AES 192加密

/*** leijid** Test.java** 2014年9月19日*/package com.self.util;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.security.NoSuchAlgorithmException;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;/*** @author leijid**/public class Test {private static final String AES = "AES";private static final String ENCODING = "UTF-8";private static final String AES_ECB_PADDING = "AES/ECB/NoPadding";private static final int AES_KEY_LENGTH = 192;private static final String AES_KEY_FILE = "c:\\aes.key";private static final char PADDING_CHARACTER = '*';public static void main(String[] args) {byte[] encryptResult = encryptAES(addPadding("测试AES192加密算法", 16),AES_KEY_LENGTH);System.out.println(parseByte2HexStr(encryptResult));byte[] decryptResult = decryptAES(encryptResult, AES_KEY_LENGTH);String resultStr = byte2String(decryptResult);System.out.println(noPadding(resultStr, PADDING_CHARACTER));}public static byte[] encryptAES(String content, int keySize) {try {SecretKeySpec spec = getAESKeySpec(keySize);Cipher cipher = Cipher.getInstance(AES_ECB_PADDING);cipher.init(Cipher.ENCRYPT_MODE, spec);byte[] byteContent = string2Byte(content);byte[] result = cipher.doFinal(byteContent);return result;} catch (Exception e) {System.out.println("AES加密失败" + e);}return null;}public static byte[] decryptAES(byte[] content, int keySize) {try {SecretKeySpec spec = getAESKeySpec(keySize);Cipher cipher = Cipher.getInstance(AES_ECB_PADDING);cipher.init(Cipher.DECRYPT_MODE, spec);byte[] result = cipher.doFinal(content);return result;} catch (Exception e) {System.out.println("AES解密失败" + e);}return null;}public static String parseByte2HexStr(byte[] b) {StringBuffer sb = new StringBuffer();for (int i = 0; i < b.length; i++) {String hex = Integer.toHexString(b[i] & 0xFF);if (hex.length() == 1) {hex = "0" + hex;}sb.append(hex);}return sb.toString().toUpperCase();}/*** 填充字符** @param str* @param length* @return*/private static String addPadding(String str, int length) {return padding(str, PADDING_CHARACTER, length, 0);}private static String padding(String str, char ch, int length, int i) {if (str == null || str.length() == 0) {return null;}int strLen = string2Byte(str).length;StringBuffer sb = new StringBuffer();if (strLen % length == 0) {String paddingLen = String.valueOf(i);str = str.substring(0, str.length() - paddingLen.length());sb.append(str).append(i);return sb.toString();} else {String paddingStr = sb.append(str).append(ch).toString();return padding(paddingStr, ch, length, i + 1);}}/*** 移除填充字符** @param str* @param ch* @return*/private static String noPadding(String str, char ch) {if (str == null || str.length() == 0) {return null;}int len = str.length();String subStr = str.substring(str.lastIndexOf(ch) + 1, len);String resultStr = str.substring(0, len - Integer.parseInt(subStr));return resultStr;}/**** @param keySize* 密钥长度* @return* @throws Exception*/private static SecretKeySpec getAESKeySpec(int keySize) throws Exception {if ((keySize != 128) && (keySize != 192) && (keySize != 256)) {throw new Exception("加密的keySize错误!");}byte[] bytes = new byte[keySize / 8];File f = new File(AES_KEY_FILE);if (f.exists()) {readAESKeyFile(bytes, f);} else {bytes = wirteAESKeyFile(keySize, bytes, f);}SecretKeySpec spec = new SecretKeySpec(bytes, AES);return spec;}/*** 读取密钥文件** @param bytes* @param f*/private static void readAESKeyFile(byte[] bytes, File f) {FileInputStream in = null;try {in = new FileInputStream(f);in.read(bytes);} catch (FileNotFoundException e) {System.out.println("未找到AES加解密所需的KEY" + e);} catch (IOException e) {System.out.println("读取AES加解密所需的KEY失败" + e);} finally {closeStream(in, null);}}/*** 生成密钥文件** @param keySize* @param bytes* @param f* @return*/private static byte[] wirteAESKeyFile(int keySize, byte[] bytes, File f) {SecretKey key;KeyGenerator kgen;FileOutputStream out = null;try {kgen = KeyGenerator.getInstance(AES);kgen.init(keySize);key = kgen.generateKey();bytes = key.getEncoded();out = new FileOutputStream(f);out.write(bytes);} catch (NoSuchAlgorithmException e) {System.out.println("没有该加解密算法" + e);} catch (FileNotFoundException e) {System.out.println("未找到AES加解密所需的KEY" + e);} catch (IOException e) {System.out.println("生成AES加解密所需的KEY失败" + e);} finally {closeStream(null, out);}return bytes;}private static byte[] string2Byte(String str) {byte[] b = null;try {b = str.getBytes(ENCODING);} catch (UnsupportedEncodingException e) {System.out.println("不支持该种编码方式" + e);}return b;}public static String byte2String(byte[] bytes) {String str = null;try {str = new String(bytes, ENCODING);} catch (UnsupportedEncodingException e) {System.out.println("不支持该种编码方式" + e);}return str;}private static void closeStream(InputStream in, OutputStream out) {if (in != null) {try {in.close();} catch (IOException e) {System.out.println("输入流关闭异常" + e);}}if (out != null) {try {out.close();} catch (IOException e) {System.out.println("输出流关闭异常" + e);}}}}