package com.tr.common.util.encrypt; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; import java.security.Security; 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 com.tr.ODJ.util.Constants; /** * AES 加密解密类 * * * */ public class EncrypAES { // KeyGenerator 提供对称密钥生成器的功能,支持各种算法 private static KeyGenerator keygen; // SecretKey 负责保存对称密钥 private static SecretKey deskey; // Cipher负责完成加密或解密工作 private static Cipher c; // 该字节数组负责保存加密的结果 private static byte[] cipherByte; static { Security.addProvider(new com.sun.crypto.provider.SunJCE()); // 实例化支持DES算法的密钥生成器(算法名称命名需按规定,否则抛出异常) try { keygen = KeyGenerator.getInstance("AES"); } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } // 生成密钥 keygen.init(new SecureRandom("这是密匙".getBytes())); deskey = keygen.generateKey(); // 生成Cipher对象,指定其支持的DES算法 try { c = Cipher.getInstance("AES"); } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (NoSuchPaddingException e) { // TODO Auto-generated catch block e.printStackTrace(); } } // public EncrypAES() throws NoSuchAlgorithmException, NoSuchPaddingException { // Security.addProvider(new com.sun.crypto.provider.SunJCE()); // // 实例化支持DES算法的密钥生成器(算法名称命名需按规定,否则抛出异常) // keygen = KeyGenerator.getInstance("AES"); // // 生成密钥 // deskey = keygen.generateKey(); // // 生成Cipher对象,指定其支持的DES算法 // c = Cipher.getInstance("AES"); // } /** * 对字符串加密 * * @param str * @return * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException */ public static String Encrytor(String str) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException { // 根据密钥,对Cipher对象进行初始化,ENCRYPT_MODE表示加密模式 c.init(Cipher.ENCRYPT_MODE, deskey); byte[] src = str.getBytes(); // 加密,结果保存进cipherByte cipherByte = c.doFinal(src); return parseByte2HexStr(cipherByte); } /** * 对字符串解密 * * @param buff * @return * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException */ public static String Decryptor(String buff) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException { // 根据密钥,对Cipher对象进行初始化,DECRYPT_MODE表示加密模式 c.init(Cipher.DECRYPT_MODE, deskey); cipherByte = c.doFinal(parseHexStr2Byte(buff)); return new String(cipherByte); } /** * @param args * @throws NoSuchPaddingException * @throws NoSuchAlgorithmException * @throws BadPaddingException * @throws IllegalBlockSizeException * @throws InvalidKeyException */ public static void main(String[] args) throws Exception { EncrypAES de1 = new EncrypAES(); String msg ="lp;l;l;jmhj"; String encontent = de1.Encrytor(msg); String decontent = de1.Decryptor(encontent); System.out.println("明文是:" + msg); System.out.println("加密后:" + new String(encontent)); System.out.println("解密后:" + new String(decontent)); } /** * 将二进制转换成16进制 * * @param buf * @return */ public static String parseByte2HexStr(byte buf[]) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < buf.length; i++) { String hex = Integer.toHexString(buf[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } sb.append(hex.toUpperCase()); } return sb.toString(); } /** * 将16进制转换为二进制 * * @param hexStr * @return */ public static byte[] parseHexStr2Byte(String hexStr) { if (hexStr.length() < 1) return null; byte[] result = new byte[hexStr.length() / 2]; for (int i = 0; i < hexStr.length() / 2; i++) { int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16); int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16); result[i] = (byte) (high * 16 + low); } return result; } }
java AES加密拿来即用,实行对汉字的转化
时间: 2024-11-05 16:40:02