package com.test; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import java.security.SecureRandom; public class AES { public static byte[] encrypt(String content, String keyWord) { try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG"); secureRandom.setSeed(keyWord.getBytes()); kgen.init(128, secureRandom); SecretKey secretKey = kgen.generateKey(); byte[] enCodeFormat = secretKey.getEncoded(); SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); Cipher cipher = Cipher.getInstance("AES"); byte[] byteContent = content.getBytes("utf-8"); cipher.init(Cipher.ENCRYPT_MODE, key); byte[] result = cipher.doFinal(byteContent); return result; } catch (Exception e) { e.printStackTrace(); } return null; } public static String encrypt2Str(String content, String password) { return parseByte2HexStr(encrypt(content, password)); } public static byte[] decrypt(byte[] content, String keyWord) { try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG"); secureRandom.setSeed(keyWord.getBytes()); kgen.init(128, secureRandom); SecretKey secretKey = kgen.generateKey(); byte[] enCodeFormat = secretKey.getEncoded(); SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, key); byte[] result = cipher.doFinal(content); return result; } catch (Exception e) { e.printStackTrace(); } return null; } public static byte[] decrypt(String content, String keyWord) { return decrypt(parseHexStr2Byte(content), keyWord); } 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(); } 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; } public static void main(String[] args) { String content = "一二四五"; String key = "123"; System.out.println("加密前:" + content); String encryptResult = encrypt2Str(content, key); System.out.println("加密后:" + encryptResult); byte[] decryptResult = decrypt(encryptResult, key); System.out.println("解密后:" + new String(decryptResult)); } } Previous Next ponxu / 2013-12-31 Categories Java Tags Java