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https://github.com/FFmpeg/FFmpeg.git
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Add XTEA encryption support in libavutil
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Samuel Pitoiset
Martin Storsjö
parent
bc3dbcc8e5
commit
8c14f7a593
@ -38,6 +38,7 @@ HEADERS = adler32.h \
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samplefmt.h \
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sha.h \
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time.h \
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xtea.h \
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ARCH_HEADERS = bswap.h \
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intmath.h \
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@ -83,6 +84,7 @@ OBJS = adler32.o \
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time.o \
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tree.o \
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utils.o \
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xtea.o \
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TESTPROGS = adler32 \
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aes \
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@ -101,3 +103,4 @@ TESTPROGS = adler32 \
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parseutils \
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sha \
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tree \
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xtea \
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@ -152,7 +152,7 @@
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*/
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#define LIBAVUTIL_VERSION_MAJOR 51
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#define LIBAVUTIL_VERSION_MINOR 35
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#define LIBAVUTIL_VERSION_MINOR 36
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#define LIBAVUTIL_VERSION_MICRO 0
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#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
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165
libavutil/xtea.c
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165
libavutil/xtea.c
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@ -0,0 +1,165 @@
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/*
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* A 32-bit implementation of the XTEA algorithm
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* Copyright (c) 2012 Samuel Pitoiset
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*
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* loosely based on the implementation of David Wheeler and Roger Needham
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavutil/intreadwrite.h"
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#include "avutil.h"
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#include "common.h"
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#include "xtea.h"
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void av_xtea_init(AVXTEA *ctx, const uint8_t key[16])
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{
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int i;
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for (i = 0; i < 4; i++)
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ctx->key[i] = AV_RB32(key + (i << 2));
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}
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static void xtea_crypt_ecb(AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
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int decrypt)
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{
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uint32_t v0, v1;
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int i;
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v0 = AV_RB32(src);
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v1 = AV_RB32(src + 4);
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if (decrypt) {
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uint32_t delta = 0x9E3779B9, sum = delta * 32;
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for (i = 0; i < 32; i++) {
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v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + ctx->key[(sum >> 11) & 3]);
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sum -= delta;
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v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + ctx->key[sum & 3]);
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}
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} else {
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uint32_t sum = 0, delta = 0x9E3779B9;
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for (i = 0; i < 32; i++) {
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v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + ctx->key[sum & 3]);
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sum += delta;
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v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + ctx->key[(sum >> 11) & 3]);
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}
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}
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AV_WB32(dst, v0);
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AV_WB32(dst + 4, v1);
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}
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void av_xtea_crypt(AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int count,
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uint8_t *iv, int decrypt)
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{
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int i;
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while (count > 0) {
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if (decrypt) {
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xtea_crypt_ecb(ctx, dst, src, decrypt);
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if (iv) {
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for (i = 0; i < 8; i++)
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dst[i] = dst[i] ^ iv[i];
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memcpy(iv, src, 8);
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}
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} else {
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if (iv) {
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for (i = 0; i < 8; i++)
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dst[i] = src[i] ^ iv[i];
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xtea_crypt_ecb(ctx, dst, dst, decrypt);
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memcpy(iv, dst, 8);
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} else {
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xtea_crypt_ecb(ctx, dst, src, decrypt);
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}
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}
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src += 8;
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dst += 8;
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count -= 8;
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}
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}
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#ifdef TEST
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#include <stdio.h>
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#undef printf
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#define XTEA_NUM_TESTS 6
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static const uint8_t xtea_test_key[XTEA_NUM_TESTS][16] = {
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{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
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{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
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{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
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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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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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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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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
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};
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static const uint8_t xtea_test_pt[XTEA_NUM_TESTS][8] = {
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{ 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
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{ 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
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{ 0x5a, 0x5b, 0x6e, 0x27, 0x89, 0x48, 0xd7, 0x7f },
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{ 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
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{ 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
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{ 0x70, 0xe1, 0x22, 0x5d, 0x6e, 0x4e, 0x76, 0x55 }
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};
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static const uint8_t xtea_test_ct[XTEA_NUM_TESTS][8] = {
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{ 0x49, 0x7d, 0xf3, 0xd0, 0x72, 0x61, 0x2c, 0xb5 },
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{ 0xe7, 0x8f, 0x2d, 0x13, 0x74, 0x43, 0x41, 0xd8 },
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{ 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
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{ 0xa0, 0x39, 0x05, 0x89, 0xf8, 0xb8, 0xef, 0xa5 },
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{ 0xed, 0x23, 0x37, 0x5a, 0x82, 0x1a, 0x8c, 0x2d },
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{ 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 }
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};
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int main(void)
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{
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AVXTEA ctx;
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uint8_t buf[8];
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int i;
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for (i = 0; i < XTEA_NUM_TESTS; i++) {
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av_xtea_init(&ctx, xtea_test_key[i]);
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av_xtea_crypt(&ctx, buf, xtea_test_pt[i], 1, NULL, 0);
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if (memcmp(buf, xtea_test_ct[i], 8)) {
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printf("Test encryption failed.\n");
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return 1;
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}
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av_xtea_crypt(&ctx, buf, xtea_test_ct[i], 1, NULL, 1);
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if (memcmp(buf, xtea_test_pt[i], 8)) {
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printf("Test decryption failed.\n");
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return 1;
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}
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}
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printf("Test encryption/decryption success.\n");
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return 0;
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}
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#endif
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61
libavutil/xtea.h
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61
libavutil/xtea.h
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@ -0,0 +1,61 @@
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/*
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* A 32-bit implementation of the XTEA algorithm
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#ifndef AVUTIL_XTEA_H
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#define AVUTIL_XTEA_H
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#include <stdint.h>
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/**
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* @defgroup lavu_xtea XTEA
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* @ingroup lavu_crypto
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* @{
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*/
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typedef struct AVXTEA {
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uint32_t key[16];
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} AVXTEA;
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/**
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* Initialize an AVXTEA context.
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*
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* @param x an AVXTEA context
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* @param key a key of 16 bytes used for encryption/decryption
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*/
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void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
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/**
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* Encrypt or decrypt a buffer using a previously initialized context.
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*
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* @param x an AVXTEA context
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* @param dst destination array, can be equal to src
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* @param src source array, can be equal to dst
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* @param count number of 8 byte blocks
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* @param iv initialization vector for CBC mode, if NULL then ECB will be used
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* @param decrypt 0 for encryption, 1 for decryption
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*/
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void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
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int count, uint8_t *iv, int decrypt);
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/**
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* @}
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*/
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#endif /* AVUTIL_XTEA_H */
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@ -41,4 +41,8 @@ FATE_LIBAVUTIL += fate-sha
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fate-sha: libavutil/sha-test$(EXESUF)
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fate-sha: CMD = run libavutil/sha-test
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FATE_LIBAVUTIL += fate-xtea
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fate-xtea: libavutil/xtea-test$(EXESUF)
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fate-xtea: CMD = run libavutil/xtea-test
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fate-libavutil: $(FATE_LIBAVUTIL)
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1
tests/ref/fate/xtea
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1
tests/ref/fate/xtea
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@ -0,0 +1 @@
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Test encryption/decryption success.
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