用crypto api 实现公钥加密，私钥解密
终于使用Microsoft Enhanced Cryptographic Provider v1.0 实现了公钥加密和解密，但SafeSign CSP Version 1.0不能，不知为什么，有高手能解答吗？
另外dwBufLen 怎样计算才好，我取100，出编号234错，便取了200。
以下程序在VS2003下调试成功
#include "stdafx.h"
#include <stdio.h>
#include <windows.h>
#include <wincrypt.h>
void HandleError(char *s);
#define SA_SIGN_PROV "SafeSign CSP Version 1.0"
int _tmain(int argc, _TCHAR* argv[])
{
HCRYPTPROV hCryptProv;
HCRYPTKEY hXchgKey; //交换密钥
BYTE pbData[1000];
DWORD cbData;
printf("A cryptographic provider will acquired. \n");
char ch;
//--------------------------------------------------------------------
//访问ＣＳＰ
if(CryptAcquireContext(
&hCryptProv,
NULL, //NULL表示使用默认密钥容器，默认密钥容器名为用户登陆名
MS_ENHANCED_PROV ,//SA_SIGN_PROV ,
//SA_SIGN_PROV ,
PROV_RSA_FULL,
0))
{
printf("A cryptographic provider has been acquired. \n");
}
else
{
printf("Error in get cryptographic provider h. \n");
}
//得到ＣＳＰ参数
cbData = 10000;
if(CryptGetProvParam(
hCryptProv,
PP_NAME,
pbData,
&cbData,
CRYPT_FIRST ))
{
printf("CryptGetProvParam succeeded.\n");
printf("Provider name: %s\n", pbData);
}
else
{
printf("Error reading CSP name. \n");
//exit(1);
}
//得到用户的密钥对
if(CryptGetUserKey(
hCryptProv,
AT_KEYEXCHANGE,
&hXchgKey))
{
printf("The user exchange key pair has been retrieved. \n");
BOOL bResult;
DWORD dwSecretLen;
char bSecret[100]="I LOVE YOU"; //改了
dwSecretLen=strlen((char *) bSecret)+1;
//使用公钥加密
if(!CryptEncrypt(
hXchgKey, // 之前获得的密鈅对象
0, // 不散列数据
TRUE, // 最后的还是缓冲的数据
0, // 必须置0
(BYTE*)bSecret, // 数据缓冲区
&dwSecretLen, // 数据尺寸
200) // 数据块尺寸
)
{
printf("Error during CryptEncrypt. \n");
HandleError("Error during CryptEncrypt. \n");
}
else
{
printf("The CRYPTENCRYPT SUCESS. \n");
printf("Encrypt text:%s\n",bSecret);
}
//---------------------------------------------------------
//使用私钥解密
if(!CryptDecrypt(hXchgKey,0,TRUE,0,(BYTE*)bSecret,&dwSecretLen))//改了
{
HandleError("Error during decrypt. \n");
}
else
{ printf("CryptDecrypt sucess");
printf("Decrypt text:%s\n",bSecret);
ch=getchar();
}
}
getchar();
return 0;
}
void HandleError(char *s)
{
fprintf(stderr,"An error occurred in running the program. \n");
fprintf(stderr,"%s\n",s);
fprintf(stderr, "Error number %d.\n", GetLastError());
fprintf(stderr, "Program terminating. \n");
getchar();
exit(1);
} // End of HandleError