I am trying to encrypt in android and decrypt in ios.I am using AES.GCM encryption however when i try to decrypt the package in ios i get Aunthetication faliure message.Below is the code for ios decryption
func decryptData(decryptToData:Data,key:SymmetricKey)->String {
let combinedData = decryptToData // Previous sealed bo
let sealedBoxToOpen = try! AES.GCM.SealedBox(combined: decryptToData)
if let decryptedData = try? AES.GCM.open(sealedBoxToOpen, using: key) {
decryptedString = String(data: decryptedData, encoding: .utf8)!
print(decryptedString ?? "Failed")
} else {
print(CryptoKitError) // Ouch, doSomething() threw an error.
}
}
This is similar to iOS CryptoKit in Java but i am doing the other way around.
This is the android encryption code
public synchronized Map<String, String> encrypt(byte[] rawKey, byte[] rawData, @Nullable byte[] associatedData) throws StashDataEncryptionException {
byte[] rawEncryptionKey = null;
if (rawKey == null) {
SecureRandom secureRandom = new SecureRandom();
byte[] key = new byte[KEY_LENGTH_BYTE];
secureRandom.nextBytes(key);
rawEncryptionKey = key;
} else {
rawEncryptionKey = rawKey;
}
byte[] iv = null;
byte[] encrypted = null;
try {
iv = new byte[IV_LENGTH_BYTE];
secureRandom.nextBytes(iv);
final Cipher cipherEnc = getCipher();
cipherEnc.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(rawEncryptionKey, "AES"), new GCMParameterSpec(TAG_LENGTH_BIT, iv));
if (associatedData != null) {
cipherEnc.updateAAD(associatedData);
}
encrypted = cipherEnc.doFinal(rawData);
String base64Key = Base64.encodeToString(rawEncryptionKey, Base64.DEFAULT);
//concat all of it to a single message
ByteBuffer byteBuffer = ByteBuffer.allocate(1 + iv.length + encrypted.length);
byteBuffer.put((byte) iv.length);
byteBuffer.put(iv);
byteBuffer.put(encrypted);
byte[] cipherMessage = byteBuffer.array();
Map map = new HashMap<String, String>();
map.put(MAP_KEY, base64Key);
map.put(MAP_Byte_CONTENT, cipherMessage);
return map;
} catch (Exception e) {
throw new StashDataEncryptionException("could not encrypt data", e);
}
}
i checked the key,iv and tag lenght.Its same on the ios side as android
