openssl RSA基本加密解密

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>

int main(int argc, char *argv[])
{
  // 产生RSA密钥对
  RSA *rsaKey = RSA_generate_key(1024, 65537, NULL, NULL);

	int keySize = RSA_size(rsaKey);
	
	char fData[]="aaabbbccdskjkfd";
	char tData[128];
	
	int  flen = strlen(fData);
	//flen = 15
		
	int ret =  RSA_public_encrypt(flen, (unsigned char *)fData, (unsigned char *)tData, rsaKey,  RSA_PKCS1_PADDING);
	//ret = 128
		
	ret = RSA_private_decrypt(128, (unsigned char *)tData, (unsigned char *)fData, rsaKey, RSA_PKCS1_PADDING);
	//ret = 15
		
	RSA_free(rsaKey);
	return 0;   
}

VC6.0编译通过

RSA_generate_key产生密钥对
参数一：密钥长度是 1024bit (小于1024被认为是不安全的)
参数二：公开的加密指数，通常是一个奇数，一般为3, 17 or 65537
后两个参数，回调函数和回调函数的参数&#x