CryptProtectData 执行失败返回 87

最新推荐文章于 2023-09-18 22:50:55 发布

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#encryption #encoding #function #null #wince #windows

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本文详细介绍了在Windows CE环境下使用CryptProtectData进行数据加密和解密的过程。通过一个具体的示例代码展示了如何正确初始化参数并处理可能出现的错误情况。

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在wince中使用CryptProtectData参照下面的代码

#include <stdio.h>
#include <windows.h>
#include <Wincrypt.h>
#define MY_ENCODING_TYPE  (PKCS_7_ASN_ENCODING | X509_ASN_ENCODING)
void MyHandleError(char *s);

void main()
{

DATA_BLOB DataIn;
DATA_BLOB DataOut;
DATA_BLOB DataVerify;
BYTE *pbDataInput =(BYTE *)"Hello world of data protection.";
DWORD cbDataInput = strlen((char *)pbDataInput)+1;
DataIn.pbData = pbDataInput;    
DataIn.cbData = cbDataInput;
CRYPTPROTECT_PROMPTSTRUCT PromptStruct;
LPWSTR pDescrOut = NULL;

//-------------------------------------------------------------------
//  Begin processing.

printf("The data to be encrypted is: %s/n",pbDataInput);

//-------------------------------------------------------------------
//  Initialize PromptStruct.

ZeroMemory(&PromptStruct, sizeof(PromptStruct));
PromptStruct.cbSize = sizeof(PromptStruct);
PromptStruct.dwPromptFlags = CRYPTPROTECT_PROMPT_ON_PROTECT;
PromptStruct.szPrompt = L"This is a user prompt.";

//-------------------------------------------------------------------
//  Begin protect phase.

if(CryptProtectData(
     &DataIn,
     L"This is the description string.", // A description string. 
     NULL,                               // Optional entropy
	                                     // not used.
     NULL,                               // Reserved.
     &PromptStruct,                      // Pass a PromptStruct.
     0,
     &DataOut))
{
     printf("The encryption phase worked. /n");
}
else
{
    MyHandleError("Encryption error!");
}
//-------------------------------------------------------------------
//   Begin unprotect phase.

if (CryptUnprotectData(
        &DataOut,
        &pDescrOut,
        NULL,                 // Optional entropy
        NULL,                 // Reserved
        &PromptStruct,        // Optional PromptStruct
        0,
        &DataVerify))
{
     printf("The decrypted data is: %s/n", DataVerify.pbData);
     printf("The description of the data was: %S/n",pDescrOut);
}
else
{
    MyHandleError("Decryption error!");
}
//-------------------------------------------------------------------
// At this point, memcmp could be used to compare DataIn.pbData and 
// DataVerify.pbDate for equality. If the two functions worked
// correctly, the two byte strings are identical. 

//-------------------------------------------------------------------
//  Clean up.

LocalFree(pDescrOut);
LocalFree(DataOut.pbData);
LocalFree(DataVerify.pbData);
} // End of main

//-------------------------------------------------------------------
//  This example uses the function MyHandleError, a simple error
//  handling function, to print an error message to the  
//  standard error (stderr) file and exit the program. 
//  For most applications, replace this function with one 
//  that does more extensive error reporting.

void MyHandleError(char *s)
{
    fprintf(stderr,"An error occurred in running the program. /n");
    fprintf(stderr,"%s/n",s);
    fprintf(stderr, "Error number %x./n", GetLastError());
    fprintf(stderr, "Program terminating. /n");
    exit(1);
} // End of MyHandleError

在ce下居然返回失败，GetLastError() = 87

上网查了很多资料都是这么调用了，没有办法有看了msdn87的含义是参数错误

分析只有DataOut这个参数可能有问题，因为没有被初始化为零。

添加上ZeroMemory(&DataOut,sizeof(DataOut))后ok，无语.....注意这是在windows ce 5.0中调用出错在windows xp并没有出错