Class: RubyHome::HAP::Decrypter
- Inherits:
-
Object
- Object
- RubyHome::HAP::Decrypter
- Defined in:
- lib/ruby_home/hap/decrypter.rb
Constant Summary collapse
- AAD_LENGTH_BYTES =
2.freeze
- AUTHENTICATE_TAG_LENGTH_BYTES =
16.freeze
- NONCE_32_BIT_FIX_COMMENT_PART =
[0].pack('L').freeze
Instance Attribute Summary collapse
-
#count ⇒ Object
readonly
Returns the value of attribute count.
Instance Method Summary collapse
- #decrypt(data) ⇒ Object
-
#initialize(key, count: 0) ⇒ Decrypter
constructor
A new instance of Decrypter.
Constructor Details
#initialize(key, count: 0) ⇒ Decrypter
Returns a new instance of Decrypter.
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# File 'lib/ruby_home/hap/decrypter.rb', line 8 def initialize(key, count: 0) @key = key @count = count end |
Instance Attribute Details
#count ⇒ Object (readonly)
Returns the value of attribute count.
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# File 'lib/ruby_home/hap/decrypter.rb', line 38 def count @count end |
Instance Method Details
#decrypt(data) ⇒ Object
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# File 'lib/ruby_home/hap/decrypter.rb', line 13 def decrypt(data) decrypted_data = [] read_pointer = 0 while read_pointer < data.length little_endian_length_of_encrypted_data = data[read_pointer...read_pointer+AAD_LENGTH_BYTES] length_of_encrypted_data = little_endian_length_of_encrypted_data.unpack1('v') read_pointer += AAD_LENGTH_BYTES = data[read_pointer...read_pointer+length_of_encrypted_data] read_pointer += length_of_encrypted_data auth_tag = data[read_pointer...read_pointer+AUTHENTICATE_TAG_LENGTH_BYTES] read_pointer += AUTHENTICATE_TAG_LENGTH_BYTES ciphertext = + auth_tag additional_data = little_endian_length_of_encrypted_data decrypted_data << chacha20poly1305ietf.decrypt(nonce, ciphertext, additional_data) increment_count! end decrypted_data.join end |