下面是一段C++ RC2加密 要求要用java 重写 能互相加密解密
QSBEncryptRc2::QSBEncryptRc2()
{
EncryKey = "DingXin Communication Key 20080613";
}
//解密失败时返回失败描述
AnsiString QSBEncryptRc2::GetDecryptErrMsg()
{
int ErrorCode;
AnsiString ErrMsg;
ErrorCode = GetLastError();
switch( ErrorCode )
{
case ERROR_INVALID_HANDLE:
ErrMsg = "其中一个参数是非法句柄";
break;
case NTE_BAD_ALGID:
ErrMsg = "不支持的加密算法";
break;
case NTE_BAD_DATA:
ErrMsg = "解密的数据非法";
break;
case NTE_BAD_FLAGS:
ErrMsg = "标识参数不为0";
break;
case NTE_BAD_HASH:
ErrMsg = "哈希参数非法";
break;
case NTE_BAD_KEY:
ErrMsg = "密钥是非法句柄";
break;
case NTE_BAD_LEN:
ErrMsg = "解密数据内存太小";
break;
case NTE_BAD_UID:
ErrMsg = "找不到CSP上下文";
break;
case NTE_DOUBLE_ENCRYPT:
ErrMsg = "应用企图解密已经解密的数据";
break;
case NTE_FAIL:
ErrMsg = "程序由于未知原因结束";
break;
default:
ErrMsg = "未知错误";
}
return ErrMsg;
}
//加密失败时返回失败描述
AnsiString QSBEncryptRc2::GetEncrytErrMsg()
{
int ErrorCode;
AnsiString ErrMsg;
ErrorCode = GetLastError();
switch( ErrorCode )
{
case ERROR_INVALID_HANDLE:
ErrMsg = "其中一个参数是非法句柄";
break;
case ERROR_INVALID_PARAMETER:
ErrMsg = "非法参数";
break;
case NTE_BAD_ALGID:
ErrMsg = "不支持的加密算法";
break;
case NTE_BAD_DATA:
ErrMsg = "解密的数据非法";
break;
case NTE_BAD_FLAGS:
ErrMsg = "标识参数不为0";
break;
case NTE_BAD_HASH:
ErrMsg = "哈希参数非法";
break;
case NTE_BAD_KEY:
ErrMsg = "密钥是非法句柄";
break;
case NTE_BAD_LEN:
ErrMsg = "解密数据内存太小";
break;
case NTE_BAD_UID:
ErrMsg = "找不到CSP上下文";
break;
case NTE_DOUBLE_ENCRYPT:
ErrMsg = "应用企图加密已经加密的数据";
break;
case NTE_NO_MEMORY:
ErrMsg = "内存不足";
break;
case NTE_FAIL:
ErrMsg = "程序由于未知原因结束";
break;
default:
ErrMsg = "未知错误";
}
return ErrMsg;
}
//加密数据
void QSBEncryptRc2::EncryptData(QSBBlob &inData,QSBBlob &outData)
{
HCRYPTPROV hProv = 0;
HCRYPTHASH hHash = 0;
HCRYPTKEY hKey = 0;
DWORD dwCurrLen,dwLength;
BYTE pbBuffer[BUFFER_SIZE];
DWORD dwCount;
int eof;
const char *ptr;
DWORD nLen;
DWORD nEncryCount;
AnsiString ErrMsg;
try
{
//连接CSP
if(!CryptAcquireContext(&hProv, TEXT("DingXinKey"), 0, PROV_RSA_FULL, 0))
{
//如KEY CONTAINER不存在,则重新创建一个
if( GetLastError() == (DWORD)NTE_BAD_KEYSET )
{
if(!CryptAcquireContext(&hProv, TEXT("DingXinKey"), 0, PROV_RSA_FULL,
CRYPT_NEWKEYSET))
throw QSBException(003,"创建KEY CONTAINER失败");
}
else
throw QSBException(003,"连接CSP失败");
}
//序列化密码
if(!CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash))
throw QSBException(003,"创建序列对象失败");
dwLength = strlen(EncryKey.c_str());
if(!CryptHashData(hHash, (BYTE *)EncryKey.c_str(), dwLength, 0))
throw QSBException(003,"序列化密码失败");
if(!CryptDeriveKey(hProv, CALG_RC2, hHash, CRYPT_EXPORTABLE, &hKey))
throw QSBException(003,"创建密钥失败");
//加密文件
outData.ClearContent();
ptr = inData.GetBlobPtr();
nLen = inData.GetBlobLength();
dwCurrLen = 0;
do
{
if( nLen-dwCurrLen>BLOCK_SIZE )
{
memcpy(pbBuffer,ptr+dwCurrLen,BLOCK_SIZE );
eof = false;
nEncryCount=BLOCK_SIZE;
}
else
{
memcpy(pbBuffer,ptr+dwCurrLen,nLen-dwCurrLen );
eof = true;
nEncryCount=nLen-dwCurrLen;
}
dwCount = nEncryCount;
if(!CryptEncrypt(hKey, 0, eof, 0, pbBuffer, &dwCount,BUFFER_SIZE))
{
ErrMsg.sprintf("加密失败:%s",GetEncrytErrMsg().c_str() );
throw QSBException(003,ErrMsg.c_str() );
}
outData.AppendBlobContent(pbBuffer,dwCount);
dwCurrLen += nEncryCount;
}
while(dwCurrLen
}
__finally
{
if(hHash != 0)
CryptDestroyHash(hHash);
if(hKey != 0)
CryptDestroyKey(hKey);
if(hProv != 0)
CryptReleaseContext(hProv,0);
}
}
//解密数据
void QSBEncryptRc2::DecryptData(QSBBlob &inData,QSBBlob &outData)
{
HCRYPTPROV hProv = 0;
HCRYPTHASH hHash = 0;
HCRYPTKEY hKey = 0;
DWORD dwCurrLen,dwLength;
BYTE pbBuffer[BUFFER_SIZE];
DWORD dwCount;
int eof;
const char *ptr;
DWORD nLen;
DWORD nDecryCount;
AnsiString ErrMsg;
try
{
//连接CSP
if(!CryptAcquireContext(&hProv, TEXT("DingXinKey"), 0, PROV_RSA_FULL, 0))
{
//如KEY CONTAINER不存在,则重新创建一个
if( GetLastError() == (DWORD)NTE_BAD_KEYSET )
{
if(!CryptAcquireContext(&hProv, TEXT("DingXinKey"), 0, PROV_RSA_FULL,
CRYPT_NEWKEYSET))
throw QSBException(003,"创建KEY CONTAINER失败");
}
else
throw QSBException(003,"连接CSP失败");
}
//序列化密码
if(!CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash))
throw QSBException(003,"创建序列对象失败");
dwLength = strlen(EncryKey.c_str());
if(!CryptHashData(hHash, (BYTE *)EncryKey.c_str(), dwLength, 0))
throw QSBException(003,"序列化密码失败");
if(!CryptDeriveKey(hProv, CALG_RC2, hHash, CRYPT_EXPORTABLE, &hKey))
throw QSBException(003,"创建密钥失败");
//解密文件
outData.ClearContent();
ptr = inData.GetBlobPtr();
nLen = inData.GetBlobLength();
dwCurrLen = 0;
do
{
if( nLen-dwCurrLen>BLOCK_SIZE )
{
memcpy(pbBuffer,ptr+dwCurrLen,BLOCK_SIZE );
eof = false;
nDecryCount=BLOCK_SIZE;
}
else
{
memcpy(pbBuffer,ptr+dwCurrLen,nLen-dwCurrLen );
eof = true;
nDecryCount=nLen-dwCurrLen;
}
dwCount = nDecryCount;
if(!CryptDecrypt(hKey, 0, eof, 0, pbBuffer, &dwCount))
{
ErrMsg.sprintf("解密数据失败:%s",GetDecryptErrMsg().c_str());
throw QSBException(003,ErrMsg.c_str());
}
outData.AppendBlobContent(pbBuffer,dwCount);
dwCurrLen += nDecryCount;
}
while(dwCurrLen
}
__finally
{
if(hHash != 0)
CryptDestroyHash(hHash);
if(hKey != 0)
CryptDestroyKey(hKey);
if(hProv != 0)
CryptReleaseContext(hProv,0);
}
}
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