加密高手入

[shkspr]

HCRYPTPROV hProv = NULL;
HCRYPTKEY hKey = NULL;
HCRYPTHASH hHash = NULL;

PBYTE pbBuffer = NULL;
DWORD dwBufferLen = 0;
DWORD dwCount = 0;

BOOL status = FALSE;

// Get handle to the default provider.
if( !CryptAcquireContext( &hProv, NULL, NULL, PROV_RSA_FULL, 0 ) )
goto done;

// Encrypt the file with a session key derived from a password.

// Create a hash object.
if( !CryptCreateHash( hProv, CALG_MD5, 0, 0, &hHash ) )
goto done;

// Hash in the password data.
if( !CryptHashData( hHash, (const unsigned char *) pszHashKey, strlen( pszHashKey ), 0 ) )
goto done;

// Derive a session key from the hash object.
if( !CryptDeriveKey( hProv, ENCRYPT_ALGORITHM, hHash, 0, &hKey ) )
goto done;

// Destroy the hash object.
CryptDestroyHash( hHash );
hHash = 0;

dwBufferLen = strlen( pszIn );
dwCount = dwBufferLen;

// Allocate memory.
if( ( pbBuffer = (PBYTE) malloc( dwBufferLen ) ) == NULL )
goto done;

// Copy challenge into Buffer
strncpy( (char *) pbBuffer, pszIn, dwBufferLen );

// Encrypt data
if( !CryptEncrypt( hKey, 0, FALSE, 0, pbBuffer, &dwCount, dwBufferLen ) )
goto done;


上面这一段很通用的程序里，加密的结果会不会和机器和操作系统有关？
我怎么改称和机器和操作系统无关的。

[bager]

加密的结果不会和系统相关（我曾在Windows2000 P&&S,Window2003 Standard Edit RTM上测试过，可能不够全面），相关性应该只体现在加密相关函数（ Encryption/Decryption Functions）对系统版本的配置要求上，如下：
Windows NT/2000 or later: Requires Windows NT 4.0 or later.
Windows 95/98/Me: Requires Windows 95 OSR2 or later (or Windows 95 with Internet Explorer 3.02 or later).

帮你UP

[findmyself]

up

[kingzai]

这只是一段普通的HASH加密算法，加密结果跟操作系统没什么关系，编译的时候把WinVer的版本定高一些就可以通过。

[shkspr]

我用这段程序加密了一段数据，在本机上解开以后是正确的
在另外一台机器（不同系统）上解开以后是错误的

下面是解码的程序，高手帮我分析一下

HCRYPTPROV hProv = NULL;
HCRYPTKEY hKey = NULL;
HCRYPTHASH hHash = NULL;
PBYTE pbBuffer = NULL;
int nCount = 0;
BOOL bRetValue = FALSE;
CString strLineOut;

// Get handle to the default provider.
if( !CryptAcquireContext( &hProv, NULL, NULL,
PROV_RSA_FULL, CRYPT_MACHINE_KEYSET ) )
{
// Create default key container.
if( !CryptAcquireContext( &hProv, NULL, NULL,
PROV_RSA_FULL, CRYPT_NEWKEYSET | CRYPT_MACHINE_KEYSET ) )
{
goto Done;
}
}

// Encrypt the file with a session key derived from a password.

// Create a hash object.
if( !CryptCreateHash( hProv, CALG_MD5, 0, 0, &hHash ) )
{
goto Done;
}

// Hash in the password data.
if( !CryptHashData( hHash, (const unsigned char *) pszHashKey,
strlen( pszHashKey ), 0 ) )
{
goto Done;
}

// Derive a session key from the hash object.
if( !CryptDeriveKey( hProv, ENCRYPT_ALGORITHM, hHash, 0, &hKey ) )
{
goto Done;
}

// Destroy the hash object.
CryptDestroyHash( hHash );
hHash = NULL;

nCount = nBufLen;

// Allocate memory.
if( ( pbBuffer = (PBYTE) malloc( nBufLen ) ) == NULL )
{
goto Done;
}

// Copy challenge into Buffer
memcpy( pbBuffer, pbIn, nBufLen );

// Encrypt data
if( !CryptDecrypt( hKey, 0, FALSE, 0, pbBuffer, (DWORD *) &nCount ) )
{
goto Done;
}

// Copy Response out of Buffer
strncpy( pszOut, (const char *) pbBuffer, nBufLen );
pszOut[nBufLen] = 0;

bRetValue = TRUE;