Method: Themis.s_verify

Defined in:

lib/rbthemis.rb

.s_verify(peer_public_key, message) ⇒ Object

# File 'lib/rbthemis.rb', line 514

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

  public_key_, public_key_length_ = string_to_pointer_size(peer_public_key)
  message_, message_length_ = string_to_pointer_size(message)

  unwrapped_message_length = FFI::MemoryPointer.new(:uint)
  res = themis_secure_message_verify(
    public_key_, public_key_length_, message_,
    message_length_, nil, unwrapped_message_length)
  if res != BUFFER_TOO_SMALL
    raise ThemisError, "Secure Message failed to verify: #{res}"
  end

  unwrapped_message = FFI::MemoryPointer.new(
    :char, unwrapped_message_length.read_uint)
  res = themis_secure_message_verify(
    public_key_, public_key_length_, message_,
    message_length_, unwrapped_message, unwrapped_message_length)
  if res != SUCCESS
    raise ThemisError, "Secure Message failed to verify: #{res}"
  end

  unwrapped_message.get_bytes(0, unwrapped_message_length.read_uint)
end