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//! The IETF variant of the ChaCha20-Poly1305 construction can safely encrypt a
//! practically unlimited number of messages, but individual messages cannot
//! exceed 64*(2^32)-64 bytes (approximatively 256 GB).

use ffi::{
    crypto_aead_chacha20poly1305_ietf_ABYTES, crypto_aead_chacha20poly1305_ietf_KEYBYTES,
    crypto_aead_chacha20poly1305_ietf_NPUBBYTES, crypto_aead_chacha20poly1305_ietf_decrypt,
    crypto_aead_chacha20poly1305_ietf_decrypt_detached, crypto_aead_chacha20poly1305_ietf_encrypt,
    crypto_aead_chacha20poly1305_ietf_encrypt_detached,
};
aead_module!(
    crypto_aead_chacha20poly1305_ietf_encrypt,
    crypto_aead_chacha20poly1305_ietf_decrypt,
    crypto_aead_chacha20poly1305_ietf_encrypt_detached,
    crypto_aead_chacha20poly1305_ietf_decrypt_detached,
    crypto_aead_chacha20poly1305_ietf_KEYBYTES as usize,
    crypto_aead_chacha20poly1305_ietf_NPUBBYTES as usize,
    crypto_aead_chacha20poly1305_ietf_ABYTES as usize,
    true
);

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

    #[test]
    fn test_vector_1() {
        // Test vector from https://tools.ietf.org/html/rfc7539#section-2.8.1
        let m = &[
            0x4c, 0x61, 0x64, 0x69, 0x65, 0x73, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x47, 0x65, 0x6e,
            0x74, 0x6c, 0x65, 0x6d, 0x65, 0x6e, 0x20, 0x6f, 0x66, 0x20, 0x74, 0x68, 0x65, 0x20,
            0x63, 0x6c, 0x61, 0x73, 0x73, 0x20, 0x6f, 0x66, 0x20, 0x27, 0x39, 0x39, 0x3a, 0x20,
            0x49, 0x66, 0x20, 0x49, 0x20, 0x63, 0x6f, 0x75, 0x6c, 0x64, 0x20, 0x6f, 0x66, 0x66,
            0x65, 0x72, 0x20, 0x79, 0x6f, 0x75, 0x20, 0x6f, 0x6e, 0x6c, 0x79, 0x20, 0x6f, 0x6e,
            0x65, 0x20, 0x74, 0x69, 0x70, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x74, 0x68, 0x65, 0x20,
            0x66, 0x75, 0x74, 0x75, 0x72, 0x65, 0x2c, 0x20, 0x73, 0x75, 0x6e, 0x73, 0x63, 0x72,
            0x65, 0x65, 0x6e, 0x20, 0x77, 0x6f, 0x75, 0x6c, 0x64, 0x20, 0x62, 0x65, 0x20, 0x69,
            0x74, 0x2e,
        ];
        let ad = &[
            0x50, 0x51, 0x52, 0x53, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
        ];
        let k = Key([
            0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d,
            0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
            0x9c, 0x9d, 0x9e, 0x9f,
        ]);
        let n = Nonce([
            0x07, 0x00, 0x00, 0x00, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
        ]);

        let c_expected = &[
            0xd3, 0x1a, 0x8d, 0x34, 0x64, 0x8e, 0x60, 0xdb, 0x7b, 0x86, 0xaf, 0xbc, 0x53, 0xef,
            0x7e, 0xc2, 0xa4, 0xad, 0xed, 0x51, 0x29, 0x6e, 0x08, 0xfe, 0xa9, 0xe2, 0xb5, 0xa7,
            0x36, 0xee, 0x62, 0xd6, 0x3d, 0xbe, 0xa4, 0x5e, 0x8c, 0xa9, 0x67, 0x12, 0x82, 0xfa,
            0xfb, 0x69, 0xda, 0x92, 0x72, 0x8b, 0x1a, 0x71, 0xde, 0x0a, 0x9e, 0x06, 0x0b, 0x29,
            0x05, 0xd6, 0xa5, 0xb6, 0x7e, 0xcd, 0x3b, 0x36, 0x92, 0xdd, 0xbd, 0x7f, 0x2d, 0x77,
            0x8b, 0x8c, 0x98, 0x03, 0xae, 0xe3, 0x28, 0x09, 0x1b, 0x58, 0xfa, 0xb3, 0x24, 0xe4,
            0xfa, 0xd6, 0x75, 0x94, 0x55, 0x85, 0x80, 0x8b, 0x48, 0x31, 0xd7, 0xbc, 0x3f, 0xf4,
            0xde, 0xf0, 0x8e, 0x4b, 0x7a, 0x9d, 0xe5, 0x76, 0xd2, 0x65, 0x86, 0xce, 0xc6, 0x4b,
            0x61, 0x16, 0x1a, 0xe1, 0x0b, 0x59, 0x4f, 0x09, 0xe2, 0x6a, 0x7e, 0x90, 0x2e, 0xcb,
            0xd0, 0x60, 0x06, 0x91,
        ];
        let c = seal(m, Some(ad), &n, &k);
        assert_eq!(&c[..], &c_expected[..]);
    }

    // Test vectors 2, 3, 4 sources are retrieved from libressl test files
    // https://fossies.org/linux/libressl/tests/aeadtests.txt

    #[test]
    fn test_vector_2() {
        // Test vector from https://tools.ietf.org/html/rfc7539#appendix-A.5
        let m = &[
            0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2d, 0x44, 0x72, 0x61, 0x66, 0x74,
            0x73, 0x20, 0x61, 0x72, 0x65, 0x20, 0x64, 0x72, 0x61, 0x66, 0x74, 0x20, 0x64, 0x6f,
            0x63, 0x75, 0x6d, 0x65, 0x6e, 0x74, 0x73, 0x20, 0x76, 0x61, 0x6c, 0x69, 0x64, 0x20,
            0x66, 0x6f, 0x72, 0x20, 0x61, 0x20, 0x6d, 0x61, 0x78, 0x69, 0x6d, 0x75, 0x6d, 0x20,
            0x6f, 0x66, 0x20, 0x73, 0x69, 0x78, 0x20, 0x6d, 0x6f, 0x6e, 0x74, 0x68, 0x73, 0x20,
            0x61, 0x6e, 0x64, 0x20, 0x6d, 0x61, 0x79, 0x20, 0x62, 0x65, 0x20, 0x75, 0x70, 0x64,
            0x61, 0x74, 0x65, 0x64, 0x2c, 0x20, 0x72, 0x65, 0x70, 0x6c, 0x61, 0x63, 0x65, 0x64,
            0x2c, 0x20, 0x6f, 0x72, 0x20, 0x6f, 0x62, 0x73, 0x6f, 0x6c, 0x65, 0x74, 0x65, 0x64,
            0x20, 0x62, 0x79, 0x20, 0x6f, 0x74, 0x68, 0x65, 0x72, 0x20, 0x64, 0x6f, 0x63, 0x75,
            0x6d, 0x65, 0x6e, 0x74, 0x73, 0x20, 0x61, 0x74, 0x20, 0x61, 0x6e, 0x79, 0x20, 0x74,
            0x69, 0x6d, 0x65, 0x2e, 0x20, 0x49, 0x74, 0x20, 0x69, 0x73, 0x20, 0x69, 0x6e, 0x61,
            0x70, 0x70, 0x72, 0x6f, 0x70, 0x72, 0x69, 0x61, 0x74, 0x65, 0x20, 0x74, 0x6f, 0x20,
            0x75, 0x73, 0x65, 0x20, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2d, 0x44,
            0x72, 0x61, 0x66, 0x74, 0x73, 0x20, 0x61, 0x73, 0x20, 0x72, 0x65, 0x66, 0x65, 0x72,
            0x65, 0x6e, 0x63, 0x65, 0x20, 0x6d, 0x61, 0x74, 0x65, 0x72, 0x69, 0x61, 0x6c, 0x20,
            0x6f, 0x72, 0x20, 0x74, 0x6f, 0x20, 0x63, 0x69, 0x74, 0x65, 0x20, 0x74, 0x68, 0x65,
            0x6d, 0x20, 0x6f, 0x74, 0x68, 0x65, 0x72, 0x20, 0x74, 0x68, 0x61, 0x6e, 0x20, 0x61,
            0x73, 0x20, 0x2f, 0xe2, 0x80, 0x9c, 0x77, 0x6f, 0x72, 0x6b, 0x20, 0x69, 0x6e, 0x20,
            0x70, 0x72, 0x6f, 0x67, 0x72, 0x65, 0x73, 0x73, 0x2e, 0x2f, 0xe2, 0x80, 0x9d,
        ];
        let ad = &[
            0xf3, 0x33, 0x88, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4e, 0x91,
        ];
        let k = Key([
            0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a, 0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6,
            0xb5, 0xf0, 0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09, 0x9d, 0xca, 0x5c, 0xbc,
            0x20, 0x70, 0x75, 0xc0,
        ]);
        let n = Nonce([
            0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
        ]);

        let c_expected = &[
            0x64, 0xa0, 0x86, 0x15, 0x75, 0x86, 0x1a, 0xf4, 0x60, 0xf0, 0x62, 0xc7, 0x9b, 0xe6,
            0x43, 0xbd, 0x5e, 0x80, 0x5c, 0xfd, 0x34, 0x5c, 0xf3, 0x89, 0xf1, 0x08, 0x67, 0x0a,
            0xc7, 0x6c, 0x8c, 0xb2, 0x4c, 0x6c, 0xfc, 0x18, 0x75, 0x5d, 0x43, 0xee, 0xa0, 0x9e,
            0xe9, 0x4e, 0x38, 0x2d, 0x26, 0xb0, 0xbd, 0xb7, 0xb7, 0x3c, 0x32, 0x1b, 0x01, 0x00,
            0xd4, 0xf0, 0x3b, 0x7f, 0x35, 0x58, 0x94, 0xcf, 0x33, 0x2f, 0x83, 0x0e, 0x71, 0x0b,
            0x97, 0xce, 0x98, 0xc8, 0xa8, 0x4a, 0xbd, 0x0b, 0x94, 0x81, 0x14, 0xad, 0x17, 0x6e,
            0x00, 0x8d, 0x33, 0xbd, 0x60, 0xf9, 0x82, 0xb1, 0xff, 0x37, 0xc8, 0x55, 0x97, 0x97,
            0xa0, 0x6e, 0xf4, 0xf0, 0xef, 0x61, 0xc1, 0x86, 0x32, 0x4e, 0x2b, 0x35, 0x06, 0x38,
            0x36, 0x06, 0x90, 0x7b, 0x6a, 0x7c, 0x02, 0xb0, 0xf9, 0xf6, 0x15, 0x7b, 0x53, 0xc8,
            0x67, 0xe4, 0xb9, 0x16, 0x6c, 0x76, 0x7b, 0x80, 0x4d, 0x46, 0xa5, 0x9b, 0x52, 0x16,
            0xcd, 0xe7, 0xa4, 0xe9, 0x90, 0x40, 0xc5, 0xa4, 0x04, 0x33, 0x22, 0x5e, 0xe2, 0x82,
            0xa1, 0xb0, 0xa0, 0x6c, 0x52, 0x3e, 0xaf, 0x45, 0x34, 0xd7, 0xf8, 0x3f, 0xa1, 0x15,
            0x5b, 0x00, 0x47, 0x71, 0x8c, 0xbc, 0x54, 0x6a, 0x0d, 0x07, 0x2b, 0x04, 0xb3, 0x56,
            0x4e, 0xea, 0x1b, 0x42, 0x22, 0x73, 0xf5, 0x48, 0x27, 0x1a, 0x0b, 0xb2, 0x31, 0x60,
            0x53, 0xfa, 0x76, 0x99, 0x19, 0x55, 0xeb, 0xd6, 0x31, 0x59, 0x43, 0x4e, 0xce, 0xbb,
            0x4e, 0x46, 0x6d, 0xae, 0x5a, 0x10, 0x73, 0xa6, 0x72, 0x76, 0x27, 0x09, 0x7a, 0x10,
            0x49, 0xe6, 0x17, 0xd9, 0x1d, 0x36, 0x10, 0x94, 0xfa, 0x68, 0xf0, 0xff, 0x77, 0x98,
            0x71, 0x30, 0x30, 0x5b, 0xea, 0xba, 0x2e, 0xda, 0x04, 0xdf, 0x99, 0x7b, 0x71, 0x4d,
            0x6c, 0x6f, 0x2c, 0x29, 0xa6, 0xad, 0x5c, 0xb4, 0x02, 0x2b, 0x02, 0x70, 0x9b, 0xee,
            0xad, 0x9d, 0x67, 0x89, 0x0c, 0xbb, 0x22, 0x39, 0x23, 0x36, 0xfe, 0xa1, 0x85, 0x1f,
            0x38,
        ];
        let c = seal(m, Some(ad), &n, &k);
        assert_eq!(&c[..], &c_expected[..]);
    }

    #[test]
    fn test_vector_3() {
        // Test vector from https://tools.ietf.org/html/rfc7634#appendix-A
        let m = &[
            0x45, 0x00, 0x00, 0x54, 0xa6, 0xf2, 0x00, 0x00, 0x40, 0x01, 0xe7, 0x78, 0xc6, 0x33,
            0x64, 0x05, 0xc0, 0x00, 0x02, 0x05, 0x08, 0x00, 0x5b, 0x7a, 0x3a, 0x08, 0x00, 0x00,
            0x55, 0x3b, 0xec, 0x10, 0x00, 0x07, 0x36, 0x27, 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, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,
            0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
            0x01, 0x02, 0x02, 0x04,
        ];
        let ad = &[0x01, 0x02, 0x03, 0x04, 0x00, 0x00, 0x00, 0x05];
        let k = Key([
            0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d,
            0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
            0x9c, 0x9d, 0x9e, 0x9f,
        ]);
        let n = Nonce([
            0xa0, 0xa1, 0xa2, 0xa3, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
        ]);

        let c_expected = &[
            0x24, 0x03, 0x94, 0x28, 0xb9, 0x7f, 0x41, 0x7e, 0x3c, 0x13, 0x75, 0x3a, 0x4f, 0x05,
            0x08, 0x7b, 0x67, 0xc3, 0x52, 0xe6, 0xa7, 0xfa, 0xb1, 0xb9, 0x82, 0xd4, 0x66, 0xef,
            0x40, 0x7a, 0xe5, 0xc6, 0x14, 0xee, 0x80, 0x99, 0xd5, 0x28, 0x44, 0xeb, 0x61, 0xaa,
            0x95, 0xdf, 0xab, 0x4c, 0x02, 0xf7, 0x2a, 0xa7, 0x1e, 0x7c, 0x4c, 0x4f, 0x64, 0xc9,
            0xbe, 0xfe, 0x2f, 0xac, 0xc6, 0x38, 0xe8, 0xf3, 0xcb, 0xec, 0x16, 0x3f, 0xac, 0x46,
            0x9b, 0x50, 0x27, 0x73, 0xf6, 0xfb, 0x94, 0xe6, 0x64, 0xda, 0x91, 0x65, 0xb8, 0x28,
            0x29, 0xf6, 0x41, 0xe0, 0x76, 0xaa, 0xa8, 0x26, 0x6b, 0x7f, 0xb0, 0xf7, 0xb1, 0x1b,
            0x36, 0x99, 0x07, 0xe1, 0xad, 0x43,
        ];
        let c = seal(m, Some(ad), &n, &k);
        assert_eq!(&c[..], &c_expected[..]);
    }

    #[test]
    fn test_vector_4() {
        // Test vector from https://tools.ietf.org/html/rfc7634#appendix-B
        let m = &[
            0x00, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x40, 0x01, 0x00, 0x00, 0x00, 0x0a, 0x00,
        ];
        let ad = &[
            0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5,
            0xd6, 0xd7, 0x2e, 0x20, 0x25, 0x00, 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x45,
            0x29, 0x00, 0x00, 0x29,
        ];
        let k = Key([
            0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d,
            0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
            0x9c, 0x9d, 0x9e, 0x9f,
        ]);
        let n = Nonce([
            0xa0, 0xa1, 0xa2, 0xa3, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
        ]);

        let c_expected = &[
            0x61, 0x03, 0x94, 0x70, 0x1f, 0x8d, 0x01, 0x7f, 0x7c, 0x12, 0x92, 0x48, 0x89, 0x6b,
            0x71, 0xbf, 0xe2, 0x52, 0x36, 0xef, 0xd7, 0xcd, 0xc6, 0x70, 0x66, 0x90, 0x63, 0x15,
            0xb2,
        ];
        let c = seal(m, Some(ad), &n, &k);
        assert_eq!(&c[..], &c_expected[..]);
    }
}