Shawn Willden edited this page Mar 7, 2015 · 1 revision

Attached Signing with Keyczar

Generate digest signature of a message and attaches to the message. Used for Signed Sessions. In format, Header.len(Message).Message.Sig(Message.Nonce.VersionBit)


Java will take two byte arrays the message and the nonce. Then it will return a byte array in the format specified above. No support for WebSafeBase64

String input = "Message with Integrity";
String nonce = "Nonce";
Signer signer = new Signer("/path/to/your/keys");
String messsageWithSignature = signer.attachedSign(
    input.getBytes("UTF-8"), nonce.getBytes("UTF-8"));


Takes two strings as message and nonce. Then it returns a WebSafeBase64 encoded version of format specified above. Does not support unencoded messages.

signer = Signer.Read("/path/to/your/keys")
message_with_signature = signer.AttachedSign("Message with Integrity", "Nonce")


C++ will take in two strings and return the WebSafeBase64 encoded value formatted as specified above. The Encoder can be set on the signer to None if no encoding is required.

keyczar::Keyczar* signer = keyczar::Signer::Read("/path/to/your/keys");
std::string input, message_with_signature, nonce, message;
input = "Message with Integrity";
nonce = "Nonce";
if (!signer ||
    !signer->AttachedSign(input, nonce, &message_with_signature)) {
  return 1;
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