xtea.c

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/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/xtea.h"
 
#define XTEA_NUM_TESTS 6
 
static const uint8_t xtea_test_key[XTEA_NUM_TESTS][16] = {
    { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
      0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
    { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
      0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
    { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
      0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
    { 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 },
    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
};
 
static const uint8_t xtea_test_pt[XTEA_NUM_TESTS][8] = {
    { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
    { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
    { 0x5a, 0x5b, 0x6e, 0x27, 0x89, 0x48, 0xd7, 0x7f },
    { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
    { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
    { 0x70, 0xe1, 0x22, 0x5d, 0x6e, 0x4e, 0x76, 0x55 }
};
 
static const uint8_t xtea_test_ct[XTEA_NUM_TESTS][8] = {
    { 0x49, 0x7d, 0xf3, 0xd0, 0x72, 0x61, 0x2c, 0xb5 },
    { 0xe7, 0x8f, 0x2d, 0x13, 0x74, 0x43, 0x41, 0xd8 },
    { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
    { 0xa0, 0x39, 0x05, 0x89, 0xf8, 0xb8, 0xef, 0xa5 },
    { 0xed, 0x23, 0x37, 0x5a, 0x82, 0x1a, 0x8c, 0x2d },
    { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 }
};
 
static void test_xtea(AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
                      const uint8_t *ref, int len, uint8_t *iv, int dir,
                      const char *test,
                      void (*crypt)(AVXTEA *, uint8_t *, const uint8_t *, int, uint8_t *, int))
{
    crypt(ctx, dst, src, len, iv, dir);
    if (memcmp(dst, ref, 8*len)) {
        int i;
        printf("%s failed\ngot      ", test);
        for (i = 0; i < 8*len; i++)
            printf("%02x ", dst[i]);
        printf("\nexpected ");
        for (i = 0; i < 8*len; i++)
            printf("%02x ", ref[i]);
        printf("\n");
        exit(1);
    }
}
 
int main(void)
{
    uint8_t buf[16], iv[8];
    int i, j;
    static const uint8_t src[32] = "HelloWorldHelloWorldHelloWorld";
    uint8_t ct[32];
    uint8_t pl[32];
    AVXTEA *ctx = av_xtea_alloc();
    if (!ctx)
        return 1;
 
    for (i = 0; i < XTEA_NUM_TESTS; i++) {
        av_xtea_init(ctx, xtea_test_key[i]);
 
        test_xtea(ctx, buf, xtea_test_pt[i], xtea_test_ct[i], 1, NULL, 0, "encryption", av_xtea_crypt);
        test_xtea(ctx, buf, xtea_test_ct[i], xtea_test_pt[i], 1, NULL, 1, "decryption", av_xtea_crypt);
 
        for (j = 0; j < 4; j++)
            AV_WL32(&buf[4*j], AV_RB32(&xtea_test_key[i][4*j]));
        av_xtea_le_init(ctx, buf);
        for (j = 0; j < 2; j++) {
            AV_WL32(&ct[4*j], AV_RB32(&xtea_test_ct[i][4*j]));
            AV_WL32(&pl[4*j], AV_RB32(&xtea_test_pt[i][4*j]));
        }
        test_xtea(ctx, buf, pl, ct, 1, NULL, 0, "encryption", av_xtea_le_crypt);
        test_xtea(ctx, buf, ct, pl, 1, NULL, 1, "decryption", av_xtea_le_crypt);
 
        /* encrypt */
        memcpy(iv, "HALLO123", 8);
        av_xtea_crypt(ctx, ct, src, 4, iv, 0);
 
        /* decrypt into pl */
        memcpy(iv, "HALLO123", 8);
        test_xtea(ctx, pl, ct, src, 4, iv, 1, "CBC decryption", av_xtea_crypt);
 
        memcpy(iv, "HALLO123", 8);
        test_xtea(ctx, ct, ct, src, 4, iv, 1, "CBC inplace decryption", av_xtea_crypt);
    }
 
    printf("Test encryption/decryption success.\n");
    av_free(ctx);
 
    return 0;
}