AES 对称加密
1 package com.skynet.rimp.common.utils.string; 2 3 import java.io.UnsupportedEncodingException; 4 import java.security.InvalidKeyException; 5 import java.security.NoSuchAlgorithmException; 6 import java.security.SecureRandom; 7 8 import javax.crypto.BadPaddingException; 9 import javax.crypto.Cipher; 10 import javax.crypto.IllegalBlockSizeException; 11 import javax.crypto.KeyGenerator; 12 import javax.crypto.NoSuchPaddingException; 13 import javax.crypto.SecretKey; 14 import javax.crypto.spec.SecretKeySpec; 15 16 public class AESUtil { 17 18 private static final String key = "yunyou17lw"; 19 20 /** 21 * 加密 22 * @param content 需要加密的内容 23 * @param password 加密密码 24 * @return 25 */ 26 private static byte[] encryptByte(String content, String password) { 27 try { 28 KeyGenerator kgen = KeyGenerator.getInstance("AES"); 29 kgen.init(128, new SecureRandom(password.getBytes())); 30 SecretKey secretKey = kgen.generateKey(); 31 byte[] enCodeFormat = secretKey.getEncoded(); 32 SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); 33 Cipher cipher = Cipher.getInstance("AES");// 创建密码器 34 byte[] byteContent = content.getBytes("utf-8"); 35 cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化 36 byte[] result = cipher.doFinal(byteContent); 37 return result; // 加密 38 } catch (NoSuchAlgorithmException e) { 39 e.printStackTrace(); 40 } catch (NoSuchPaddingException e) { 41 e.printStackTrace(); 42 } catch (InvalidKeyException e) { 43 e.printStackTrace(); 44 } catch (UnsupportedEncodingException e) { 45 e.printStackTrace(); 46 } catch (IllegalBlockSizeException e) { 47 e.printStackTrace(); 48 } catch (BadPaddingException e) { 49 e.printStackTrace(); 50 } 51 return null; 52 } 53 54 /** 55 * 解密 56 * @param content 待解密内容 57 * @param password 解密密钥 58 * @return 59 */ 60 private static byte[] decryptByte(byte[] content, String password) { 61 try { 62 KeyGenerator kgen = KeyGenerator.getInstance("AES"); 63 kgen.init(128, new SecureRandom(password.getBytes())); 64 SecretKey secretKey = kgen.generateKey(); 65 byte[] enCodeFormat = secretKey.getEncoded(); 66 SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); 67 Cipher cipher = Cipher.getInstance("AES");// 创建密码器 68 cipher.init(Cipher.DECRYPT_MODE, key);// 初始化 69 byte[] result = cipher.doFinal(content); 70 return result; // 加密 71 } catch (NoSuchAlgorithmException e) { 72 e.printStackTrace(); 73 } catch (NoSuchPaddingException e) { 74 e.printStackTrace(); 75 } catch (InvalidKeyException e) { 76 e.printStackTrace(); 77 } catch (IllegalBlockSizeException e) { 78 e.printStackTrace(); 79 } catch (BadPaddingException e) { 80 e.printStackTrace(); 81 } 82 return null; 83 } 84 85 /** 86 * AES加密 87 * @param str 88 * @return 89 */ 90 public static String encrypt(String str) { 91 return BinaryHex.binary2Hex(encryptByte(str, key)); 92 } 93 94 /** 95 * AES解密 96 * @param str 97 * @return 98 */ 99 public static String decrypt(String str) throws UnsupportedEncodingException { 100 // 16进制转2进制 101 byte[] decryptFrom = BinaryHex.hex2Byte(str); 102 // 根据byte进行解码 103 byte[] decryptResult = decryptByte(decryptFrom, key); 104 return new String(decryptResult,"UTF-8"); 105 } 106 107 public static void main(String[] args) throws UnsupportedEncodingException { 108 String str = "发多少房间打扫看来减肥鲁大师 <br>///fdsfds房贷首付斯蒂芬是"; 109 // 加密 110 System.out.println("加密前：" + str); 111 String s = AESUtil.encrypt(str); 112 System.out.println("加密后：" + s); 113 114 System.out.println("解密后：" + AESUtil.decrypt(s)); 115 } 116 }
1 package com.skynet.rimp.common.utils.string; 2 3 /** 4 * 2进制/16进制互转 5 * 6 * @author Jieven 7 * @date 2014-5-12 8 */ 9 public class BinaryHex { 10 11 /** 12 * 2进制转16进制 13 * @param bString 2进制字符串 14 * @return 15 */ 16 public static String binary2Hex(String bString) { 17 if (bString == null || bString.equals("") || bString.length() % 8 != 0) 18 return null; 19 StringBuffer tmp = new StringBuffer(); 20 int iTmp = 0; 21 for (int i = 0; i < bString.length(); i += 4) { 22 iTmp = 0; 23 for (int j = 0; j < 4; j++) { 24 iTmp += Integer.parseInt(bString.substring(i + j, i + j + 1)) << (4 - j - 1); 25 } 26 tmp.append(Integer.toHexString(iTmp)); 27 } 28 return tmp.toString(); 29 } 30 31 /** 32 * 16进制转2进制 33 * @param hexString 34 * @return 35 */ 36 public static String hex2Binary(String hexString) { 37 if (hexString == null || hexString.length() % 2 != 0) 38 return null; 39 String bString = "", tmp; 40 for (int i = 0; i < hexString.length(); i++) { 41 tmp = "0000" + Integer.toBinaryString(Integer.parseInt(hexString.substring(i, i + 1), 16)); 42 bString += tmp.substring(tmp.length() - 4); 43 } 44 return bString; 45 } 46 47 /** 48 * 将二进制转换成16进制 49 * @param buf 50 * @return 51 */ 52 public static String binary2Hex(byte buf[]) { 53 StringBuffer sb = new StringBuffer(); 54 for (int i = 0; i < buf.length; i++) { 55 String hex = Integer.toHexString(buf[i] & 0xFF); 56 if (hex.length() == 1) { 57 hex = '0' + hex; 58 } 59 sb.append(hex.toUpperCase()); 60 } 61 return sb.toString(); 62 } 63 64 /** 65 * 将16进制转换为二进制 66 * @param hexStr 67 * @return 68 */ 69 public static byte[] hex2Byte(String hexStr) { 70 if (hexStr.length() < 1) 71 return null; 72 byte[] result = new byte[hexStr.length() / 2]; 73 for (int i = 0; i < hexStr.length() / 2; i++) { 74 int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16); 75 int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16); 76 result[i] = (byte) (high * 16 + low); 77 } 78 return result; 79 } 80 81 public static void main(String[] args) { 82 String bString = "1010101111001101"; 83 System.out.println(binary2Hex(bString)); 84 85 String hexString = "ABCD"; 86 System.out.println(hex2Binary(hexString)); 87 } 88 }
一共两个类，可制作成工具类
