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我使用此函数生成字符串的哈希

std::string MD5(string input)
{
    BYTE BytesHash[33];//!
    DWORD dwHashLen;
    string final;   
    HCRYPTPROV CryptProv;
    HCRYPTHASH CryptHash;
    if (CryptAcquireContext(&CryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) {
        if (CryptCreateHash(CryptProv, CALG_MD5, 0, 0, &CryptHash))     {
            if (CryptHashData(CryptHash, (BYTE*)input.c_str(), input.length(), 0))          {
                if (CryptGetHashParam(CryptHash, HP_HASHVAL, BytesHash, &dwHashLen, 0))             {
                    final.clear();
                    string hexcharset = "0123456789ABCDEF";
                    for (int j = 0; j < 16; j++) {
                        final += hexcharset.substr(((BytesHash[j] >> 4) & 0xF), 1);
                        final += hexcharset.substr(((BytesHash[j]) & 0x0F), 1);
                    }
                }
            }
        }
    }   CryptDestroyHash(CryptHash);
    CryptReleaseContext(CryptProv, …