CV") end head + data end end |
.pack_pushdata_align(pushdata, len, data) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 342 def self.pack_pushdata_align(pushdata, len, data) case pushdata when OP_PUSHDATA1 [OP_PUSHDATA1, len].pack("CC") + data when OP_PUSHDATA2 [OP_PUSHDATA2, len].pack("Cv") + data when OP_PUSHDATA4 [OP_PUSHDATA4, len].pack("CV") + data when OP_PUSHDATA_INVALID data else # OP_PUSHDATA0 [len].pack("C") + data end end |
.sort_p2sh_multisig_signatures(script_sig, sig_hash) ⇒ Object
Sort signatures in the given script_sig
according to the order of pubkeys in the redeem script. Also needs the sig_hash
to match signatures to pubkeys.
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# File 'lib/bitcoin/script.rb', line 808 def self.sort_p2sh_multisig_signatures script_sig, sig_hash script = new(script_sig) redeem_script = new(script.chunks[-1]) pubkeys = redeem_script.get_multisig_pubkeys # find the pubkey for each signature by trying to verify it sigs = Hash[script.chunks[1...-1].map.with_index do |sig, idx| pubkey = pubkeys.map {|key| Bitcoin::Key.new(nil, key.hth).verify(sig_hash, sig) ? key : nil }.compact.first raise "Key for signature ##{idx} not found in redeem script!" unless pubkey [pubkey, sig] end] [OP_0].pack("C*") + pubkeys.map {|k| sigs[k] ? pack_pushdata(sigs[k]) : nil }.join + pack_pushdata(redeem_script.raw) end |
.to_address_script(address) ⇒ Object
generate hash160 or p2sh output script, depending on the type of the given address
. see #to_hash160_script and #to_p2sh_script.
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# File 'lib/bitcoin/script.rb', line 718 def self.to_address_script(address) hash160 = Bitcoin.hash160_from_address(address) case Bitcoin.address_type(address) when :hash160; to_hash160_script(hash160) when :p2sh; to_p2sh_script(hash160) end end |
.to_hash160_script(hash160) ⇒ Object
generate hash160 tx for given address
. returns a raw binary script of the form:
OP_DUP OP_HASH160 <hash160> OP_EQUALVERIFY OP_CHECKSIG
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# File 'lib/bitcoin/script.rb', line 702 def self.to_hash160_script(hash160) return nil unless hash160 # DUP HASH160 length hash160 EQUALVERIFY CHECKSIG [ ["76", "a9", "14", hash160, "88", "ac"].join ].pack("H*") end |
.to_multisig_script(m, *pubkeys) ⇒ Object
generate multisig output script for given pubkeys
, expecting m
signatures. returns a raw binary script of the form:
<m> <pubkey> [<pubkey> ...] <n_pubkeys> OP_CHECKMULTISIG
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# File 'lib/bitcoin/script.rb', line 729 def self.to_multisig_script(m, *pubkeys) raise "invalid m-of-n number" unless [m, pubkeys.size].all?{|i| (0..20).include?(i) } raise "invalid m-of-n number" if pubkeys.size < m pubs = pubkeys.map{|pk| pack_pushdata([pk].pack("H*")) } m = m > 16 ? pack_pushdata([m].pack("C")) : [80 + m.to_i].pack("C") n = pubkeys.size > 16 ? pack_pushdata([pubkeys.size].pack("C")) : [80 + pubs.size].pack("C") [ m, *pubs, n, [OP_CHECKMULTISIG].pack("C")].join end |
.to_multisig_script_sig(*sigs) ⇒ Object
generate input script sig spending a multisig output script. returns a raw binary script sig of the form:
OP_0 <sig> [<sig> ...]
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# File 'lib/bitcoin/script.rb', line 782 def self.to_multisig_script_sig(*sigs) hash_type = sigs.last.is_a?(Numeric) ? sigs.pop : SIGHASH_TYPE[:all] partial_script = [OP_0].pack("C*") sigs.reverse_each{ |sig| partial_script = add_sig_to_multisig_script_sig(sig, partial_script, hash_type) } partial_script end |
.to_op_return_script(data = nil) ⇒ Object
generate OP_RETURN output script with given data. returns a raw binary script of the form:
OP_RETURN <data>
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# File 'lib/bitcoin/script.rb', line 742 def self.to_op_return_script(data = nil) buf = [ OP_RETURN ].pack("C") return buf unless data return buf + pack_pushdata( [data].pack("H*") ) end |
.to_p2sh_multisig_script(*args) ⇒ Object
generate p2sh multisig output script for given args
. returns the p2sh output script, and the redeem script needed to spend it. see #to_multisig_script for the redeem script, and #to_p2sh_script for the p2sh script.
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# File 'lib/bitcoin/script.rb', line 768 def self.to_p2sh_multisig_script(*args) redeem_script = to_multisig_script(*args) p2sh_script = to_p2sh_script(Bitcoin.hash160(redeem_script.hth)) return p2sh_script, redeem_script end |
.to_p2sh_multisig_script_sig(redeem_script, *sigs) ⇒ Object
generate input script sig spending a p2sh-multisig output script. returns a raw binary script sig of the form:
OP_0 <sig> [<sig> ...] <redeem_script>
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# File 'lib/bitcoin/script.rb', line 802 def self.to_p2sh_multisig_script_sig(redeem_script, *sigs) to_multisig_script_sig(*sigs.flatten) + pack_pushdata(redeem_script) end |
.to_p2sh_script(p2sh) ⇒ Object
generate p2sh output script for given p2sh
hash160. returns a raw binary script of the form:
OP_HASH160 <p2sh> OP_EQUAL
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# File 'lib/bitcoin/script.rb', line 710 def self.to_p2sh_script(p2sh) return nil unless p2sh # HASH160 length hash EQUAL [ ["a9", "14", p2sh, "87"].join ].pack("H*") end |
.to_pubkey_script(pubkey) ⇒ Object
generate pubkey tx script for given pubkey
. returns a raw binary script of the form:
<pubkey> OP_CHECKSIG
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# File 'lib/bitcoin/script.rb', line 696 def self.to_pubkey_script(pubkey) pack_pushdata([pubkey].pack("H*")) + [ OP_CHECKSIG ].pack("C") end |
.to_pubkey_script_sig(signature, pubkey, hash_type = ) ⇒ Object
generate input script sig spending a pubkey output with given signature
and pubkey
. returns a raw binary script sig of the form:
<signature> [<pubkey>]
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# File 'lib/bitcoin/script.rb', line 751 def self.to_pubkey_script_sig(signature, pubkey, hash_type = SIGHASH_TYPE[:all]) buf = pack_pushdata(signature + [hash_type].pack("C")) return buf unless pubkey expected_size = case pubkey[0] when "\x04"; 65 when "\x02", "\x03"; 33 end raise "pubkey is not in binary form" if !expected_size || pubkey.bytesize != expected_size return buf + pack_pushdata(pubkey) end |
.to_signature_pubkey_script(*a) ⇒ Object
alias for #to_pubkey_script_sig
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# File 'lib/bitcoin/script.rb', line 775 def self.to_signature_pubkey_script(*a) to_pubkey_script_sig(*a) end |
Instance Method Details
#append_opcode(opcode) ⇒ Object
Adds opcode (OP_0, OP_1, … OP_CHECKSIG etc.) Returns self.
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# File 'lib/bitcoin/script.rb', line 302 def append_opcode(opcode) raise "Opcode should be a Fixnum" if !opcode.is_a?(Fixnum) if opcode >= OP_0 && opcode <= 0xff @chunks << opcode else raise "Opcode should be within [0x00, 0xff]" end self end |
#append_pushdata(pushdata_string) ⇒ Object
Adds binary string as pushdata. Pushdata will be encoded in the most compact form (unless the string contains internal info about serialization that’s added by Script class) Returns self.
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# File 'lib/bitcoin/script.rb', line 315 def append_pushdata(pushdata_string) raise "Pushdata should be a string" if !pushdata_string.is_a?(String) @chunks << pushdata_string self end |
#cast_to_bignum(buf) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 1283 def cast_to_bignum(buf) return (invalid; 0) unless buf case buf when Numeric invalid if OpenSSL::BN.new(buf.to_s).to_s(0).unpack("N")[0] > 4 buf when String invalid if buf.bytesize > 4 OpenSSL::BN.new([buf.bytesize].pack("N") + buf.reverse, 0).to_i else; raise TypeError, 'cast_to_bignum: failed to cast: %s (%s)' % [buf, buf.class] end end |
#cast_to_bool(buf) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 1305 def cast_to_bool(buf) buf = cast_to_string(buf).unpack("C*") size = buf.size buf.each.with_index{|byte,index| if byte != 0 # Can be negative zero if (index == (size-1)) && byte == 0x80 return false else return true end end } return false end |
#cast_to_string(buf) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 1296 def cast_to_string(buf) return (invalid; "") unless buf case buf when Numeric; OpenSSL::BN.new(buf.to_s).to_s(0)[4..-1].reverse when String; buf; else; raise TypeError, 'cast_to_string: failed to cast: %s (%s)' % [buf, buf.class] end end |
#check_pushes(push_only = true, canonical_only = false, buf) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 582 def check_pushes(push_only=true, canonical_only=false, buf) program = buf.unpack("C*") until program.empty? opcode = program.shift if opcode > OP_16 return false if push_only next end if opcode < OP_PUSHDATA1 && opcode > OP_0 # Could have used an OP_n code, rather than a 1-byte push. return false if canonical_only && opcode == 1 && program[0] <= 16 program.shift(opcode) end if opcode == OP_PUSHDATA1 len = program.shift(1)[0] # Could have used a normal n-byte push, rather than OP_PUSHDATA1. return false if canonical_only && len < OP_PUSHDATA1 program.shift(len) end if opcode == OP_PUSHDATA2 len = program.shift(2).pack("C*").unpack("v")[0] # Could have used an OP_PUSHDATA1. return false if canonical_only && len <= 0xff program.shift(len) end if opcode == OP_PUSHDATA4 len = program.shift(4).pack("C*").unpack("V")[0] # Could have used an OP_PUSHDATA2. return false if canonical_only && len <= 0xffff program.shift(len) end end true rescue => ex # catch parsing errors false end |
#codehash_script(opcode) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 1333 def codehash_script(opcode) # CScript scriptCode(pbegincodehash, pend); script = to_string(@chunks[(@codehash_start||0)...@chunks.size-@chunks.reverse.index(opcode)]) checkhash = Bitcoin.hash160(Bitcoin::Script.binary_from_string(script).unpack("H*")[0]) [script, checkhash] end |
#get_address ⇒ Object
get single address, or first for multisig script
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# File 'lib/bitcoin/script.rb', line 689 def get_address addrs = get_addresses addrs.is_a?(Array) ? addrs[0] : addrs end |
#get_addresses ⇒ Object
get all addresses this script corresponds to (if possible)
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# File 'lib/bitcoin/script.rb', line 680 def get_addresses return [get_pubkey_address] if is_pubkey? return [get_hash160_address] if is_hash160? return get_multisig_addresses if is_multisig? return [get_p2sh_address] if is_p2sh? [] end |
#get_hash160 ⇒ Object
get the hash160 for this hash160 or pubkey script
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# File 'lib/bitcoin/script.rb', line 643 def get_hash160 return @chunks[2..-3][0].unpack("H*")[0] if is_hash160? return @chunks[-2].unpack("H*")[0] if is_p2sh? return Bitcoin.hash160(get_pubkey) if is_pubkey? end |
#get_hash160_address ⇒ Object
get the hash160 address for this hash160 script
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# File 'lib/bitcoin/script.rb', line 650 def get_hash160_address Bitcoin.hash160_to_address(get_hash160) end |
#get_keys_provided ⇒ Object
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# File 'lib/bitcoin/script.rb', line 830 def get_keys_provided return false unless is_multisig? @chunks[-2] - 80 end |
#get_multisig_addresses ⇒ Object
get the pubkey addresses for this multisig script
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# File 'lib/bitcoin/script.rb', line 660 def get_multisig_addresses get_multisig_pubkeys.map{|pub| begin Bitcoin::Key.new(nil, pub.unpack("H*")[0]).addr rescue OpenSSL::PKey::ECError, OpenSSL::PKey::EC::Point::Error end } end |
#get_multisig_pubkeys ⇒ Object
get the public keys for this multisig script
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# File 'lib/bitcoin/script.rb', line 655 def get_multisig_pubkeys 1.upto(@chunks[-2] - 80).map{|i| @chunks[i] } end |
#get_op_return_data ⇒ Object
get the data possibly included in an OP_RETURN script
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# File 'lib/bitcoin/script.rb', line 674 def get_op_return_data return nil unless is_op_return? cast_to_string(@chunks[1]).unpack("H*")[0] if @chunks[1] end |
#get_p2sh_address ⇒ Object
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# File 'lib/bitcoin/script.rb', line 669 def get_p2sh_address Bitcoin.hash160_to_p2sh_address(get_hash160) end |
#get_pubkey ⇒ Object
get the public key for this pubkey script
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# File 'lib/bitcoin/script.rb', line 632 def get_pubkey return @chunks[0].unpack("H*")[0] if @chunks.size == 1 is_pubkey? ? @chunks[0].unpack("H*")[0] : nil end |
#get_pubkey_address ⇒ Object
get the pubkey address for this pubkey script
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# File 'lib/bitcoin/script.rb', line 638 def get_pubkey_address Bitcoin.pubkey_to_address(get_pubkey) end |
#get_signatures_required ⇒ Object
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# File 'lib/bitcoin/script.rb', line 825 def get_signatures_required return false unless is_multisig? @chunks[0] - 80 end |
#inner_p2sh!(script = nil) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 507 def inner_p2sh!(script=nil); @inner_p2sh = true; @inner_script_code = script; self; end |
#inner_p2sh? ⇒ Boolean
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# File 'lib/bitcoin/script.rb', line 508 def inner_p2sh?; @inner_p2sh; end |
#inner_p2sh_script ⇒ Object
get the inner p2sh script
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# File 'lib/bitcoin/script.rb', line 511 def inner_p2sh_script return nil if @chunks.size < 4 *rest, script, _, script_hash, _ = @chunks script = rest.pop if script == OP_CODESEPARATOR script, script_hash = cast_to_string(script), cast_to_string(script_hash) return nil unless Bitcoin.hash160(script.unpack("H*")[0]) == script_hash.unpack("H*")[0] script end |
#invalid ⇒ Object
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# File 'lib/bitcoin/script.rb', line 479 def invalid @script_invalid = true; nil end |
#invalid? ⇒ Boolean
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# File 'lib/bitcoin/script.rb', line 399 def invalid? @script_invalid ||= false end |
#is_hash160? ⇒ Boolean
is this a hash160 (address) script
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# File 'lib/bitcoin/script.rb', line 554 def is_hash160? return false if @chunks.size != 5 (@chunks[0..1] + @chunks[-2..-1]) == [OP_DUP, OP_HASH160, OP_EQUALVERIFY, OP_CHECKSIG] && @chunks[2].is_a?(String) && @chunks[2].bytesize == 20 end |
#is_multisig? ⇒ Boolean
is this a multisig script
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# File 'lib/bitcoin/script.rb', line 562 def is_multisig? return false if @chunks.size < 4 || !@chunks[-2].is_a?(Fixnum) @chunks[-1] == OP_CHECKMULTISIG and get_multisig_pubkeys.all?{|c| c.is_a?(String) } end |
#is_op_return? ⇒ Boolean
is this an op_return script
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# File 'lib/bitcoin/script.rb', line 568 def is_op_return? @chunks[0] == OP_RETURN && @chunks.size <= 2 end |
#is_pay_to_script_hash? ⇒ Boolean Also known as: is_p2sh?
is this a :script_hash (pay-to-script-hash/p2sh) script?
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# File 'lib/bitcoin/script.rb', line 522 def is_pay_to_script_hash? return false if @inner_p2sh if @previous_output_script chunks = Bitcoin::Script.new(@previous_output_script).chunks chunks.size == 3 && chunks[-3] == OP_HASH160 && chunks[-2].is_a?(String) && chunks[-2].bytesize == 20 && chunks[-1] == OP_EQUAL else @chunks.size >= 3 && @chunks[-3] == OP_HASH160 && @chunks[-2].is_a?(String) && @chunks[-2].bytesize == 20 && @chunks[-1] == OP_EQUAL && # make sure the script_sig matches the p2sh hash from the pk_script (if there is one) (@chunks.size > 3 ? pay_to_script_hash(nil, nil, :check) : true) end end |
#is_pubkey? ⇒ Boolean Also known as: is_send_to_ip?
is this a pubkey script
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# File 'lib/bitcoin/script.rb', line 547 def is_pubkey? return false if @chunks.size != 2 (@chunks[1] == OP_CHECKSIG) && @chunks[0] && (@chunks[0].is_a?(String)) && @chunks[0] != OP_RETURN end |
#is_push_only?(script_data = nil) ⇒ Boolean
Verify the script is only pushing data onto the stack
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# File 'lib/bitcoin/script.rb', line 573 def is_push_only?(script_data=nil) check_pushes(push_only=true, canonical_only=false, (script_data||@input_script)) end |
#is_standard? ⇒ Boolean
check if script is in one of the recognized standard formats
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# File 'lib/bitcoin/script.rb', line 542 def is_standard? is_pubkey? || is_hash160? || is_multisig? || is_p2sh? || is_op_return? end |
#op_0 ⇒ Object
An empty array of bytes is pushed onto the stack.
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# File 'lib/bitcoin/script.rb', line 1094 def op_0 @stack << "" # [] end |
#op_0notequal ⇒ Object
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# File 'lib/bitcoin/script.rb', line 1025 def op_0notequal a = pop_int @stack << (a != 0 ? 1 : 0) end |
#op_1 ⇒ Object
The number 1 is pushed onto the stack. Same as OP_TRUE
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# File 'lib/bitcoin/script.rb', line 1099 def op_1 @stack << 1 end |
#op_1add ⇒ Object
1 is added to the input.
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# File 'lib/bitcoin/script.rb', line 1049 def op_1add a = pop_int @stack << (a + 1) end |
#op_1negate ⇒ Object
The number -1 is pushed onto the stack.
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# File 'lib/bitcoin/script.rb', line 1134 def op_1negate @stack << -1 end |
#op_1sub ⇒ Object
1 is subtracted from the input.
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# File 'lib/bitcoin/script.rb', line 1055 def op_1sub a = pop_int @stack << (a - 1) end |
#op_2div ⇒ Object
The input is divided by 2. Currently disabled.
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# File 'lib/bitcoin/script.rb', line 1037 def op_2div a = pop_int @stack << (a >> 1) end |
#op_2drop ⇒ Object
Removes the top two stack items.
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# File 'lib/bitcoin/script.rb', line 1239 def op_2drop @stack.pop(2) end |
#op_2dup ⇒ Object
Duplicates the top two stack items.
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# File 'lib/bitcoin/script.rb', line 1244 def op_2dup @stack.push(*@stack[-2..-1]) end |
#op_2mul ⇒ Object
The input is multiplied by 2. Currently disabled.
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# File 'lib/bitcoin/script.rb', line 1043 def op_2mul a = pop_int @stack << (a << 1) end |
#op_2over ⇒ Object
Copies the pair of items two spaces back in the stack to the front.
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# File 'lib/bitcoin/script.rb', line 1114 def op_2over @stack << @stack[-4] @stack << @stack[-4] end |
#op_2rot ⇒ Object
The fifth and sixth items back are moved to the top of the stack.
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# File 'lib/bitcoin/script.rb', line 1214 def op_2rot return invalid if @stack.size < 6 @stack[-6..-1] = [ *@stack[-4..-1], *@stack[-6..-5] ] end |
#op_2swap ⇒ Object
Swaps the top two pairs of items.
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# File 'lib/bitcoin/script.rb', line 1120 def op_2swap p1 = @stack.pop(2) p2 = @stack.pop(2) @stack += p1 += p2 end |
#op_3dup ⇒ Object
Duplicates the top three stack items.
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# File 'lib/bitcoin/script.rb', line 1249 def op_3dup @stack.push(*@stack[-3..-1]) end |
#op_abs ⇒ Object
The input is made positive.
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# File 'lib/bitcoin/script.rb', line 1031 def op_abs a = pop_int @stack << a.abs end |
#op_add ⇒ Object
a is added to b.
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# File 'lib/bitcoin/script.rb', line 984 def op_add a, b = pop_int(2) @stack << a + b end |
#op_booland ⇒ Object
If both a and b are not 0, the output is 1. Otherwise 0.
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# File 'lib/bitcoin/script.rb', line 972 def op_booland a, b = pop_int(2) @stack << (![a,b].any?{|n| n == 0 } ? 1 : 0) end |
#op_boolor ⇒ Object
If a or b is not 0, the output is 1. Otherwise 0.
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# File 'lib/bitcoin/script.rb', line 978 def op_boolor a, b = pop_int(2) @stack << ( (a != 0 || b != 0) ? 1 : 0 ) end |
#op_checkmultisig(check_callback, opts = {}) ⇒ Object
do a CHECKMULTISIG operation on the current stack, asking check_callback
to do the actual signature verification.
CHECKMULTISIG does a m-of-n signatures verification on scripts of the form:
0 <sig1> <sig2> | 2 <pub1> <pub2> 2 OP_CHECKMULTISIG
0 <sig1> <sig2> | 2 <pub1> <pub2> <pub3> 3 OP_CHECKMULTISIG
0 <sig1> <sig2> <sig3> | 3 <pub1> <pub2> <pub3> 3 OP_CHECKMULTISIG
see en.bitcoin.it/wiki/BIP_0011 for details. see github.com/bitcoin/bitcoin/blob/master/src/script.cpp#L931
TODO: validate signature order TODO: take global opcode count
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# File 'lib/bitcoin/script.rb', line 1393 def op_checkmultisig(check_callback, opts={}) return invalid if @stack.size < 1 n_pubkeys = pop_int return invalid unless (0..20).include?(n_pubkeys) #return invalid if (nOpCount += n_pubkeys) > 201 return invalid if @stack.size < n_pubkeys pubkeys = pop_string(n_pubkeys) return invalid if @stack.size < 1 n_sigs = pop_int return invalid if n_sigs < 0 || n_sigs > n_pubkeys return invalid if @stack.size < n_sigs sigs = pop_string(n_sigs) drop_sigs = sigs.dup # Bitcoin-core removes an extra item from the stack @stack.pop subscript = sighash_subscript(drop_sigs) success = true while success && n_sigs > 0 sig, pub = sigs.pop, pubkeys.pop return (@stack << 0) unless Bitcoin::Script.check_pubkey_encoding?(pub, opts) return invalid unless Bitcoin::Script.check_signature_encoding?(sig, opts) unless sig && sig.size > 0 success = false break end signature, hash_type = parse_sig(sig) if pub.size > 0 && check_callback.call(pub, signature, hash_type, subscript) n_sigs -= 1 else sigs << sig end n_pubkeys -= 1 success = false if n_sigs > n_pubkeys end @stack << (success ? 1 : 0) end |
#op_checkmultisigverify(check_callback, opts = {}) ⇒ Object
Same as OP_CHECKMULTISIG, but OP_VERIFY is executed afterward.
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# File 'lib/bitcoin/script.rb', line 1436 def op_checkmultisigverify(check_callback, opts={}) op_checkmultisig(check_callback, opts) op_verify end |
#op_checksig(check_callback, opts = {}) ⇒ Object
do a CHECKSIG operation on the current stack, asking check_callback
to do the actual signature verification. This is used by Protocol::Tx#verify_input_signature
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# File 'lib/bitcoin/script.rb', line 1344 def op_checksig(check_callback, opts={}) return invalid if @stack.size < 2 pubkey = cast_to_string(@stack.pop) return (@stack << 0) unless Bitcoin::Script.check_pubkey_encoding?(pubkey, opts) drop_sigs = [ cast_to_string(@stack[-1]) ] signature = cast_to_string(@stack.pop) return invalid unless Bitcoin::Script.check_signature_encoding?(signature, opts) return (@stack << 0) if signature == "" sig, hash_type = parse_sig(signature) subscript = sighash_subscript(drop_sigs) if check_callback == nil # for tests @stack << 1 else # real signature check callback @stack << ((check_callback.call(pubkey, sig, hash_type, subscript) == true) ? 1 : 0) end end |
#op_checksigverify(check_callback, opts = {}) ⇒ Object
Same as OP_CHECKSIG, but OP_VERIFY is executed afterward.
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# File 'lib/bitcoin/script.rb', line 1375 def op_checksigverify(check_callback, opts={}) op_checksig(check_callback, opts) op_verify end |
#op_codeseparator ⇒ Object
All of the signature checking words will only match signatures to the data after the most recently-executed OP_CODESEPARATOR.
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# File 'lib/bitcoin/script.rb', line 1328 def op_codeseparator @codehash_start = @chunks.size - @chunks.reverse.index(OP_CODESEPARATOR) @last_codeseparator_index = @chunk_last_index end |
#op_depth ⇒ Object
Puts the number of stack items onto the stack.
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# File 'lib/bitcoin/script.rb', line 1139 def op_depth @stack << @stack.size end |
#op_drop ⇒ Object
Removes the top stack item.
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# File 'lib/bitcoin/script.rb', line 1067 def op_drop @stack.pop end |
#op_dup ⇒ Object
Duplicates the top stack item.
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# File 'lib/bitcoin/script.rb', line 917 def op_dup @stack << (@stack[-1].dup rescue @stack[-1]) end |
#op_else ⇒ Object
If the preceding OP_IF or OP_NOTIF or OP_ELSE was not executed then these statements are and if the preceding OP_IF or OP_NOTIF or OP_ELSE was executed then these statements are not.
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# File 'lib/bitcoin/script.rb', line 1193 def op_else return if @exec_stack.empty? @exec_stack[-1] = !@exec_stack[-1] end |
#op_endif ⇒ Object
Ends an if/else block.
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# File 'lib/bitcoin/script.rb', line 1199 def op_endif return if @exec_stack.empty? @exec_stack.pop end |
#op_equal ⇒ Object
Returns 1 if the inputs are exactly equal, 0 otherwise.
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# File 'lib/bitcoin/script.rb', line 1072 def op_equal a, b = pop_string(2) @stack << (a == b ? 1 : 0) end |
#op_equalverify ⇒ Object
Same as OP_EQUAL, but runs OP_VERIFY afterward.
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# File 'lib/bitcoin/script.rb', line 1089 def op_equalverify op_equal; op_verify end |
#op_fromaltstack ⇒ Object
Puts the input onto the top of the main stack. Removes it from the alt stack.
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# File 'lib/bitcoin/script.rb', line 957 def op_fromaltstack @stack << @stack_alt.pop end |
#op_greaterthan ⇒ Object
Returns 1 if a is greater than b, 0 otherwise.
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# File 'lib/bitcoin/script.rb', line 1008 def op_greaterthan a, b = pop_int(2) @stack << (a > b ? 1 : 0) end |
#op_greaterthanorequal ⇒ Object
Returns 1 if a is greater than or equal to b, 0 otherwise.
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# File 'lib/bitcoin/script.rb', line 1014 def op_greaterthanorequal a, b = pop_int(2) @stack << (a >= b ? 1 : 0) end |
#op_hash160 ⇒ Object
The input is hashed twice: first with SHA-256 and then with RIPEMD-160.
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# File 'lib/bitcoin/script.rb', line 934 def op_hash160 buf = pop_string @stack << Digest::RMD160.digest(Digest::SHA256.digest(buf)) end |
#op_hash256 ⇒ Object
The input is hashed two times with SHA-256.
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# File 'lib/bitcoin/script.rb', line 946 def op_hash256 buf = pop_string @stack << Digest::SHA256.digest(Digest::SHA256.digest(buf)) end |
#op_if ⇒ Object
If the top stack value is not 0, the statements are executed. The top stack value is removed.
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# File 'lib/bitcoin/script.rb', line 1173 def op_if value = false if @do_exec (invalid; return) if @stack.size < 1 value = cast_to_bool(pop_string) == false ? false : true end @exec_stack << value end |
#op_ifdup ⇒ Object
If the input is true, duplicate it.
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# File 'lib/bitcoin/script.rb', line 1127 def op_ifdup if cast_to_bool(@stack.last) == true @stack << @stack.last end end |
#op_lessthan ⇒ Object
Returns 1 if a is less than b, 0 otherwise.
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# File 'lib/bitcoin/script.rb', line 996 def op_lessthan a, b = pop_int(2) @stack << (a < b ? 1 : 0) end |
#op_lessthanorequal ⇒ Object
Returns 1 if a is less than or equal to b, 0 otherwise.
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# File 'lib/bitcoin/script.rb', line 1002 def op_lessthanorequal a, b = pop_int(2) @stack << (a <= b ? 1 : 0) end |
#op_max ⇒ Object
Returns the larger of a and b.
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# File 'lib/bitcoin/script.rb', line 1109 def op_max @stack << pop_int(2).max end |
#op_min ⇒ Object
Returns the smaller of a and b.
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# File 'lib/bitcoin/script.rb', line 1104 def op_min @stack << pop_int(2).min end |
#op_negate ⇒ Object
The sign of the input is flipped.
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# File 'lib/bitcoin/script.rb', line 1061 def op_negate a = pop_int @stack << -a end |
#op_nip ⇒ Object
Removes the second-to-top stack item.
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# File 'lib/bitcoin/script.rb', line 1254 def op_nip @stack.delete_at(-2) end |
#op_nop ⇒ Object
Does nothing
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# File 'lib/bitcoin/script.rb', line 904 def op_nop; end |
#op_nop1 ⇒ Object
op_eval: en.bitcoin.it/wiki/BIP_0012
the BIP was never accepted and must be handled as old OP_NOP1
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# File 'lib/bitcoin/script.rb', line 1443 def op_nop1; end |
#op_nop10 ⇒ Object
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# File 'lib/bitcoin/script.rb', line 914 def op_nop10; end |
#op_nop2 ⇒ Object
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# File 'lib/bitcoin/script.rb', line 906 def op_nop2; end |
#op_nop3 ⇒ Object
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# File 'lib/bitcoin/script.rb', line 907 def op_nop3; end |
#op_nop4 ⇒ Object
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# File 'lib/bitcoin/script.rb', line 908 def op_nop4; end |
#op_nop5 ⇒ Object
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# File 'lib/bitcoin/script.rb', line 909 def op_nop5; end |
#op_nop6 ⇒ Object
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# File 'lib/bitcoin/script.rb', line 910 def op_nop6; end |
#op_nop7 ⇒ Object
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# File 'lib/bitcoin/script.rb', line 911 def op_nop7; end |
#op_nop8 ⇒ Object
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# File 'lib/bitcoin/script.rb', line 912 def op_nop8; end |
#op_nop9 ⇒ Object
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# File 'lib/bitcoin/script.rb', line 913 def op_nop9; end |
#op_not ⇒ Object
If the input is 0 or 1, it is flipped. Otherwise the output will be 0.
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# File 'lib/bitcoin/script.rb', line 1020 def op_not a = pop_int @stack << (a == 0 ? 1 : 0) end |
#op_notif ⇒ Object
If the top stack value is 0, the statements are executed. The top stack value is removed.
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# File 'lib/bitcoin/script.rb', line 1183 def op_notif value = false if @do_exec (invalid; return) if @stack.size < 1 value = cast_to_bool(pop_string) == false ? true : false end @exec_stack << value end |
#op_numequal ⇒ Object
Returns 1 if the numbers are equal, 0 otherwise.
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# File 'lib/bitcoin/script.rb', line 1150 def op_numequal a, b = pop_int(2) @stack << (a == b ? 1 : 0) end |
#op_numequalverify ⇒ Object
Same as OP_NUMEQUAL, but runs OP_VERIFY afterward.
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# File 'lib/bitcoin/script.rb', line 1322 def op_numequalverify op_numequal; op_verify end |
#op_numnotequal ⇒ Object
Returns 1 if the numbers are not equal, 0 otherwise.
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# File 'lib/bitcoin/script.rb', line 1156 def op_numnotequal a, b = pop_int(2) @stack << (a != b ? 1 : 0) end |
#op_over ⇒ Object
Copies the second-to-top stack item to the top.
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# File 'lib/bitcoin/script.rb', line 1167 def op_over item = @stack[-2] @stack << item if item end |
#op_pick ⇒ Object
The item n back in the stack is copied to the top.
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# File 'lib/bitcoin/script.rb', line 1205 def op_pick return invalid if @stack.size < 2 pos = pop_int return invalid if (pos < 0) || (pos >= @stack.size) item = @stack[-(pos+1)] @stack << item if item end |
#op_return ⇒ Object
Marks transaction as invalid.
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# File 'lib/bitcoin/script.rb', line 1162 def op_return @script_invalid = true; nil end |
#op_ripemd160 ⇒ Object
The input is hashed using RIPEMD-160.
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# File 'lib/bitcoin/script.rb', line 940 def op_ripemd160 buf = pop_string @stack << Digest::RMD160.digest(buf) end |
#op_roll ⇒ Object
The item n back in the stack is moved to the top.
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# File 'lib/bitcoin/script.rb', line 1220 def op_roll return invalid if @stack.size < 2 pos = pop_int return invalid if (pos < 0) || (pos >= @stack.size) idx = -(pos+1) item = @stack[idx] if item @stack.delete_at(idx) @stack << item if item end end |
#op_rot ⇒ Object
The top three items on the stack are rotated to the left.
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# File 'lib/bitcoin/script.rb', line 1233 def op_rot return if @stack.size < 3 @stack[-3..-1] = [ @stack[-2], @stack[-1], @stack[-3] ] end |
#op_sha1 ⇒ Object
The input is hashed using SHA-1.
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# File 'lib/bitcoin/script.rb', line 928 def op_sha1 buf = pop_string @stack << Digest::SHA1.digest(buf) end |
#op_sha256 ⇒ Object
The input is hashed using SHA-256.
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# File 'lib/bitcoin/script.rb', line 922 def op_sha256 buf = pop_string @stack << Digest::SHA256.digest(buf) end |
#op_size ⇒ Object
Returns the length of the input string.
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# File 'lib/bitcoin/script.rb', line 1259 def op_size item = @stack[-1] size = case item when String; item.bytesize when Numeric; OpenSSL::BN.new(item.to_s).to_mpi.size - 4 end @stack << size end |
#op_sub ⇒ Object
b is subtracted from a.
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# File 'lib/bitcoin/script.rb', line 990 def op_sub a, b = pop_int(2) @stack << a - b end |
#op_swap ⇒ Object
The top two items on the stack are swapped.
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# File 'lib/bitcoin/script.rb', line 967 def op_swap @stack[-2..-1] = @stack[-2..-1].reverse if @stack[-2] end |
#op_toaltstack ⇒ Object
Puts the input onto the top of the alt stack. Removes it from the main stack.
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# File 'lib/bitcoin/script.rb', line 952 def op_toaltstack @stack_alt << @stack.pop end |
#op_tuck ⇒ Object
The item at the top of the stack is copied and inserted before the second-to-top item.
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# File 'lib/bitcoin/script.rb', line 962 def op_tuck @stack[-2..-1] = [ @stack[-1], *@stack[-2..-1] ] end |
#op_ver ⇒ Object
Transaction is invalid unless occuring in an unexecuted OP_IF branch
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# File 'lib/bitcoin/script.rb', line 1269 def op_ver invalid if @do_exec end |
#op_verify ⇒ Object
Marks transaction as invalid if top stack value is not true. True is removed, but false is not.
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# File 'lib/bitcoin/script.rb', line 1078 def op_verify res = pop_int if cast_to_bool(res) == false @stack << res @script_invalid = true # raise 'transaction invalid' ? else @script_invalid = false end end |
#op_within ⇒ Object
Returns 1 if x is within the specified range (left-inclusive), 0 otherwise.
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# File 'lib/bitcoin/script.rb', line 1144 def op_within bn1, bn2, bn3 = pop_int(3) @stack << ( (bn2 <= bn1 && bn1 < bn3) ? 1 : 0 ) end |
#parse(bytes, offset = 0) ⇒ Object
parse raw script
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# File 'lib/bitcoin/script.rb', line 187 def parse(bytes, offset=0) program = bytes.unpack("C*") chunks = [] until program.empty? opcode = program.shift if (opcode > 0) && (opcode < OP_PUSHDATA1) len, tmp = opcode, program[0] chunks << program.shift(len).pack("C*") # 0x16 = 22 due to OP_2_16 from_string parsing if len == 1 && tmp && tmp <= 22 chunks.last.bitcoin_pushdata = OP_PUSHDATA0 chunks.last.bitcoin_pushdata_length = len else raise "invalid OP_PUSHDATA0" if len != chunks.last.bytesize end elsif (opcode == OP_PUSHDATA1) len = program.shift(1)[0] chunks << program.shift(len).pack("C*") unless len > OP_PUSHDATA1 && len <= 0xff chunks.last.bitcoin_pushdata = OP_PUSHDATA1 chunks.last.bitcoin_pushdata_length = len else raise "invalid OP_PUSHDATA1" if len != chunks.last.bytesize end elsif (opcode == OP_PUSHDATA2) len = program.shift(2).pack("C*").unpack("v")[0] chunks << program.shift(len).pack("C*") unless len > 0xff && len <= 0xffff chunks.last.bitcoin_pushdata = OP_PUSHDATA2 chunks.last.bitcoin_pushdata_length = len else raise "invalid OP_PUSHDATA2" if len != chunks.last.bytesize end elsif (opcode == OP_PUSHDATA4) len = program.shift(4).pack("C*").unpack("V")[0] chunks << program.shift(len).pack("C*") unless len > 0xffff # && len <= 0xffffffff chunks.last.bitcoin_pushdata = OP_PUSHDATA4 chunks.last.bitcoin_pushdata_length = len else raise "invalid OP_PUSHDATA4" if len != chunks.last.bytesize end else chunks << opcode end end chunks rescue => ex # bail out! #run returns false but serialization roundtrips still create the right payload. chunks.pop if ex..include?("invalid OP_PUSHDATA") @parse_invalid = true c = bytes.unpack("C*").pack("C*") c.bitcoin_pushdata = OP_PUSHDATA_INVALID c.bitcoin_pushdata_length = c.bytesize chunks << c end |
#pay_to_script_hash(block_timestamp, opts, check_callback) ⇒ Object
pay_to_script_hash: en.bitcoin.it/wiki/BIP_0016
<sig> OP_CHECKSIG | OP_HASH160 <script_hash> OP_EQUAL
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# File 'lib/bitcoin/script.rb', line 491 def pay_to_script_hash(, opts, check_callback) return false if @chunks.size < 4 *rest, script, _, script_hash, _ = @chunks script = rest.pop if script == OP_CODESEPARATOR script, script_hash = cast_to_string(script), cast_to_string(script_hash) return false unless Bitcoin.hash160(script.unpack("H*")[0]) == script_hash.unpack("H*")[0] return true if check_callback == :check script = self.class.new(to_binary(rest) + script).inner_p2sh!(script) result = script.run(, opts, &check_callback) @debug = script.debug @stack = script.stack # Set the execution stack to match the redeem script, so checks on stack contents at end of script execution validate correctly result end |
#pop_int(count = nil) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 1273 def pop_int(count=nil) return cast_to_bignum(@stack.pop) unless count @stack.pop(count).map{|i| cast_to_bignum(i) } end |
#pop_string(count = nil) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 1278 def pop_string(count=nil) return cast_to_string(@stack.pop) unless count @stack.pop(count).map{|i| cast_to_string(i) } end |
#pushes_are_canonical?(script_data = nil) ⇒ Boolean
Make sure opcodes used to push data match their intended length ranges
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# File 'lib/bitcoin/script.rb', line 578 def pushes_are_canonical?(script_data=nil) check_pushes(push_only=false, canonical_only=true, (script_data||@raw)) end |
#run(block_timestamp = Time.now.to_i, opts = {}, &check_callback) ⇒ Object
run the script. check_callback
is called for OP_CHECKSIG operations
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# File 'lib/bitcoin/script.rb', line 404 def run(=Time.now.to_i, opts={}, &check_callback) return false if @parse_invalid #p [to_string, block_timestamp, is_p2sh?] @script_invalid = true if @raw_byte_sizes.any?{|size| size > 10_000 } @last_codeseparator_index = 0 if >= 1333238400 # Pay to Script Hash (BIP 0016) return pay_to_script_hash(, opts, check_callback) if is_p2sh? end @debug = [] @chunks.each.with_index{|chunk,idx| break if invalid? @chunk_last_index = idx @debug << @stack.map{|i| i.unpack("H*") rescue i} @do_exec = @exec_stack.count(false) == 0 ? true : false #p [@stack, @do_exec] case chunk when Fixnum if DISABLED_OPCODES.include?(chunk) @script_invalid = true @debug << "DISABLED_#{OPCODES[chunk]}" break end next @debug.pop unless (@do_exec || (OP_IF <= chunk && chunk <= OP_ENDIF)) case chunk when *OPCODES_METHOD.keys m = method( n=OPCODES_METHOD[chunk] ) @debug << n.to_s.upcase # invoke opcode method case m.arity when 0 m.call when 1 m.call(check_callback) when -2 # One fixed parameter, one optional m.call(check_callback, opts) else puts "Bitcoin::Script: opcode #{name} method parameters invalid" end when *OP_2_16 @stack << OP_2_16.index(chunk) + 2 @debug << "OP_#{chunk-80}" else name = OPCODES[chunk] || chunk puts "Bitcoin::Script: opcode #{name} unkown or not implemented\n#{to_string.inspect}" raise "opcode #{name} unkown or not implemented" end when String if @do_exec @debug << "PUSH DATA #{chunk.unpack("H*")[0]}" @stack << chunk else @debug.pop end end } @debug << @stack.map{|i| i.unpack("H*") rescue i } #if @do_exec if @script_invalid @stack << 0 @debug << "INVALID TRANSACTION" end @debug << "RESULT" return false if @stack.empty? return false if cast_to_bool(@stack.pop) == false true end |
#sighash_subscript(drop_sigs) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 1366 def sighash_subscript(drop_sigs) if inner_p2sh? && @inner_script_code ::Bitcoin::Script.new(@inner_script_code).to_binary_without_signatures(drop_sigs) else to_binary_without_signatures(drop_sigs) end end |
#sigops_count_accurate(is_accurate) ⇒ Object
This matches CScript::GetSigOpCount(bool fAccurate) Note: this does not cover P2SH script which is to be unserialized
and checked explicitly when validating blocks.
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# File 'lib/bitcoin/script.rb', line 838 def sigops_count_accurate(is_accurate) count = 0 last_opcode = nil @chunks.each do |chunk| # pushdate or opcode if chunk == OP_CHECKSIG || chunk == OP_CHECKSIGVERIFY count += 1 elsif chunk == OP_CHECKMULTISIG || chunk == OP_CHECKMULTISIGVERIFY # Accurate mode counts exact number of pubkeys required (not signatures, but pubkeys!). Only used in P2SH scripts. # Inaccurate mode counts every multisig as 20 signatures. if is_accurate && last_opcode && last_opcode.is_a?(Fixnum) && last_opcode >= OP_1 && last_opcode <= OP_16 count += ::Bitcoin::Script.decode_OP_N(last_opcode) else count += 20 end end last_opcode = chunk end count end |
#sigops_count_for_p2sh ⇒ Object
This method applies to script_sig that is an input for p2sh output. Bitcoind has somewhat special way to return count for invalid input scripts: it returns 0 when the opcode can’t be parsed or when it’s over OP_16. Also, if the OP_N is used anywhere it’s treated as 0-length data. See CScript::GetSigOpCount(const CScript& scriptSig) in bitcoind.
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# File 'lib/bitcoin/script.rb', line 863 def sigops_count_for_p2sh # This is a pay-to-script-hash scriptPubKey; # get the last item that the scriptSig # pushes onto the stack: return 0 if @chunks.size == 0 data = nil @chunks.each do |chunk| case chunk when Fixnum data = "" return 0 if chunk > OP_16 when String data = chunk end end return 0 if data == "" ::Bitcoin::Script.new(data).sigops_count_accurate(true) end |
#to_binary(chunks = nil) ⇒ Object Also known as: to_payload
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# File 'lib/bitcoin/script.rb', line 272 def to_binary(chunks=nil) (chunks || @chunks).map{|chunk| case chunk when Fixnum; [chunk].pack("C*") when String; self.class.pack_pushdata(chunk) end }.join end |
#to_binary_without_signatures(drop_signatures, chunks = nil) ⇒ Object
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# File 'lib/bitcoin/script.rb', line 282 def to_binary_without_signatures(drop_signatures, chunks=nil) buf = [] (chunks || @chunks).each.with_index{|chunk,idx| if chunk == OP_CODESEPARATOR and idx <= @last_codeseparator_index buf.clear elsif chunk == OP_CODESEPARATOR if idx == @script_codeseparator_index break else # skip end elsif drop_signatures.none?{|e| e == chunk } buf << chunk end } to_binary(buf) end |
#to_string(chunks = nil) ⇒ Object
string representation of the script
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# File 'lib/bitcoin/script.rb', line 250 def to_string(chunks=nil) string = "" (chunks || @chunks).each.with_index{|i,idx| string << " " unless idx == 0 string << case i when Fixnum if opcode = OPCODES_PARSE_BINARY[i] opcode else "(opcode-#{i})" end when String if i.bitcoin_pushdata "#{i.bitcoin_pushdata}:#{i.bitcoin_pushdata_length}:".force_encoding('binary') + i.unpack("H*")[0] else i.unpack("H*")[0] end end } string end |
#type ⇒ Object
get type of this tx
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# File 'lib/bitcoin/script.rb', line 621 def type if is_hash160?; :hash160 elsif is_pubkey?; :pubkey elsif is_multisig?; :multisig elsif is_p2sh?; :p2sh elsif is_op_return?;:op_return else; :unknown end end |