#define _CRYPTO_H
int select_crypto_if(int ifno);
+const char *if_name(int ifno);
unsigned long encrypt(void *key, int keylen, void *pt, void *ct, int tlen);
unsigned long decrypt(void *key, int keylen, void *ct, void *pt, int tlen);
unsigned long hash(void *pt, int tlen, void *tag, int *taglen);