Java 消息摘要 [MD5] 未生成预期的哈希值

Question

我尝试使用以下代码生成 MD5 十六进制哈希:

String password = "password";

MessageDigest digest = MessageDigest.getInstance("MD5");

ByteArrayInputStream bais = new ByteArrayInputStream(password.getBytes());

int size = 16;
byte[] bytes = new byte[size];
while ((bais.read(bytes, 0, size)) != -1)
{
  digest.update(bytes);
}

byte[] hash = digest.digest();
StringBuilder sb = new StringBuilder(2 * hash.length);
for (byte b : hash)
{
  sb.append(String.format("%02x", b & 0xff));
}

System.out.println("MD5:/ " + sb.toString());

输出应该是5f4dcc3b5aa765d61d8327deb882cf99(用md5sum检查)，但我看不出错误在哪里。我做错了什么？

Answer 1

我不知道你的有什么问题，但这应该有效:

byte[] array = MessageDigest.getInstance("MD5").digest("password".getBytes("UTF-8"));              
StringBuffer sb = new StringBuffer();
for (int i = 0; i < array.length; ++i) {
    sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));            
}
System.out.println(sb.toString());