/*
* Function expects that shared_key is a preallocated buffer
- * with length defined as expkeylen - mac_len defined by mac_nid
+ * with length defined as expkeylen + mac_len defined by mac_nid
* */
int gost_kimp15(const unsigned char *expkey, const size_t expkeylen,
int cipher_nid, const unsigned char *cipher_key,