我已经使用AES进行了加密，但我无法进行解密Iam gettin javax.crypto.IllegalBlockSizeException: last block incomplete in decryption .....我无法找出问题所在。我很感激任何帮助。
try {
in = new FileInputStream("/sdcard/Pic 1.txt");
} catch (FileNotFoundException e) {
e.printStackTrace();
}
File f=new File("/sdcard/Pic 1.txt");
buf = new byte[(int) f.length()+2];
try {
in.read(buf);
} catch (IOException e) {
e.printStackTrace();
}
try {
decryptedData = decrypt(key, buf);
decryptedimage = BitmapFactory.decodeByteArray(
decryptedData, 0, decryptedData.length);
loadedimage.setImageBitmap(decryptedimage);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public void Encription(Bitmap bm) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos);
b = baos.toByteArray();
try {
keyStart = ".....".getBytes();
kgen = KeyGenerator.getInstance("AES");
sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(keyStart);
kgen.init(128, sr); // 192 and 256 bits may not be available
skey = kgen.generateKey();
key = skey.getEncoded();
encryptedData = encrypt(key, b);
encryptedimage = BitmapFactory.decodeByteArray(encryptedData, 0,
encryptedData.length);
out = new FileOutputStream("/sdcard/"+"Pic "+i+".txt");
out.write(encryptedData, 0, encryptedData.length);
out.close();
} catch (Exception e) {
}
i++;
}
private 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 byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
long start=System.currentTimeMillis()/1000l;
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
02-19 08:27:06.972: W/System.err(12742): javax.crypto.IllegalBlockSizeException: last block incomplete in decryption