Android通过AES128加密解密字符串，androidaes128,Android通过AES

Android通过AES128加密解密字符串，androidaes128,Android通过AES

Android通过AES128加密解密字符串

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) * &amp;lt;/pre&amp;gt; * @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 &amp;lt; 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 &amp;lt; 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&amp;gt;&amp;gt;4)&amp;amp;0x0f)).append(HEX.charAt(b&amp;amp;0x0f));    }}