OPENSSL RSA 加密 解密问题

[转]OPENSSL RSA 加密 解密问题

1 C

加密：

/*
gcc -o rsa-encrypt rsa-encrypt.c -lcrypto
*/
#include <openssl/rsa.h>
#include <openssl/err.h>

#define MODULUS "C8FBCF21"
#define PUBLIC_EXPONENT RSA_F4
#define PRIVATE_EXPONENT "97B55D7D"

int main()
{
    int ret, flen;
     BIGNUM *bnn, *bne, *bnd;
    unsigned char *in = "abc";
    unsigned char *out;

     bnn = BN_new();
     bne = BN_new();
     bnd = BN_new();
     BN_hex2bn(&bnn, MODULUS);
     BN_set_word(bne, PUBLIC_EXPONENT);
     BN_hex2bn(&bnd, PRIVATE_EXPONENT);

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

     flen = RSA_size(r);// - 11;

     out = (char *)malloc(flen);
     bzero(out, flen);
    //memset(out, 0, flen);


    printf("Begin encrypt...\n");
     ret = RSA_public_encrypt(flen, in, out, r,   RSA_NO_PADDING);
    if (ret < 0)
    {
        printf("Encrypt failed!\n");
        return 1;
    }

    printf("Size:%d\n", ret);
    printf("ClearText:%s\n", in);
    printf("CipherText(Hex):\n");
    int i;
    for (i=0; i<ret; i++)
    {
        printf("0x%02x, ", *out);
         out++;
    }
    printf("\n");

    //free(out);

     RSA_free(r);
    return 0;
}

解密：

/*
gcc -o rsa-decrypt rsa-decrypt.c -lcrypto
*/
#include <openssl/rsa.h>

#define MODULUS "C8FBCF21"
#define PUBLIC_EXPONENT RSA_F4
#define PRIVATE_EXPONENT "97B55D7D"

int main()
{
    int ret, flen;
     BIGNUM *bnn, *bne, *bnd;
    unsigned char in[] = {0x51, 0xc2, 0x8d, 0xc6};
    unsigned char *out;

     bnn = BN_new();
     bne = BN_new();
     bnd = BN_new();
     BN_hex2bn(&bnn, MODULUS);
     BN_set_word(bne, PUBLIC_EXPONENT);
     BN_hex2bn(&bnd, PRIVATE_EXPONENT);

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

     flen = RSA_size(r);
     out = (unsigned char *)malloc(flen);
     bzero(out, flen);

    printf("Begin decrypt...\n");
     ret = RSA_private_decrypt(sizeof(in), in, out, r, RSA_NO_PADDING);
    if (ret < 0)
    {
        printf("Decrypt failed!\n");
        return 1;
    }

    printf("Size:%d\n", ret);
    printf("ClearText:%s\n", out);

    free(out);
     RSA_free(r);
    return 0;
}

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