Module dryoc::classic::crypto_onetimeauth

One-time authentication

Implements one-time authentication using the Poly1305 algorithm, compatible with libsodium’s crypto_onetimeauth_* functions.

Classic API single-part example

use base64::encode;
use dryoc::classic::crypto_onetimeauth::{
    crypto_onetimeauth, crypto_onetimeauth_keygen, crypto_onetimeauth_verify, Mac,
};

let key = crypto_onetimeauth_keygen();
let mut mac = Mac::default();

crypto_onetimeauth(&mut mac, b"Data to authenticate", &key);

// This should be valid
crypto_onetimeauth_verify(&mac, b"Data to authenticate", &key).expect("failed to authenticate");

// This should not be valid
crypto_onetimeauth_verify(&mac, b"Invalid data", &key).expect_err("should not authenticate");

Classic API multi-part example

use base64::encode;
use dryoc::classic::crypto_onetimeauth::{
    crypto_onetimeauth_final, crypto_onetimeauth_init, crypto_onetimeauth_keygen,
    crypto_onetimeauth_update, crypto_onetimeauth_verify, Mac,
};

let key = crypto_onetimeauth_keygen();
let mut mac = Mac::default();

let mut state = crypto_onetimeauth_init(&key);
crypto_onetimeauth_update(&mut state, b"Multi-part");
crypto_onetimeauth_update(&mut state, b"data");
crypto_onetimeauth_final(state, &mut mac);

// This should be valid
crypto_onetimeauth_verify(&mac, b"Multi-partdata", &key).expect("failed to authenticate");

// This should not be valid
crypto_onetimeauth_verify(&mac, b"Invalid data", &key).expect_err("should not authenticate");

Structs

• OnetimeauthState
  Internal state for crypto_onetimeauth.

Functions

• crypto_onetimeauth
  Authenticates message using key, and places the result into mac. key should only be used once.
• crypto_onetimeauth_final
  Finalizes the message authentication code for state, and places the result into output.
• crypto_onetimeauth_init
  Initialize the incremental interface for Poly1305-based one-time authentication, using key. Returns a state struct which is required for subsequent calls to crypto_onetimeauth_update and crypto_onetimeauth_final. The key should only be used once.
• crypto_onetimeauth_keygen
  Generates a random key using copy_randombytes, suitable for use with crypto_onetimeauth_init and crypto_onetimeauth. The key should only be used once.
• crypto_onetimeauth_update
  Updates state for the one-time authentication function, based on input.
• crypto_onetimeauth_verify
  Verifies that mac is the correct authenticator for message using key. Returns Ok(()) if the message authentication code is valid.

Type Definitions

• Key
  Key type for use with one-time authentication.
• Mac
  Message authentication code type for use with one-time authentication.