Module: ECDSA::Format::SignatureDerString

Defined in:
lib/ecdsa/format/signature_der_string.rb

Overview

This module provides methods to convert between Signature objects and their binary DER representation. The format used is defined in RFC 3278 section 8.2.

Class Method Summary collapse

Class Method Details

.decode(der_string) ⇒ Signature

Converts a DER string to a Signature.

Parameters:

  • der_string (String)

Returns:



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# File 'lib/ecdsa/format/signature_der_string.rb', line 13

def self.decode(der_string)
  asn1 = OpenSSL::ASN1.decode(der_string)
  r = asn1.value[0].value.to_i
  s = asn1.value[1].value.to_i
  Signature.new(r, s)
end

.encode(signature) ⇒ String

Converts a Signature to a DER string.

Parameters:

Returns:

  • (String) 


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# File 'lib/ecdsa/format/signature_der_string.rb', line 23

def self.encode(signature)
  asn1 = OpenSSL::ASN1::Sequence.new [
    OpenSSL::ASN1::Integer.new(signature.r),
    OpenSSL::ASN1::Integer.new(signature.s),
  ]
  asn1.to_der
end