无效的算法指定CryptoAPI

时间:2009-10-07 02:34:31

标签: c++ aes cryptoapi

我正在尝试使用128BIT AES Decryption解密一些东西。当我尝试调用CryptDecrypt时,我收到一条错误,指出“指定了无效的算法”。使用此处发布的库时遇到同样的问题:http://www.codeproject.com/KB/security/WinAES.aspx

什么可能导致此错误?

我在vista64bit上使用CryptoAPI和visual studio 2008.我检查了注册表,AES库就在那里......

修改

BYTE*& encryptedData /*  get data length */
HCRYPTPROV cryptoHandle = NULL;
HCRYPTKEY aesKeyHandle = NULL;

hr = InitWinCrypt(cryptoHandle);
if(FAILED(hr))
{
    return hr;
}

AesKeyOffering aesKey = { {PLAINTEXTKEYBLOB, CUR_BLOB_VERSION, 0, CALG_AES_128}, 16, { 0xFF, 0x00, 0xFF, 0x1C, 0x1D, 0x1E, 0x03, 0x04, 0x05, 0x0F, 0x20, 0x21, 0xAD, 0xAF, 0xA4, 0x04 }};

if(CryptImportKey(cryptoHandle, (CONST BYTE*)&aesKey, sizeof(AesKeyOffering), NULL, 0, &aesKeyHandle) == FALSE)
{
    // DO error

    return HRESULT_FROM_WIN32(GetLastError());
}

if(CryptSetKeyParam(aesKeyHandle, KP_IV, { 0xFF, 0x00, 0xFF, 0x1C, 0x1D, 0x1E, 0x03, 0x04, 0x05, 0x0F, 0x20, 0x21, 0xAD, 0xAF, 0xA4, 0x04 } , 0) == FALSE)
{
    return HRESULT_FROM_WIN32(GetLastError());
}

BYTE blah2 = CRYPT_MODE_CBC;
// set block mode
if(CryptSetKeyParam(aesKeyHandle, KP_MODE, &blah2, 0) == FALSE)
{
    // 

    return HRESULT_FROM_WIN32(GetLastError());
}

DWORD lol = dataLength / 16 + 1;
DWORD lol2 = lol * 16;
if(CryptDecrypt(aesKeyHandle, 0, TRUE, 0, encryptedData, &lol2) == FALSE)
{
    return HRESULT_FROM_WIN32(GetLastError());
}

InitWinCrypt函数

    if(!CryptAcquireContextW(&cryptoHandle, NULL, L"Microsoft Enhanced RSA and AES Cryptographic Provider", PROV_RSA_AES, CRYPT_VERIFYCONTEXT))
{
    if(!CryptAcquireContextW(&cryptoHandle, NULL, L"Microsoft Enhanced RSA and AES Cryptographic Provider", PROV_RSA_AES, 0))
    {
        return HRESULT_FROM_WIN32(GetLastError());
    }
    else
    {
        return S_OK;
    }
}
return S_OK;

AesOffering struct:

struct AesKeyOffering
{
    BLOBHEADER m_Header;
    DWORD m_KeyLength;
    BYTE Key[16];
};

EDIT2

重新启动计算机后,重新启动CBC块。我现在收到错误的数据错误。数据在C#中解密很好。但我需要使用wincrypt来做到这一点。

1 个答案:

答案 0 :(得分:1)

您是否通过cryptoHandle提及InitWithCrypt?如果没有,您的代码

if(!CryptAcquireContextW(&cryptoHandle, ...

只会修改InitWinCrypt的{​​{1}}副本。


编辑:鉴于它确实如此,请尝试删除设置cryptoHandle

CryptSetKeyParam来电