AES加密解密Android版

package cn.com.smartpay.app.http;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 carlos [e-mail] * @version 创建时间：2012-5-17 上午9:48:35 类说明 */public class AESUtils {    public static final String TAG = "AESUtils";    public static String encrypt(String seed, String clearText) {        // Log.d(TAG, "加密前的seed=" + seed + ",内容为:" + clearText);        byte[] result = null;        try {            byte[] rawkey = getRawKey(seed.getBytes());            result = encrypt(rawkey, clearText.getBytes());        } catch (Exception e) {            e.printStackTrace();        }        String content = toHex(result);        // Log.d(TAG, "加密后的内容为:" + content);        return content;    }    public static String decrypt(String seed, String encrypted) {        // Log.d(TAG, "解密前的seed=" + seed + ",内容为:" + encrypted);        byte[] rawKey;        try {            rawKey = getRawKey(seed.getBytes());            byte[] enc = toByte(encrypted);            byte[] result = decrypt(rawKey, enc);            String coentn = new String(result);            // Log.d(TAG, "解密后的内容为:" + coentn);            return coentn;        } catch (Exception e) {            e.printStackTrace();            return null;        }    }    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);        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 cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");        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 cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");        cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(                new byte[cipher.getBlockSize()]));        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 static void appendHex(StringBuffer sb, byte b) {        final String HEX = "0123456789ABCDEF";        sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));    }
}
原文http://www.cnblogs.com/carlosk/archive/2012/05/18/2507975.html