用指定的n,e,d生成RSA的数据结构

代码包括

1。生成RSA的数据结构

2。用指定的n,e,d生成RSA的数据结构

3。用私钥加密

4。用公钥解密

5。SHA256报文摘要

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <openssl/sha.h>

#include <openssl/rsa.h?

#include <openssl/pem.h>

#include <openssl/ssl.h>

#include <openssl/evp.h>

#include <openssl/bio.h>

#include <openssl/err.h>

#include <openssl/aes.h>

#include <openssl/rand.h>

#include <openssl/rsa_locl.h>

//这里需注意 openssl-OpenSSL_1_1_0-stable 后的版本中 r->e=bne;用法不对

//需要crypto文件夹中找到rsa_locl.h 放到include文件下

void testRSAGen(){
   RSA    *r;
   int   bits=512,ret;
    unsignedlong e=RSA_3;
   BIGNUM   *bne;
   r=RSA_generate_key(bits,e,NULL,NULL);
   RSA_print_fp(stdout,r,11);
   printf("--------------------------------/n");
   RSA_free(r);
   bne=BN_new();
   ret=BN_set_word(bne,e);
   r=RSA_new();
   ret=RSA_generate_key_ex(r,bits,bne,NULL);
   if(ret!=1)
    {
   printf("RSA_generate_key_ex err!/n");
    return-1;
    }
   //RSA_print_fp(stdout,r,11);
   RSA_free(r);

}
void testRSA(){
    RSA*r;
    BIGNUM*bne,*bnn,*bnd;

    int bits =1024, ret, len, flen, padding, i;

    unsignedchar *key, *p;
    BIO*b;
   //要加密的明文
   unsigned  char *in = "abcef";
   unsigned  char*encData,*decData,*tmpData;//加密后的数据/解密后的数据/临时指针

   //使用的密匙数据
    unsignedlong e = 75011;
    const char*MODULUS="9EC7D9A2DC5B095F8E5F90295121F41262FAEFBE9AF57B772A71F1F9D9635F8769CB78DA2BCFE9B27FC1F3AD4A3D178F8C61981225EF5DEACBDC5665F12E691AA13DDD321A59CFCF376F002036612FF3C5E057A3007FF675AFA3EDE34DC23A1A2637294870EBE823F76B5CE21E25F3FA5137F5DE12437DE0118245B927B28221";
    const char*PRIVATE="8B26E30ECA6E8F3668F6FA78B0C55FB75A4A3FAD0667B152933A4991D7A815D1498F5E1EF44ACEF6CDF252E56F367DED5BA024DF6B267B7E36BD35552DFA0A4CC1E9D0A4BC8E7C76F98D4971441D6693745A0A76E175571BD160E4B1536A6EFF5A08EDA45236E96E7A4748CF4D031CA8B2F4CCE9F2E1286F432DE6495A535E43";

   //构建RSA数据结构
    bne =BN_new();
    bnd =BN_new();
    bnn =BN_new();
    ret =BN_set_word(bne, e);
   BN_hex2bn(&bnd, PRIVATE);
   BN_hex2bn(&bnn, MODULUS);

    r =RSA_new();
   r->e=bne;
   r->d=bnd;
   r->n=bnn;
   RSA_print_fp(stdout, r, 5);

   //准备输出的加密数据结构
    flen=  RSA_size(r);// - 11;
    encData=  (unsigned char *)malloc(flen);
   bzero(encData, flen);//memset(encData, 0, flen);

   printf("Begin RSA_private_encrypt .../n");
    ret=  RSA_private_encrypt(flen, in, encData,r,  RSA_NO_PADDING);
    if(ret< 0){
      printf("Encrypt failed!/n");
      return;
    }
   printf("Size:%d/n", ret);
   printf("ClearText:%s/n", in);
   printf("CipherText(Hex):/n");
   tmpData=encData;
   for  (i=0; i<ret; i++){
       printf("0xx,", *tmpData);
      tmpData++;
    }
    printf("endprivate encrypt /n");
   printf("------------------------/n");


   //准备输出的解密数据结构
    flen=  RSA_size(r);// - 11;
    decData=  (unsigned char *)malloc(flen);
   bzero(decData, flen);//memset(encData, 0, flen);

   printf("Begin RSA_public_decrypt .../n");
    ret=  RSA_public_decrypt(flen, encData, decData,r,  RSA_NO_PADDING);
    if(ret< 0){
         printf("RSA_public_decrypt failed!/n");
         return;
    }
   printf("Size:%d/n", ret);
   printf("ClearText:%s/n", decData);

   free(encData);
   free(decData);
   RSA_free(r);

}
void testSHA256(){
    unsignedchar in[]="asdfwerqrewrasfaser";
    unsignedchar out[32];

    size_tn;
    int i;

   n=strlen((const char*)in);

   SHA256(in,n,out);
   printf("/n/nSHA256 digest result:/n");

   printf("%d/n",sizeof(out));

   for(i=0;i<32;i++)
      printf("%d",out[i]);
   printf("/n");

}
int main(void) {
   puts("!!!Hello World!!!");
   testSHA256();
   testRSA();
    returnEXIT_SUCCESS;
}