* 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>
};
#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 0;
}
-void av_des_crypt(AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt) {
- uint64_t iv_val = iv ? be2ne_64(*(uint64_t *)iv) : 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 ? be2ne_64(*(const uint64_t *)src) : 0;
+ uint64_t src_val = src ? AV_RB64(src) : 0;
if (decrypt) {
uint64_t tmp = src_val;
if (d->triple_des) {
}
iv_val = iv ? dst_val : 0;
}
- *(uint64_t *)dst = be2ne_64(dst_val);
+ AV_WB64(dst, dst_val);
src += 8;
- dst += 8;
+ if (!mac)
+ dst += 8;
}
if (iv)
- *(uint64_t *)iv = be2ne_64(iv_val);
+ 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
printf("Partial Monte-Carlo test failed\n");
return 1;
}
- for (i = 0; i < 1000000; i++) {
+ for (i = 0; i < 1000; i++) {
key[0] = rand64(); key[1] = rand64(); key[2] = rand64();
data = rand64();
av_des_init(&d, key, 192, 0);