java实现的AES加密算法完整实例_JAVA教程

java实现的AES加密算法完整实例

2020-05-29 14:31lee JAVA教程

这篇文章主要介绍了java实现的AES加密算法,结合完整实例形式分析了AES加密类的实现技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了java实现的AES加密算法。分享给大家供大家参考，具体如下：

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									import javax.crypto.Cipher;

									import javax.crypto.spec.IvParameterSpec;

									import javax.crypto.spec.SecretKeySpec;

									import android.util.Base64;

									/**

									 * @author vipin.cb , vipin.cb@experionglobal.com <br>

									 *     Sep 27, 2013, 5:18:34 PM <br>

									 *     Package:- <b>com.veebow.util</b> <br>

									 *     Project:- <b>Veebow</b>

									 *     <p>

									 */

									public class AESCrypt {

									  private final Cipher cipher;

									  private final SecretKeySpec key;

									  private AlgorithmParameterSpec spec;

									  public static final String SEED_16_CHARACTER = "U1MjU1M0FDOUZ.Qz";

									  public AESCrypt() throws Exception {

									    // hash password with SHA-256 and crop the output to 128-bit for key

									    MessageDigest digest = MessageDigest.getInstance("SHA-256");

									    digest.update(SEED_16_CHARACTER.getBytes("UTF-8"));

									    byte[] keyBytes = new byte[32];

									    System.arraycopy(digest.digest(), 0, keyBytes, 0, keyBytes.length);

									    cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

									    key = new SecretKeySpec(keyBytes, "AES");

									    spec = getIV();

									  }

									  public AlgorithmParameterSpec getIV() {

									    byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };

									    IvParameterSpec ivParameterSpec;

									    ivParameterSpec = new IvParameterSpec(iv);

									    return ivParameterSpec;

									  }

									  public String encrypt(String plainText) throws Exception {

									    cipher.init(Cipher.ENCRYPT_MODE, key, spec);

									    byte[] encrypted = cipher.doFinal(plainText.getBytes("UTF-8"));

									    String encryptedText = new String(Base64.encode(encrypted,

									        Base64.DEFAULT), "UTF-8");

									    return encryptedText;

									  }

									  public String decrypt(String cryptedText) throws Exception {

									    cipher.init(Cipher.DECRYPT_MODE, key, spec);

									    byte[] bytes = Base64.decode(cryptedText, Base64.DEFAULT);

									    byte[] decrypted = cipher.doFinal(bytes);

									    String decryptedText = new String(decrypted, "UTF-8");

									    return decryptedText;

									  }

									}