PHP中的MD5功能与Android/Java等效吗? [英] What will be the Android/Java equivalent of MD5 function in PHP?

问题描述

我正在如下计算Android/Java中的MD5:

I am calculating the MD5 in Android/Java as follows:

byte raw[] = md.digest();   
StringBuffer hexString = new StringBuffer();
for (int i=0; i<raw.length; i++)
    hexString.append(Integer.toHexString(0xFF & raw[i]));
v_password = hexString.toString();

但是与PHP的md5()函数不匹配.

However there's a mismatch with PHP's md5() function.

MD5 - PHP  - Raw Value - catch12 - 214423105677f2375487b4c6880c12ae
MD5 - JAVA - Raw Value - catch12 - 214423105677f2375487b4c688c12ae

这是怎么引起的，我该如何解决，以便Android/Java和PHP都生成完全相同的MD5哈希?

How is this caused and how can I solve it so that the both Android/Java and PHP generate exactly the same MD5 hash?

推荐答案

当字节小于0x10时，您需要在0前面添加十六进制值的前缀.这是一个完整的示例:

You need to prefix hex value with 0 when the byte is less than 0x10. Here's a full example:

public static String md5(String string) {
    byte[] hash;

    try {
        hash = MessageDigest.getInstance("MD5").digest(string.getBytes("UTF-8"));
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException("Huh, MD5 should be supported?", e);
    } catch (UnsupportedEncodingException e) {
        throw new RuntimeException("Huh, UTF-8 should be supported?", e);
    }

    StringBuilder hex = new StringBuilder(hash.length * 2);

    for (byte b : hash) {
        int i = (b & 0xFF);
        if (i < 0x10) hex.append('0');
        hex.append(Integer.toHexString(i));
    }

    return hex.toString();
}

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