Aes,des encryption and decryption on Android platform

when using Java for AES encryption, the following methods are used:securerandom sr = securerandom.getinstance ("sha1prng");
However, in the android4.2 above encryption, decryption, will be reported similar to the badpadding exception, but the code to replace the method is all OK. securerandom sr = securerandom.getinstance ("sha1prng", "Crypto");
AES Encryption algorithm:

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 ()); b yte[] 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 (+, SR); 192 and 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 (RA W, "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), +). 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";p rivate static void Appendhex (StringBuffer sb, byte b) {Sb.append (HE X.charat ((b>>4) &0x0f)). Append (Hex.charat (b&0x0f));}}

DES encryption algorithm

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 encryption * * @author Houjinyun * */public class Desutils {private static final Stri ng KEY = "********************";/** * DES3 Encryption of Strings * * @param str * @return encrypted string, null */public static string if failed enc Ode (String str) {try {byte[] key = Key.getbytes ("UTF-8"); byte[] data = str.getbytes ("UTF-8"); byte[] Encodeddata = Des3enco DEECB (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 encryption, do not IV * * @param key * key * @param data * plaintext * @return Base64 encoded ciphertext * @throws Exception */PU Blic static byte[] DES3ENCODEECB (byte[] key, byte[] data) throws Exception {key Deskey = Null;desedekeyspec Spec = new Dese Dekeyspec (key); Secretkeyfactory keyfactory = secretkeyfactory.getinstance ("Desede");d Eskey = Keyfactory.generatesecret (spec); Cipher Cipher = cipher.getinstance ("Desede" + "/ecb/pkcs5padding"); Cipher.init (Cipher.encrypt_mode, Deskey); byte[] BOut = cipher.dofinal (data); return bOut;} /** * ECB decryption, do not IV * * @param key * key * @param data * Base64 encoded ciphertext * @return plaintext * @throws Exception * /public Static byte[] EES3DECODEECB (byte[] key, byte[] data) throws Exception {key Deskey = Null;desedekeyspec Spec = new D Esedekeyspec (key); Secretkeyfactory keyfactory = secretkeyfactory.getinstance ("Desede");d Eskey = Keyfactory.generatesecret (spec); Cipher Cipher = cipher.getinstance ("Desede" + "/ecb/pkcs5padding"); Cipher.init (Cipher.decrypt_mode, deskey); byte[] BOut = cipher.dofinal (data); return bOut;} /** * CBC Encryption * * @param key * key * @param keyiv * IV * @param data * Clear text * @return Base64 Code ciphertext * @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");d Eskey = 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 Decryption * * @param key * key * @param keyiv * IV * @param data * Base64 encoded ciphertext * @retur N PlainText * @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");d Eskey = 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 DE Sedekeyspec (key); Secretkeyfactory keyfactory = secretkeyfactory.getinstance ("Desede");d Eskey = 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;}}}

Aes,des encryption and decryption on Android platform