将 C# HMAC SHA256 转换为 PHP

Question

我有一个 C# 方法，我必须将其转换为 PHP。我尝试了几件事，但仍然得到不同的结果。不幸的是，我无法更改 C# 应用程序上的任何内容。它必须保持原样。也许你们中有人可以帮忙？

C#:

static public void Main ()
{
    string StringToSign = "test";
    string Key = "123456";

    //Calculate Signature
    string Signature = CalculateSignature(StringToSign, Key);

    Console.WriteLine ("StringToSign: " + StringToSign);
    Console.WriteLine ("Key: " + Key);
    Console.WriteLine ("Signature Caculated: " + Signature + "\r\n");
}

static private string CalculateSignature(String StringToSign, String Key)
{
    Encoding enc = Encoding.GetEncoding(65001);

    byte[] KeyHex = StringHexValuesToByteArray(Key);
    byte[] StringToSign_byte = enc.GetBytes(StringToSign);

    //Check Signature
    HMACSHA256 hmac = new HMACSHA256(KeyHex);
    byte[] hashValue = hmac.ComputeHash(StringToSign_byte);

    return BitConverter.ToString(hashValue).Replace("-", "");
}

static public byte[] StringHexValuesToByteArray(string str)
{
    if (str.Length % 2 != 0)
        return null;

    string s = string.Empty;
    byte[] ret = new byte[str.Length / 2];

    for (int run = 0; run < str.Length / 2; run++)
    {
        s = str.Substring(run * 2, 2);
        ret[run] = Convert.ToByte(s, 16);
    }
    return ret;
}

PHP:

public function send() {

    $stringToSign = 'test';
    $key = '123456';

    //Calculate Signature
    $signature = $this->calculateSignature($stringToSign, $key);

    print_r("StringToSign: " . $stringToSign . PHP_EOL);
    print_r("Key: " . $key . PHP_EOL);
    print_r("Signature Caculated: " . $signature . PHP_EOL);
}

private function calculateSignature($stringToSign, $key) {

    // check signature
    $hash = strtoupper(hash_hmac('sha256', $stringToSign, $key, false));
    return $hash;
}

为了更好地理解，这里是上面代码块的输出：

C#

StringToSign: test

Key: 123456

Signature Caculated: DA3617974490FB780F04F06287BF93B0F24A7F15970471146428B943FFDC7850

PHP

StringToSign: test

GroupKey: 123456

Signature Caculated: 9D2BB116E1DF997FFE8A5139FC1D187F976C19579A138414A112BC2E39020EBA

Answer 1

如果要修改PHP使其等同于C#

改变

$hash = strtoupper(hash_hmac('sha256', $stringToSign, $key, false));

至

$hash = strtoupper(hash_hmac('sha256', $stringToSign, hex2bin($key), false));

一定要检查代码是否适用于非 ASCII 字符，例如 àèéìòù。

ideone here.

如果要修改C#代码使其等价于PHP

你把一切都复杂化了：

static private string CalculateSignature(String stringToSign, String key)
{
    byte[] key_byte = Encoding.UTF8.GetBytes(key);
    byte[] stringToSign_byte = Encoding.UTF8.GetBytes(stringToSign);

    //Check Signature
    HMACSHA256 hmac = new HMACSHA256(key_byte);
    byte[] hashValue = hmac.ComputeHash(stringToSign_byte);

    return BitConverter.ToString(hashValue).Replace("-", "");
}

没有十六进制。而不是使用 Encoding.GetEncoding(65001) 通常更好地使用 Encoding.UTF8，因为它对每个人都更清楚。

请注意，编码可能存在问题。尝试计算 àèéìòù 之类的 hmac 以查看 PHP 使用的是哪种编码。

将 C# HMAC SHA256 转换为 PHP

Convert C# HMAC SHA256 to PHP

php

c#

sha256

hmac