Android加密算法之AES加密和解密实现 _AES加密

【Android加密算法之AES加密和解密实现】天下之事常成于困约，而败于奢靡。这篇文章主要讲述Android加密算法之AES加密和解密实现相关的知识，希望能为你提供帮助。

< pre name="code" class="plain"> < span style="font-family:Microsoft YaHei; font-size:18px; "> 前面写了经常使用了MD5加密算法。一个肯定不能满足本屌丝的胃口，近期发现AES加密算法貌似挺牛逼的样子。还是是美国联邦政府採用的一种区块高级加密标准。一看到“高级”就把我吓尿了，果然牛逼，废话少说，先学会用再说。
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/** * @param * @return AES加密算法加密 * @throws Exception */ public static String encrypt(String seed, String cleartext) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] result = encrypt(rawKey, cleartext.getBytes()); return toHex(result); } /** * @param * @return AES加密算法加密 * @throws Exception */ private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted = cipher.doFinal(clear); return encrypted; } private static String toHex(byte[] buf) { final String HEX = "0123456789ABCDEF"; if (buf == null) return ""; StringBuffer result = new StringBuffer(2 * buf.length); for (int i = 0; i < buf.length; i++) { result.append(HEX.charAt((buf[i] > > 4) & 0x0f)).append( HEX.charAt(buf[i] & 0x0f)); } return result.toString(); } /** * @param raw * @param encrypted * @return AES加密算法解密 * @throws Exception */ public static String decrypt(String seed, String encrypted) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] enc = toByte(encrypted); byte[] result = decrypt(rawKey, enc); return new String(result); } private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] decrypted = cipher.doFinal(encrypted); return decrypted; } private static byte[] toByte(String hexString) { int len = hexString.length() / 2; byte[] result = new byte[len]; for (int i = 0; i < len; i++) result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue(); return result; } private static byte[] getRawKey(byte[] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.setSeed(seed); kgen.init(128, sr); // 192 and 256 bits may not be available SecretKey skey = kgen.generateKey(); byte[] raw = skey.getEncoded(); return raw; }

測试代码：

< span style="font-family:Courier New; font-size:18px; "> String masterPassword = "test"; String originalText = "0123456789"; String encryptingCode = SimpleCrypto.encrypt(masterPassword,originalText); Log.i("加密结果为 ",encryptingCode); String decryptingCode = SimpleCrypto.decrypt(masterPassword, encryptingCode); Log.i("解密结果",decryptingCode); < /span>

PS：AES属于对称加密方法，可破解有木有!