Android通过AES128加密解密字符串
发布时间:2020-05-28 20:39:54 所属栏目:Java 来源:互联网
导读:Android通过AES128加密解密字符串
下面是脚本之家 jb51.cc 通过网络收集整理的代码片段。 脚本之家小编现在分享给大家,也给大家做个参考。 import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; /** download from http://www.open-open.com/code * Usage: * <pre> * String crypto = SimpleCrypto.encrypt(masterpassword,cleartext) * ... * String cleartext = SimpleCrypto.decrypt(masterpassword,crypto) * </pre> * @author ferenc.hechler */ public class SimpleCrypto { public static String encrypt(String seed,String cleartext) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] result = encrypt(rawKey,cleartext.getBytes()); return toHex(result); } 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[] 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; } 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 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; } public static String toHex(String txt) { return toHex(txt.getBytes()); } public static String fromHex(String hex) { return new String(toByte(hex)); } public 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; } public static String toHex(byte[] buf) { if (buf == null) return ""; StringBuffer result = new StringBuffer(2*buf.length); for (int i = 0; i < buf.length; i++) { appendHex(result,buf[i]); } return result.toString(); } private final static String HEX = "0123456789ABCDEF"; private static void appendHex(StringBuffer sb,byte b) { sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f)); } } 以上是脚本之家(jb51.cc)为你收集整理的全部代码内容,希望文章能够帮你解决所遇到的程序开发问题。 如果觉得脚本之家网站内容还不错,欢迎将脚本之家网站推荐给程序员好友。 (编辑:安卓应用网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |