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java AES 加密 解密
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package ;import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import java.util.Date;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.SecretKeySpec;/** * @author WHD */public class AesUtil { private static final String AES="AES"; private static final String UTF8="UTF-8"; static KeyGenerator kgen =null; static{ try {kgen= KeyGenerator.getInstance(AES); } catch (NoSuchAlgorithmException e) {// TODO Auto-generated catch blocke.printStackTrace(); } } /* * @param content: * @param password: */ private static byte[] encrypt(String content, String password) { try {// 使用静态代码块来生成KeyGenerator对象//KeyGenerator kgen = KeyGenerator.getInstance(AES);// 使用128 位kgen.init(128, new SecureRandom(password.getBytes()));SecretKey secretKey = kgen.generateKey();byte[] encodeFormat = secretKey.getEncoded();SecretKeySpec key = new SecretKeySpec(encodeFormat, AES);// Cipher对象实际完成加密操作Cipher cipher = Cipher.getInstance(AES);// 加密内容进行编码byte[] byteContent = content.getBytes(UTF8);// 用密匙初始化Cipher对象cipher.init(Cipher.ENCRYPT_MODE, key);// 正式执行加密操作byte[] result = cipher.doFinal(byteContent);return result; } catch (NoSuchAlgorithmException e) {e.printStackTrace(); } catch (NoSuchPaddingException e) {e.printStackTrace(); } catch (InvalidKeyException e) {e.printStackTrace(); } catch (UnsupportedEncodingException e) {e.printStackTrace(); } catch (IllegalBlockSizeException e) {e.printStackTrace(); } catch (BadPaddingException e) {e.printStackTrace(); } return null; } /* * @param content: * @param password: */ private static byte[] decrypt(byte[] content, String password) { try {// 使用静态代码块来生成KeyGenerator对象//KeyGenerator kgen = KeyGenerator.getInstance(AES);// 使用128 位kgen.init(128, new SecureRandom(password.getBytes()));SecretKey secretKey = kgen.generateKey();byte[] encodeFormat = secretKey.getEncoded();SecretKeySpec key = new SecretKeySpec(encodeFormat, AES);// Cipher对象实际完成加密操作Cipher cipher = Cipher.getInstance(AES);// 用密匙初始化Cipher对象cipher.init(Cipher.DECRYPT_MODE, key);// 正式执行解密操作byte[] result = cipher.doFinal(content);return result; } catch (NoSuchAlgorithmException e) {e.printStackTrace(); } catch (NoSuchPaddingException e) {e.printStackTrace(); } catch (InvalidKeyException e) {e.printStackTrace(); } catch (IllegalBlockSizeException e) {e.printStackTrace(); } catch (BadPaddingException e) {e.printStackTrace(); } return null; } /** * 二进制--》十六进制转化 * @param buf * @return */ private 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 = + hex;}sb.append(hex.toUpperCase()); } return sb.toString(); } /** * 十六进制--》二进制转化 * @param hexStr * @return */ private 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; } public static void main(String[] args) throws UnsupportedEncodingException { long begin=new Date().getTime(); String content = "aaades加密测试"; String password = "12345678dd"; // 加密 System.out.println("加密前：" + content); byte[] encryptResult = encrypt(content, password); String encryptResultStr = parseByte2HexStr(encryptResult); System.out.println("加密后：" + encryptResultStr); // 解密 byte[] decryptFrom = parseHexStr2Byte(encryptResultStr); byte[] decryptResult = decrypt(decryptFrom, password); // 解密内容进行解码 String result = new String(decryptResult, UTF8); System.out.println("解密后：" + result); long end= new Date().getTime(); System.out.println(end-begin); }}
注：SecureRandom是生成安全随机数序列，password.getBytes()是种子，只要种子相同，序列就一样，所以解密只要有password就行，可以复原这个序列。
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