HMAC-SHA1:如何在Java中正确执行它? [英] HMAC-SHA1: How to do it properly in Java?

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问题描述

我使用HMAC-SHA1散列一些值,在Java中使用以下代码:

  public static String hmacSha1字符串值,字符串键){
尝试{
//从原始密钥字节获取hmac_sha1密钥
byte [] keyBytes = key.getBytes();
SecretKeySpec signingKey = new SecretKeySpec(keyBytes,HmacSHA1);

//获取hmac_sha1 Mac实例并使用签名密钥初始化
Mac mac = Mac.getInstance(HmacSHA1);
mac.init(signingKey);

//计算输入数据字节的hmac
byte [] rawHmac = mac.doFinal(value.getBytes());

//将原始字节转换为十六进制
byte [] hexBytes = new Hex()。encode(rawHmac);

//向字符串隐藏十六进制字节数组
返回新字符串(hexBytes,UTF-8);
} catch(Exception e){
throw new RuntimeException(e);


code
$ b Hex() code>属于 org.apache.commons.codec



在PHP中,有一个类似的函数 hash_hmac(算法,数据,键),用于比较我的Java实现返回的值。



尝试是:

$ p $ hash_hmac(sha1,helloworld,mykey)// PHP
code>

返回: 74ae5a4a3d9996d5918defc2c3d475471bbf59ac



我的Java函数也返回 74ae5a4a3d9996d5918defc2c3d475471bbf59ac

好的,它似乎工作。然后我尝试使用更复杂的键:

  hash_hmac(sha1,helloworld,PRIE7 $ oG2uS-Yf17kEnUEpi5hvW /#AFo)// PHP 

返回: e98bcc5c5be6f11dc582ae55f520d1ec4ae29f7a $ b

这次我的Java impl返回: c19fccf57c613f1868dd22d586f9571cf6412cd0



我的PHP代码返回的哈希不等于我的Java函数返回的值,我找不到原因。



任何在你的PHP方面,围绕关键点使用单引号,这样 $

/ code>字符不被视为变量引用。即,

  hash_hmac(sha1,helloworld,'PRIE7 $ oG2uS-Yf17kEnUEpi5hvW /#AFo')

否则,您真正获得的密钥是 PRIE7-Yf17kEnUEpi5hvW /#AFo (假设变量 $ oG2uS 未定义)。


I'm hashing some values using HMAC-SHA1, using the following code in Java:

public static String hmacSha1(String value, String key) {
    try {
        // Get an hmac_sha1 key from the raw key bytes
        byte[] keyBytes = key.getBytes();           
        SecretKeySpec signingKey = new SecretKeySpec(keyBytes, "HmacSHA1");

        // Get an hmac_sha1 Mac instance and initialize with the signing key
        Mac mac = Mac.getInstance("HmacSHA1");
        mac.init(signingKey);

        // Compute the hmac on input data bytes
        byte[] rawHmac = mac.doFinal(value.getBytes());

        // Convert raw bytes to Hex
        byte[] hexBytes = new Hex().encode(rawHmac);

        //  Covert array of Hex bytes to a String
        return new String(hexBytes, "UTF-8");
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

Hex() belongs to org.apache.commons.codec

In PHP there's a similar function hash_hmac(algorithm, data, key) that I use to compare the values returned by my Java implementation.

So the first try is:

hash_hmac("sha1", "helloworld", "mykey") // PHP

that returns: 74ae5a4a3d9996d5918defc2c3d475471bbf59ac

My Java function returns 74ae5a4a3d9996d5918defc2c3d475471bbf59ac as well.

Ok, it seems working. Then I try to use a more complex key:

hash_hmac("sha1", "helloworld", "PRIE7$oG2uS-Yf17kEnUEpi5hvW/#AFo") // PHP

that returns: e98bcc5c5be6f11dc582ae55f520d1ec4ae29f7a

While this time my Java impl returns: c19fccf57c613f1868dd22d586f9571cf6412cd0

The hash returned by my PHP code is not equal to the value returned by my Java function, and I can't find out why.

Any tips?

解决方案

On your PHP side, use single-quotes around the key so that the $ character is not treated as a variable reference. i.e.,

hash_hmac("sha1", "helloworld", 'PRIE7$oG2uS-Yf17kEnUEpi5hvW/#AFo')

Otherwise, the key you really get is PRIE7-Yf17kEnUEpi5hvW/#AFo (assuming the variable $oG2uS is not defined).

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