[Java知识库]MessageDigest 消息摘要算法 Java实现

MessageDigest 消息摘要算法

项目地址

消息摘要算法相关命令：

# 使用 openssl
# openssl 查看支持的消息摘要算法
openssl dgst -list
# 常用 openssl 命令，常看文件的消息摘要
openssl dgst -sha256 Lindon2012.txt
openssl dgst -sha512 Lindon2012.txt
openssl dgst -sha512-256 Lindon2012.txt
openssl dgst -sha3-256 Lindon2012.txt

# 使用linux库命令
sha256sum Lindon2012.txt
sha512sum Lindon2012.txt

Java基础代码：（实践时可以封装算法，异常等）

package com.ysx.utils.crypto.dgst;

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;
import java.util.Arrays;
import java.util.List;

/**
 * @author youngbear
 * @email youngbear@aliyun.com
 * @date 2021/7/27 23:19
 * @blog https://blog.csdn.net/next_second
 * @github https://github.com/YoungBear
 * @description 消息摘要工具类
 * 参考：https://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html#Examples
 */
public class DgstUtils {

    /**
     * 常用摘要算法
     * 算法名称是大小写不敏感的
     */
    private static final List<String> DGST_ALGORITHM = Arrays.asList(
            "SHA-256",
            "SHA-512",
            "SHA-512/256",
            "SHA3-256",
            "SHA3-512"

    );

    static {
        Security.addProvider(new BouncyCastleProvider());
    }

    /**
     * 计算数据的消息摘要
     *
     * @param data          数据
     * @param algorithmName 算法名称
     * @return 消息摘要值
     * @throws NoSuchAlgorithmException 异常
     * @throws NoSuchProviderException  异常
     */
    public static String digest(byte[] data, String algorithmName) throws NoSuchAlgorithmException, NoSuchProviderException {
        MessageDigest messageDigest = MessageDigest.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME);
        messageDigest.update(data);
        return Hex.toHexString(messageDigest.digest());
    }

    /**
     * 计算文件的摘要值
     *
     * @param file          文件
     * @param algorithmName 算法名
     * @return 摘要值
     * @throws IOException              异常
     * @throws NoSuchAlgorithmException 异常
     * @throws NoSuchProviderException  异常
     */
    public static String digest(File file, String algorithmName) throws IOException, NoSuchAlgorithmException, NoSuchProviderException {
        if (file != null && file.exists() && file.canRead()) {
            byte[] buffer = new byte[1024];
            try (FileInputStream inputStream = new FileInputStream(file)) {
                int readSize = inputStream.read(buffer);
                MessageDigest messageDigest = MessageDigest.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME);
                while (readSize != -1) {
                    messageDigest.update(buffer, 0, readSize);
                    readSize = inputStream.read(buffer);
                }
                return Hex.toHexString(messageDigest.digest());
            }
        }
        throw new RuntimeException("illegal file.");
    }
}

测试代码：

package com.ysx.utils.crypto.dgst;

import com.ysx.utils.crypto.rsa.RSAUtilsBCTest;
import org.junit.Assert;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;

/**
 * @author youngbear
 * @email youngbear@aliyun.com
 * @date 2021/7/27 23:20
 * @blog https://blog.csdn.net/next_second
 * @github https://github.com/YoungBear
 * @description
 */
public class DgstUtilsTest {

    private static final String BASE_PATH = RSAUtilsBCTest.class.getResource("/digest/").getPath();

    @Test
    public void dgstSAH256Test() throws NoSuchAlgorithmException, NoSuchProviderException {
        byte[] data = "Lindon2012".getBytes(StandardCharsets.UTF_8);
        String digest = DgstUtils.digest(data, "SHA-256");
        String excepted = "9e7076e2f8063e1f4b884014d3150a2d17f0ff92e681e41ee4aba1ca24a71a0f";
        Assert.assertEquals(excepted, digest);
    }

    @Test
    public void dgstSAH512Test() throws NoSuchAlgorithmException, NoSuchProviderException {
        byte[] data = "Lindon2012".getBytes(StandardCharsets.UTF_8);
        String digest = DgstUtils.digest(data, "SHA-512");
        String excepted = "5262b18dea4dfca9cc0d943f4e1872298868a8ca53f2eb9f014e75894d14b36c2e00842e049ca8d02c25a5736acbf1ed53534df18de5be51270967f34ba0a903";
        Assert.assertEquals(excepted, digest);
    }

    @Test
    public void dgstSAH512_256Test() throws NoSuchAlgorithmException, NoSuchProviderException {
        byte[] data = "Lindon2012".getBytes(StandardCharsets.UTF_8);
        String digest = DgstUtils.digest(data, "SHA-512/256");
        String excepted = "335685f9c5011dcfe1bf02f19983f486be87a87695999366343ade6db40657de";
        Assert.assertEquals(excepted, digest);
    }

    @Test
    public void dgstSAH3_256Test() throws NoSuchAlgorithmException, NoSuchProviderException {
        byte[] data = "Lindon2012".getBytes(StandardCharsets.UTF_8);
        String digest = DgstUtils.digest(data, "SHA3-256");
        String excepted = "425e9cdd015f46b19c9b38bc64c0dfd624c96cd8d02a444892f8e312d9d303c0";
        Assert.assertEquals(excepted, digest);
    }

    @Test
    public void dgstFileSAH256Test() throws NoSuchAlgorithmException, NoSuchProviderException, IOException {
        File file = new File(BASE_PATH + "Lindon2012.txt");
        // sha256sum Lindon2012.txt
        // openssl dgst -sha256 Lindon2012.txt
        String digest = DgstUtils.digest(file, "SHA-256");
        String excepted = "9ccad67beb3a52c661da1483ae898c679c32814849daeb95bf7f5f15f19c443a";
        Assert.assertEquals(excepted, digest);
    }

    @Test
    public void dgstFileSAH512Test() throws NoSuchAlgorithmException, NoSuchProviderException, IOException {
        File file = new File(BASE_PATH + "Lindon2012.txt");
        // sha512sum Lindon2012.txt
        // openssl dgst -sha512 Lindon2012.txt
        String digest = DgstUtils.digest(file, "SHA-512");
        String excepted = "a29f01307e077502ae822522801143ac63209222bcf4a1f593fcdb76beed6cd73873e25904b7969f4a22ecb74f0a18fdef12c6d8ff1859ca9d2466a1a3f63f01";
        Assert.assertEquals(excepted, digest);
    }

    @Test
    public void dgstFileSAH512_256Test() throws NoSuchAlgorithmException, NoSuchProviderException, IOException {
        File file = new File(BASE_PATH + "Lindon2012.txt");
        // openssl dgst -sha512-256 Lindon2012.txt
        String digest = DgstUtils.digest(file, "SHA-512/256");
        String excepted = "8e9c612a1b2183ccaaf7f574f28270a18e44f03356b2dfbc09c4a257767bd970";
        Assert.assertEquals(excepted, digest);
    }

    @Test
    public void dgstFileSAH3_256Test() throws NoSuchAlgorithmException, NoSuchProviderException, IOException {
        File file = new File(BASE_PATH + "Lindon2012.txt");
        // openssl dgst -sha3-256 Lindon2012.txt
        String digest = DgstUtils.digest(file, "SHA3-256");
        String excepted = "35133fe1494d629118b64db91dc8a1b86648003908aef3a94732efcea9b0e488";
        Assert.assertEquals(excepted, digest);
    }
}