c++ 基于wincrypt的DES CBC模式加解密

des.h

 

#pragma once

#include <windows.h>

#include <atlstr.h>

#include <wincrypt.h>

typedef struct

{

BLOBHEADER header;

DWORD cbKeySize;

BYTE rgbKeyData[8];

}KeyBlob;

const BYTE IV[] = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

DWORD DESEncrypt(CString data, CString password, BYTE * buffer, DWORD bufferLength);

DWORD DESDecrypt(BYTE* buffer, DWORD bufferLength, CString password);

***************************************************************

des.cpp

#include "des.h"

DWORD DESEncrypt(CString data, CString password, BYTE* buffer, DWORD bufferLength)

{

CT2CA passwd(password, CP_UTF8);

CT2CA secret(data, CP_UTF8);

DWORD dataLength = strlen(secret);

if (buffer == NULL || bufferLength < dataLength + 8 - (dataLength % 8) || password.GetLength() < 8) return 0;

memcpy(buffer, secret, dataLength);

HCRYPTPROV hProv = NULL;

HCRYPTKEY hSessionKey = NULL;

BOOL bResult = TRUE;

KeyBlob blob;

blob.header.bType = PLAINTEXTKEYBLOB;

blob.header.bVersion = CUR_BLOB_VERSION;

blob.header.reserved = 0;

blob.header.aiKeyAlg = CALG_DES;

blob.cbKeySize = 8;

memcpy(blob.rgbKeyData, passwd, 8);

bResult &= CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, 0);

bResult &= CryptImportKey(hProv, (BYTE*)&blob, sizeof(blob), 0, 0, &hSessionKey);

bResult &= CryptSetKeyParam(hSessionKey, KP_IV, (BYTE*)IV, 0);

bResult &= CryptEncrypt(hSessionKey, NULL, TRUE, 0, (BYTE*)buffer, &dataLength, bufferLength);

bResult &= CryptDestroyKey(hSessionKey);

bResult &= CryptReleaseContext(hProv, 0);

return bResult ? dataLength : 0;

}

DWORD DESDecrypt(BYTE* buffer, DWORD bufferLength, CString password)

{

CT2CA passwd(password, CP_UTF8);

DWORD dataLength = bufferLength;

if (buffer == NULL || password.GetLength() < 8) return 0;

HCRYPTPROV hProv = NULL;

HCRYPTKEY hSessionKey = NULL;

BOOL bResult = TRUE;

KeyBlob blob;

blob.header.bType = PLAINTEXTKEYBLOB;

blob.header.bVersion = CUR_BLOB_VERSION;

blob.header.reserved = 0;

blob.header.aiKeyAlg = CALG_DES;

blob.cbKeySize = 8;

memcpy(blob.rgbKeyData, passwd, 8);

bResult &= CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, 0);

bResult &= CryptImportKey(hProv, (BYTE*)&blob, sizeof(blob), 0, 0, &hSessionKey);

bResult &= CryptSetKeyParam(hSessionKey, KP_IV, (BYTE*)IV, 0);

bResult &= CryptDecrypt(hSessionKey, NULL, TRUE, 0, buffer, &dataLength);

bResult &= CryptDestroyKey(hSessionKey);

bResult &= CryptReleaseContext(hProv, 0);

return bResult ? dataLength : 0;

}

void main()

{

BYTE buffer[8] = { 0 };

int dataLength = DESEncrypt("testt", "123456", buffer, sizeof(buffer));

BYTE data[8] = { 0 };

int bufferLength = sizeof(buffer);

int _dataLength = DESDecrypt(buffer, bufferLength, "123456");

char *dest = (char *)malloc((_dataLength + 1) * sizeof(char));

memcpy(dest, buffer, _dataLength);

dest[_dataLength] = '';//必须加结束符

printf("result:%s", dest);

getchar();

}