Method: FROST::Signature.decode

Defined in:
lib/frost/signature.rb

.decode(context, hex_value) ⇒ FROST::Signature

Decode hex value to FROST::Signature.

Parameters:

  • context (FROST::Context)
  • hex_value (String) —

    Hex value of signature.

Returns:

Raises:

  • (ArgumentError) 


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# File 'lib/frost/signature.rb', line 45

def self.decode(context, hex_value)
  raise ArgumentError, "context must be FROST::Context" unless context.is_a?(FROST::Context)
  raise ArgumentError, "hex value must be String" unless hex_value.is_a?(String)

  data = [hex_value].pack("H*")
  data = [0x02].pack('C') + data if context.taproot?
  len = context.group.byte_length + 1

  r = ECDSA::Format::PointOctetString.decode(data[0...len], context.group)
  s = ECDSA::Format::IntegerOctetString.decode(data[len..-1])
  Signature.new(context, r, s)
end