AES
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2022-06-21 20:38:10
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package com.forever.util; import java.io.UnsupportedEncodingException; 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; public class AES { //KeyGenerator 提供对称密钥生成器的功能,支持各种算法 private KeyGenerator keygen; //SecretKey 负责保存对称密钥 private SecretKey deskey; //Cipher负责完成加密或解密工作 private Cipher c; //该字节数组负责保存加密的结果 private byte[] cipherByte; private static final String password = "12345678"; // 配置文件 public AES() 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"); keygen.init(128, new SecureRandom(password.getBytes())); //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 * @throws UnsupportedEncodingException */ public byte[] Encrytor(String str) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException { // 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 cipherByte; } public String encrytor(String str) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException{ return parseByte2HexStr(Encrytor(str)); } /** * 对字符串解密 * * @param buff * @return * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException */ public byte[] Decryptor(byte[] 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(buff); return cipherByte; } public String decryptor(String str) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException{ return new String(Decryptor(parseHexStr2Byte(str))); } /**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; } /** * @param args * @throws NoSuchPaddingException * @throws NoSuchAlgorithmException * @throws BadPaddingException * @throws IllegalBlockSizeException * @throws InvalidKeyException */ public static void main(String[] args) throws Exception { AES de1 = new AES(); String msg ="三大"; byte[] encontent = de1.Encrytor(msg); byte[] decontent = de1.Decryptor(encontent); System.out.println("明文是:" + msg); System.out.println("加密后:" + new String(parseByte2HexStr(encontent))); System.out.println("解密后:" + new String(decontent)); System.out.println("------------"); System.out.println("明文是:" + msg); String e = de1.encrytor(msg); System.out.println("加密后:" + e); String d = de1.decryptor(e); System.out.println("解密后:" + d); } }