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//! `crypto_onetimeauth_poly1305`, an authenticator specified
//! in [Cryptography in `NaCl`](http://nacl.cr.yp.to/valid.html), Section 9. This
//! authenticator is proven to meet the standard notion of unforgeability after a
//! single message.

use ffi::{
    crypto_onetimeauth_poly1305, crypto_onetimeauth_poly1305_BYTES,
    crypto_onetimeauth_poly1305_KEYBYTES, crypto_onetimeauth_poly1305_verify,
};

auth_module!(
    crypto_onetimeauth_poly1305,
    crypto_onetimeauth_poly1305_verify,
    crypto_onetimeauth_poly1305_KEYBYTES as usize,
    crypto_onetimeauth_poly1305_BYTES as usize
);

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

    #[test]
    fn test_vector_1() {
        // corresponding to tests/onetimeauth.c, tests/onetimeauth2.c,
        // tests/onetimeauth5.cpp and tests/onetimeauth6.cpp from NaCl
        let key = Key([
            0xee, 0xa6, 0xa7, 0x25, 0x1c, 0x1e, 0x72, 0x91, 0x6d, 0x11, 0xc2, 0xcb, 0x21, 0x4d,
            0x3c, 0x25, 0x25, 0x39, 0x12, 0x1d, 0x8e, 0x23, 0x4e, 0x65, 0x2d, 0x65, 0x1f, 0xa4,
            0xc8, 0xcf, 0xf8, 0x80,
        ]);

        let c = [
            0x8e, 0x99, 0x3b, 0x9f, 0x48, 0x68, 0x12, 0x73, 0xc2, 0x96, 0x50, 0xba, 0x32, 0xfc,
            0x76, 0xce, 0x48, 0x33, 0x2e, 0xa7, 0x16, 0x4d, 0x96, 0xa4, 0x47, 0x6f, 0xb8, 0xc5,
            0x31, 0xa1, 0x18, 0x6a, 0xc0, 0xdf, 0xc1, 0x7c, 0x98, 0xdc, 0xe8, 0x7b, 0x4d, 0xa7,
            0xf0, 0x11, 0xec, 0x48, 0xc9, 0x72, 0x71, 0xd2, 0xc2, 0x0f, 0x9b, 0x92, 0x8f, 0xe2,
            0x27, 0x0d, 0x6f, 0xb8, 0x63, 0xd5, 0x17, 0x38, 0xb4, 0x8e, 0xee, 0xe3, 0x14, 0xa7,
            0xcc, 0x8a, 0xb9, 0x32, 0x16, 0x45, 0x48, 0xe5, 0x26, 0xae, 0x90, 0x22, 0x43, 0x68,
            0x51, 0x7a, 0xcf, 0xea, 0xbd, 0x6b, 0xb3, 0x73, 0x2b, 0xc0, 0xe9, 0xda, 0x99, 0x83,
            0x2b, 0x61, 0xca, 0x01, 0xb6, 0xde, 0x56, 0x24, 0x4a, 0x9e, 0x88, 0xd5, 0xf9, 0xb3,
            0x79, 0x73, 0xf6, 0x22, 0xa4, 0x3d, 0x14, 0xa6, 0x59, 0x9b, 0x1f, 0x65, 0x4c, 0xb4,
            0x5a, 0x74, 0xe3, 0x55, 0xa5,
        ];

        let a_expected = Tag([
            0xf3, 0xff, 0xc7, 0x70, 0x3f, 0x94, 0x00, 0xe5, 0x2a, 0x7d, 0xfb, 0x4b, 0x3d, 0x33,
            0x05, 0xd9,
        ]);
        let a = authenticate(&c, &key);
        assert!(a == a_expected);
        assert!(verify(&a, &c, &key));
    }
}