//引子，这些知识内容来源于网络加解密或其他的需要。
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//示例一：加解密一个文件。
//本文精简自msdn。
//下一个版本的，即CNG，需要vista或者server 2008.或者特殊的开发包。
#include <windows.h>
void MyEncryptFile(LPTSTR pszSourceFile, LPTSTR pszDestinationFile, LPTSTR pszPassword)
{
HCRYPTPROV hCryptProv = NULL;
CryptAcquireContext(&hCryptProv, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL,0);
HCRYPTHASH hHash = NULL;
CryptCreateHash(hCryptProv, CALG_MD5, 0, 0, &hHash);
CryptHashData(hHash, (BYTE *)pszPassword,lstrlen(pszPassword), 0);
HCRYPTKEY hKey = NULL;
CryptDeriveKey(hCryptProv, CALG_RC4, hHash, 0x00800000, &hKey);
HANDLE hSourceFile = CreateFile(pszSourceFile, FILE_READ_DATA,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
HANDLE hDestinationFile = CreateFile(pszDestinationFile, FILE_WRITE_DATA,FILE_SHARE_READ,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
PBYTE pbBuffer = (BYTE *)malloc(1000 - 1000 % 8 + 8);
bool fEOF = FALSE;
do
{
DWORD dwCount;
ReadFile(hSourceFile, pbBuffer, 1000 - 1000 % 8, &dwCount, NULL);
if(dwCount < 1000 - 1000 % 8) fEOF = TRUE;
CryptEncrypt(hKey, NULL, fEOF,0, pbBuffer,&dwCount, 1000 - 1000 % 8 + 8);
WriteFile(hDestinationFile, pbBuffer,dwCount,&dwCount,NULL);
} while(!fEOF);
CloseHandle(hDestinationFile);//立即写入文件。
}
void MyDecryptFile(LPTSTR pszSourceFile, LPTSTR pszDestinationFile, LPTSTR pszPassword)
{
HCRYPTPROV hCryptProv = NULL;
CryptAcquireContext(&hCryptProv, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL, 0);
HCRYPTHASH hHash = NULL;
CryptCreateHash(hCryptProv,CALG_MD5, 0, 0, &hHash);
CryptHashData(hHash, (BYTE *)pszPassword, lstrlen(pszPassword), 0);
HCRYPTKEY hKey = NULL;
CryptDeriveKey(hCryptProv, CALG_RC4,hHash, 0x00800000, &hKey);
HANDLE hSourceFile = CreateFile(pszSourceFile, FILE_READ_DATA,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
HANDLE hDestinationFile = CreateFile(pszDestinationFile,FILE_WRITE_DATA,FILE_SHARE_READ,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
PBYTE pbBuffer = (PBYTE)malloc(1000 - 1000 % 8);
bool fEOF = false;
do
{
DWORD dwCount;
ReadFile(hSourceFile, pbBuffer, 1000 - 1000 % 8, &dwCount, NULL);
if(dwCount < 1000 - 1000 % 8) fEOF = TRUE;
CryptDecrypt(hKey, 0, fEOF, 0, pbBuffer, &dwCount);
WriteFile(hDestinationFile, pbBuffer, dwCount,&dwCount,NULL);
}while(!fEOF);
CloseHandle(hDestinationFile);//立即写入文件。
}
int _tmain(int argc, _TCHAR* argv[])
{
MyEncryptFile((LPTSTR)L"c:\\test.txt", (LPTSTR)L"c:\\en.txt", (LPTSTR)L"correy");
MyDecryptFile((LPTSTR)L"c:\\en.txt", (LPTSTR)L"c:\\test_de.txt", (LPTSTR)L"correy");
return 0;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//示例二:加解密一段字符。//修改自msdn
#include <windows.h>
#pragma comment(lib, "crypt32.lib")
#define MY_ENCODING_TYPE (PKCS_7_ASN_ENCODING | X509_ASN_ENCODING)
void main(void)
{
BYTE* pbContent = (BYTE*) "This is a Encoding and Decoding a Hashed Message example from msdn\n"
"made by correy;QQ:112426112;email:leguanyuan@126.com;website:http://correy.webs.com";
DWORD cbContent = strlen((char *)pbContent)+1;
HCRYPTPROV hCryptProv;
CryptAcquireContext(&hCryptProv,NULL,NULL,PROV_RSA_FULL,0);
CRYPT_ALGORITHM_IDENTIFIER HashAlgorithm;
DWORD HashAlgSize = sizeof(HashAlgorithm);
memset(&HashAlgorithm, 0, HashAlgSize);
HashAlgorithm.pszObjId = szOID_RSA_MD5;
CMSG_HASHED_ENCODE_INFO HashedEncodeInfo;
memset(&HashedEncodeInfo, 0, sizeof(CMSG_HASHED_ENCODE_INFO));
HashedEncodeInfo.cbSize = sizeof(CMSG_HASHED_ENCODE_INFO);
HashedEncodeInfo.hCryptProv = hCryptProv;
HashedEncodeInfo.HashAlgorithm = HashAlgorithm;
HashedEncodeInfo.pvHashAuxInfo = NULL;
DWORD cbEncodedBlob = CryptMsgCalculateEncodedLength(MY_ENCODING_TYPE,0, CMSG_HASHED,&HashedEncodeInfo,NULL,cbContent);
BYTE * pbEncodedBlob = (BYTE *) malloc(cbEncodedBlob);
HCRYPTMSG hMsg = CryptMsgOpenToEncode(MY_ENCODING_TYPE,0,CMSG_HASHED,&HashedEncodeInfo,NULL,NULL);
CryptMsgUpdate(hMsg,pbContent,cbContent,TRUE);
HCRYPTMSG hDupMsg = CryptMsgDuplicate(hMsg);
CryptMsgGetParam(hDupMsg,CMSG_CONTENT_PARAM,0,pbEncodedBlob,&cbEncodedBlob);//加密 Encoding
CryptMsgClose(hMsg);
CryptMsgClose(hDupMsg);//加密结束，下面是解密。
hMsg = CryptMsgOpenToDecode(MY_ENCODING_TYPE,0,0,hCryptProv,NULL,NULL);
CryptMsgUpdate(hMsg,pbEncodedBlob,cbEncodedBlob,TRUE);
DWORD cbData = sizeof(DWORD);
DWORD dwMsgType;
CryptMsgGetParam(hMsg,CMSG_TYPE_PARAM,0,&dwMsgType,&cbData);//if(dwMsgType == CMSG_HASHED) printf("The message is a hashed message. Proceed. \n");
DWORD cbDecoded;
CryptMsgGetParam(hMsg,CMSG_CONTENT_PARAM,0,NULL,&cbDecoded);//获取应得的内存大小。
BYTE * pbDecoded = (BYTE *) malloc(cbDecoded);
CryptMsgGetParam(hMsg,CMSG_CONTENT_PARAM,0, pbDecoded,&cbDecoded);//解密 Decoding
CryptMsgControl(hMsg,0,CMSG_CTRL_VERIFY_HASH,NULL);
if(pbEncodedBlob) free(pbEncodedBlob);
if(pbDecoded) free(pbDecoded);
CryptMsgClose(hMsg);
if(hCryptProv) CryptReleaseContext(hCryptProv,0);
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//示例三：计算一个文件的MD5 hash，其实用这个dll里面的别的api也可以实现的。//修改自msdn
#include <windows.h>
DWORD main()
{
HANDLE hFile = CreateFile(L"c:\\a.txt",GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_FLAG_SEQUENTIAL_SCAN,NULL);
HCRYPTPROV hProv = 0;
CryptAcquireContext(&hProv,NULL,NULL,PROV_RSA_FULL,CRYPT_VERIFYCONTEXT);// Get handle to the crypto provider
HCRYPTHASH hHash = 0;
CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash);
BYTE rgbFile[1024] = {0};
DWORD cbRead = 0;
while (ReadFile(hFile, rgbFile, 1024, &cbRead, NULL))
{
if (0 == cbRead) break;
CryptHashData(hHash, rgbFile, cbRead, 0);
}
DWORD cbHash = 16;
BYTE rgbHash[16];
if (CryptGetHashParam(hHash, HP_HASHVAL, rgbHash, &cbHash, 0))
{ //下面是显示。
printf("MD5 hash of you select file is: ");
for (DWORD i = 0; i < cbHash; i++)
{
CHAR rgbDigits[] = "0123456789abcdef";
printf("%c%c", rgbDigits[rgbHash[i] >> 4],rgbDigits[rgbHash[i] & 0xf]);
}
//printf("\n");
}
CryptDestroyHash(hHash);
CryptReleaseContext(hProv, 0);
CloseHandle(hFile);
return 0;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//示例四：Example C++ Program: Creating an HMAC.made from msdn
#include <windows.h>
int main()
{
HCRYPTPROV hProv = NULL;
CryptAcquireContext(&hProv,NULL,NULL,PROV_RSA_FULL,CRYPT_VERIFYCONTEXT);
HCRYPTHASH hHash = NULL;
CryptCreateHash(hProv, CALG_SHA1, 0, 0, &hHash);
BYTE Data1[] = {0x70,0x61,0x73,0x73,0x77,0x6F,0x72,0x64};
CryptHashData(hHash,Data1,sizeof(Data1),0);
HCRYPTKEY hKey = NULL;
CryptDeriveKey(hProv, CALG_RC4, hHash, 0, &hKey);
HMAC_INFO HmacInfo;
ZeroMemory(&HmacInfo, sizeof(HmacInfo));
HmacInfo.HashAlgid = CALG_SHA1;
HCRYPTHASH hHmacHash = NULL;
CryptCreateHash(hProv,CALG_HMAC,hKey, 0, &hHmacHash);
CryptSetHashParam(hHmacHash,HP_HMAC_INFO,(BYTE*)&HmacInfo,0);
BYTE Data2[] = {0x6D,0x65,0x73,0x73,0x61,0x67,0x65};
CryptHashData(hHmacHash,Data2,sizeof(Data2),0);
DWORD dwDataLen = 0;
CryptGetHashParam(hHmacHash,HP_HASHVAL,NULL,&dwDataLen,0);
PBYTE pbHash = NULL;
pbHash = (BYTE*)malloc(dwDataLen);
CryptGetHashParam(hHmacHash,HP_HASHVAL,pbHash,&dwDataLen,0);
printf("The hash is: ");
for(DWORD i = 0 ; i < dwDataLen ; i++)
{
printf("%2.2x ",pbHash[i]);
}
printf("\n");
if(hHmacHash) CryptDestroyHash(hHmacHash);
if(hKey) CryptDestroyKey(hKey);
if(hHash) CryptDestroyHash(hHash);
if(hProv) CryptReleaseContext(hProv, 0);
if(pbHash) free(pbHash);
return 0;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//暂时到此为止，以后可以添加和修改。
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