/*
 * Copyright (C) 2015 René Kijewski <rene.kijewski@fu-berlin.de>
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

#include "embUnit/embUnit.h"
#include "tests-crypto.h"

#include "crypto/chacha.h"

#include <string.h>

static const uint8_t TC8_KEY[32] = {
    0xc4, 0x6e, 0xc1, 0xb1, 0x8c, 0xe8, 0xa8, 0x78,
    0x72, 0x5a, 0x37, 0xe7, 0x80, 0xdf, 0xb7, 0x35,
};
static const uint8_t TC8_IV[8] = {
    0x1a, 0xda, 0x31, 0xd5, 0xcf, 0x68, 0x82, 0x21,
};

static const uint32_t TC8_AFTER_INIT[16] = {
    0x61707865, 0x3120646e, 0x79622d36, 0x6b206574,
    0xb1c16ec4, 0x78a8e88c, 0xe7375a72, 0x35b7df80,
    0xb1c16ec4, 0x78a8e88c, 0xe7375a72, 0x35b7df80,
    0x00000000, 0x00000000, 0xd531da1a, 0x218268cf,
};

static const uint8_t TC8_CHACHA8_BLOCK0[64] = {
    0x6a, 0x87, 0x01, 0x08, 0x85, 0x9f, 0x67, 0x91,
    0x18, 0xf3, 0xe2, 0x05, 0xe2, 0xa5, 0x6a, 0x68,
    0x26, 0xef, 0x5a, 0x60, 0xa4, 0x10, 0x2a, 0xc8,
    0xd4, 0x77, 0x00, 0x59, 0xfc, 0xb7, 0xc7, 0xba,
    0xe0, 0x2f, 0x5c, 0xe0, 0x04, 0xa6, 0xbf, 0xbb,
    0xea, 0x53, 0x01, 0x4d, 0xd8, 0x21, 0x07, 0xc0,
    0xaa, 0x1c, 0x7c, 0xe1, 0x1b, 0x7d, 0x78, 0xf2,
    0xd5, 0x0b, 0xd3, 0x60, 0x2b, 0xbd, 0x25, 0x94,
};

static const uint8_t TC8_CHACHA8_BLOCK1[64] = {
    0x05, 0x60, 0xbb, 0x6a, 0x84, 0x28, 0x9e, 0x0b,
    0x38, 0xf5, 0xdd, 0x21, 0xd6, 0xef, 0x6d, 0x77,
    0x37, 0xe3, 0xec, 0x0f, 0xb7, 0x72, 0xda, 0x2c,
    0x71, 0xc2, 0x39, 0x77, 0x62, 0xe5, 0xdb, 0xbb,
    0xf4, 0x49, 0xe3, 0xd1, 0x63, 0x9c, 0xcb, 0xfa,
    0x3e, 0x06, 0x9c, 0x4d, 0x87, 0x1e, 0xd6, 0x39,
    0x5b, 0x22, 0xaa, 0xf3, 0x5c, 0x8d, 0xa6, 0xde,
    0x2d, 0xec, 0x3d, 0x77, 0x88, 0x0d, 0xa8, 0xe8,
};

static const uint8_t TC8_CHACHA12_BLOCK0[64] = {
    0xb0, 0x2b, 0xd8, 0x1e, 0xb5, 0x5c, 0x8f, 0x68,
    0xb5, 0xe9, 0xca, 0x4e, 0x30, 0x70, 0x79, 0xbc,
    0x22, 0x5b, 0xd2, 0x20, 0x07, 0xed, 0xdc, 0x67,
    0x02, 0x80, 0x18, 0x20, 0x70, 0x9c, 0xe0, 0x98,
    0x07, 0x04, 0x6a, 0x0d, 0x2a, 0xa5, 0x52, 0xbf,
    0xdb, 0xb4, 0x94, 0x66, 0x17, 0x6d, 0x56, 0xe3,
    0x2d, 0x51, 0x9e, 0x10, 0xf5, 0xad, 0x5f, 0x27,
    0x46, 0xe2, 0x41, 0xe0, 0x9b, 0xdf, 0x99, 0x59,
};

static const uint8_t TC8_CHACHA12_BLOCK1[64] = {
    0x17, 0xbe, 0x08, 0x73, 0xed, 0xde, 0x9a, 0xf5,
    0xb8, 0x62, 0x46, 0x44, 0x1c, 0xe4, 0x10, 0x19,
    0x5b, 0xae, 0xde, 0x41, 0xf8, 0xbd, 0xab, 0x6a,
    0xd2, 0x53, 0x22, 0x63, 0x82, 0xee, 0x38, 0x3e,
    0x34, 0x72, 0xf9, 0x45, 0xa5, 0xe6, 0xbd, 0x62,
    0x8c, 0x7a, 0x58, 0x2b, 0xcf, 0x8f, 0x89, 0x98,
    0x70, 0x59, 0x6a, 0x58, 0xda, 0xb8, 0x3b, 0x51,
    0xa5, 0x0c, 0x7d, 0xbb, 0x4f, 0x3e, 0x6e, 0x76,
};

static const uint8_t TC8_CHACHA20_BLOCK0[64] = {
    0x82, 0x6a, 0xbd, 0xd8, 0x44, 0x60, 0xe2, 0xe9,
    0x34, 0x9f, 0x0e, 0xf4, 0xaf, 0x5b, 0x17, 0x9b,
    0x42, 0x6e, 0x4b, 0x2d, 0x10, 0x9a, 0x9c, 0x5b,
    0xb4, 0x40, 0x00, 0xae, 0x51, 0xbe, 0xa9, 0x0a,
    0x49, 0x6b, 0xee, 0xef, 0x62, 0xa7, 0x68, 0x50,
    0xff, 0x3f, 0x04, 0x02, 0xc4, 0xdd, 0xc9, 0x9f,
    0x6d, 0xb0, 0x7f, 0x15, 0x1c, 0x1c, 0x0d, 0xfa,
    0xc2, 0xe5, 0x65, 0x65, 0xd6, 0x28, 0x96, 0x25,
};

static const uint8_t TC8_CHACHA20_BLOCK1[64] = {
    0x5b, 0x23, 0x13, 0x2e, 0x7b, 0x46, 0x9c, 0x7b,
    0xfb, 0x88, 0xfa, 0x95, 0xd4, 0x4c, 0xa5, 0xae,
    0x3e, 0x45, 0xe8, 0x48, 0xa4, 0x10, 0x8e, 0x98,
    0xba, 0xd7, 0xa9, 0xeb, 0x15, 0x51, 0x27, 0x84,
    0xa6, 0xa9, 0xe6, 0xe5, 0x91, 0xdc, 0xe6, 0x74,
    0x12, 0x0a, 0xca, 0xf9, 0x04, 0x0f, 0xf5, 0x0f,
    0xf3, 0xac, 0x30, 0xcc, 0xfb, 0x5e, 0x14, 0x20,
    0x4f, 0x5e, 0x42, 0x68, 0xb9, 0x0a, 0x88, 0x04,
};

static void _test_crypto_chacha(unsigned rounds, unsigned keylen,
                                const uint8_t key[32], const uint8_t iv[8],
                                const uint32_t after_init[16],
                                const uint8_t block0[64], const uint8_t block1[64])
{
    chacha_ctx ctx;
    uint8_t block[64];

    TEST_ASSERT_EQUAL_INT(0, chacha_init(&ctx, rounds, key, keylen, iv));
    TEST_ASSERT_EQUAL_INT(0, memcmp(ctx.state, after_init, 64));

    chacha_keystream_bytes(&ctx, block);
    TEST_ASSERT_EQUAL_INT(0, memcmp(block, block0, 64));

    chacha_keystream_bytes(&ctx, block);
    TEST_ASSERT_EQUAL_INT(0, memcmp(block, block1, 64));
}

static void test_crypto_chacha8_tc8(void)
{
    _test_crypto_chacha(8,  16, TC8_KEY, TC8_IV, TC8_AFTER_INIT,
                        TC8_CHACHA8_BLOCK0, TC8_CHACHA8_BLOCK1);
}

static void test_crypto_chacha12_tc8(void)
{
    _test_crypto_chacha(12, 16, TC8_KEY, TC8_IV, TC8_AFTER_INIT,
                        TC8_CHACHA12_BLOCK0, TC8_CHACHA12_BLOCK1);
}

static void test_crypto_chacha20_tc8(void)
{
    _test_crypto_chacha(20, 16, TC8_KEY, TC8_IV, TC8_AFTER_INIT,
                        TC8_CHACHA20_BLOCK0, TC8_CHACHA20_BLOCK1);
}

Test *tests_crypto_chacha_tests(void)
{
    EMB_UNIT_TESTFIXTURES(fixtures) {
        new_TestFixture(test_crypto_chacha8_tc8),
        new_TestFixture(test_crypto_chacha12_tc8),
        new_TestFixture(test_crypto_chacha20_tc8),
    };
    EMB_UNIT_TESTCALLER(crypto_chacha_tests, NULL, NULL, fixtures);
    return (Test *) &crypto_chacha_tests;
}