如何使用 bouncy castle 在 Java 中创建 SHA512 摘要字符串？

发布于 2024-08-20 08:52:40 字数 1639 浏览 5 评论 0原文

该单元测试失败：

    public void testDigest() throws NoSuchAlgorithmException {
    String hashExpected = "150a14ed5bea6cc731cf86c41566ac427a8db48ef1b9fd626664b3bfbb99071fa4c922f33dde38719b8c8354e2b7ab9d77e0e67fc12843920a712e73d558e197";
    MessageDigest md = new MessageDigest();
    String hashActual = new String(md.digest("hi"));
    Assert.assertEquals(hashExpected, hashActual);
}

下面是我的 MessageDigest 类的实现：


import java.io.IOException;
import java.io.InputStream;
import java.security.NoSuchAlgorithmException;
import java.security.Security;

导入 org.bouncycastle.crypto.Digest；
导入 org.bouncycastle.crypto.digests.SHA512Digest；
导入 org.bouncycastle.crypto.io.DigestInputStream;
导入 org.bouncycastle.jce.provider.BouncyCastleProvider;

公共类消息摘要{
    私人摘要消息摘要；

public MessageDigest() throws NoSuchAlgorithmException {
    Security.addProvider(new BouncyCastleProvider());
    messageDigest = new SHA512Digest();
}

public byte[] digest(String message) {
    byte[] retValue = new byte[messageDigest.getDigestSize()];
    messageDigest.update(message.getBytes(), 0, message.length());
    messageDigest.doFinal(retValue, 0);
    return retValue;
}


 }

测试失败，原因如下：


junit.framework.ComparisonFailure: expected:<150a14ed5bea6cc731cf86c41566ac427a8db48ef1b9fd626664b3bfbb99071fa4c922f33dde38719b8c8354e2b7ab9d77e0e67fc12843920a712e73d558e197> but was:<
í[êlÇ1Ï†Äf¬Bz�´Žñ¹ýbfd³¿»™¤É"ó=Þ8q›ŒƒTâ·«�wàæÁ(C’
q.sÕXá

当我将 byte[] 摘要转换为字符串时，我有一种感觉没有使用正确的编码方案。任何帮助将不胜感激。

原文

This unit test is failing:

    public void testDigest() throws NoSuchAlgorithmException {
    String hashExpected = "150a14ed5bea6cc731cf86c41566ac427a8db48ef1b9fd626664b3bfbb99071fa4c922f33dde38719b8c8354e2b7ab9d77e0e67fc12843920a712e73d558e197";
    MessageDigest md = new MessageDigest();
    String hashActual = new String(md.digest("hi"));
    Assert.assertEquals(hashExpected, hashActual);
}

Below is my implementation of my MessageDigest class:


import java.io.IOException;
import java.io.InputStream;
import java.security.NoSuchAlgorithmException;
import java.security.Security;

import org.bouncycastle.crypto.Digest; import org.bouncycastle.crypto.digests.SHA512Digest; import org.bouncycastle.crypto.io.DigestInputStream; import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class MessageDigest { private Digest messageDigest;

public MessageDigest() throws NoSuchAlgorithmException {
    Security.addProvider(new BouncyCastleProvider());
    messageDigest = new SHA512Digest();
}

public byte[] digest(String message) {
    byte[] retValue = new byte[messageDigest.getDigestSize()];
    messageDigest.update(message.getBytes(), 0, message.length());
    messageDigest.doFinal(retValue, 0);
    return retValue;
}

}

The test fails with the following reason:


junit.framework.ComparisonFailure: expected:<150a14ed5bea6cc731cf86c41566ac427a8db48ef1b9fd626664b3bfbb99071fa4c922f33dde38719b8c8354e2b7ab9d77e0e67fc12843920a712e73d558e197> but was:<
í[êlÇ1Ï†Äf¬Bz�´Žñ¹ýbfd³¿»™¤É"ó=Þ8q›ŒƒTâ·«�wàæÁ(C’
q.sÕXá

I have a feeling I'm not using the right encoding scheme when I convert my byte[] digest into a string. Any help would be appreciated.

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猫九 2024-08-27 08:52:40

您期望的值是十六进制编码的值。您正在基于原始字节创建一个字符串，这是行不通的。

您应该尽可能使用标准 Java Crypto API，而不是 BouncyCastle 特定的 API。

尝试以下操作（十六进制库来自 commons-codec）：

Security.addProvider(new BouncyCastleProvider());

String data = "hello world";

MessageDigest mda = MessageDigest.getInstance("SHA-512", "BC");
byte [] digesta = mda.digest(data.getBytes());

MessageDigest mdb = MessageDigest.getInstance("SHA-512", "BC");
byte [] digestb = mdb.digest(data.getBytes());

System.out.println(MessageDigest.isEqual(digesta, digestb));

System.out.println(Hex.encodeHex(digesta));

The value you're expecting is a Hex-encoded value. You're creating a String based on the raw bytes, which won't work.

You should use the standard Java Crypto API whenever possible instead of BouncyCastle specific APIs.

Try the following (the Hex library comes from commons-codec):

Security.addProvider(new BouncyCastleProvider());

String data = "hello world";

MessageDigest mda = MessageDigest.getInstance("SHA-512", "BC");
byte [] digesta = mda.digest(data.getBytes());

MessageDigest mdb = MessageDigest.getInstance("SHA-512", "BC");
byte [] digestb = mdb.digest(data.getBytes());

System.out.println(MessageDigest.isEqual(digesta, digestb));

System.out.println(Hex.encodeHex(digesta));

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