extern void sha1_mid(sha1 *, const uschar *);
extern void sha1_start(sha1 *);
extern int sieve_interpret(uschar *, int, uschar *, uschar *, uschar *,
extern void sha1_mid(sha1 *, const uschar *);
extern void sha1_start(sha1 *);
extern int sieve_interpret(uschar *, int, uschar *, uschar *, uschar *,