Question

我正在尝试使用以下函数生成SHA256： -

 func generateHMAC(key: String, data: String) -> String {
    let keyData = key.dataFromHexadecimalString()! as NSData
    let dataIn = data.dataUsingEncoding(NSUTF16StringEncoding)
    var result: [CUnsignedChar]
    result = Array(count: Int(CC_SHA256_DIGEST_LENGTH), repeatedValue: 0)
    CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA256), keyData.bytes, keyData.length, dataIn!.bytes, dataIn!.length, &result)

    let hash = NSMutableString()
    for val in result {
        hash.appendFormat("%02hhx", val)
    }

    return hash as String
}

输入

AccountNumber: 100195
Amount: 10 
BillerID: 59 
ChannelID: 2 
Context: 11|test
CountryID: 1 
CustomerID: 34
EmailID: ankur.arya@me.com
ReturnURL: https://uat.myfatoora.com/ReceiptPOC.aspx 
SECURITYTOKEN: 6B4A47A6-40A0-4C9D-A925-5CECA2910881 
TxnRefNum: 991107844408242 
UserName: USP

，输出

4cd1acc736a9702c8cdb1a546d1c274a67cb285dbdbb972aab39ee51c2a2‌26c8

但是，这与使用以下算法的后端输出不匹配

private string CreateSHA256POC(bool useRequest)
    {
        // Hex Decode the Secure Secret for use in using the HMACSHA256 hasher
        // hex decoding eliminates this source of error as it is independent of the character encoding
        // hex decoding is precise in converting to a byte array and is the preferred form for representing binary values as hex strings. 
        secureHash = "";
        byte[] convertedHash = new byte[_secureSecret.Length / 2];
        for (int i = 0; i < _secureSecret.Length / 2; i++)
        {
            convertedHash[i] = (byte)Int32.Parse(_secureSecret.Substring(i * 2, 2), System.Globalization.NumberStyles.HexNumber);
        }

        // Build string from collection in preperation to be hashed
        StringBuilder sb = new StringBuilder();
        SortedList<String, String> list = (useRequest ? requestFields : responseFields);
        foreach (KeyValuePair<string, string> kvp in list)
        {
            // if (kvp.Key.StartsWith("vpc_") || kvp.Key.StartsWith("user_"))
            sb.Append(kvp.Key + "=" + kvp.Value + "&");
        }
        // remove trailing & from string
        if (sb.Length > 0)
            sb.Remove(sb.Length - 1, 1);

        // Create secureHash on string
        string hexHash = "";
        using (HMACSHA256 hasher = new HMACSHA256(convertedHash))
        {
            byte[] hashValue = hasher.ComputeHash(Encoding.UTF8.GetBytes(sb.ToString()));
            foreach (byte b in hashValue)
            {
                hexHash += b.ToString("X2");
                secureHash = hexHash;
            }
        }
        return hexHash;
    }

并且他们的输出是

41D8E81C128100A76185F24CE00BC6A4FEA30839E6DE3DFFBC3B5814E4FD0C4E

密钥是

71DD0F73AFFBB47825FF9864DDE95F3B

你能不能请我帮助我在Swift中更新我的方法以获得与后端相同的结果。

感谢。

在Swift中生成SHA256（iOS）

0 个答案: