使用OpenSSL进行大数运算-优快云博客

本文介绍了一个使用OpenSSL库进行大数运算的C语言示例程序，包括加法、减法、乘法和除法操作，并展示了如何编译和运行该程序。

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1.源码实现

#include

int main()

{

BN_CTX *r[3];

BIGNUM *a;

BIGNUM *b;

BIGNUM *c;

BIGNUM *d;

BIGNUM *e;

BIGNUM *f;

BIGNUM *g;

char s[512+1] = "FDBAE7C63C5ECA65D27E9C8759AED3B8F6B36F24773FB6A4A03B49026B2D82491732CFDC9F3C77B61B19A945AA2386A7ABD69F23FBBFE18EDB6B7780A3C4CB13";

char t[512+1] = "C5C671EBC128B4423C6323DF7E43A1DD35EFCFF0F17B09AD1D6B3FCFBBBB685E6C725BCBC3518B9E067B260C2FE5849F24C839C6AA799732D8B5F8EDC9F286CB";

char *x;

char *y;

char *z;

char *w;

char *p;

r[0] = BN_CTX_new();

r[1] = BN_CTX_new();

r[2] = BN_CTX_new();

//BN_CTX_init(r[0]);

//BN_CTX_init(r[1]);

//BN_CTX_init(r[2]);

a = BN_new();

b = BN_new();

c = BN_new();

d = BN_new();

e = BN_new();

f = BN_new();

g = BN_new();

BN_hex2bn(&a, s);

BN_hex2bn(&b, t);

BN_add(c, a, b); //加法

BN_sub(d, a, b); //减法

BN_mul(e, a, b, r[0]); //乘法

BN_div(f, g, a, b, r[1]); //除法

x = BN_bn2hex(c);

y = BN_bn2hex(d);

z = BN_bn2hex(e);

w = BN_bn2hex(f); //商

p = BN_bn2hex(g); //余数

puts(x);

puts(y);

puts(z);

puts(w);

puts(p);

BN_free(a);

BN_free(b);

BN_free(c);

BN_free(d);

BN_free(e);

BN_free(f);

BN_free(g);

BN_CTX_free(r[0]);

BN_CTX_free(r[1]);

BN_CTX_free(r[2]);

free(x);

free(y);

free(z);

free(w);

free(p);

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

01C38159B1FD877EA80EE1C066D7F275962CA33F1568BAC051BDA688D226E8EAA783A52BA8628E03542194CF51DA090B46D09ED8EAA63978C1B421706E6DB751DE

37F475DA7B361623961B78A7DB6B31DBC0C39F3385C4ACF782D00932AF7219EAAAC07410DBEAEC18149E83397A3E0208870E655D51464A5C02B57E92D9D24448

C40583D3FA1B2749E39513E018D3097A156E201C5E8AFE6AC17EE858E135A53BFE9B56D53A91D0C4CB777FD6F86A820B58A42BCE427F04B5083BA9E4BF48B3B0487382623B732B0F24FE463F9F602F017F5B8B10A0DADC5588833283569168792C0316AD59F696DB5D5520FB92BB957436C14AB66522647D154ED4CBC24EFA11

37F475DA7B361623961B78A7DB6B31DBC0C39F3385C4ACF782D00932AF7219EAAAC07410DBEAEC18149E83397A3E0208870E655D51464A5C02B57E92D9D24448