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//! `HMAC-SHA-256` `HMAC-SHA-256` is conjectured to meet the standard notion of
//! unforgeability.
use ffi::{crypto_auth_hmacsha256,
          crypto_auth_hmacsha256_verify,
          crypto_auth_hmacsha256_state,
          crypto_auth_hmacsha256_init,
          crypto_auth_hmacsha256_update,
          crypto_auth_hmacsha256_final,
          crypto_auth_hmacsha256_KEYBYTES,
          crypto_auth_hmacsha256_BYTES
};

auth_module!(crypto_auth_hmacsha256,
             crypto_auth_hmacsha256_verify,
             crypto_auth_hmacsha256_KEYBYTES,
             crypto_auth_hmacsha256_BYTES);

auth_state!(crypto_auth_hmacsha256_state,
            crypto_auth_hmacsha256_init,
            crypto_auth_hmacsha256_update,
            crypto_auth_hmacsha256_final,
            crypto_auth_hmacsha256_BYTES);

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_vector_1() {
        // corresponding to tests/auth2.c from NaCl
        let key = Key([0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08
                      ,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10
                      ,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18
                      ,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0x20]);
        let c = [0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd];
        let a_expected = Tag([0x37,0x2e,0xfc,0xf9,0xb4,0x0b,0x35,0xc2
                             ,0x11,0x5b,0x13,0x46,0x90,0x3d,0x2e,0xf4
                             ,0x2f,0xce,0xd4,0x6f,0x08,0x46,0xe7,0x25
                             ,0x7b,0xb1,0x56,0xd3,0xd7,0xb3,0x0d,0x3f]);
        let a = authenticate(&c, &key);
        assert!(a == a_expected);
    }

    #[test]
    fn test_vector_state_1() {
        // corresponding to tests/auth2.c from NaCl
        let key = [0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08
                  ,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10
                  ,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18
                  ,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0x20];
        let c = [0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd
                ,0xcd,0xcd];
        let a_expected = Tag([0x37,0x2e,0xfc,0xf9,0xb4,0x0b,0x35,0xc2
                             ,0x11,0x5b,0x13,0x46,0x90,0x3d,0x2e,0xf4
                             ,0x2f,0xce,0xd4,0x6f,0x08,0x46,0xe7,0x25
                             ,0x7b,0xb1,0x56,0xd3,0xd7,0xb3,0x0d,0x3f]);
        let mut state = State::init(&key);
        state.update(&c);
        let a = state.finalize();
        assert!(a == a_expected);
    }
}