C#HMAC SHA-256-128计算结果与预期不符

时间:2014-09-18 11:21:59

标签: c# hmac sha256

我正在尝试从指定的密钥为我们的银行创建签名,但我的结果与我从银行获得的信息不一样。谁能看到我做错了什么?

链接到bank以供参考(瑞典语文本)

示例数据位于引文标记内..:)

Filedata:“00000000”

密钥:“1234567890ABCDEF1234567890ABCDEF”

预期结果:“FF365893D899291C3BF505FB3175E880”

我的结果:“05CD81829E26F44089FD91A9CFBC75DB”

我的代码:

        // Using ASCII teckentabell
        System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();

        // Using HMAC-SHA256
        byte[] keyByte = encoding.GetBytes("1234567890ABCDEF1234567890ABCDEF");
        HMACSHA256 hmacsha256 = new HMACSHA256(keyByte);

        byte[] messageBytes = encoding.GetBytes("00000000");
        byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);

        byte[] truncArray = new byte[16];
        Array.Copy(hashmessage, truncArray, truncArray.Length);

        // conversion of byte to string            
        string sigill = ByteArrayToString(truncArray);

        // show sigill
        MessageBox.Show("Sigill:\n" + sigill, "Sigill", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

1 个答案:

答案 0 :(得分:4)

Key是一个十六进制数字字符串,表示二进制密钥,而不是单个字符串。

要获得正确的输出,您需要将其转换为字节数组:

var key = "1234567890ABCDEF1234567890ABCDEF";
byte[] keyByte = new byte[key.Length / 2];

for (int i = 0; i < key.Length; i += 2)
{
   keyByte[i / 2] = Convert.ToByte(key.Substring(i, 2), 16);
}

HMACSHA256 hmacsha256 = new HMACSHA256(keyByte);

byte[] messageBytes = encoding.GetBytes("00000000");
byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);

byte[] truncArray = new byte[16];
Array.Copy(hashmessage, truncArray, truncArray.Length);