#ifndef _CRYPTO_H
#define _CRYPTO_H
-int encrypt(void *pt, int ptlen, void *key, int keylen, void *ct, int *ctlen);
-int decrypt(void *ct, int ctlen, void *key, int keylen, void *pt, int *ptlen);
-int hash(void *pt, int ptlen, void *tag, int *taglen);
-int hmac(void *pt, int ptlen, void *key, int keylen, void *tag, int *taglen);
+int select_crypto_if(const int ifno);
+const char *crypto_init(const int ifno);
+unsigned long encrypt(const void *key, const int keylen, const void *pt, void *ct, const int tlen);
+unsigned long decrypt(const void *key, const int keylen, const void *ct, void *pt, const int tlen);
+unsigned long hash(const void *pt, const int tlen, void *tag, int *taglen);
+unsigned long hmac(const void *key, const int keylen, const void *pt, const int tlen,
+ void *tag, int *taglen);
+const char *crypto_errstr(const unsigned long err);
+
+#define HASHSIZE 20
+#define CBLKSIZE 16
#endif