Java AES文件和文本加解密

来源：互联网发布：中科院在职研究生知乎编辑：程序博客网时间：2024/04/24 14:16
在项目开发中，有时会遇到对文件进行加密、或者文本进行加密，目前加密方式最好的还是AES方式，AES和DES基本相同，只是位数不同而已，AES具体是怎么加密大家可以自行百度搜搜即可
部分代码：
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 Base64Utils.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(Base64Utils.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(Base64Utils.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(Base64Utils.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(Base64Utils.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;    }    }
下载在源码包
阅读全文
0 0