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https://git.ffmpeg.org/ffmpeg.git
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7d8e19a5c4
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: James Almer <jamrial@gmail.com>
116 lines
3.7 KiB
C
116 lines
3.7 KiB
C
/*
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* A 32-bit implementation of the TEA algorithm
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* Copyright (c) 2015 Vesselin Bontchev
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*
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* Loosely based on the implementation of David Wheeler and Roger Needham,
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* https://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm#Reference_code
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include "common.h"
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#include "tea.h"
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#define TEA_NUM_TESTS 4
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// https://github.com/logandrews/TeaCrypt/blob/master/tea/tea_test.go
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static const uint8_t tea_test_key[TEA_NUM_TESTS][16] = {
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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},
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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},
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{ 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
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0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF
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},
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{ 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
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0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF
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}
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};
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static const uint8_t tea_test_pt[TEA_NUM_TESTS][8] = {
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 },
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{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 },
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{ 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF }
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};
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static const uint8_t tea_test_ct[TEA_NUM_TESTS][8] = {
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{ 0x41, 0xEA, 0x3A, 0x0A, 0x94, 0xBA, 0xA9, 0x40 },
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{ 0x6A, 0x2F, 0x9C, 0xF3, 0xFC, 0xCF, 0x3C, 0x55 },
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{ 0xDE, 0xB1, 0xC0, 0xA2, 0x7E, 0x74, 0x5D, 0xB3 },
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{ 0x12, 0x6C, 0x6B, 0x92, 0xC0, 0x65, 0x3A, 0x3E }
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};
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static void test_tea(struct AVTEA *ctx, uint8_t *dst, const uint8_t *src,
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const uint8_t *ref, int len, uint8_t *iv, int dir,
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const char *test)
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{
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av_tea_crypt(ctx, dst, src, len, iv, dir);
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if (memcmp(dst, ref, 8*len)) {
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int i;
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printf("%s failed\ngot ", test);
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for (i = 0; i < 8*len; i++)
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printf("%02x ", dst[i]);
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printf("\nexpected ");
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for (i = 0; i < 8*len; i++)
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printf("%02x ", ref[i]);
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printf("\n");
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exit(1);
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}
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}
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int main(void)
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{
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struct AVTEA *ctx;
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uint8_t buf[8], iv[8];
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int i;
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static const uint8_t src[32] = "HelloWorldHelloWorldHelloWorld";
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uint8_t ct[32];
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uint8_t pl[32];
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ctx = av_tea_alloc();
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if (!ctx)
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return 1;
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for (i = 0; i < TEA_NUM_TESTS; i++) {
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av_tea_init(ctx, tea_test_key[i], 64);
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test_tea(ctx, buf, tea_test_pt[i], tea_test_ct[i], 1, NULL, 0, "encryption");
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test_tea(ctx, buf, tea_test_ct[i], tea_test_pt[i], 1, NULL, 1, "decryption");
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/* encrypt */
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memcpy(iv, "HALLO123", 8);
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av_tea_crypt(ctx, ct, src, 4, iv, 0);
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/* decrypt into pl */
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memcpy(iv, "HALLO123", 8);
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test_tea(ctx, pl, ct, src, 4, iv, 1, "CBC decryption");
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memcpy(iv, "HALLO123", 8);
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test_tea(ctx, ct, ct, src, 4, iv, 1, "CBC inplace decryption");
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}
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printf("Test encryption/decryption success.\n");
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av_free(ctx);
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return 0;
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}
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