OPenssl大數庫呼叫
任務：
在openEuler(推薦)或Ubuntu或Windows(不推薦)中完成下面任務
1. 基於OpenSSL的大數庫計算2的N次方，N為你學號的後四位（5‘）
2. 基於OpenSSL的大數庫計算你以及前面5位同學和後面5位同學的8位學號的乘積，N為你學號的後四位（5‘）
3. 用Python或bc命令驗證計算的正確性（5’）
4. **提交程式碼（或程式碼連結）和執行結果截圖**
python驗證
2^1231
程式碼：
pragma comment(lib,"libssl.lib")
pragma comment(lib,"libcrypto.lib")
include <stdio.h>
include <stdlib.h>
include <stdint.h>
include <string.h>
include <openssl/bn.h>
int main(int argc, char* argv[])
{
{
BN_CTX* pBNctx = BN_CTX_new();
BIGNUM* n = BN_new();
BN_set_word(n, 1220);
BIGNUM* two = BN_new();
BN_set_word(two, 2);
BIGNUM* r = BN_new();
BN_exp(r, two, n, pBNctx);
char* pR = BN_bn2dec(r);
printf("2^1231 =%s \n", pR);
}
return 0;
}
學號前五位，後五位相乘
程式碼如下：
pragma comment(lib,"libssl.lib")
pragma comment(lib,"libcrypto.lib")
include <stdio.h>
include <stdlib.h>
include <stdint.h>
include <string.h>
include <openssl/bn.h>
int main(int argc, char* argv[])
{
//
BN_CTX* pBNctx = BN_CTX_new();
BIGNUM* n = BN_new();
BN_set_word(n, 1231);
BIGNUM* two = BN_new();
BN_set_word(two, 2);
BIGNUM* r = BN_new();
BN_exp(r, two, n, pBNctx);
char* pR = BN_bn2dec(r);
//printf("2^1210 =%s \n", pR);
BIGNUM* rr = BN_new();
BIGNUM* n1 = BN_new();
BIGNUM* n2 = BN_new();
int i;
BN_set_word(n1, 20191226);
BN_set_word(n2, 20191227);
BN_mul(rr, n1, n2,pBNctx);
for (i = 20191228; i <= 20191236; i++)
{
BN_set_word(n1, i);
// char* pR = BN_bn2dec(n1);
// printf(" =%s \n", pR);
BN_mul(rr, rr, n1,pBNctx);
}
pR = BN_bn2dec(rr);
printf("20191226 * …… * 20191236 =%s \n", pR);
return 0;