[转载]RSA加密解密 

  1 //网上找的程序，可以运行！
  2 
  3  
  4 
  5 //加密：
  6 
  7 #include <openssl/rsa.h>
  8 #include <openssl/err.h>
  9 #include <string>
 10 #include <iostream>
 11 using namespace std;
 12 
 13 #define MODULUS "C8FBCF21"
 14 #define PUBLIC_EXPONENT RSA_F4
 15 #define PRIVATE_EXPONENT "97B55D7D"
 16 
 17 int main()
 18 {
 19   int ret, flen;
 20      BIGNUM *bnn, *bne, *bnd;
 21   unsigned char *in = (unsigned char*)"abc";
 22      unsigned char *out;
 23 
 24      bnn = BN_new();
 25      bne = BN_new();
 26      bnd = BN_new();
 27      BN_hex2bn(&bnn, MODULUS);
 28      BN_set_word(bne, PUBLIC_EXPONENT);
 29      BN_hex2bn(&bnd, PRIVATE_EXPONENT);
 30 
 31      RSA *r = RSA_new();
 32      r->n = bnn;
 33      r->e = bne;
 34      r->d = bnd;
 35      //ret = RSA_print_fp(stdout, r, 5);
 36 
 37      flen = RSA_size(r);// - 11;
 38 
 39      out = ( unsigned char *)malloc(flen);
 40      //bzero(out, flen);
 41      memset(out, 0, flen);
 42 
 43 
 44     printf("Begin encrypt...\n");
 45     ret = RSA_public_encrypt(flen,in,out,r,RSA_NO_PADDING);
 46     if (ret < 0)
 47     {
 48         printf("Encrypt failed!\n");
 49         return 1;
 50     }
 51 
 52     printf("Size:%d\n", ret);
 53     printf("ClearText:%s\n", in);
 54     printf("CipherText(Hex):\n");
 55     int i;
 56     for (i=0; i<ret; i++)
 57     {
 58         printf("0xx, ", *out);
 59         out++;
 60     }
 61     printf("\n");
 62 
 63     //free(out);
 64 
 65      RSA_free(r);
 66  
 67   cin.get();
 68   return 0;
 69 }
 70 
 71  
 72 
 73 //解密：
 74 
 75 #include <openssl/rsa.h>
 76 #include <string>
 77 #include <iostream>
 78 
 79 
 80 using namespace std;
 81 
 82 
 83 #define MODULUS "C8FBCF21"
 84 #define PUBLIC_EXPONENT RSA_F4
 85 #define PRIVATE_EXPONENT "97B55D7D"
 86 
 87 int main()
 88 {
 89     int ret, flen;
 90     BIGNUM *bnn, *bne;
 91     unsigned char in[] = {0x98, 0x79, 0xb2, 0x76};
 92     unsigned char *out;
 93 
 94     bnn = BN_new();
 95     bne = BN_new();
 96     BN_hex2bn(&bnn, MODULUS);
 97     BN_set_word(bne, PUBLIC_EXPONENT);
 98 
 99     RSA *r = RSA_new();
100     r->n = bnn;
101     r->e = bne;
102     //RSA_print_fp(stdout, r, 5);
103 
104     flen = RSA_size(r);
105     out = (unsigned char *)malloc(flen);
106     //bzero(out, flen);
107  memset(out, 0, flen);
108 
109     printf("Begin decrypt...\n");
110     ret = RSA_public_decrypt(sizeof(in), in, out, r, RSA_NO_PADDING);
111     if (ret < 0)
112     {
113         printf("Decrypt failed!\n");
114         return 1;
115     }
116     printf("Size:%d\n", ret);
117     printf("ClearText:%s\n ", out);
118 
119     free(out);
120     RSA_free(r);
121  cin.get();
122     return 0;
123 }

 

posted @ 2016-04-12 14:29  YBHello  阅读(233)  评论(0)    收藏  举报