const std = @import("std");
const testing = std.testing;

const aes = @import("primitive").blockcipher.aes;

test "AES-128 key expansion (FIPS 197)" {
    const key = [aes.KEY_SIZE_128]u8{
        0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
        0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c,
    };
    const expected_expansion = [(aes.N_ROUNDS_128 + 1) * 4]u32{
        0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x09cf4f3c,
        0xa0fafe17, 0x88542cb1, 0x23a33939, 0x2a6c7605,
        0xf2c295f2, 0x7a96b943, 0x5935807a, 0x7359f67f,
        0x3d80477d, 0x4716fe3e, 0x1e237e44, 0x6d7a883b,
        0xef44a541, 0xa8525b7f, 0xb671253b, 0xdb0bad00,
        0xd4d1c6f8, 0x7c839d87, 0xcaf2b8bc, 0x11f915bc,
        0x6d88a37a, 0x110b3efd, 0xdbf98641, 0xca0093fd,
        0x4e54f70e, 0x5f5fc9f3, 0x84a64fb2, 0x4ea6dc4f,
        0xead27321, 0xb58dbad2, 0x312bf560, 0x7f8d292f,
        0xac7766f3, 0x19fadc21, 0x28d12941, 0x575c006e,
        0xd014f9a8, 0xc9ee2589, 0xe13f0cc8, 0xb6630ca6,
    };
    try testing.expectEqualSlices(u32, &expected_expansion, &aes.expand_key_128(&key));
}

test "AES-192 key expansion (FIPS 197)" {
    const key = [aes.KEY_SIZE_192]u8{
        0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52,
        0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5,
        0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b,
    };
    const expected_expansion = [(aes.N_ROUNDS_192 + 1) * 4]u32{
        0x8e73b0f7, 0xda0e6452, 0xc810f32b, 0x809079e5,
        0x62f8ead2, 0x522c6b7b, 0xfe0c91f7, 0x2402f5a5,
        0xec12068e, 0x6c827f6b, 0x0e7a95b9, 0x5c56fec2,
        0x4db7b4bd, 0x69b54118, 0x85a74796, 0xe92538fd,
        0xe75fad44, 0xbb095386, 0x485af057, 0x21efb14f,
        0xa448f6d9, 0x4d6dce24, 0xaa326360, 0x113b30e6,
        0xa25e7ed5, 0x83b1cf9a, 0x27f93943, 0x6a94f767,
        0xc0a69407, 0xd19da4e1, 0xec1786eb, 0x6fa64971,
        0x485f7032, 0x22cb8755, 0xe26d1352, 0x33f0b7b3,
        0x40beeb28, 0x2f18a259, 0x6747d26b, 0x458c553e,
        0xa7e1466c, 0x9411f1df, 0x821f750a, 0xad07d753,
        0xca400538, 0x8fcc5006, 0x282d166a, 0xbc3ce7b5,
        0xe98ba06f, 0x448c773c, 0x8ecc7204, 0x01002202,
    };
    try testing.expectEqualSlices(u32, &expected_expansion, &aes.expand_key_192(&key));
}

test "AES-256 key expansion (FIPS 197)" {
    const key = [aes.KEY_SIZE_256]u8{
        0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe,
        0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81,
        0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7,
        0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4,
    };
    const expected_expansion = [(aes.N_ROUNDS_256 + 1) * 4]u32{
        0x603deb10, 0x15ca71be, 0x2b73aef0, 0x857d7781,
        0x1f352c07, 0x3b6108d7, 0x2d9810a3, 0x0914dff4,
        0x9ba35411, 0x8e6925af, 0xa51a8b5f, 0x2067fcde,
        0xa8b09c1a, 0x93d194cd, 0xbe49846e, 0xb75d5b9a,
        0xd59aecb8, 0x5bf3c917, 0xfee94248, 0xde8ebe96,
        0xb5a9328a, 0x2678a647, 0x98312229, 0x2f6c79b3,
        0x812c81ad, 0xdadf48ba, 0x24360af2, 0xfab8b464,
        0x98c5bfc9, 0xbebd198e, 0x268c3ba7, 0x09e04214,
        0x68007bac, 0xb2df3316, 0x96e939e4, 0x6c518d80,
        0xc814e204, 0x76a9fb8a, 0x5025c02d, 0x59c58239,
        0xde136967, 0x6ccc5a71, 0xfa256395, 0x9674ee15,
        0x5886ca5d, 0x2e2f31d7, 0x7e0af1fa, 0x27cf73c3,
        0x749c47ab, 0x18501dda, 0xe2757e4f, 0x7401905a,
        0xcafaaae3, 0xe4d59b34, 0x9adf6ace, 0xbd10190d,
        0xfe4890d1, 0xe6188d0b, 0x046df344, 0x706c631e,
    };
    try testing.expectEqualSlices(u32, &expected_expansion, &aes.expand_key_256(&key));
}

// https://csrc.nist.gov/projects/cryptographic-standards-and-guidelines/example-values
test "AES-128 ECB encryption (NIST)" {
    const key = [aes.KEY_SIZE_128]u8{
        0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C,
    };
    const plaintext = [_][aes.BLOCK_SIZE]u8{
        .{ 0x6B, 0xC1, 0xBE, 0xE2, 0x2E, 0x40, 0x9F, 0x96, 0xE9, 0x3D, 0x7E, 0x11, 0x73, 0x93, 0x17, 0x2A },
        .{ 0xAE, 0x2D, 0x8A, 0x57, 0x1E, 0x03, 0xAC, 0x9C, 0x9E, 0xB7, 0x6F, 0xAC, 0x45, 0xAF, 0x8E, 0x51 },
        .{ 0x30, 0xC8, 0x1C, 0x46, 0xA3, 0x5C, 0xE4, 0x11, 0xE5, 0xFB, 0xC1, 0x19, 0x1A, 0x0A, 0x52, 0xEF },
        .{ 0xF6, 0x9F, 0x24, 0x45, 0xDF, 0x4F, 0x9B, 0x17, 0xAD, 0x2B, 0x41, 0x7B, 0xE6, 0x6C, 0x37, 0x10 },
    };
    const ciphertext = [_][aes.BLOCK_SIZE]u8{
        .{ 0x3A, 0xD7, 0x7B, 0xB4, 0x0D, 0x7A, 0x36, 0x60, 0xA8, 0x9E, 0xCA, 0xF3, 0x24, 0x66, 0xEF, 0x97 },
        .{ 0xF5, 0xD3, 0xD5, 0x85, 0x03, 0xB9, 0x69, 0x9D, 0xE7, 0x85, 0x89, 0x5A, 0x96, 0xFD, 0xBA, 0xAF },
        .{ 0x43, 0xB1, 0xCD, 0x7F, 0x59, 0x8E, 0xCE, 0x23, 0x88, 0x1B, 0x00, 0xE3, 0xED, 0x03, 0x06, 0x88 },
        .{ 0x7B, 0x0C, 0x78, 0x5E, 0x27, 0xE8, 0xAD, 0x3F, 0x82, 0x23, 0x20, 0x71, 0x04, 0x72, 0x5D, 0xD4 },
    };

    var buffer: [aes.BLOCK_SIZE]u8 = undefined;
    for (plaintext, 0..) |pt, i| {
        aes.aes128_encrypt_block(&key, &pt, &buffer);
        try testing.expectEqualSlices(u8, &ciphertext[i], &buffer);
    }
}

// https://csrc.nist.gov/projects/cryptographic-standards-and-guidelines/example-values
test "AES-128 ECB decryption (NIST)" {
    const key = [aes.KEY_SIZE_128]u8{
        0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C,
    };
    const plaintext = [_][aes.BLOCK_SIZE]u8{
        .{ 0x6B, 0xC1, 0xBE, 0xE2, 0x2E, 0x40, 0x9F, 0x96, 0xE9, 0x3D, 0x7E, 0x11, 0x73, 0x93, 0x17, 0x2A },
        .{ 0xAE, 0x2D, 0x8A, 0x57, 0x1E, 0x03, 0xAC, 0x9C, 0x9E, 0xB7, 0x6F, 0xAC, 0x45, 0xAF, 0x8E, 0x51 },
        .{ 0x30, 0xC8, 0x1C, 0x46, 0xA3, 0x5C, 0xE4, 0x11, 0xE5, 0xFB, 0xC1, 0x19, 0x1A, 0x0A, 0x52, 0xEF },
        .{ 0xF6, 0x9F, 0x24, 0x45, 0xDF, 0x4F, 0x9B, 0x17, 0xAD, 0x2B, 0x41, 0x7B, 0xE6, 0x6C, 0x37, 0x10 },
    };
    const ciphertext = [_][aes.BLOCK_SIZE]u8{
        .{ 0x3A, 0xD7, 0x7B, 0xB4, 0x0D, 0x7A, 0x36, 0x60, 0xA8, 0x9E, 0xCA, 0xF3, 0x24, 0x66, 0xEF, 0x97 },
        .{ 0xF5, 0xD3, 0xD5, 0x85, 0x03, 0xB9, 0x69, 0x9D, 0xE7, 0x85, 0x89, 0x5A, 0x96, 0xFD, 0xBA, 0xAF },
        .{ 0x43, 0xB1, 0xCD, 0x7F, 0x59, 0x8E, 0xCE, 0x23, 0x88, 0x1B, 0x00, 0xE3, 0xED, 0x03, 0x06, 0x88 },
        .{ 0x7B, 0x0C, 0x78, 0x5E, 0x27, 0xE8, 0xAD, 0x3F, 0x82, 0x23, 0x20, 0x71, 0x04, 0x72, 0x5D, 0xD4 },
    };

    var buffer: [aes.BLOCK_SIZE]u8 = undefined;
    for (ciphertext, 0..) |ct, i| {
        aes.aes128_decrypt_block(&key, &ct, &buffer);
        try testing.expectEqualSlices(u8, &plaintext[i], &buffer);
    }
}

// https://csrc.nist.gov/projects/cryptographic-standards-and-guidelines/example-values
test "AES-192 ECB encryption (NIST)" {
    const key = [aes.KEY_SIZE_192]u8{
        0x8E, 0x73, 0xB0, 0xF7, 0xDA, 0x0E, 0x64, 0x52,
        0xC8, 0x10, 0xF3, 0x2B, 0x80, 0x90, 0x79, 0xE5,
        0x62, 0xF8, 0xEA, 0xD2, 0x52, 0x2C, 0x6B, 0x7B,
    };
    const plaintext = [_][aes.BLOCK_SIZE]u8{
        .{ 0x6B, 0xC1, 0xBE, 0xE2, 0x2E, 0x40, 0x9F, 0x96, 0xE9, 0x3D, 0x7E, 0x11, 0x73, 0x93, 0x17, 0x2A },
        .{ 0xAE, 0x2D, 0x8A, 0x57, 0x1E, 0x03, 0xAC, 0x9C, 0x9E, 0xB7, 0x6F, 0xAC, 0x45, 0xAF, 0x8E, 0x51 },
        .{ 0x30, 0xC8, 0x1C, 0x46, 0xA3, 0x5C, 0xE4, 0x11, 0xE5, 0xFB, 0xC1, 0x19, 0x1A, 0x0A, 0x52, 0xEF },
        .{ 0xF6, 0x9F, 0x24, 0x45, 0xDF, 0x4F, 0x9B, 0x17, 0xAD, 0x2B, 0x41, 0x7B, 0xE6, 0x6C, 0x37, 0x10 },
    };
    const ciphertext = [_][aes.BLOCK_SIZE]u8{
        .{ 0xBD, 0x33, 0x4F, 0x1D, 0x6E, 0x45, 0xF2, 0x5F, 0xF7, 0x12, 0xA2, 0x14, 0x57, 0x1F, 0xA5, 0xCC },
        .{ 0x97, 0x41, 0x04, 0x84, 0x6D, 0x0A, 0xD3, 0xAD, 0x77, 0x34, 0xEC, 0xB3, 0xEC, 0xEE, 0x4E, 0xEF },
        .{ 0xEF, 0x7A, 0xFD, 0x22, 0x70, 0xE2, 0xE6, 0x0A, 0xDC, 0xE0, 0xBA, 0x2F, 0xAC, 0xE6, 0x44, 0x4E },
        .{ 0x9A, 0x4B, 0x41, 0xBA, 0x73, 0x8D, 0x6C, 0x72, 0xFB, 0x16, 0x69, 0x16, 0x03, 0xC1, 0x8E, 0x0E },
    };

    var buffer: [aes.BLOCK_SIZE]u8 = undefined;
    for (plaintext, 0..) |pt, i| {
        aes.aes192_encrypt_block(&key, &pt, &buffer);
        try testing.expectEqualSlices(u8, &ciphertext[i], &buffer);
    }
}

// https://csrc.nist.gov/projects/cryptographic-standards-and-guidelines/example-values
test "AES-192 ECB decryption (NIST)" {
    const key = [aes.KEY_SIZE_192]u8{
        0x8E, 0x73, 0xB0, 0xF7, 0xDA, 0x0E, 0x64, 0x52,
        0xC8, 0x10, 0xF3, 0x2B, 0x80, 0x90, 0x79, 0xE5,
        0x62, 0xF8, 0xEA, 0xD2, 0x52, 0x2C, 0x6B, 0x7B,
    };
    const plaintext = [_][aes.BLOCK_SIZE]u8{
        .{ 0x6B, 0xC1, 0xBE, 0xE2, 0x2E, 0x40, 0x9F, 0x96, 0xE9, 0x3D, 0x7E, 0x11, 0x73, 0x93, 0x17, 0x2A },
        .{ 0xAE, 0x2D, 0x8A, 0x57, 0x1E, 0x03, 0xAC, 0x9C, 0x9E, 0xB7, 0x6F, 0xAC, 0x45, 0xAF, 0x8E, 0x51 },
        .{ 0x30, 0xC8, 0x1C, 0x46, 0xA3, 0x5C, 0xE4, 0x11, 0xE5, 0xFB, 0xC1, 0x19, 0x1A, 0x0A, 0x52, 0xEF },
        .{ 0xF6, 0x9F, 0x24, 0x45, 0xDF, 0x4F, 0x9B, 0x17, 0xAD, 0x2B, 0x41, 0x7B, 0xE6, 0x6C, 0x37, 0x10 },
    };
    const ciphertext = [_][aes.BLOCK_SIZE]u8{
        .{ 0xBD, 0x33, 0x4F, 0x1D, 0x6E, 0x45, 0xF2, 0x5F, 0xF7, 0x12, 0xA2, 0x14, 0x57, 0x1F, 0xA5, 0xCC },
        .{ 0x97, 0x41, 0x04, 0x84, 0x6D, 0x0A, 0xD3, 0xAD, 0x77, 0x34, 0xEC, 0xB3, 0xEC, 0xEE, 0x4E, 0xEF },
        .{ 0xEF, 0x7A, 0xFD, 0x22, 0x70, 0xE2, 0xE6, 0x0A, 0xDC, 0xE0, 0xBA, 0x2F, 0xAC, 0xE6, 0x44, 0x4E },
        .{ 0x9A, 0x4B, 0x41, 0xBA, 0x73, 0x8D, 0x6C, 0x72, 0xFB, 0x16, 0x69, 0x16, 0x03, 0xC1, 0x8E, 0x0E },
    };

    var buffer: [aes.BLOCK_SIZE]u8 = undefined;
    for (ciphertext, 0..) |ct, i| {
        aes.aes192_decrypt_block(&key, &ct, &buffer);
        try testing.expectEqualSlices(u8, &plaintext[i], &buffer);
    }
}

// https://csrc.nist.gov/projects/cryptographic-standards-and-guidelines/example-values
test "AES-256 ECB encryption (NIST)" {
    const key = [aes.KEY_SIZE_256]u8{
        0x60, 0x3D, 0xEB, 0x10, 0x15, 0xCA, 0x71, 0xBE, 0x2B, 0x73, 0xAE, 0xF0, 0x85, 0x7D, 0x77, 0x81,
        0x1F, 0x35, 0x2C, 0x07, 0x3B, 0x61, 0x08, 0xD7, 0x2D, 0x98, 0x10, 0xA3, 0x09, 0x14, 0xDF, 0xF4,
    };
    const plaintext = [_][aes.BLOCK_SIZE]u8{
        .{ 0x6B, 0xC1, 0xBE, 0xE2, 0x2E, 0x40, 0x9F, 0x96, 0xE9, 0x3D, 0x7E, 0x11, 0x73, 0x93, 0x17, 0x2A },
        .{ 0xAE, 0x2D, 0x8A, 0x57, 0x1E, 0x03, 0xAC, 0x9C, 0x9E, 0xB7, 0x6F, 0xAC, 0x45, 0xAF, 0x8E, 0x51 },
        .{ 0x30, 0xC8, 0x1C, 0x46, 0xA3, 0x5C, 0xE4, 0x11, 0xE5, 0xFB, 0xC1, 0x19, 0x1A, 0x0A, 0x52, 0xEF },
        .{ 0xF6, 0x9F, 0x24, 0x45, 0xDF, 0x4F, 0x9B, 0x17, 0xAD, 0x2B, 0x41, 0x7B, 0xE6, 0x6C, 0x37, 0x10 },
    };
    const ciphertext = [_][aes.BLOCK_SIZE]u8{
        .{ 0xF3, 0xEE, 0xD1, 0xBD, 0xB5, 0xD2, 0xA0, 0x3C, 0x06, 0x4B, 0x5A, 0x7E, 0x3D, 0xB1, 0x81, 0xF8 },
        .{ 0x59, 0x1C, 0xCB, 0x10, 0xD4, 0x10, 0xED, 0x26, 0xDC, 0x5B, 0xA7, 0x4A, 0x31, 0x36, 0x28, 0x70 },
        .{ 0xB6, 0xED, 0x21, 0xB9, 0x9C, 0xA6, 0xF4, 0xF9, 0xF1, 0x53, 0xE7, 0xB1, 0xBE, 0xAF, 0xED, 0x1D },
        .{ 0x23, 0x30, 0x4B, 0x7A, 0x39, 0xF9, 0xF3, 0xFF, 0x06, 0x7D, 0x8D, 0x8F, 0x9E, 0x24, 0xEC, 0xC7 },
    };

    var buffer: [aes.BLOCK_SIZE]u8 = undefined;
    for (plaintext, 0..) |pt, i| {
        aes.aes256_encrypt_block(&key, &pt, &buffer);
        try testing.expectEqualSlices(u8, &ciphertext[i], &buffer);
    }
}

// https://csrc.nist.gov/projects/cryptographic-standards-and-guidelines/example-values
test "AES-256 ECB decryption (NIST)" {
    const key = [aes.KEY_SIZE_256]u8{
        0x60, 0x3D, 0xEB, 0x10, 0x15, 0xCA, 0x71, 0xBE, 0x2B, 0x73, 0xAE, 0xF0, 0x85, 0x7D, 0x77, 0x81,
        0x1F, 0x35, 0x2C, 0x07, 0x3B, 0x61, 0x08, 0xD7, 0x2D, 0x98, 0x10, 0xA3, 0x09, 0x14, 0xDF, 0xF4,
    };
    const plaintext = [_][aes.BLOCK_SIZE]u8{
        .{ 0x6B, 0xC1, 0xBE, 0xE2, 0x2E, 0x40, 0x9F, 0x96, 0xE9, 0x3D, 0x7E, 0x11, 0x73, 0x93, 0x17, 0x2A },
        .{ 0xAE, 0x2D, 0x8A, 0x57, 0x1E, 0x03, 0xAC, 0x9C, 0x9E, 0xB7, 0x6F, 0xAC, 0x45, 0xAF, 0x8E, 0x51 },
        .{ 0x30, 0xC8, 0x1C, 0x46, 0xA3, 0x5C, 0xE4, 0x11, 0xE5, 0xFB, 0xC1, 0x19, 0x1A, 0x0A, 0x52, 0xEF },
        .{ 0xF6, 0x9F, 0x24, 0x45, 0xDF, 0x4F, 0x9B, 0x17, 0xAD, 0x2B, 0x41, 0x7B, 0xE6, 0x6C, 0x37, 0x10 },
    };
    const ciphertext = [_][aes.BLOCK_SIZE]u8{
        .{ 0xF3, 0xEE, 0xD1, 0xBD, 0xB5, 0xD2, 0xA0, 0x3C, 0x06, 0x4B, 0x5A, 0x7E, 0x3D, 0xB1, 0x81, 0xF8 },
        .{ 0x59, 0x1C, 0xCB, 0x10, 0xD4, 0x10, 0xED, 0x26, 0xDC, 0x5B, 0xA7, 0x4A, 0x31, 0x36, 0x28, 0x70 },
        .{ 0xB6, 0xED, 0x21, 0xB9, 0x9C, 0xA6, 0xF4, 0xF9, 0xF1, 0x53, 0xE7, 0xB1, 0xBE, 0xAF, 0xED, 0x1D },
        .{ 0x23, 0x30, 0x4B, 0x7A, 0x39, 0xF9, 0xF3, 0xFF, 0x06, 0x7D, 0x8D, 0x8F, 0x9E, 0x24, 0xEC, 0xC7 },
    };

    var buffer: [aes.BLOCK_SIZE]u8 = undefined;
    for (ciphertext, 0..) |ct, i| {
        aes.aes256_decrypt_block(&key, &ct, &buffer);
        try testing.expectEqualSlices(u8, &plaintext[i], &buffer);
    }
}

test "AES S-box inverse is the inverse S-box" {
    for (0..256) |x| {
        try testing.expectEqual(x, aes.INV_SBOX[aes.SBOX[x]]);
    }
}

test "AES SubBytes" {
    var state = [aes.BLOCK_SIZE]u8{
        0x40, 0xBF, 0xAB, 0xF4, 0x06, 0xEE, 0x4D, 0x30,
        0x42, 0xCA, 0x6B, 0x99, 0x7A, 0x5C, 0x58, 0x16,
    };
    const reference = [aes.BLOCK_SIZE]u8{
        0x09, 0x08, 0x62, 0xBF, 0x6F, 0x28, 0xE3, 0x04,
        0x2C, 0x74, 0x7F, 0xEE, 0xDA, 0x4A, 0x6A, 0x47,
    };

    aes.sub_bytes(&state);
    try testing.expectEqualSlices(u8, &reference, &state);
}

test "AES ShiftRows" {
    var state = [aes.BLOCK_SIZE]u8{
        0x09, 0x08, 0x62, 0xBF, 0x6F, 0x28, 0xE3, 0x04,
        0x2C, 0x74, 0x7F, 0xEE, 0xDA, 0x4A, 0x6A, 0x47,
    };
    const reference = [aes.BLOCK_SIZE]u8{
        0x09, 0x28, 0x7F, 0x47, 0x6F, 0x74, 0x6A, 0xBF,
        0x2C, 0x4A, 0x62, 0x04, 0xDA, 0x08, 0xE3, 0xEE,
    };

    aes.shift_rows(&state);
    try testing.expectEqualSlices(u8, &reference, &state);
}

test "AES MixColumns" {
    var state = [aes.BLOCK_SIZE]u8{
        0x09, 0x28, 0x7F, 0x47, 0x6F, 0x74, 0x6A, 0xBF,
        0x2C, 0x4A, 0x62, 0x04, 0xDA, 0x08, 0xE3, 0xEE,
    };
    const reference = [aes.BLOCK_SIZE]u8{
        0x52, 0x9F, 0x16, 0xC2, 0x97, 0x86, 0x15, 0xCA,
        0xE0, 0x1A, 0xAE, 0x54, 0xBA, 0x1A, 0x26, 0x59,
    };

    aes.mix_columns(&state);
    try testing.expectEqualSlices(u8, &reference, &state);
}

test "AES InvSubBytes" {
    const reference = [aes.BLOCK_SIZE]u8{
        0x40, 0xBF, 0xAB, 0xF4, 0x06, 0xEE, 0x4D, 0x30,
        0x42, 0xCA, 0x6B, 0x99, 0x7A, 0x5C, 0x58, 0x16,
    };
    var state = [aes.BLOCK_SIZE]u8{
        0x09, 0x08, 0x62, 0xBF, 0x6F, 0x28, 0xE3, 0x04,
        0x2C, 0x74, 0x7F, 0xEE, 0xDA, 0x4A, 0x6A, 0x47,
    };

    aes.inv_sub_bytes(&state);
    try testing.expectEqualSlices(u8, &reference, &state);
}

test "AES InvShiftRows" {
    const reference = [aes.BLOCK_SIZE]u8{
        0x09, 0x08, 0x62, 0xBF, 0x6F, 0x28, 0xE3, 0x04,
        0x2C, 0x74, 0x7F, 0xEE, 0xDA, 0x4A, 0x6A, 0x47,
    };
    var state = [aes.BLOCK_SIZE]u8{
        0x09, 0x28, 0x7F, 0x47, 0x6F, 0x74, 0x6A, 0xBF,
        0x2C, 0x4A, 0x62, 0x04, 0xDA, 0x08, 0xE3, 0xEE,
    };

    aes.inv_shift_rows(&state);
    try testing.expectEqualSlices(u8, &reference, &state);
}

test "AES InvMixColumns" {
    const reference = [aes.BLOCK_SIZE]u8{
        0x09, 0x28, 0x7F, 0x47, 0x6F, 0x74, 0x6A, 0xBF,
        0x2C, 0x4A, 0x62, 0x04, 0xDA, 0x08, 0xE3, 0xEE,
    };
    var state = [aes.BLOCK_SIZE]u8{
        0x52, 0x9F, 0x16, 0xC2, 0x97, 0x86, 0x15, 0xCA,
        0xE0, 0x1A, 0xAE, 0x54, 0xBA, 0x1A, 0x26, 0x59,
    };

    aes.inv_mix_columns(&state);
    try testing.expectEqualSlices(u8, &reference, &state);
}