* Initialize an AVXTEA context.
*
* @param ctx an AVXTEA context
- * @param key a key of 16 bytes used for encryption/decryption
+ * @param key a key of 16 bytes used for encryption/decryption,
+ * interpreted as big endian 32 bit numbers
*/
void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
/**
- * Encrypt or decrypt a buffer using a previously initialized context.
+ * Encrypt or decrypt a buffer using a previously initialized context,
+ * in big endian format.
*
* @param ctx an AVXTEA context
* @param dst destination array, can be equal to src