aes 加密和解密

2024-04-10 08:21:53

package com.example.myapp.commons.utils.aes;

public class AESTester {

    static String key;

    static {
        try {
            key = AESUtils.getSecretKey();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws Exception {
        long begin = System.currentTimeMillis();
        encryptFile();
        decryptFile();
        test();
        long end = System.currentTimeMillis();
        System.err.println("耗时：" + (end-begin)/1000 + "秒");
    }

    static void encryptFile() throws Exception {
        String sourceFilePath = "D:/aa/11.txt";
        String destFilePath = "D:/aa/en_11.txt";
        AESUtils.encryptFile(key, sourceFilePath, destFilePath);
    }

    static void decryptFile() throws Exception {
        String sourceFilePath = "D:/aa/en_11.txt";
        String destFilePath = "D:/aa/de_11.txt";
        AESUtils.decryptFile(key, sourceFilePath, destFilePath);
    }

    static void test() throws Exception {
        String source = "这是一行测试DES加密/解密的文字，你看完也等于没看，是不是啊？！";
        System.err.println("原文:\t" + source);
        byte[] inputData = source.getBytes();
        inputData = AESUtils.encrypt(inputData, key);
        System.err.println("加密后:\t" + Base64Util.encode(inputData));
        byte[] outputData = AESUtils.decrypt(inputData, key);
        String outputStr = new String(outputData);
        System.err.println("解密后:\t" + outputStr);
    }

}

package com.example.myapp.commons.utils.aes;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/**
 * <p>
 * AES加密解密工具包
 * </p>
 *
 * @author IceWee
 * @date 2012-5-18
 * @version 1.0
 */
public class AESUtils {

    private static final String ALGORITHM = "AES";
    private static final int KEY_SIZE = 128;
    private static final int CACHE_SIZE = 1024;

    /**
     * <p>
     * 生成随机密钥
     * </p>
     *
     * @return
     * @throws Exception
     */
    public static String getSecretKey() throws Exception {
        return getSecretKey(null);
    }

    /**
     * <p>
     * 生成密钥
     * </p>
     *
     * @param seed 密钥种子
     * @return
     * @throws Exception
     */
    public static String getSecretKey(String seed) throws Exception {
        KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM);
        SecureRandom secureRandom;
        if (seed != null && !"".equals(seed)) {
            secureRandom = new SecureRandom(seed.getBytes());
        } else {
            secureRandom = new SecureRandom();
        }
        keyGenerator.init(KEY_SIZE, secureRandom);
        SecretKey secretKey = keyGenerator.generateKey();
        return Base64Util.encode(secretKey.getEncoded());
    }

    /**
     * <p>
     * 加密
     * </p>
     *
     * @param data
     * @param key
     * @return
     * @throws Exception
     */
    public static byte[] encrypt(byte[] data, String key) throws Exception {
        Key k = toKey(Base64Util.decode(key));
        byte[] raw = k.getEncoded();
        SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
        return cipher.doFinal(data);
    }

    /**
     * <p>
     * 文件加密
     * </p>
     *
     * @param key
     * @param sourceFilePath
     * @param destFilePath
     * @throws Exception
     */
    public static void encryptFile(String key, String sourceFilePath, String destFilePath) throws Exception {
        File sourceFile = new File(sourceFilePath);
        File destFile = new File(destFilePath);
        if (sourceFile.exists() && sourceFile.isFile()) {
            if (!destFile.getParentFile().exists()) {
                destFile.getParentFile().mkdirs();
            }
            destFile.createNewFile();
            InputStream in = new FileInputStream(sourceFile);
            OutputStream out = new FileOutputStream(destFile);
            Key k = toKey(Base64Util.decode(key));
            byte[] raw = k.getEncoded();
            SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
            CipherInputStream cin = new CipherInputStream(in, cipher);
            byte[] cache = new byte[CACHE_SIZE];
            int nRead = 0;
            while ((nRead = cin.read(cache)) != -1) {
                out.write(cache, 0, nRead);
                out.flush();
            }
            out.close();
            cin.close();
            in.close();
        }
    }

    /**
     * <p>
     * 解密
     * </p>
     *
     * @param data
     * @param key
     * @return
     * @throws Exception
     */
    public static byte[] decrypt(byte[] data, String key) throws Exception {
        Key k = toKey(Base64Util.decode(key));
        byte[] raw = k.getEncoded();
        SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
        return cipher.doFinal(data);
    }

    /**
     * <p>
     * 文件解密
     * </p>
     *
     * @param key
     * @param sourceFilePath
     * @param destFilePath
     * @throws Exception
     */
    public static void decryptFile(String key, String sourceFilePath, String destFilePath) throws Exception {
        File sourceFile = new File(sourceFilePath);
        File destFile = new File(destFilePath);
        if (sourceFile.exists() && sourceFile.isFile()) {
            if (!destFile.getParentFile().exists()) {
                destFile.getParentFile().mkdirs();
            }
            destFile.createNewFile();
            FileInputStream in = new FileInputStream(sourceFile);
            FileOutputStream out = new FileOutputStream(destFile);
            Key k = toKey(Base64Util.decode(key));
            byte[] raw = k.getEncoded();
            SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
            CipherOutputStream cout = new CipherOutputStream(out, cipher);
            byte[] cache = new byte[CACHE_SIZE];
            int nRead = 0;
            while ((nRead = in.read(cache)) != -1) {
                cout.write(cache, 0, nRead);
                cout.flush();
            }
            cout.close();
            out.close();
            in.close();
        }
    }

    /**
     * <p>
     * 转换密钥
     * </p>
     *
     * @param key
     * @return
     * @throws Exception
     */
    private static Key toKey(byte[] key) throws Exception {
        SecretKey secretKey = new SecretKeySpec(key, ALGORITHM);
        return secretKey;
    }

}

package com.example.myapp.commons.utils.aes;



import java.io.UnsupportedEncodingException;
import java.util.Base64;


public class Base64Util {

    /**
     * 将字符串转为Base64编码
     *
     * @param a
     * @return
     */
    public static String encode(String a) {
        final Base64.Encoder encoder = Base64.getEncoder();
        byte[] textByte;
        try {
            textByte = a.getBytes("UTF-8");
            return encoder.encodeToString(textByte);
        } catch (UnsupportedEncodingException e) {
           e.printStackTrace();
        }
        return null;
    }

    public static String encode(byte[] textByte) {
        final Base64.Encoder encoder = Base64.getEncoder();
        try {
            return encoder.encodeToString(textByte);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

//    /**
//     * 将 Base64编码串转换为字符串
//     *
//     * @param a
//     * @return
//     */
//    public static String decode(String a) {
//        final Base64.Decoder decoder = Base64.getDecoder();
//        try {
//            return new String(decoder.decode(a), "UTF-8");
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
//        return a;
//    }

    /**
     * 将 Base64编码串转换为字符串
     *
     * @param a
     * @return
     */
    public static byte[] decode(String a) {
        final Base64.Decoder decoder = Base64.getDecoder();
        try {
            return decoder.decode(a);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}
测试结果

原文:   这是一行测试DES加密/解密的文字，你看完也等于没看，是不是啊？！
加密后:   DzP8IxJD5RnOeeJYc8ZpMChOD/r/rIMElhliDJxAkRvoeLCOa62aIP0r9cVo315BRCeCy+MwTbpXhSqb+O/XgXkm2UI9sdqGCITufcoQdMhVEoFI8v3O/c545Jg0ztlv
解密后:   这是一行测试DES加密/解密的文字，你看完也等于没看，是不是啊？！
耗时：0秒

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