return 0;
}
-void av_des_crypt(AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt) {
+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;
}
AV_WB64(dst, dst_val);
src += 8;
- dst += 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
* @brief Initializes an AVDES context.
*
* @param key_bits must be 64 or 192
- * @param decrypt 0 for encryption, 1 for decryption
+ * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption
*/
int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt);
*/
void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
+/**
+ * @brief Calculates CBC-MAC using the DES algorithm.
+ *
+ * @param count number of 8 byte blocks
+ * @param dst destination array, can be equal to src, must be 8-byte aligned
+ * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
+ */
+void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count);
+
#endif /* AVUTIL_DES_H */