Module: Ethereum::Secp256k1

Defined in:
lib/ethereum/secp256k1.rb

Defined Under Namespace

Classes: InvalidPrivateKey

Constant Summary collapse

P =

Elliptic curve parameters

2**256 - 2**32 - 977
N = 
115792089237316195423570985008687907852837564279074904382605163141518161494337
A = 
0
B = 
7
Gx = 
55066263022277343669578718895168534326250603453777594175500187360389116729240
Gy = 
32670510020758816978083085130507043184471273380659243275938904335757337482424
G = 
[Gx, Gy].freeze

Class Method Summary collapse

Class Method Details

.priv_to_pub(priv) ⇒ Object 



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# File 'lib/ethereum/secp256k1.rb', line 21

def priv_to_pub(priv)
  priv = PrivateKey.new(priv)
  privkey = ::Secp256k1::PrivateKey.new privkey: priv.encode(:bin), raw: true
  pubkey = privkey.pubkey
  PublicKey.new(pubkey.serialize).encode(priv.format)
end

.recover_pubkey(msg, vrs, compressed: false) ⇒ Object 



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# File 'lib/ethereum/secp256k1.rb', line 49

def recover_pubkey(msg, vrs, compressed: false)
  pk = ::Secp256k1::PublicKey.new(flags: ::Secp256k1::ALL_FLAGS)
  sig = Utils.zpad_int(vrs[1]) + Utils.zpad_int(vrs[2])
  recsig = pk.ecdsa_recoverable_deserialize(sig, vrs[0]-27)
  pk.public_key = pk.ecdsa_recover msg, recsig, raw: true
  pk.serialize compressed: compressed
end

.recoverable_sign(msg, privkey) ⇒ Object 



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# File 'lib/ethereum/secp256k1.rb', line 28

def recoverable_sign(msg, privkey)
  pk = ::Secp256k1::PrivateKey.new privkey: privkey, raw: true
  signature = pk.ecdsa_recoverable_serialize pk.ecdsa_sign_recoverable(msg, raw: true)

  v = signature[1] + 27
  r = Utils.big_endian_to_int signature[0][0,32]
  s = Utils.big_endian_to_int signature[0][32,32]

  [v,r,s]
end

.signature_verify(msg, vrs, pubkey) ⇒ Object 



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# File 'lib/ethereum/secp256k1.rb', line 39

def signature_verify(msg, vrs, pubkey)
  pk = ::Secp256k1::PublicKey.new(pubkey: pubkey)
  raw_sig = Utils.zpad_int(vrs[1]) + Utils.zpad_int(vrs[2])

  sig = ::Secp256k1::C::ECDSASignature.new
  sig[:data].to_ptr.write_bytes(raw_sig)

  pk.ecdsa_verify(msg, sig)
end