Python hmac和C#hmac [英] Python hmac and C# hmac

问题描述

我们有一个python网络服务.它需要一个哈希作为参数.python中的哈希是通过这种方式生成的.

We have a python web service. It needs a hash as a parameter. The hash in python is generated this way.

    hashed_data = hmac.new("ant", "bat", hashlib.sha1)
    print hashed_data.hexdigest()

现在，这就是我从C#生成哈希的方法.

Now, this is how I generate the hash from C#.

    ASCIIEncoding encoder = new ASCIIEncoding();
    Byte[] code = encoder.GetBytes("ant");
    HMACSHA1 hmSha1 = new HMACSHA1(code);
    Byte[] hashMe = encoder.GetBytes("bat");
    Byte[] hmBytes = hmSha1.ComputeHash(hashMe);
    Console.WriteLine(Convert.ToBase64String(hmBytes));

但是，我得出的结果是不同的.

However, I'm coming out with different result.

我应该更改哈希的顺序吗?

Should I change the order of the hashing?

谢谢

乔恩

推荐答案

为了打印结果:

• 在Python中，您使用: .hexdigest()
• 在C#中，您使用: Convert.ToBase64String

那两个函数根本不做相同的事情.Python的十六进制摘要将字节数组简单地转换为十六进制字符串，而C#方法使用Base64编码来转换字节数组.因此，要获得相同的输出，只需定义一个函数:

Those 2 functions don't do the same thing at all. Python's hexdigest simply converts the byte array to a hex string whereas the C# method uses Base64 encoding to convert the byte array. So to get the same output simply define a function:

public static string ToHexString(byte[] array)
{
    StringBuilder hex = new StringBuilder(array.Length * 2);
    foreach (byte b in array)
    {
        hex.AppendFormat("{0:x2}", b);
    }
    return hex.ToString();
}

然后:

ASCIIEncoding encoder = new ASCIIEncoding();
Byte[] code = encoder.GetBytes("ant");
HMACSHA1 hmSha1 = new HMACSHA1(code);
Byte[] hashMe = encoder.GetBytes("bat");
Byte[] hmBytes = hmSha1.ComputeHash(hashMe);
Console.WriteLine(ToHexString(hmBytes));

现在，您将获得与Python中相同的输出:

Now you will get the same output as in Python:

739ebc1e3600d5be6e9fa875bd0a572d6aee9266

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