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程序员辅导--javaAES算法
发布时间:2010/1/13 21:31:15 来源:www.xue.net 编辑:城市总裁吧

  package com.rsa;
  import java.security.InvalidAlgorithmParameterException;
  import java.security.InvalidKeyException;
  import java.security.NoSuchAlgorithmException;
  import java.security.SecureRandom;
  import java.security.spec.AlgorithmParameterSpec;
  import javax.crypto.BadPaddingException;
  import javax.crypto.Cipher;
  import javax.crypto.IllegalBlockSizeException;
  import javax.crypto.KeyGenerator;
  import javax.crypto.NoSuchPaddingException;
  import javax.crypto.SecretKey;
  import javax.crypto.spec.IvParameterSpec;
  public class AESEncrypter {
  public static byte[] iv = new byte[] { 82, 22, 50, 44, -16, 124, -40, -114, -87, -40, 37, 23, -56, 23, -33, 75 };
  private static AESEncrypter aes = null;
  public static byte[] key1 = new byte[] { -42, 35, 67, -86, 19, 29, -11, 84, 94, 111, 75, -104, 71, 46, 86, -21, -119, 110, -11, -32, -28, 91, -33, -46, 99, 49, 2, 66, -101, -11, -8, 56 };
  private AESEncrypter() {
  }
  public static synchronized AESEncrypter getInstance() {
  if (aes == null) {
  aes = new AESEncrypter();
  }
  return aes;
  }
  public String encrypt(String msg) {
  String str = "";
  try {
  KeyGenerator kgen = KeyGenerator.getInstance("AES");
  kgen.init(128, new SecureRandom(key1));
  AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
  SecretKey key = kgen.generateKey();
  Cipher ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
  ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
  str = asHex(ecipher.doFinal(msg.getBytes()));
  } catch (BadPaddingException e) {
  e.printStackTrace();
  } catch (NoSuchAlgorithmException e) {
  e.printStackTrace();
  } catch (NoSuchPaddingException e) {
  e.printStackTrace(); [NextPage]

  } catch (InvalidKeyException e) {
  e.printStackTrace();
  } catch (InvalidAlgorithmParameterException e) {
  e.printStackTrace();
  } catch (IllegalBlockSizeException e) {
  e.printStackTrace();
  }
  return str;
  }
  public String decrypt(String value) {
  try {
  KeyGenerator kgen = KeyGenerator.getInstance("AES");
  kgen.init(128, new SecureRandom(key1));
  AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
  SecretKey key = kgen.generateKey();
  Cipher dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
  dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
  return new String(dcipher.doFinal(asBin(value)));
  } catch (BadPaddingException e) {
  e.printStackTrace();
  } catch (NoSuchAlgorithmException e) {
  e.printStackTrace();
  } catch (NoSuchPaddingException e) {
  e.printStackTrace();
  } catch (InvalidKeyException e) {
  e.printStackTrace();
  } catch (InvalidAlgorithmParameterException e) {
  e.printStackTrace();
  } catch (IllegalBlockSizeException e) {
  e.printStackTrace();
  }
  return "";
  }
  private String asHex(byte buf[]) {
  StringBuffer strbuf = new StringBuffer(buf.length * 2);
  int i;
  for (i = 0; i < buf.length; i++) {
  if (((int) buf[i] & 0xff) < 0x10)
  strbuf.append("0");
  strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
  }
  return strbuf.toString();
  }
  private byte[] asBin(String src) {
  if (src.length() < 1)
  return null;
  byte[] encrypted = new byte[src.length() / 2];
  for (int i = 0; i < src.length() / 2; i++) {
  int high = Integer.parseInt(src.substring(i * 2, i * 2 + 1), 16);
  int low = Integer.parseInt(src.substring(i * 2 + 1, i * 2 + 2), 16);
  encrypted[i] = (byte) (high * 16 + low);
  }
  return encrypted;
  }
  public static void main(String args[]) {
  String str = AESEncrypter.getInstance().encrypt("192.168.30.193.123");
  System.out.println(str);
  System.out.println(AESEncrypter.getInstance().decrypt(str));
  }
  }

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