使用CryptoAPI计算HASH和HMAC

记录一下hash和hmac的算法.

static void Hash(ALG_ID algId, BYTE* pData, DWORD dataLength, BYTE* pCode,DWORD* pdwLength){HCRYPTPROV hProv = NULL;BOOL blRet = FALSE;blRet=CryptAcquireContext(&hProv,NULL, NULL,PROV_RSA_FULL, 0);HCRYPTHASH hHash = NULL;blRet=CryptCreateHash(hProv,algId,0, 0,& hHash);blRet = CryptHashData(hHash, pData, dataLength, 0);DWORD dwLen = 20;blRet = CryptGetHashParam(hHash, HP_HASHVAL,NULL, &dwLen, 0);blRet=CryptGetHashParam(hHash, HP_HASHVAL, pCode, &dwLen, 0);CryptDestroyKey(hHash);CryptReleaseContext(hProv,0);*pdwLength = dwLen;}static void MyHMAC(ALG_ID algId, BYTE* _pKey, DWORD _dwKeyLength, BYTE* pData,DWORD dwDataLength,BYTE* pHMAC, DWORD* pdwHMACLength){const DWORD B = 64;//MD5和SHA这个值是64//首先第一步： 如果Key不足B长度，尾部填充0至B长度。//如果key长度大于B，则先将key进行HASH，然后结果如果小于B，尾部填充至B长度。BYTE fillKey[200]; DWORD dwFillKey = 0;if (_dwKeyLength > 64){Hash(algId, _pKey, _dwKeyLength, fillKey, &dwFillKey);}else{dwFillKey = _dwKeyLength;memcpy(fillKey, _pKey, _dwKeyLength);}for (int i = dwFillKey; i < B; i++)fillKey[i] = 0;///////////////////////////////////////////////第二步，填充ipad和opad。 都是B长度。//拷贝FillKey到ipad和opad，然后进行异或运算BYTE k_ipad[B], k_opad[B];memcpy(k_ipad, fillKey, B);memcpy(k_opad, fillKey, B);for (int i = 0; i < B; i++){k_ipad[i]^= 0x36;k_opad[i] ^= 0x5c;}//将ipad与data连接起来进行hashDWORD dwConLength1 = B + dwDataLength;BYTE* pCon1 = new BYTE[dwConLength1];memcpy(pCon1, k_ipad, B);memcpy(pCon1 + B, pData, dwDataLength);BYTE HashSha1[200]; DWORD dwHashLen1 = 0;Hash(algId, pCon1, dwConLength1, HashSha1, &dwHashLen1);///////////////////////////////////hash的长度，应该是固定的int HashLength = dwHashLen1;//将opad与上次hash的结果连接起来，进行hash ，结果就是hmacDWORD dwConLength2 = B + HashLength;BYTE* pCon2 = new BYTE[dwConLength2];memcpy(pCon2, k_opad, B);memcpy(pCon2 + B, HashSha1, HashLength);BYTE HashSha2[200]; DWORD dwHashLen2 = 0;Hash(algId, pCon2, dwConLength2, HashSha2, &dwHashLen2);memcpy(pHMAC, HashSha2, HashLength);*pdwHMACLength = dwHashLen2;}