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Diffstat (limited to 'ffmpeg/libavutil/xtea.c')
| -rw-r--r-- | ffmpeg/libavutil/xtea.c | 280 |
1 files changed, 0 insertions, 280 deletions
diff --git a/ffmpeg/libavutil/xtea.c b/ffmpeg/libavutil/xtea.c deleted file mode 100644 index 1750cbc..0000000 --- a/ffmpeg/libavutil/xtea.c +++ /dev/null @@ -1,280 +0,0 @@ -/* - * A 32-bit implementation of the XTEA algorithm - * Copyright (c) 2012 Samuel Pitoiset - * - * loosely based on the implementation of David Wheeler and Roger Needham - * - * 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 - */ - -/** - * @file - * @brief XTEA 32-bit implementation - * @author Samuel Pitoiset - * @ingroup lavu_xtea - */ - -#include "avutil.h" -#include "common.h" -#include "intreadwrite.h" -#include "xtea.h" - -void av_xtea_init(AVXTEA *ctx, const uint8_t key[16]) -{ - int i; - - for (i = 0; i < 4; i++) - ctx->key[i] = AV_RB32(key + (i << 2)); -} - -static void xtea_crypt_ecb(AVXTEA *ctx, uint8_t *dst, const uint8_t *src, - int decrypt, uint8_t *iv) -{ - uint32_t v0, v1; -#if !CONFIG_SMALL - uint32_t k0 = ctx->key[0]; - uint32_t k1 = ctx->key[1]; - uint32_t k2 = ctx->key[2]; - uint32_t k3 = ctx->key[3]; -#endif - - v0 = AV_RB32(src); - v1 = AV_RB32(src + 4); - - if (decrypt) { -#if CONFIG_SMALL - int i; - uint32_t delta = 0x9E3779B9U, sum = delta * 32; - - for (i = 0; i < 32; i++) { - v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + ctx->key[(sum >> 11) & 3]); - sum -= delta; - v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + ctx->key[sum & 3]); - } -#else -#define DSTEP(SUM, K0, K1) \ - v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (SUM + K0); \ - v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (SUM - 0x9E3779B9U + K1) - - DSTEP(0xC6EF3720U, k2, k3); - DSTEP(0x28B7BD67U, k3, k2); - DSTEP(0x8A8043AEU, k0, k1); - DSTEP(0xEC48C9F5U, k1, k0); - DSTEP(0x4E11503CU, k2, k3); - DSTEP(0xAFD9D683U, k2, k2); - DSTEP(0x11A25CCAU, k3, k1); - DSTEP(0x736AE311U, k0, k0); - DSTEP(0xD5336958U, k1, k3); - DSTEP(0x36FBEF9FU, k1, k2); - DSTEP(0x98C475E6U, k2, k1); - DSTEP(0xFA8CFC2DU, k3, k0); - DSTEP(0x5C558274U, k0, k3); - DSTEP(0xBE1E08BBU, k1, k2); - DSTEP(0x1FE68F02U, k1, k1); - DSTEP(0x81AF1549U, k2, k0); - DSTEP(0xE3779B90U, k3, k3); - DSTEP(0x454021D7U, k0, k2); - DSTEP(0xA708A81EU, k1, k1); - DSTEP(0x08D12E65U, k1, k0); - DSTEP(0x6A99B4ACU, k2, k3); - DSTEP(0xCC623AF3U, k3, k2); - DSTEP(0x2E2AC13AU, k0, k1); - DSTEP(0x8FF34781U, k0, k0); - DSTEP(0xF1BBCDC8U, k1, k3); - DSTEP(0x5384540FU, k2, k2); - DSTEP(0xB54CDA56U, k3, k1); - DSTEP(0x1715609DU, k0, k0); - DSTEP(0x78DDE6E4U, k0, k3); - DSTEP(0xDAA66D2BU, k1, k2); - DSTEP(0x3C6EF372U, k2, k1); - DSTEP(0x9E3779B9U, k3, k0); -#endif - if (iv) { - v0 ^= AV_RB32(iv); - v1 ^= AV_RB32(iv + 4); - memcpy(iv, src, 8); - } - } else { -#if CONFIG_SMALL - int i; - uint32_t sum = 0, delta = 0x9E3779B9U; - - for (i = 0; i < 32; i++) { - v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + ctx->key[sum & 3]); - sum += delta; - v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + ctx->key[(sum >> 11) & 3]); - } -#else -#define ESTEP(SUM, K0, K1) \ - v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (SUM + K0);\ - v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (SUM + 0x9E3779B9U + K1) - ESTEP(0x00000000U, k0, k3); - ESTEP(0x9E3779B9U, k1, k2); - ESTEP(0x3C6EF372U, k2, k1); - ESTEP(0xDAA66D2BU, k3, k0); - ESTEP(0x78DDE6E4U, k0, k0); - ESTEP(0x1715609DU, k1, k3); - ESTEP(0xB54CDA56U, k2, k2); - ESTEP(0x5384540FU, k3, k1); - ESTEP(0xF1BBCDC8U, k0, k0); - ESTEP(0x8FF34781U, k1, k0); - ESTEP(0x2E2AC13AU, k2, k3); - ESTEP(0xCC623AF3U, k3, k2); - ESTEP(0x6A99B4ACU, k0, k1); - ESTEP(0x08D12E65U, k1, k1); - ESTEP(0xA708A81EU, k2, k0); - ESTEP(0x454021D7U, k3, k3); - ESTEP(0xE3779B90U, k0, k2); - ESTEP(0x81AF1549U, k1, k1); - ESTEP(0x1FE68F02U, k2, k1); - ESTEP(0xBE1E08BBU, k3, k0); - ESTEP(0x5C558274U, k0, k3); - ESTEP(0xFA8CFC2DU, k1, k2); - ESTEP(0x98C475E6U, k2, k1); - ESTEP(0x36FBEF9FU, k3, k1); - ESTEP(0xD5336958U, k0, k0); - ESTEP(0x736AE311U, k1, k3); - ESTEP(0x11A25CCAU, k2, k2); - ESTEP(0xAFD9D683U, k3, k2); - ESTEP(0x4E11503CU, k0, k1); - ESTEP(0xEC48C9F5U, k1, k0); - ESTEP(0x8A8043AEU, k2, k3); - ESTEP(0x28B7BD67U, k3, k2); -#endif - } - - AV_WB32(dst, v0); - AV_WB32(dst + 4, v1); -} - -void av_xtea_crypt(AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int count, - uint8_t *iv, int decrypt) -{ - int i; - - if (decrypt) { - while (count--) { - xtea_crypt_ecb(ctx, dst, src, decrypt, iv); - - src += 8; - dst += 8; - } - } else { - while (count--) { - if (iv) { - for (i = 0; i < 8; i++) - dst[i] = src[i] ^ iv[i]; - xtea_crypt_ecb(ctx, dst, dst, decrypt, NULL); - memcpy(iv, dst, 8); - } else { - xtea_crypt_ecb(ctx, dst, src, decrypt, NULL); - } - src += 8; - dst += 8; - } - } -} - -#ifdef TEST -#include <stdio.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) -{ - av_xtea_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) -{ - AVXTEA ctx; - uint8_t buf[8], iv[8]; - int i; - static const uint8_t src[32] = "HelloWorldHelloWorldHelloWorld"; - uint8_t ct[32]; - uint8_t pl[32]; - - 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"); - test_xtea(&ctx, buf, xtea_test_ct[i], xtea_test_pt[i], 1, NULL, 1, "decryption"); - - /* 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"); - - memcpy(iv, "HALLO123", 8); - test_xtea(&ctx, ct, ct, src, 4, iv, 1, "CBC inplace decryption"); - } - - printf("Test encryption/decryption success.\n"); - - return 0; -} - -#endif |