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：

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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 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));     } }

DES加密算法

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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;         }     }       }

 

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