Many people android using the above AES show Javax.crypto.BadPaddingException:pad block corrupted The following code released no problem, compare yourself. No explanation!
public static Class cryptogram{
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", "Crypto");
Sr.setseed (seed);
Kgen.init (+, SR); 192 and 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,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.init (Cipher.decrypt_mode, Skeyspec,new ivparameterspec (New Byte[cipher.getblocksize ()));
byte[] decrypted = cipher.dofinal (encrypted);
return decrypted;
}
private static string Tohex (String txt) {
Return Tohex (Txt.getbytes ());
}
private static string Fromhex (String hex) {
return new String (ToByte (hex));
}
private 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;
}
private 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));
}
}
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About Android AES part of the machine described Javax.crypto.BadPaddingException:pad block corrupted
