Method: Themis.s_sign

Defined in:
lib/rbthemis.rb

.s_sign(private_key, message) ⇒ Object 



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# File 'lib/rbthemis.rb', line 478

def s_sign(private_key, message)
  if not valid_key(private_key)
    raise ThemisError, "Secure Message: invalid private key"
  end
  if not private_key(private_key)
    raise ThemisError, "Secure Message: public key used instead of private"
  end

  private_key_, private_key_length_ = string_to_pointer_size(private_key)
  message_, message_length_ = string_to_pointer_size(message)

  wrapped_message_length = FFI::MemoryPointer.new(:uint)
  res = themis_secure_message_sign(
    private_key_, private_key_length_, message_,
    message_length_, nil, wrapped_message_length)
  if res != BUFFER_TOO_SMALL
    raise ThemisError, "Secure Message failed to sign: #{res}"
  end

  wrapped_message = FFI::MemoryPointer.new(
    :char, wrapped_message_length.read_uint)
  res = themis_secure_message_sign(
    private_key_, private_key_length_, message_,
    message_length_, wrapped_message, wrapped_message_length)
  if res != SUCCESS
    raise ThemisError, "Secure Message failed to sign: #{res}"
  end

  wrapped_message.get_bytes(0, wrapped_message_length.read_uint)
end