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我在 Linux 内核中使用 Crypto API (MD5)。它正在“工作”，但我不确定它是否正常工作。作为测试，我以这个字符串为例：

Here is a completely different setup that should produce a different fingerprint. Let's see.

结果哈希是

534d78034b774b6266f2189576f8c6e3

似乎是合法的。所以我检查了一个在线网站http://www.sha1-online.com/来检查他们的结果

07a90df929448eb67b00a6e01a202519

显然错了。这是我的代码：

static int fingerprint(void)
{
  struct scatterlist sg;
  struct crypto_hash *tfm;
  struct hash_desc desc;
  unsigned char * output;
  unsigned char * buf;
  int i;

  output = kmalloc(sizeof(*output) * 16, GFP_KERNEL);
  memset(output, 0x00, 16);

  buf = "Here is a completely different setup that should produce a different fingerprint. Let's see.";

  tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);

  desc.tfm = tfm;
  desc.flags = 0;

  sg_init_one(&sg, buf, 92);
  crypto_hash_init(&desc);

  crypto_hash_update(&desc, &sg, 92);
  crypto_hash_final(&desc, output);

  for(i = 0; i < 16; i++)
  {
    printk("%02x", output[i]);
  }

  printk("\n"); 
  return 0;
}

这段代码正确吗？有什么问题（明显的或微妙的）吗？

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0 回答 0