1.源码实现
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/bn.h>
int main()
{
BN_CTX *r[3];
BIGNUM *a;
BIGNUM *b;
BIGNUM *c;
BIGNUM *d;
BIGNUM *e;
BIGNUM *f;
BIGNUM *g;
char u[512+1] = "FE7155A4C441E38D653CC7BB82D9B9A3BFB872CF151B8A19AF4D8E6035BFE6275FFC722ACD29EA9B1FF28B8D134DFAD001738DF7A2F78909DEF606836EE6C6CB";
char s[512+1] = "FDBAE7C63C5ECA65D27E9C8759AED3B8F6B36F24773FB6A4A03B49026B2D82491732CFDC9F3C77B61B19A945AA2386A7ABD69F23FBBFE18EDB6B7780A3C4CB13";
char t[512+1] = "C5C671EBC128B4423C6323DF7E43A1DD35EFCFF0F17B09AD1D6B3FCFBBBB685E6C725BCBC3518B9E067B260C2FE5849F24C839C6AA799732D8B5F8EDC9F286CB";
char *x;
r[0] = BN_CTX_new();
a = BN_new();
b = BN_new();
c = BN_new();
d = BN_new();
BN_hex2bn(&a, s);
BN_hex2bn(&b, t);
BN_hex2bn(&c, u);
BN_mod_exp(d, a, c, b, r[0]); //d=(a^b)%c
x = BN_bn2hex(d);
puts(x);
BN_free(a);
BN_free(b);
BN_free(c);
BN_free(d);
BN_CTX_free(r[0]);
free(x);
return 0;
}
2.编译源码
$ gcc -I$HOME/local/include -o example example.c -L$HOME/local/lib -lssl
3.运行结果
$ ./example
3D17E54FCF88FF4CAAF8780F5FF6DEAB374C223F8EA0D7F4B00DE6F2A601F8D9E2EE49A654B9F3CB23A2F454F811834D064866967DB903766881E2C6EE2F5ABF
