Dese-ECB-Verschlüsselungsdecke ⇐ Java

[Anonymous]

Ich versuche, eine Zeichenfolge in Java mit dem folgenden Code zu verschlüsseln und zu entschlüsseln: < /p>

Code: Select all

public byte[] encrypt(String message) throws Exception {
final MessageDigest md = MessageDigest.getInstance("md5");
final byte[] digestOfPassword = md.digest("MYKEY12345"
.getBytes("utf-8"));
final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
for (int j = 0, k = 16; j < 8;) {
keyBytes[k++] = keyBytes[j++];
}

final SecretKey key = new SecretKeySpec(keyBytes, "DESede");
//        final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
final Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);

final byte[] plainTextBytes = message.getBytes("utf-8");
final byte[] cipherText = cipher.doFinal(plainTextBytes);
// final String encodedCipherText = new sun.misc.BASE64Encoder()
// .encode(cipherText);

Log.d("base64", Base64.getEncoder().encodeToString(cipherText));

return cipherText;
}

public String decrypt(byte[] message) throws Exception {
final MessageDigest md = MessageDigest.getInstance("md5");
final byte[] digestOfPassword = md.digest("MYKEY12345"
.getBytes("utf-8"));
final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
for (int j = 0, k = 16; j < 8;) {
keyBytes[k++] = keyBytes[j++];
}

final SecretKey key = new SecretKeySpec(keyBytes, "DESede");
//    final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
final Cipher decipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
decipher.init(Cipher.DECRYPT_MODE, key);

// final byte[] encData = new
// sun.misc.BASE64Decoder().decodeBuffer(message);
final byte[] plainText = decipher.doFinal(message);

return new String(plainText, "UTF-8");
}
< /code>
Verwendung: < /p>
byte[] codedtext = new Common().encrypt("HELLOWORLD!"); // Function to get the Encrption
< /code>
Ausgabe: < /p>
 base64: Ya9zBTukyOmdOh5/5vCaGA== // encrypted string converted to base64
Encrypted : [B@d41c149
< /code>
todecrypt: < /p>
 String decodedtext = new Common().decrypt(codedtext); // To decrypt String
< /code>
Ausgabe: < /p>
Decrypted : HELLOWORLD!  // from Encrypted string

Wenn ich nun denselben Schlüssel und String verwende, um den Verschlüsselungsschlüssel online zu erhalten, erhalte ich verschiedene Werte.>