/*
 * Copyright 2006-2017 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <openssl/crypto.h>
#include <openssl/aes.h>
#include <openssl/rand.h>
#include <stdio.h>
#include <string.h>
#include "internal/nelem.h"
#include "testutil.h"

#define TEST_SIZE       128
#define BIG_TEST_SIZE 10240

#if BIG_TEST_SIZE < TEST_SIZE
#error BIG_TEST_SIZE is smaller than TEST_SIZE
#endif

static unsigned char rkey[16];
static unsigned char rkey2[16];
static unsigned char plaintext[BIG_TEST_SIZE];
static unsigned char saved_iv[AES_BLOCK_SIZE * 4];

#define MAX_VECTOR_SIZE 64

struct ige_test {
    const unsigned char key[16];
    const unsigned char iv[32];
    const unsigned char in[MAX_VECTOR_SIZE];
    const unsigned char out[MAX_VECTOR_SIZE];
    const size_t length;
    const int encrypt;
};

static struct ige_test const ige_test_vectors[] = {
    {{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
      0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f}, /* key */
     {0x00, 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}, /* iv */
     {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* in */
     {0x1a, 0x85, 0x19, 0xa6, 0x55, 0x7b, 0xe6, 0x52,
      0xe9, 0xda, 0x8e, 0x43, 0xda, 0x4e, 0xf4, 0x45,
      0x3c, 0xf4, 0x56, 0xb4, 0xca, 0x48, 0x8a, 0xa3,
      0x83, 0xc7, 0x9c, 0x98, 0xb3, 0x47, 0x97, 0xcb}, /* out */
     32, AES_ENCRYPT},          /* test vector 0 */

    {{0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20,
      0x61, 0x6e, 0x20, 0x69, 0x6d, 0x70, 0x6c, 0x65}, /* key */
     {0x6d, 0x65, 0x6e, 0x74, 0x61, 0x74, 0x69, 0x6f,
      0x6e, 0x20, 0x6f, 0x66, 0x20, 0x49, 0x47, 0x45,
      0x20, 0x6d, 0x6f, 0x64, 0x65, 0x20, 0x66, 0x6f,
      0x72, 0x20, 0x4f, 0x70, 0x65, 0x6e, 0x53, 0x53}, /* iv */
     {0x4c, 0x2e, 0x20, 0x4c, 0x65, 0x74, 0x27, 0x73,
      0x20, 0x68, 0x6f, 0x70, 0x65, 0x20, 0x42, 0x65,
      0x6e, 0x20, 0x67, 0x6f, 0x74, 0x20, 0x69, 0x74,
      0x20, 0x72, 0x69, 0x67, 0x68, 0x74, 0x21, 0x0a}, /* in */
     {0x99, 0x70, 0x64, 0x87, 0xa1, 0xcd, 0xe6, 0x13,
      0xbc, 0x6d, 0xe0, 0xb6, 0xf2, 0x4b, 0x1c, 0x7a,
      0xa4, 0x48, 0xc8, 0xb9, 0xc3, 0x40, 0x3e, 0x34,
      0x67, 0xa8, 0xca, 0xd8, 0x93, 0x40, 0xf5, 0x3b}, /* out */
     32, AES_DECRYPT},          /* test vector 1 */
};

struct bi_ige_test {
    const unsigned char key1[32];
    const unsigned char key2[32];
    const unsigned char iv[64];
    const unsigned char in[MAX_VECTOR_SIZE];
    const unsigned char out[MAX_VECTOR_SIZE];
    const size_t keysize;
    const size_t length;
    const int encrypt;
};

static struct bi_ige_test const bi_ige_test_vectors[] = {
    {{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
      0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f}, /* key1 */
     {0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
      0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f}, /* key2 */
     {0x00, 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, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
      0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
      0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
      0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f}, /* iv */
     {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* in */
     {0x14, 0x40, 0x6f, 0xae, 0xa2, 0x79, 0xf2, 0x56,
      0x1f, 0x86, 0xeb, 0x3b, 0x7d, 0xff, 0x53, 0xdc,
      0x4e, 0x27, 0x0c, 0x03, 0xde, 0x7c, 0xe5, 0x16,
      0x6a, 0x9c, 0x20, 0x33, 0x9d, 0x33, 0xfe, 0x12}, /* out */
     16, 32, AES_ENCRYPT},      /* test vector 0 */
    {{0x58, 0x0a, 0x06, 0xe9, 0x97, 0x07, 0x59, 0x5c,
      0x9e, 0x19, 0xd2, 0xa7, 0xbb, 0x40, 0x2b, 0x7a,
      0xc7, 0xd8, 0x11, 0x9e, 0x4c, 0x51, 0x35, 0x75,
      0x64, 0x28, 0x0f, 0x23, 0xad, 0x74, 0xac, 0x37}, /* key1 */
     {0xd1, 0x80, 0xa0, 0x31, 0x47, 0xa3, 0x11, 0x13,
      0x86, 0x26, 0x9e, 0x6d, 0xff, 0xaf, 0x72, 0x74,
      0x5b, 0xa2, 0x35, 0x81, 0xd2, 0xa6, 0x3d, 0x21,
      0x67, 0x7b, 0x58, 0xa8, 0x18, 0xf9, 0x72, 0xe4}, /* key2 */
     {0x80, 0x3d, 0xbd, 0x4c, 0xe6, 0x7b, 0x06, 0xa9,
      0x53, 0x35, 0xd5, 0x7e, 0x71, 0xc1, 0x70, 0x70,
      0x74, 0x9a, 0x00, 0x28, 0x0c, 0xbf, 0x6c, 0x42,
      0x9b, 0xa4, 0xdd, 0x65, 0x11, 0x77, 0x7c, 0x67,
      0xfe, 0x76, 0x0a, 0xf0, 0xd5, 0xc6, 0x6e, 0x6a,
      0xe7, 0x5e, 0x4c, 0xf2, 0x7e, 0x9e, 0xf9, 0x20,
      0x0e, 0x54, 0x6f, 0x2d, 0x8a, 0x8d, 0x7e, 0xbd,
      0x48, 0x79, 0x37, 0x99, 0xff, 0x27, 0x93, 0xa3}, /* iv */
     {0xf1, 0x54, 0x3d, 0xca, 0xfe, 0xb5, 0xef, 0x1c,
      0x4f, 0xa6, 0x43, 0xf6, 0xe6, 0x48, 0x57, 0xf0,
      0xee, 0x15, 0x7f, 0xe3, 0xe7, 0x2f, 0xd0, 0x2f,
      0x11, 0x95, 0x7a, 0x17, 0x00, 0xab, 0xa7, 0x0b,
      0xbe, 0x44, 0x09, 0x9c, 0xcd, 0xac, 0xa8, 0x52,
      0xa1, 0x8e, 0x7b, 0x75, 0xbc, 0xa4, 0x92, 0x5a,
      0xab, 0x46, 0xd3, 0x3a, 0xa0, 0xd5, 0x35, 0x1c,
      0x55, 0xa4, 0xb3, 0xa8, 0x40, 0x81, 0xa5, 0x0b}, /* in */
     {0x42, 0xe5, 0x28, 0x30, 0x31, 0xc2, 0xa0, 0x23,
      0x68, 0x49, 0x4e, 0xb3, 0x24, 0x59, 0x92, 0x79,
      0xc1, 0xa5, 0xcc, 0xe6, 0x76, 0x53, 0xb1, 0xcf,
      0x20, 0x86, 0x23, 0xe8, 0x72, 0x55, 0x99, 0x92,
      0x0d, 0x16, 0x1c, 0x5a, 0x2f, 0xce, 0xcb, 0x51,
      0xe2, 0x67, 0xfa, 0x10, 0xec, 0xcd, 0x3d, 0x67,
      0xa5, 0xe6, 0xf7, 0x31, 0x26, 0xb0, 0x0d, 0x76,
      0x5e, 0x28, 0xdc, 0x7f, 0x01, 0xc5, 0xa5, 0x4c}, /* out */
     32, 64, AES_ENCRYPT},      /* test vector 1 */

};

static int test_ige_vectors(int n)
{
    const struct ige_test *const v = &ige_test_vectors[n];
    AES_KEY key;
    unsigned char buf[MAX_VECTOR_SIZE];
    unsigned char iv[AES_BLOCK_SIZE * 2];
    int testresult = 1;

    if (!TEST_int_le(v->length, MAX_VECTOR_SIZE))
        return 0;

    if (v->encrypt == AES_ENCRYPT)
        AES_set_encrypt_key(v->key, 8 * sizeof(v->key), &key);
    else
        AES_set_decrypt_key(v->key, 8 * sizeof(v->key), &key);
    memcpy(iv, v->iv, sizeof(iv));
    AES_ige_encrypt(v->in, buf, v->length, &key, iv, v->encrypt);

    if (!TEST_mem_eq(v->out, v->length, buf, v->length)) {
        TEST_info("IGE test vector %d failed", n);
        test_output_memory("key", v->key, sizeof(v->key));
        test_output_memory("iv", v->iv, sizeof(v->iv));
        test_output_memory("in", v->in, v->length);
        testresult = 0;
    }

    /* try with in == out */
    memcpy(iv, v->iv, sizeof(iv));
    memcpy(buf, v->in, v->length);
    AES_ige_encrypt(buf, buf, v->length, &key, iv, v->encrypt);

    if (!TEST_mem_eq(v->out, v->length, buf, v->length)) {
        TEST_info("IGE test vector %d failed (with in == out)", n);
        test_output_memory("key", v->key, sizeof(v->key));
        test_output_memory("iv", v->iv, sizeof(v->iv));
        test_output_memory("in", v->in, v->length);
        testresult = 0;
    }

    return testresult;
}

static int test_bi_ige_vectors(int n)
{
    const struct bi_ige_test *const v = &bi_ige_test_vectors[n];
    AES_KEY key1;
    AES_KEY key2;
    unsigned char buf[MAX_VECTOR_SIZE];

        if (!TEST_int_le(v->length, MAX_VECTOR_SIZE))
            return 0;

    if (v->encrypt == AES_ENCRYPT) {
        AES_set_encrypt_key(v->key1, 8 * v->keysize, &key1);
        AES_set_encrypt_key(v->key2, 8 * v->keysize, &key2);
    } else {
        AES_set_decrypt_key(v->key1, 8 * v->keysize, &key1);
        AES_set_decrypt_key(v->key2, 8 * v->keysize, &key2);
    }

    AES_bi_ige_encrypt(v->in, buf, v->length, &key1, &key2, v->iv,
                       v->encrypt);

    if (!TEST_mem_eq(v->out, v->length, buf, v->length)) {
        test_output_memory("key 1", v->key1, sizeof(v->key1));
        test_output_memory("key 2", v->key2, sizeof(v->key2));
        test_output_memory("iv", v->iv, sizeof(v->iv));
        test_output_memory("in", v->in, v->length);
        return 0;
    }

    return 1;
}

static int test_ige_enc_dec(void)
{
    AES_KEY key;
    unsigned char iv[AES_BLOCK_SIZE * 4];
    unsigned char ciphertext[BIG_TEST_SIZE];
    unsigned char checktext[BIG_TEST_SIZE];

    memcpy(iv, saved_iv, sizeof(iv));
    AES_set_encrypt_key(rkey, 8 * sizeof(rkey), &key);
    AES_ige_encrypt(plaintext, ciphertext, TEST_SIZE, &key, iv, AES_ENCRYPT);

    AES_set_decrypt_key(rkey, 8 * sizeof(rkey), &key);
    memcpy(iv, saved_iv, sizeof(iv));
    AES_ige_encrypt(ciphertext, checktext, TEST_SIZE, &key, iv, AES_DECRYPT);

    return TEST_mem_eq(checktext, TEST_SIZE, plaintext, TEST_SIZE);
}

static int test_ige_enc_chaining(void)
{
    AES_KEY key;
    unsigned char iv[AES_BLOCK_SIZE * 4];
    unsigned char ciphertext[BIG_TEST_SIZE];
    unsigned char checktext[BIG_TEST_SIZE];

    AES_set_encrypt_key(rkey, 8 * sizeof(rkey), &key);
    memcpy(iv, saved_iv, sizeof(iv));
    AES_ige_encrypt(plaintext, ciphertext, TEST_SIZE / 2, &key, iv,
                    AES_ENCRYPT);
    AES_ige_encrypt(plaintext + TEST_SIZE / 2,
                    ciphertext + TEST_SIZE / 2, TEST_SIZE / 2,
                    &key, iv, AES_ENCRYPT);

    AES_set_decrypt_key(rkey, 8 * sizeof(rkey), &key);
    memcpy(iv, saved_iv, sizeof(iv));
    AES_ige_encrypt(ciphertext, checktext, TEST_SIZE, &key, iv, AES_DECRYPT);

    return TEST_mem_eq(checktext, TEST_SIZE, plaintext, TEST_SIZE);
}

static int test_ige_dec_chaining(void)
{
    AES_KEY key;
    unsigned char iv[AES_BLOCK_SIZE * 4];
    unsigned char ciphertext[BIG_TEST_SIZE];
    unsigned char checktext[BIG_TEST_SIZE];

    AES_set_encrypt_key(rkey, 8 * sizeof(rkey), &key);
    memcpy(iv, saved_iv, sizeof(iv));
    AES_ige_encrypt(plaintext, ciphertext, TEST_SIZE / 2, &key, iv,
                    AES_ENCRYPT);
    AES_ige_encrypt(plaintext + TEST_SIZE / 2,
                    ciphertext + TEST_SIZE / 2, TEST_SIZE / 2,
                    &key, iv, AES_ENCRYPT);

    AES_set_decrypt_key(rkey, 8 * sizeof(rkey), &key);
    memcpy(iv, saved_iv, sizeof(iv));
    AES_ige_encrypt(ciphertext, checktext, TEST_SIZE / 2, &key, iv,
                    AES_DECRYPT);
    AES_ige_encrypt(ciphertext + TEST_SIZE / 2,
                    checktext + TEST_SIZE / 2, TEST_SIZE / 2, &key, iv,
                    AES_DECRYPT);

    return TEST_mem_eq(checktext, TEST_SIZE, plaintext, TEST_SIZE);
}

static int test_ige_garble_forwards(void)
{
    AES_KEY key;
    unsigned char iv[AES_BLOCK_SIZE * 4];
    unsigned char ciphertext[BIG_TEST_SIZE];
    unsigned char checktext[BIG_TEST_SIZE];
    unsigned int n;
    int testresult = 1;
    const size_t ctsize = sizeof(checktext);
    size_t matches;

    AES_set_encrypt_key(rkey, 8 * sizeof(rkey), &key);
    memcpy(iv, saved_iv, sizeof(iv));
    AES_ige_encrypt(plaintext, ciphertext, sizeof(plaintext), &key, iv,
                    AES_ENCRYPT);

    /* corrupt halfway through */
    ++ciphertext[sizeof(ciphertext) / 2];
    AES_set_decrypt_key(rkey, 8 * sizeof(rkey), &key);
    memcpy(iv, saved_iv, sizeof(iv));
    AES_ige_encrypt(ciphertext, checktext, sizeof(checktext), &key, iv,
                    AES_DECRYPT);

    matches = 0;
    for (n = 0; n < sizeof(checktext); ++n)
        if (checktext[n] == plaintext[n])
            ++matches;

    /* Fail if there is more than 51% matching bytes */
    if (!TEST_size_t_le(matches, ctsize / 2 + ctsize / 100))
        testresult = 0;

    /* Fail if the garble goes backwards */
    if (!TEST_size_t_gt(matches, ctsize / 2))
        testresult = 0;
    return testresult;
}

static int test_bi_ige_enc_dec(void)
{
    AES_KEY key, key2;
    unsigned char iv[AES_BLOCK_SIZE * 4];
    unsigned char ciphertext[BIG_TEST_SIZE];
    unsigned char checktext[BIG_TEST_SIZE];

    memcpy(iv, saved_iv, sizeof(iv));
    AES_set_encrypt_key(rkey, 8 * sizeof(rkey), &key);
    AES_set_encrypt_key(rkey2, 8 * sizeof(rkey2), &key2);
    AES_bi_ige_encrypt(plaintext, ciphertext, TEST_SIZE, &key, &key2, iv,
                       AES_ENCRYPT);

    AES_set_decrypt_key(rkey, 8 * sizeof(rkey), &key);
    AES_set_decrypt_key(rkey2, 8 * sizeof(rkey2), &key2);
    AES_bi_ige_encrypt(ciphertext, checktext, TEST_SIZE, &key, &key2, iv,
                       AES_DECRYPT);

    return TEST_mem_eq(checktext, TEST_SIZE, plaintext, TEST_SIZE);
}

static int test_bi_ige_garble1(void)
{
    AES_KEY key, key2;
    unsigned char iv[AES_BLOCK_SIZE * 4];
    unsigned char ciphertext[BIG_TEST_SIZE];
    unsigned char checktext[BIG_TEST_SIZE];
    unsigned int n;
    size_t matches;

    memcpy(iv, saved_iv, sizeof(iv));
    AES_set_encrypt_key(rkey, 8 * sizeof(rkey), &key);
    AES_set_encrypt_key(rkey2, 8 * sizeof(rkey2), &key2);
    AES_ige_encrypt(plaintext, ciphertext, sizeof(plaintext), &key, iv,
                    AES_ENCRYPT);

    /* corrupt halfway through */
    ++ciphertext[sizeof(ciphertext) / 2];
    AES_set_decrypt_key(rkey, 8 * sizeof(rkey), &key);
    AES_set_decrypt_key(rkey2, 8 * sizeof(rkey2), &key2);
    AES_ige_encrypt(ciphertext, checktext, sizeof(checktext), &key, iv,
                    AES_DECRYPT);

    matches = 0;
    for (n = 0; n < sizeof(checktext); ++n)
        if (checktext[n] == plaintext[n])
            ++matches;

    /* Fail if there is more than 1% matching bytes */
    return TEST_size_t_le(matches, sizeof(checktext) / 100);
}

static int test_bi_ige_garble2(void)
{
    AES_KEY key, key2;
    unsigned char iv[AES_BLOCK_SIZE * 4];
    unsigned char ciphertext[BIG_TEST_SIZE];
    unsigned char checktext[BIG_TEST_SIZE];
    unsigned int n;
    size_t matches;

    memcpy(iv, saved_iv, sizeof(iv));
    AES_set_encrypt_key(rkey, 8 * sizeof(rkey), &key);
    AES_set_encrypt_key(rkey2, 8 * sizeof(rkey2), &key2);
    AES_ige_encrypt(plaintext, ciphertext, sizeof(plaintext), &key, iv,
                    AES_ENCRYPT);

    /* corrupt right at the end */
    ++ciphertext[sizeof(ciphertext) - 1];
    AES_set_decrypt_key(rkey, 8 * sizeof(rkey), &key);
    AES_set_decrypt_key(rkey2, 8 * sizeof(rkey2), &key2);
    AES_ige_encrypt(ciphertext, checktext, sizeof(checktext), &key, iv,
                    AES_DECRYPT);

    matches = 0;
    for (n = 0; n < sizeof(checktext); ++n)
        if (checktext[n] == plaintext[n])
            ++matches;

    /* Fail if there is more than 1% matching bytes */
    return TEST_size_t_le(matches, sizeof(checktext) / 100);
}

static int test_bi_ige_garble3(void)
{
    AES_KEY key, key2;
    unsigned char iv[AES_BLOCK_SIZE * 4];
    unsigned char ciphertext[BIG_TEST_SIZE];
    unsigned char checktext[BIG_TEST_SIZE];
    unsigned int n;
    size_t matches;

    memcpy(iv, saved_iv, sizeof(iv));
    AES_set_encrypt_key(rkey, 8 * sizeof(rkey), &key);
    AES_set_encrypt_key(rkey2, 8 * sizeof(rkey2), &key2);
    AES_ige_encrypt(plaintext, ciphertext, sizeof(plaintext), &key, iv,
                    AES_ENCRYPT);

    /* corrupt right at the start */
    ++ciphertext[0];
    AES_set_decrypt_key(rkey, 8 * sizeof(rkey), &key);
    AES_set_decrypt_key(rkey2, 8 * sizeof(rkey2), &key2);
    AES_ige_encrypt(ciphertext, checktext, sizeof(checktext), &key, iv,
                    AES_DECRYPT);

    matches = 0;
    for (n = 0; n < sizeof(checktext); ++n)
        if (checktext[n] == plaintext[n])
            ++matches;

    /* Fail if there is more than 1% matching bytes */
    return TEST_size_t_le(matches, sizeof(checktext) / 100);
}

int setup_tests(void)
{
    RAND_bytes(rkey, sizeof(rkey));
    RAND_bytes(rkey2, sizeof(rkey2));
    RAND_bytes(plaintext, sizeof(plaintext));
    RAND_bytes(saved_iv, sizeof(saved_iv));

    ADD_TEST(test_ige_enc_dec);
    ADD_TEST(test_ige_enc_chaining);
    ADD_TEST(test_ige_dec_chaining);
    ADD_TEST(test_ige_garble_forwards);
    ADD_TEST(test_bi_ige_enc_dec);
    ADD_TEST(test_bi_ige_garble1);
    ADD_TEST(test_bi_ige_garble2);
    ADD_TEST(test_bi_ige_garble3);
    ADD_ALL_TESTS(test_ige_vectors, OSSL_NELEM(ige_test_vectors));
    ADD_ALL_TESTS(test_bi_ige_vectors, OSSL_NELEM(bi_ige_test_vectors));
    return 1;
}