C++、C#、HMACSHA1、HMACSHA256

ついでに、CryptAPIでHMACSHA256を作成しました。
当たり前ですが、C#のHMACSHA256と同じ結果を出力します。
HMACSHA1も可。
返り値であるCStringAはバイナリのコンテナとして使用しているので、読める字に直すにはBase64Encodeが必要。

CStringA HMACSHA( const CStringA& key, const CStringA& data, DWORD algid )

{

	//ttp://codebrook.wordpress.com/2010/07/14/twitter-oauth-in-c-for-win32-part-2/
	HCRYPTPROV  hProv       = NULL;

	HCRYPTKEY   hKey        = NULL;

	HCRYPTHASH  hHmacHash   = NULL;

	PBYTE       pbHash      = NULL;

	DWORD       dwDataLen   = 0;

	HMAC_INFO   HmacInfo;
	ATLASSERT( algid == CALG_SHA_256 || algid == CALG_SHA1 );
	ZeroMemory(&HmacInfo, sizeof(HmacInfo));

	HmacInfo.HashAlgid = algid;
	BOOL bl = CryptAcquireContext( &hProv,NULL,MS_ENH_RSA_AES_PROV,PROV_RSA_AES,CRYPT_VERIFYCONTEXT);

	ATLASSERT( bl );
	

	struct KeyBLOBHead 

	{

		BLOBHEADER hdr;

		DWORD len;		

	};
	int KeyBLOBSize =  sizeof(KeyBLOBHead) + key.GetLength(); // KeyBLOBHeadの後ろにキーデータ
	byte* ph = new byte[KeyBLOBSize];

	
	//CRYPT_IPSEC_HMAC_KEY:

	//Note: Allows for the import of an RC2 key that is larger than 16 bytes. 

	//If this flag is not set, calls to the CryptImportKey function with RC2 keys 

	//that are greater than 16 bytes fail, and a call to GetLastError will return NTE_BAD_DATA.


	KeyBLOBHead* pbh = (KeyBLOBHead*)ph;

	pbh->hdr.bType = PLAINTEXTKEYBLOB;

	pbh->hdr.bVersion = CUR_BLOB_VERSION;

	pbh->hdr.reserved = 0;

	pbh->hdr.aiKeyAlg = CALG_RC2;

	pbh->len = key.GetLength();
	byte* keyblob = (byte*)pbh + sizeof(KeyBLOBHead);
	CopyMemory(keyblob, (LPCSTR)key, pbh->len );

		

	bl = CryptImportKey(hProv, ph,KeyBLOBSize, 0,CRYPT_IPSEC_HMAC_KEY, OUT &hKey);

	ATLASSERT( bl );
	delete [] ph;
	

	bl = CryptCreateHash(hProv,CALG_HMAC,hKey, 0, OUT &hHmacHash);

	ATLASSERT( bl );
	bl = CryptSetHashParam(hHmacHash, HP_HMAC_INFO,(BYTE*)&HmacInfo,0);

	ATLASSERT( bl );
	bl = CryptHashData(hHmacHash, (BYTE*)(LPCSTR)data, data.GetLength(),0);

	ATLASSERT( bl );

	


	bl = CryptGetHashParam(hHmacHash, HP_HASHVAL,NULL,&dwDataLen, 0); // calc length

	ATLASSERT( bl );
	pbHash = new BYTE[dwDataLen];

    

	bl = CryptGetHashParam(hHmacHash, HP_HASHVAL, pbHash,&dwDataLen, 0);

	ATLASSERT( bl );
	CStringA hmacsha( (LPCSTR)pbHash, dwDataLen );	
	delete [] pbHash;




	if(hHmacHash)

		CryptDestroyHash(hHmacHash);

	if(hKey)

		CryptDestroyKey(hKey);

	if(hProv)

		CryptReleaseContext(hProv, 0);
	return hmacsha;

}