Add support for TEA (Tiny Encryption Algorithm)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Vesselin Bontchev
Michael Niedermayer
parent
830d3a0ebe
commit
323ec6b5e2
@ -63,6 +63,7 @@ HEADERS = adler32.h \
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twofish.h \
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version.h \
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xtea.h \
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tea.h \
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HEADERS-$(CONFIG_LZO) += lzo.h
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@ -135,6 +136,7 @@ OBJS = adler32.o \
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utils.o \
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xga_font_data.o \
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xtea.o \
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tea.o \
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OBJS-$(!HAVE_ATOMICS_NATIVE) += atomic.o \
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@ -192,6 +194,7 @@ TESTPROGS = adler32 \
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twofish \
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utf8 \
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xtea \
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tea \
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TESTPROGS-$(HAVE_LZO1X_999_COMPRESS) += lzo
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213
libavutil/tea.c
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213
libavutil/tea.c
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@ -0,0 +1,213 @@
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/*
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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 "avutil.h"
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#include "common.h"
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#include "intreadwrite.h"
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#include "tea.h"
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typedef struct AVTEA {
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uint32_t key[16];
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int rounds;
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} AVTEA;
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struct AVTEA *av_tea_alloc(void)
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{
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return av_mallocz(sizeof(struct AVTEA));
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}
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const int av_tea_size = sizeof(AVTEA);
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void av_tea_init(AVTEA *ctx, const uint8_t key[16], int rounds)
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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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ctx->rounds = rounds;
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}
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static void tea_crypt_ecb(AVTEA *ctx, uint8_t *dst, const uint8_t *src,
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int decrypt, uint8_t *iv)
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{
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uint32_t v0, v1;
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int rounds = ctx->rounds;
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uint32_t k0, k1, k2, k3;
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k0 = ctx->key[0];
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k1 = ctx->key[1];
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k2 = ctx->key[2];
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k3 = ctx->key[3];
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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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int i;
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uint32_t delta = 0x9E3779B9U, sum = delta * (rounds / 2);
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for (i = 0; i < rounds / 2; i++) {
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v1 -= ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
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v0 -= ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1);
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sum -= delta;
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}
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if (iv) {
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v0 ^= AV_RB32(iv);
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v1 ^= AV_RB32(iv + 4);
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memcpy(iv, src, 8);
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}
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} else {
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int i;
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uint32_t sum = 0, delta = 0x9E3779B9U;
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for (i = 0; i < rounds / 2; i++) {
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sum += delta;
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v0 += ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1);
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v1 += ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
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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_tea_crypt(AVTEA *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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if (decrypt) {
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while (count--) {
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tea_crypt_ecb(ctx, dst, src, decrypt, iv);
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src += 8;
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dst += 8;
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}
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} else {
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while (count--) {
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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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tea_crypt_ecb(ctx, dst, dst, decrypt, NULL);
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memcpy(iv, dst, 8);
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} else {
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tea_crypt_ecb(ctx, dst, src, decrypt, NULL);
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}
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src += 8;
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dst += 8;
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}
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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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#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(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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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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#endif
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71
libavutil/tea.h
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71
libavutil/tea.h
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@ -0,0 +1,71 @@
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/*
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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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* 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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#ifndef AVUTIL_TEA_H
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#define AVUTIL_TEA_H
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#include <stdint.h>
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/**
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* @file
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* @brief Public header for libavutil TEA algorithm
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* @defgroup lavu_tea TEA
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* @ingroup lavu_crypto
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* @{
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*/
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extern const int av_tea_size;
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struct AVTEA;
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/**
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* Allocate an AVTEA context
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* To free the struct: av_free(ptr)
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*/
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struct AVTEA *av_tea_alloc(void);
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/**
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* Initialize an AVTEA context.
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*
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* @param ctx an AVTEA context
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* @param key a key of 16 bytes used for encryption/decryption
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* @param rounds the number of rounds in TEA (64 is the "standard")
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*/
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void av_tea_init(struct AVTEA *ctx, const uint8_t key[16], int rounds);
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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 ctx an AVTEA 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_tea_crypt(struct AVTEA *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_TEA_H */
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@ -121,6 +121,10 @@ 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-tea
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fate-tea: libavutil/tea-test$(EXESUF)
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fate-tea: CMD = run libavutil/tea-test
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FATE_LIBAVUTIL += fate-opt
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fate-opt: libavutil/opt-test$(EXESUF)
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fate-opt: CMD = run libavutil/opt-test
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1
tests/ref/fate/tea
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1
tests/ref/fate/tea
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@ -0,0 +1 @@
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Test encryption/decryption success.
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