* DES encryption/decryption
* Copyright (c) 2007 Reimar Doeffinger
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <inttypes.h>
+#include "avutil.h"
#include "common.h"
+#include "intreadwrite.h"
#include "des.h"
+typedef struct AVDES AVDES;
+
#define T(a, b, c, d, e, f, g, h) 64-a,64-b,64-c,64-d,64-e,64-f,64-g,64-h
static const uint8_t IP_shuffle[] = {
T(58, 50, 42, 34, 26, 18, 10, 2),
};
#undef T
+#if CONFIG_SMALL || defined(GENTABLES)
#define T(a, b, c, d) 32-a,32-b,32-c,32-d
static const uint8_t P_shuffle[] = {
T(16, 7, 20, 21),
T(22, 11, 4, 25)
};
#undef T
+#endif
#define T(a, b, c, d, e, f, g) 64-a,64-b,64-c,64-d,64-e,64-f,64-g
static const uint8_t PC1_shuffle[] = {
}
/**
- * \brief rotate the two halves of the expanded 56 bit key each 1 bit left
+ * @brief rotate the two halves of the expanded 56 bit key each 1 bit left
*
* Note: the specification calls this "shift", so I kept it although
* it is confusing.
return CDn;
}
-uint64_t ff_des_encdec(uint64_t in, uint64_t key, int decrypt) {
+static void gen_roundkeys(uint64_t K[16], uint64_t key) {
int i;
- uint64_t K[16];
// discard parity bits from key and shuffle it into C and D parts
uint64_t CDn = shuffle(key, PC1_shuffle, sizeof(PC1_shuffle));
// generate round keys
CDn = key_shift_left(CDn);
K[i] = shuffle(CDn, PC2_shuffle, sizeof(PC2_shuffle));
}
+}
+
+static uint64_t des_encdec(uint64_t in, uint64_t K[16], int decrypt) {
+ int i;
// used to apply round keys in reverse order for decryption
decrypt = decrypt ? 15 : 0;
// shuffle irrelevant to security but to ease hardware implementations
return in;
}
+int av_des_init(AVDES *d, const uint8_t *key, int key_bits, int decrypt) {
+ if (key_bits != 64 && key_bits != 192)
+ return -1;
+ d->triple_des = key_bits > 64;
+ gen_roundkeys(d->round_keys[0], AV_RB64(key));
+ if (d->triple_des) {
+ gen_roundkeys(d->round_keys[1], AV_RB64(key + 8));
+ gen_roundkeys(d->round_keys[2], AV_RB64(key + 16));
+ }
+ return 0;
+}
+
+static void av_des_crypt_mac(AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt, int mac) {
+ uint64_t iv_val = iv ? AV_RB64(iv) : 0;
+ while (count-- > 0) {
+ uint64_t dst_val;
+ uint64_t src_val = src ? AV_RB64(src) : 0;
+ if (decrypt) {
+ uint64_t tmp = src_val;
+ if (d->triple_des) {
+ src_val = des_encdec(src_val, d->round_keys[2], 1);
+ src_val = des_encdec(src_val, d->round_keys[1], 0);
+ }
+ dst_val = des_encdec(src_val, d->round_keys[0], 1) ^ iv_val;
+ iv_val = iv ? tmp : 0;
+ } else {
+ dst_val = des_encdec(src_val ^ iv_val, d->round_keys[0], 0);
+ if (d->triple_des) {
+ dst_val = des_encdec(dst_val, d->round_keys[1], 1);
+ dst_val = des_encdec(dst_val, d->round_keys[2], 0);
+ }
+ iv_val = iv ? dst_val : 0;
+ }
+ AV_WB64(dst, dst_val);
+ src += 8;
+ if (!mac)
+ dst += 8;
+ }
+ if (iv)
+ AV_WB64(iv, iv_val);
+}
+
+void av_des_crypt(AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt) {
+ av_des_crypt_mac(d, dst, src, count, iv, decrypt, 0);
+}
+
+void av_des_mac(AVDES *d, uint8_t *dst, const uint8_t *src, int count) {
+ av_des_crypt_mac(d, dst, src, count, (uint8_t[8]){0}, 0, 1);
+}
+
#ifdef TEST
-#undef printf
-#undef rand
-#undef srand
#include <stdlib.h>
#include <stdio.h>
-#include <sys/time.h>
+#include "libavutil/time.h"
static uint64_t rand64(void) {
uint64_t r = rand();
r = (r << 32) | rand();
return r;
}
+static const uint8_t test_key[] = {0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0};
+static const DECLARE_ALIGNED(8, uint8_t, plain)[] = {0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10};
+static const DECLARE_ALIGNED(8, uint8_t, crypt)[] = {0x4a, 0xb6, 0x5b, 0x3d, 0x4b, 0x06, 0x15, 0x18};
+static DECLARE_ALIGNED(8, uint8_t, tmp)[8];
+static DECLARE_ALIGNED(8, uint8_t, large_buffer)[10002][8];
+static const uint8_t cbc_key[] = {
+ 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
+ 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01,
+ 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23
+};
+
+static int run_test(int cbc, int decrypt) {
+ AVDES d;
+ int delay = cbc && !decrypt ? 2 : 1;
+ uint64_t res;
+ AV_WB64(large_buffer[0], 0x4e6f772069732074ULL);
+ AV_WB64(large_buffer[1], 0x1234567890abcdefULL);
+ AV_WB64(tmp, 0x1234567890abcdefULL);
+ av_des_init(&d, cbc_key, 192, decrypt);
+ av_des_crypt(&d, large_buffer[delay], large_buffer[0], 10000, cbc ? tmp : NULL, decrypt);
+ res = AV_RB64(large_buffer[9999 + delay]);
+ if (cbc) {
+ if (decrypt)
+ return res == 0xc5cecf63ecec514cULL;
+ else
+ return res == 0xcb191f85d1ed8439ULL;
+ } else {
+ if (decrypt)
+ return res == 0x8325397644091a0aULL;
+ else
+ return res == 0xdd17e8b8b437d232ULL;
+ }
+}
+
int main(void) {
+ AVDES d;
int i;
#ifdef GENTABLES
int j;
#endif
- struct timeval tv;
- uint64_t key;
+ uint64_t key[3];
uint64_t data;
uint64_t ct;
- gettimeofday(&tv, NULL);
- srand(tv.tv_sec * 1000 * 1000 + tv.tv_usec);
- key = 0x123456789abcdef0ULL;
- data = 0xfedcba9876543210ULL;
- if (ff_des_encdec(data, key, 0) != 0x4ab65b3d4b061518ULL) {
+ uint64_t roundkeys[16];
+ srand(av_gettime());
+ key[0] = AV_RB64(test_key);
+ data = AV_RB64(plain);
+ gen_roundkeys(roundkeys, key[0]);
+ if (des_encdec(data, roundkeys, 0) != AV_RB64(crypt)) {
printf("Test 1 failed\n");
return 1;
}
- for (i = 0; i < 1000000; i++) {
- key = rand64();
+ av_des_init(&d, test_key, 64, 0);
+ av_des_crypt(&d, tmp, plain, 1, NULL, 0);
+ if (memcmp(tmp, crypt, sizeof(crypt))) {
+ printf("Public API decryption failed\n");
+ return 1;
+ }
+ if (!run_test(0, 0) || !run_test(0, 1) || !run_test(1, 0) || !run_test(1, 1)) {
+ printf("Partial Monte-Carlo test failed\n");
+ return 1;
+ }
+ for (i = 0; i < 1000; i++) {
+ key[0] = rand64(); key[1] = rand64(); key[2] = rand64();
data = rand64();
- ct = ff_des_encdec(data, key, 0);
- if (ff_des_encdec(ct, key, 1) != data) {
+ av_des_init(&d, key, 192, 0);
+ av_des_crypt(&d, &ct, &data, 1, NULL, 0);
+ av_des_init(&d, key, 192, 1);
+ av_des_crypt(&d, &ct, &ct, 1, NULL, 1);
+ if (ct != data) {
printf("Test 2 failed\n");
return 1;
}
projects / ffmpeg / blobdiff