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import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESedeKeySpec; import javax.crypto.spec.IvParameterSpec; /** * 三重加密 3DES也作 Triple DES,* * @author stone * @date 2014-03-10 02:14:37 */ public class TripleDES { // 算法名称 public static final String KEY_ALGORITHM = "DESede"; // 算法名称/加密模式/填充方式 public static final String CIPHER_ALGORITHM_ECB = "DESede/ECB/PKCS5Padding"; public static final String CIPHER_ALGORITHM_CBC = "DESede/CBC/PKCS5Padding"; private KeyGenerator keyGen; private SecretKey secretKey; private SecretKey secretKey2; private Cipher cipher; private static byte[] encryptData; public static void main(String[] args) throws Exception { TripleDES tripleDES = new TripleDES("ECB"); tripleDES.encrypt("sau8jzxlcvm,'123`98(*^&%^^JCB ZX>>A<S<}}{"); System.out.println("加密后:" + new String(encryptData)); System.out.println("解密后:"+ new String(tripleDES.decrypt(encryptData))); tripleDES = new TripleDES("CBC"); tripleDES.encrypt2("sau8jzxlc DQV#><«|vm,'123`98(*^&%^^JCB ZX>>A<S<}}{"); System.out.println("加密后:" + new String(encryptData)); System.out.println("解密后:"+ new String(tripleDES.decrypt2(encryptData))); } public TripleDES(String mode) throws Exception { if ("ECB".equals(mode)) { // cipher = Cipher.getInstance(KEY_ALGORITHM); cipher = Cipher.getInstance(CIPHER_ALGORITHM_ECB); keyGen = KeyGenerator.getInstance(KEY_ALGORITHM); secretKey = keyGen.generateKey(); } else if("CBC".equals(mode)) { cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC); keyGen = KeyGenerator.getInstance(KEY_ALGORITHM); DESedeKeySpec spec = new DESedeKeySpec(keyGen.generateKey().getEncoded()); secretKey2 = SecretKeyFactory.getInstance(KEY_ALGORITHM).generateSecret(spec); } } /** * 加密 * @param str * @return * @throws Exception */ public byte[] encrypt(String str) throws Exception { cipher.init(Cipher.ENCRYPT_MODE,secretKey); return encryptData = cipher.doFinal(str.getBytes()); } /** * 解密 * @param encrypt * @return * @throws Exception */ public byte[] decrypt(byte[] encrypt) throws Exception { cipher.init(Cipher.DECRYPT_MODE,secretKey); return encryptData = cipher.doFinal(encrypt); } byte[] getIV() { return "administ".getBytes(); } /** * 加密 * @param str * @return * @throws Exception */ public byte[] encrypt2(String str) throws Exception { cipher.init(Cipher.ENCRYPT_MODE,secretKey2,new IvParameterSpec(getIV())); return encryptData = cipher.doFinal(str.getBytes()); } /** * 解密 * @param encrypt * @return * @throws Exception */ public byte[] decrypt2(byte[] encrypt) throws Exception { cipher.init(Cipher.DECRYPT_MODE,new IvParameterSpec(getIV())); return encryptData = cipher.doFinal(encrypt); } }
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