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How can I decrypt AES-encrypted data in Java and Scala, given that the data was encrypted in Golang with a 128-bit key?
How can I decrypt AES-encrypted data in Java and Scala, given that the data was encrypted in Golang with a 128-bit key?
AES Encryption in Golang and Decryption in Java
The Golang code provided encrypts data using the AES algorithm with a 128-bit key. To decrypt this data, we can use a similar Java decoder to ensure compatibility between the two languages.
Java Decoder
<code class="java">String decode(String base64Text, byte[] key) throws InvalidAlgorithmParameterException,NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
byte[] inputArr = Base64.getUrlDecoder().decode(base64Text);
SecretKeySpec skSpec = new SecretKeySpec(key, "AES");
Cipher cipher = Cipher.getInstance("AES/CFB/NoPadding");
int blockSize = cipher.getBlockSize();
IvParameterSpec iv = new IvParameterSpec(Arrays.copyOf(inputArr, blockSize));
byte[] dataToDecrypt = Arrays.copyOfRange(inputArr, blockSize, inputArr.length);
cipher.init(Cipher.DECRYPT_MODE, skSpec, iv);
byte[] result = cipher.doFinal(dataToDecrypt);
return new String(result, StandardCharsets.UTF_8);
}</code>
Scala Decoder
<code class="scala">def decode(input:String, key:String) = {
val cipher = Cipher.getInstance("AES/CFB/NoPadding")
val blockSize = cipher.getBlockSize()
val keyBytes = key.getBytes()
val inputArr = Base64.getUrlDecoder().decode(input)
val skSpec = new SecretKeySpec(keyBytes, "AES")
val iv = new IvParameterSpec(inputArr.slice(0, blockSize).toArray)
val dataToDecrypt = inputArr.slice(blockSize, inputArr.size)
cipher.init(Cipher.DECRYPT_MODE, skSpec, iv)
new String(cipher.doFinal(dataToDecrypt.toArray))
}</code>
Usage
To decrypt the encrypted text, use the provided Java or Scala decoder. For instance, if the encrypted text is "c1bpFhxn74yzHQs-vgLcW6E5yL8zJfgceEQgYl0=" and the key is "0123456789abcdef", the decrypted text would be "test text 123".
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