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我正在尝试用 cryptopp::SHA256 替换 MS SHA256Managed 函数。这是 C# 代码

internal byte[] GenerateKey(byte[] keySeed, Guid keyId)
{
        byte[] truncatedKeySeed = new byte[30];
        Array.Copy(keySeed, truncatedKeySeed, truncatedKeySeed.Length);
        Console.WriteLine("Key Seed");
        foreach (byte b in truncatedKeySeed)
        {
            Console.Write("0x" + Convert.ToString(b, 16) + ",");
        }
        Console.WriteLine();
        //
        //  Get the keyId as a byte array
        //
        byte[] keyIdAsBytes = keyId.ToByteArray();
        SHA256Managed sha_A = new SHA256Managed();
        sha_A.TransformBlock(truncatedKeySeed, 0, truncatedKeySeed.Length, truncatedKeySeed, 0);
        sha_A.TransformFinalBlock(keyIdAsBytes, 0, keyIdAsBytes.Length);

        byte[] sha_A_Output = sha_A.Hash;
        Console.WriteLine("sha_a:" + sha_A_Output.Length);
        foreach (byte b in sha_A_Output)
        {
            Console.Write("0x" + Convert.ToString(b, 16) + ",");
        }
        Console.WriteLine(); 
        .....
}

输出结果：

关键种子 0x5d,0x50,0x68,0xbe,0xc9,0xb3,0x84,0xff,0x60,0x44,0x86,0x71,0x59,0xf1,0x6d,0x6b,0x75,0x55,0x44,0xfc,0xd5,0x11,0x69,0x89, 0xb1,0xac,0xc4,0x27,0x8e,0x88

密钥 ID 0x39,0x68,0xe1,0xb6,0xbd,0xee,0xf6,0x4f,0xab,0x76,0x8d,0x48,0x2d,0x8d,0x2b,0x6a,

sha_a:32 0x7b,0xec,0x8f,0x1b,0x60,0x4e,0xb4,0xab,0x3b,0xb,0xbd,0xb8,0x71,0xd6,0xba,0x71,0xb1,0x26,0x41,0x7d,0x99,0x55,0xdc,0x8e ,0x64,0x76,0x15,0x23,0x1b,0xab,0x76,0x62,

Crypto++的替换函数如下：

  byte key_seed[] = { 0x5D, 0x50, 0x68, 0xBE, 0xC9, 0xB3, 0x84, 0xFF, 0x60, 0x44, 0x86, 0x71, 0x59, 0xF1, 0x6D, 0x6B, 0x75, 0x55, 0x44, 0xFC,0xD5, 0x11, 0x69, 0x89, 0xB1, 0xAC, 0xC4, 0x27, 0x8E, 0x88 };
  byte key_id[] = { 0x39,0x68,0xe1,0xb6,0xbd,0xee,0xf6,0x4f,0xab,0x76,0x8d,0x48,0x2d,0x8d,0x2b,0x6a };
  byte truncated_key_seed[sizeof(key_seed)];
  memset( truncated_key_seed,0,sizeof(truncated_key_seed));
  memcpy( key_seed, truncated_key_seed, sizeof(key_seed) );
  byte output[SHA256::DIGESTSIZE];
  memset(output,0,sizeof(output));

  SHA256 sha_a;
  sha_a.Update(truncated_key_seed,sizeof(key_seed));
  sha_a.Update(key_id,sizeof(key_id));
  sha_a.Final(output);
  printf("size:%lu\n",sizeof(output));
  PrintHex(output,sizeof(output));

但是输出的哈希值为 DB 36 C9 F6 F7 29 6D 6F 52 21 DA 9F 55 1D AE BC 3E 5A 15 DF E1 37 07 EE 8F BC 73 61 5F D6 E1 C3 与C#的sha_a结果不同。

从MSDN和Cryptopp 参考资料中，SHA256Managed::TransformBlock 和 SHA256Managed::TransformFinalBlock 对 Cryptopp::Update 和 Cryptopp::Final 做了同样的事情。

SHA256Managed 和 cryptopp::SHA256 有什么区别导致这个结果？

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1 回答 1

0

对我来说，这似乎是您代码中的错误。

  sha_a.Update(truncated_key_seed,sizeof(key_seed));

确保truncated_key_seed两个版本中的相同，尤其是原始版本中未包含的字节key_seed...

于 2012-10-14T17:09:37.847 回答