class Auth (source)
Secret-key authentication.
These operations computes an authentication tag for a message and a secret key, and provides a way to verify that a given tag is valid for a given message and a key.
The function computing the tag is deterministic: the same (message, key) tuple will always produce the same output.
However, even if the message is public, knowing the key is required in order to be able to compute a valid tag. Therefore, the key should remain confidential. The tag, however, can be public.
A typical use case is:
A prepares a message, add an authentication tag, sends it to BA doesn't store the messageB sends the message and the authentication tag to AA uses the authentication tag to verify that it created this message.This operation does not encrypt the message. It only computes and verifies an authentication tag.
Key |
An Auth key. class Key : Destroyable |
auth |
Create an authentication tag for a given input. static fun auth(input: Bytes!, key: Key!): Bytes!static fun auth(input: ByteArray!, key: Key!): ByteArray! |
verify |
Verify an input using an authentication tag. static fun verify(tag: Bytes!, input: Bytes!, key: Key!): Booleanstatic fun verify(tag: ByteArray!, input: ByteArray!, key: Key!): Boolean |