[Java]MD5, SHA-256などのハッシュ値を計算する

SHA-256 ハッシュ値を計算する

src/main/java/com/example/Example.java

package com.example;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Example {

    public static void main(String[] args) throws NoSuchAlgorithmException {
        MessageDigest digest= MessageDigest.getInstance("SHA-256");
        byte[] bytes = digest.digest("ABCDEFG".getBytes());
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            sb.append(String.format("%02x", b));
        }
        System.out.println(sb.toString());
    }

}

実行結果

$ mvn -q compile exec:java -Dexec.mainClass=com.example.Example
e9a92a2ed0d53732ac13b031a27b071814231c8633c9f41844ccba884d482b16

MD5 ハッシュ値を計算する

src/main/java/com/example/Example.java

package com.example;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Example {

    public static void main(String[] args) throws NoSuchAlgorithmException {
        MessageDigest digest= MessageDigest.getInstance("MD5");
        byte[] bytes = digest.digest("ABCDEFG".getBytes());
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            sb.append(String.format("%02x", b));
        }
        System.out.println(sb.toString());
    }

}

実行結果

$ mvn -q compile exec:java -Dexec.mainClass=com.example.Example
bb747b3df3130fe1ca4afa93fb7d97c9