diff --git a/libavutil/aes.h b/libavutil/aes.h
index 7d777198cb..08f3193ddc 100644
--- a/libavutil/aes.h
+++ b/libavutil/aes.h
@@ -32,4 +32,14 @@ struct AVAES;
  */
 int av_aes_init(struct AVAES *a, uint8_t *key, int key_bits, int decrypt);
 
+/**
+ * encrypts / decrypts.
+ * @param count number of 16 byte blocks
+ * @param dst destination array, can be equal to src
+ * @param src source array, can be equal to dst
+ * @param iv initalization vector for CBC mode, if NULL then ECB will be used
+ * @param decrypt 0 for encryption, 1 for decryption
+ */
+void aes_crypt(AVAES *a, uint8_t *dst, uint8_t *src, int count, uint8_t *iv, int decrypt);
+
 #endif /* AES_H */