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>

void testRSAGen(){

    RSA    *r;

    int    bits=512,ret;

    unsigned long 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;

    unsigned char *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

    unsigned long 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("end private 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(){

    unsigned char in[]="asdfwerqrewrasfaser";

    unsigned char out[32];

    size_t n;

    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");