編輯:關於Android編程
import android.annotation.SuppressLint; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; /** * * * Author:sunger */ public class AESUtils { 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); } @SuppressLint("TrulyRandom") private static byte[] getRawKey(byte[] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto"); 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, new IvParameterSpec( new byte[cipher.getBlockSize()])); 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, new IvParameterSpec( new byte[cipher.getBlockSize()])); 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 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)); } }
轉載請注明出處,謝謝~~目錄本文概述 動畫補充說明 屬性動畫的View加載方式 TypeEvaluator的使用 TimeInterpolator LayoutTrans
我想大家可能都有過這樣的經歷:兜裡揣著一張銀行卡,在街上到處找自動取款機(ATM)。在這個場景中,ATM就是的興趣點,我們想做的事情就是找到離自己較近的一些ATM然後取款
1.什麼是Activity?Activity是用戶接口程序,它是Android應用程序的基本功能單元,它的主要功能是提供界面。Activity是Android的核心類,該
1、頁面初始化在app開發中,若要使用HTML5+擴展api,必須等plusready事件發生後才能正常使用,mui將該事件封裝成了mui.plusReady()方法,涉