Bignum copybn(Bignum b);
Bignum bignum_from_short(unsigned short n);
void freebn(Bignum b);
-void modpow(Bignum base, Bignum exp, Bignum mod, Bignum result);
-void modmul(Bignum a, Bignum b, Bignum mod, Bignum result);
+Bignum modpow(Bignum base, Bignum exp, Bignum mod);
+Bignum modmul(Bignum a, Bignum b, Bignum mod);
void decbn(Bignum n);
extern Bignum Zero, One;
int ssh1_read_bignum(unsigned char *data, Bignum *result);