中财网孙本新到底是不是医生:OpenSSL RSA 加密、解密
来源：百度文库 编辑：中财网 时间：2024/05/04 16:52:31
#include
#include
//////////////////////////////////////////////////////////////////////////
// 产生RSA公钥和密钥,并保存在文件中
//////////////////////////////////////////////////////////////////////////
BOOL GenerateRSAKey()
{
RSA *rsa=NULL;
TRACE(_T("正在产生RSA密钥...\n"));
rsa = RSA_generate_key(MAX_LENGTH, RSA_F4, NULL, NULL);
if (NULL == rsa)
{
TRACE(_T("gen rsa error\n"));
return FALSE;
}
// 公钥
BIO *bp = BIO_new(BIO_s_file());
if (0 >= BIO_write_filename(bp, "public.pem"))
{
TRACE(_T("write error\n"));
return FALSE;
}
if (1 != PEM_write_bio_RSAPublicKey(bp, rsa))
{
TRACE(_T("write public key error\n"));
return FALSE;
}
TRACE(_T("保存公钥成功\n"));
BIO_free_all(bp);
char passwd[]="1234";
// 私钥
// bp = BIO_new_file("private.pem", "w");
bp = BIO_new(BIO_s_file());
if ( 0 >= BIO_write_filename(bp, "private.pem"))
{
TRACE(_T("write error\n"));
return FALSE;
}
if ( 1 != PEM_write_bio_RSAPrivateKey(bp, rsa, NULL/*EVP_des_ede3()*/, NULL/*(unsigned char*)passwd*/, 0/*5*/, NULL, NULL))
{
TRACE(_T("write private key error\n"));
return FALSE;
}
TRACE(_T("保存私钥成功\n"));
BIO_free_all(bp);
RSA_free(rsa);
return TRUE;
}
//////////////////////////////////////////////////////////////////////////
// 私钥完成加密
//////////////////////////////////////////////////////////////////////////
BOOL EncryptByPrivateKey(CString strFrom, int nFromLen, CString& strTo, int& nOutLen)
{
BOOL bRet = FALSE;
BIO *pBio = NULL;
pBio = BIO_new_file("private.pem", "r");
if (NULL == pBio)
{
return bRet;
}
RSA *pRsa = PEM_read_bio_RSAPrivateKey(pBio, NULL, NULL, NULL);
BIO_free_all(pBio);
if (NULL == pRsa)
{
return bRet;
}
char *pFrom = NULL;
pFrom = (char*)malloc(MAX_LENGTH);
ASSERT(NULL != pFrom);
memset(pFrom, 0, MAX_LENGTH);
WideCharToMultiByte(CP_ACP, 0, strFrom, -1, pFrom, MAX_LENGTH, NULL, NULL);
unsigned char * pTo = NULL;
pTo = (unsigned char *)malloc(sizeof(unsigned char)*MAX_LENGTH);
ASSERT(NULL != pTo);
memset(pTo, 0, MAX_LENGTH);
nOutLen = RSA_private_encrypt((RSA_size(pRsa)-11) > nFromLen ? nFromLen : RSA_size(pRsa)-11,
reinterpret_cast
pTo,
pRsa,
RSA_PKCS1_PADDING);
strFrom.ReleaseBuffer();
unsigned char *pEncodeStr = (unsigned char *)malloc(MAX_LENGTH/*(nOutLen-1)/3 * 4 + 4*/);
memset(pEncodeStr, 0, MAX_LENGTH);
int nEncodeLen = ::EncodeBase64(pTo, pEncodeStr, nOutLen);
if (-1 == nEncodeLen) // 编码失败
{
free(pFrom);
free(pEncodeStr);
return bRet;
}
strTo = pEncodeStr;
free(pFrom);
free(pTo);
free(pEncodeStr);
RSA_free(pRsa);
if (nOutLen >= 0)
{
bRet = TRUE;
}
return bRet;
}
//////////////////////////////////////////////////////////////////////////
// 公钥完成解密
//////////////////////////////////////////////////////////////////////////
BOOL DecryptByPublicKey(CString strFrom, int nFromLen, CString& strTo, int& nOutLen)
{
BOOL bRet = FALSE;
BIO *pBio = BIO_new_file("public.pem", "r");
if (NULL == pBio)
{
return bRet;
}
RSA *pRsa = PEM_read_bio_RSAPublicKey(pBio, NULL, NULL, NULL);
BIO_free_all(pBio);
if (NULL == pRsa)
{
return bRet;
}
CString strTemp;
char *pFrom = NULL;
pFrom = (char*)malloc(MAX_LENGTH);
ASSERT(NULL != pFrom);
memset(pFrom, 0, MAX_LENGTH);
WideCharToMultiByte(CP_ACP, 0, strFrom, -1, pFrom, MAX_LENGTH, NULL, NULL);
int nlen = strlen(pFrom)/sizeof(unsigned char);
int nDeleteLen = 0;
strTemp = pFrom;
while(pFrom[--nlen] == '=')
{
nDeleteLen++;
}
unsigned char* pDecode = NULL;
pDecode = (unsigned char*)malloc(MAX_LENGTH);
memset(pDecode, 0, MAX_LENGTH);
int nDecodeLen = ::DecodeBase64(reinterpret_cast
if (-1 == nDecodeLen) // 解码错误
{
free(pFrom);
free(pDecode);
return bRet;
}
unsigned char * pTo = NULL;
pTo = (unsigned char *)malloc(MAX_LENGTH);
ASSERT(NULL != pTo);
memset(pTo, 0, MAX_LENGTH);
nOutLen = RSA_public_decrypt(
(nDecodeLen-nDeleteLen),
pDecode,
pTo,
pRsa,
RSA_PKCS1_PADDING);
strFrom.ReleaseBuffer();
strTo = pTo;
free(pFrom);
free(pDecode);
free(pTo);
RSA_free(pRsa);
if(nOutLen >= 0)
{
bRet = TRUE;
}
return bRet;
}