在Android的SHA256散列的错误calculatin [英] wrong calculatin of sha256 hash in android

问题描述

我有一个问题产生正确的哈希由Android工作室给定的字符串。我也读了不少解决方案，而无需了解如何转换的正确方法。
我需要正确的哈希值，因为我想提出一个与它的HTTP请求。​​

下面是我的code在JAVA：

 公共字符串getHash（最后弦乐appSecret，最后弦乐sessionToken）抛出抛出：NoSuchAlgorithmException，UnsupportedEncodingException {        字符串输入= sessionToken + appSecret;
        消息摘要消化= MessageDigest.getInstance（SHA-256）;
        digest.reset（）;        字节[] = byteData digest.digest（input.getBytes（UTF-8））;
        StringBuffer的SB =新的StringBuffer（）;        的for（int i = 0; I＆LT; byteData.length;我++）{
            sb.append（的String.format（％02X，为0xFF＆安培; byteData [I]））;
        }
        返回sb.toString（）;    }
 

有关等的输入：

<$p$p><$c$c>1130_11825_253402300799_1_1bcb4a27d42524de11325ec627b63878770a8651c0a0d8ddfc8fc06b92aea281634ff11f7d874c03851932304601439e

我所需要的精确的输出：

  01a9d698f0587a25ad8ef56b0994ec0022364aff91d668a4b3a4b97c40167672
 

但我得到一个错误的输出：

  a60f61b5e9f832b153a91e8d2b1ffa28b9611b2d60c3669663cfe050ac8e28cc
 

我想我的问题是如何读/打印字符串，但我无法弄清楚如何纠正它。
我知道，一个在线散列运算返回正确的哈希值。
谢谢你。

解决方案

我修改 getHash 采取AA单字符串，我去掉了调用复位（）和你完成消化（）。我也preFER的 每个循环。就像，

 公共静态字符串getHash（最终弦乐味精）{
    StringBuilder的SB =新的StringBuilder（）;
    尝试{
        消息摘要消化= MessageDigest.getInstance（SHA-256）;
        digest.update（msg.getBytes（））;
        字节[] = byteData digest.digest（）;
        对于（字节x：byteData）{
            字符串str = Integer.toHexString（Byte.toUnsignedInt（X））;
            如果（str.length（）2）{
                sb.append（'0'）;
            }
            sb.append（STR）;
        }
    }赶上（例外五）{
        e.printStackTrace（）;
    }
    返回sb.toString（）;
}
 

和调用它像

 公共静态无效的主要（字串[] args）{
    串出= getHash(\"1130_11825_253402300799_1_1bcb4a27d42524de11325ec627b63878770a8651c0a0d8ddfc8fc06b92aea281634ff11f7d874c03851932304601439e\");
    预计字符串=01a9d698f0587a25ad8ef56b0994ec0022364aff91d668a4b3a4b97c40167672;
    的System.out.println（out.equals（预期））;
}
 

我得到

 真
 

I have a problem generating a correct hash for a given string by android studio. I have read a lot of solutions without understanding how to convert it the right way. I need the correct hash since i am making an HTTP request with it.

Here is my code in JAVA:

public String getHash(final String appSecret , final String sessionToken)throws NoSuchAlgorithmException ,UnsupportedEncodingException{

        String input = sessionToken + appSecret;
        MessageDigest digest = MessageDigest.getInstance("SHA-256");
        digest.reset();

        byte[] byteData = digest.digest(input.getBytes("UTF-8"));
        StringBuffer sb = new StringBuffer();

        for (int i = 0; i < byteData.length; i++){
            sb.append(String.format("%02x", 0xFF & byteData[i]));
        }
        return sb.toString();

    }

For an input like:

1130_11825_253402300799_1_1bcb4a27d42524de11325ec627b63878770a8651c0a0d8ddfc8fc06b92aea281634ff11f7d874c03851932304601439e

I need the exact output:

01a9d698f0587a25ad8ef56b0994ec0022364aff91d668a4b3a4b97c40167672

but i got a wrong output:

a60f61b5e9f832b153a91e8d2b1ffa28b9611b2d60c3669663cfe050ac8e28cc

I think my problem is how to read/print the string but i can't figure out how to correct it. I know that an online hash calculator return a correct hash. Thanks.

解决方案

I modified getHash to take a a single String, I removed the call to reset() and you to finish digest(). I also prefer the for each loop. Like,

public static String getHash(final String msg) {
    StringBuilder sb = new StringBuilder();
    try {
        MessageDigest digest = MessageDigest.getInstance("SHA-256");
        digest.update(msg.getBytes());
        byte[] byteData = digest.digest();
        for (byte x : byteData) {
            String str = Integer.toHexString(Byte.toUnsignedInt(x));
            if (str.length() < 2) {
                sb.append('0');
            }
            sb.append(str);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return sb.toString();
}

And call it like

public static void main(String[] args) {
    String out = getHash("1130_11825_253402300799_1_1bcb4a27d42524de11325ec627b63878770a8651c0a0d8ddfc8fc06b92aea281634ff11f7d874c03851932304601439e");
    String expected = "01a9d698f0587a25ad8ef56b0994ec0022364aff91d668a4b3a4b97c40167672";
    System.out.println(out.equals(expected));
}

I get

true

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