android平台上AES,DES加解密及问题

在使用java进行AES加密的时候，会用到如下方法：

SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");

但是在android4.2以上进行加密、解密时，会报类似badPadding的异常，但是把该代码替换成一下方法则一切都OK。

SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto"); 

AES加密算法：

import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;public class AESUtil {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");SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto"); sr.setSeed(seed);kgen.init(128, sr); // 192 and 256 bits may not be availableSecretKey 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));}}

DES加密算法

import java.io.UnsupportedEncodingException;import java.security.Key;import java.util.Locale;import javax.crypto.Cipher;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESedeKeySpec;import javax.crypto.spec.IvParameterSpec;/** * DES加密 *  * @author houjinyun *  */public class DesUtils {private static final String KEY = "********************";/** * 对字符串进行DES3加密 *  * @param str * @return 加密后的字符串，若失败则返回null */public static String encode(String str) {try {byte[] key = KEY.getBytes("UTF-8");byte[] data = str.getBytes("UTF-8");byte[] encodedData = des3EncodeECB(key, data);return byte2HexString(encodedData);} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}return null;}public static String decode(String str) {try {byte[] key = KEY.getBytes("UTF-8");byte[] data = hexString2Byte(str);byte[] decodedData = des3DecodeECB(key, data);return new String(decodedData, "UTF-8");} catch(Exception e) {e.printStackTrace();}return null;}/** * ECB加密,不要IV *  * @param key *            密钥 * @param data *            明文 * @return Base64编码的密文 * @throws Exception */public static byte[] des3EncodeECB(byte[] key, byte[] data)throws Exception {Key deskey = null;DESedeKeySpec spec = new DESedeKeySpec(key);SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");deskey = keyfactory.generateSecret(spec);Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");cipher.init(Cipher.ENCRYPT_MODE, deskey);byte[] bOut = cipher.doFinal(data);return bOut;}/** * ECB解密,不要IV *  * @param key *            密钥 * @param data *            Base64编码的密文 * @return 明文 * @throws Exception */public static byte[] ees3DecodeECB(byte[] key, byte[] data)throws Exception {Key deskey = null;DESedeKeySpec spec = new DESedeKeySpec(key);SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");deskey = keyfactory.generateSecret(spec);Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");cipher.init(Cipher.DECRYPT_MODE, deskey);byte[] bOut = cipher.doFinal(data);return bOut;}/** * CBC加密 *  * @param key *            密钥 * @param keyiv *            IV * @param data *            明文 * @return Base64编码的密文 * @throws Exception */public static byte[] des3EncodeCBC(byte[] key, byte[] keyiv, byte[] data)throws Exception {Key deskey = null;DESedeKeySpec spec = new DESedeKeySpec(key);SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");deskey = keyfactory.generateSecret(spec);Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");IvParameterSpec ips = new IvParameterSpec(keyiv);cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);byte[] bOut = cipher.doFinal(data);return bOut;}/** * CBC解密 *  * @param key *            密钥 * @param keyiv *            IV * @param data *            Base64编码的密文 * @return 明文 * @throws Exception */public static byte[] des3DecodeCBC(byte[] key, byte[] keyiv, byte[] data)throws Exception {Key deskey = null;DESedeKeySpec spec = new DESedeKeySpec(key);SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");deskey = keyfactory.generateSecret(spec);Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");IvParameterSpec ips = new IvParameterSpec(keyiv);cipher.init(Cipher.DECRYPT_MODE, deskey, ips);byte[] bOut = cipher.doFinal(data);return bOut;}public static byte[] des3DecodeECB(byte[] key, byte[] data)throws Exception {Key deskey = null;DESedeKeySpec spec = new DESedeKeySpec(key);SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");deskey = keyfactory.generateSecret(spec);Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");cipher.init(Cipher.DECRYPT_MODE, deskey);byte[] bOut = cipher.doFinal(data);return bOut;}private static String byte2HexString(byte[] b) {String a = "";for (int i = 0; i < b.length; i++) {String hex = Integer.toHexString(b[i] & 0xFF).toUpperCase(Locale.US);if (hex.length() == 1) {hex = '0' + hex;}a = a + hex;}return a;}private static byte[] hexString2Byte(String str) {if (str == null)return null;str = str.trim();int len = str.length();if (len == 0 || len % 2 == 1)return null;byte[] b = new byte[len / 2];try {for (int i = 0; i < str.length(); i += 2) {b[i / 2] = (byte) Integer.decode("0x" + str.substring(i, i + 2)).intValue();}return b;} catch (Exception e) {return null;}}}