aes加密工具類

public class AESUtils { //算法/模式/填充 private static final String CipherMode = "AES/CBC/PKCS5Padding"; //秘鑰 private static String DEFAULST_SECURITY_KEY = "69a183bbca2d9a01914d2dfa34455742"; private static final String encodFormat = "UTF-8"; /** * 創建密鑰 * * @param key * @return */ private static SecretKeySpec createKey(String key) { key = key == null ? "" : key; StringBuilder sb = new StringBuilder(16); sb.append(key); while (sb.length() < 16) { sb.append("0"); } if (sb.length() > 16) { sb.setLength(16); } byte[] data = null; try { data = sb.toString().getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return new SecretKeySpec(data, "AES"); } /** * 創建初始化向量 * * @param password * @return */ private static IvParameterSpec createIV(String password) { password = password == null ? "" : password; StringBuilder sb = new StringBuilder(16); sb.append(password); while (sb.length() < 16) { sb.append("0"); } if (sb.length() > 16) { sb.setLength(16); } byte[] data = null; try { data = sb.toString().getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return new IvParameterSpec(data); } /** * AES-128/CBC算法加密字節數據 * * @param content * @param password 密鑰 * @param iv 初始化向量 * @return byte[] */ public static byte[] aes128CBCEncrypt(byte[] content, String password, String iv) { try { Cipher cipher = Cipher.getInstance(CipherMode); cipher.init(Cipher.ENCRYPT_MODE, createKey(password), createIV(iv)); byte[] result = cipher.doFinal(content); return result; } catch (Exception e) { e.printStackTrace(); } return null; } /** * AES-128/CBC算法解密字節數組 * * @param content * @param password 密鑰 * @param iv 初始化向量 * @return byte[] */ public static byte[] aes128CBCDecrypt(byte[] content, String password, String iv) { try { Cipher cipher = Cipher.getInstance(CipherMode); cipher.init(Cipher.DECRYPT_MODE, createKey(password), createIV(iv)); byte[] result = cipher.doFinal(content); return result; } catch (Exception e) { e.printStackTrace(); } return null; } /** * AES-128加密字符串 * * @param content * @return */ public static String encrypt(String content) { try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, new SecureRandom(DEFAULST_SECURITY_KEY.getBytes(encodFormat))); byte[] bytes = kgen.generateKey().getEncoded(); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(bytes, "AES")); byte[] result = cipher.doFinal(content.getBytes(encodFormat)); StringBuffer sb = new StringBuffer(); for (int i = 0; i < result.length; i++) { String hex = Integer.toHexString(result[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } sb.append(hex.toUpperCase()); } return sb.toString(); } catch (Exception e) { e.printStackTrace(); } return null; } /** * AES-128 CBC加密方式， 加密后使用Base64轉碼 * * @param content 待加密內容 * @param encodingFormat * @param key 密鑰 * @param initVector 初始化向量 * @return * @throws Exception */ public static String aesCBCEncrypt(String content, String encodingFormat, String key, String initVector) { try { SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(encodingFormat), "AES"); //使用CBC模式，需要一個向量iv，可增加加密算法的強度 IvParameterSpec vector = new IvParameterSpec(initVector.getBytes(encodingFormat)); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, keySpec, vector); byte[] encrypted = cipher.doFinal(content.getBytes(encodingFormat)); //此處使用BASE64做轉碼。 String result = new BASE64Encoder().encode(encrypted); return result; } catch (Exception e) { e.printStackTrace(); } return null; } /** * AES-128 CBC解密方式 * * @param content 待解密的Base64字符串 * @param encodingFormat * @param key 密鑰 * @param initVector 初始化向量 * @return */ public static String aesCBCDecrypt(String content, String encodingFormat, String key, String initVector) { try { SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(encodingFormat), "AES"); IvParameterSpec vector = new IvParameterSpec(initVector.getBytes()); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, keySpec, vector); //先用base64編碼，因為對應的加密使用Base64解碼 byte[] base64Bytes = new BASE64Decoder().decodeBuffer(content); byte[] original = cipher.doFinal(base64Bytes); String result = new String(original, encodingFormat); return result; } catch (Exception e) { e.printStackTrace(); } return null; } /** * 加密普通內容 * * */ public static String encrypt(String content, String key) { if (isEmpty(key)) { return encrypt(content); } try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, new SecureRandom(key.getBytes(encodFormat))); byte[] bytes = kgen.generateKey().getEncoded(); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(bytes, "AES")); byte[] result = cipher.doFinal(content.getBytes(encodFormat)); StringBuffer sb = new StringBuffer(); for (int i = 0; i < result.length; i++) { String hex = Integer.toHexString(result[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } sb.append(hex.toUpperCase()); } return sb.toString(); } catch (Exception e) { e.printStackTrace(); } return null; } /** * 解密 * * @param content * @return */ public static String decrypt(String content) { if (isEmpty(content)) { return null; } byte[] bytes = new byte[content.length() / 2]; for (int i = 0; i < content.length() / 2; i++) { int high = Integer.parseInt(content.substring(i * 2, i * 2 + 1), 16); int low = Integer.parseInt(content.substring(i * 2 + 1, i * 2 + 2), 16); bytes[i] = (byte) (high * 16 + low); } try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, new SecureRandom(DEFAULST_SECURITY_KEY.getBytes())); SecretKey secretKey = kgen.generateKey(); SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getEncoded(), "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, secretKeySpec); byte[] result = cipher.doFinal(bytes); return new String(result); } catch (Exception e) { e.printStackTrace(); } return null; } /** * 解密 * * @param content * @param securityKey * @return */ public static String decrypt(String content, String securityKey) { if (isEmpty(securityKey)) { return decrypt(content); } byte[] bytes = new byte[content.length() / 2]; for (int i = 0; i < content.length() / 2; i++) { int high = Integer.parseInt(content.substring(i * 2, i * 2 + 1), 16); int low = Integer.parseInt(content.substring(i * 2 + 1, i * 2 + 2), 16); bytes[i] = (byte) (high * 16 + low); } try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, new SecureRandom(securityKey.getBytes())); SecretKey secretKey = kgen.generateKey(); SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getEncoded(), "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, secretKeySpec); byte[] result = cipher.doFinal(bytes); return new String(result); } catch (Exception e) { e.printStackTrace(); } return null; } private static boolean equal(byte[] a1, byte[] a2) { if (a1 != null && a2 != null && a1.length == a2.length) { for (int i = 0; i < a1.length; i++) { if (a1[i] != a2[i]) { return false; } } return true; } return false; } private static boolean isEmpty(String str) { return str == null || str.length() == 0; } public static void main(String... args) throws UnsupportedEncodingException { /* String initVector = "AaBbCcDd1234!@#$"; String key = "WwXxYyZz1234!@#$"; int total = 100000; int run = 0; int count = 0; String[] strArr = new String[]{ "//////\\\\+++、、", "+++、、//////\\++！", "++！@#%￥……，。、……&*（", "【】）&（\\\" + \"中國", "事實上", "&（\\\" + \"中國誰喲的事實上122你的", "12343567"}; Random random = new Random(System.currentTimeMillis()); for (int i = 0; i < total; i++) { run++; StringBuilder builder = new StringBuilder(); builder.append(random.nextInt(strArr.length)); builder.append(random.nextInt(strArr.length)); builder.append(random.nextInt(strArr.length)); builder.append(random.nextInt(strArr.length)); builder.append(random.nextInt(strArr.length)); byte[] original = builder.toString().getBytes("UTF-8"); byte[] encrypted = aes128CBCEncrypt(original, key, initVector); byte[] decrypted = aes128CBCDecrypt(encrypted, key, initVector); if (equal(original, decrypted)) { count++; } else { System.out.println("字符串加解密后內容不一致"); System.out.println("原始字符串： " + Arrays.toString(encrypted)); System.out.println("解密字符串： " + Arrays.toString(decrypted)); } } if (total == count) { System.out.println("測試全部通過"); } else { System.out.println("加解密出現缺陷數據"); } System.out.println("運行總次數是： " + run);*/ String result= aesCBCDecrypt("cArgNYmA0cCFwKRV7B5FBvrKBSW4G8M+Qi/xqO0GDP4=","utf-8","69a183bbca2d9a01914d2dfa34455742","69a183bbca2d9a01"); System.out.println("result"+result); } }