Java AES：使用单个 ID 作为源生成密钥

Question

我需要生成一个 Key 以便使用它使用 AES 密码进行加密和解密。

密钥必须在运行时使用单个 id 值生成。

如何以单个字符串作为源生成 Key？

Answer 1

希望对您有所帮助。

package com.lahiru.security;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class AESEncryptionDecryption {

    private static SecretKeySpec secretKey;
    private static byte[] key;

    public static void main(String[] args){
        String id = "00001";
        String plainText = "This is plain text";

        String cipherText = encrypt(plainText, id);
        System.out.println("Cipher Text after encrption ::: " + cipherText);
        System.out.println("Plain Text after decryption ::: " + decrypt(cipherText, id));

    }


    public static void setKey(String myKey) 
    {
        MessageDigest sha = null;
        try {
            key = myKey.getBytes("UTF-8");
            sha = MessageDigest.getInstance("SHA-1");
            key = sha.digest(key);
            key = Arrays.copyOf(key, 16); 
            secretKey = new SecretKeySpec(key, "AES");
        } 
        catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } 
        catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }

    public static String encrypt(String strToEncrypt, String secret) 
    {
        try
        {
            setKey(secret);
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
        } 
        catch (Exception e) 
        {
            System.out.println("Error while encrypting: " + e.toString());
        }
        return null;
    }

    public static String decrypt(String strToDecrypt, String secret) 
    {
        try
        {
            setKey(secret);
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
        } 
        catch (Exception e) 
        {
            System.out.println("Error while decrypting: " + e.toString());
        }
        return null;
    }
}

Java AES：使用单个 ID 作为源生成密钥

Java AES: Generate Key using a single id as source

java

encryption

java-security