xtea: Add functions for little endian mode

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 23 insertions, 0 deletions

diff --git a/libavutil/xtea.h b/libavutil/xtea.h
index ad76955db4..78b1f378db 100644
--- a/libavutil/xtea.h
+++ b/libavutil/xtea.h
@@ -55,6 +55,15 @@ AVXTEA *av_xtea_alloc(void);
 void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
 
 /**
+ * Initialize an AVXTEA context.
+ *
+ * @param ctx an AVXTEA context
+ * @param key a key of 16 bytes used for encryption/decryption,
+ *            interpreted as little endian 32 bit numbers
+ */
+void av_xtea_le_init(struct AVXTEA *ctx, const uint8_t key[16]);
+
+/**
  * Encrypt or decrypt a buffer using a previously initialized context,
  * in big endian format.
  *
@@ -69,6 +78,20 @@ void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
                    int count, uint8_t *iv, int decrypt);
 
 /**
+ * Encrypt or decrypt a buffer using a previously initialized context,
+ * in little endian format.
+ *
+ * @param ctx an AVXTEA context
+ * @param dst destination array, can be equal to src
+ * @param src source array, can be equal to dst
+ * @param count number of 8 byte blocks
+ * @param iv initialization vector for CBC mode, if NULL then ECB will be used
+ * @param decrypt 0 for encryption, 1 for decryption
+ */
+void av_xtea_le_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
+                      int count, uint8_t *iv, int decrypt);
+
+/**
  * @}
  */