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Add pbkdf2 support and exceptions in kotlin

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This commit is contained in:
Hugo Pointcheval 2020-04-18 16:30:41 +02:00
parent dee2e415c2
commit cf78f70131
1 changed files with 38 additions and 11 deletions
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49
android/src/main/kotlin/fr/pointcheval/native_crypto/NativeCryptoPlugin.kt
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@ -2,7 +2,6 @@
* Copyright (c) 2020
* Author: Hugo Pointcheval
*/
package fr.pointcheval.native_crypto
import androidx.annotation.NonNull
@ -17,7 +16,9 @@ import java.security.SecureRandom
import javax.crypto.Cipher
import javax.crypto.KeyGenerator
import javax.crypto.SecretKey
import javax.crypto.SecretKeyFactory
import javax.crypto.spec.IvParameterSpec
import javax.crypto.spec.PBEKeySpec
import javax.crypto.spec.SecretKeySpec
@ -42,8 +43,21 @@ public class NativeCryptoPlugin : FlutterPlugin, MethodCallHandler {
}
override fun onMethodCall(@NonNull call: MethodCall, @NonNull result: Result) {
if (call.method == "symKeygen") {
if (call.method == "pbkdf2") {
val password = call.argument<String>("password")
val salt = call.argument<String>("salt")
val keyLength = call.argument<Int>("keyLength")
val iteration = call.argument<Int>("iteration")
val key = pbkdf2(password!!, salt!!, keyLength!!, iteration!!)
if (key.isNotEmpty()) {
result.success(key)
} else {
result.error("PBKDF2ERROR", "PBKDF2 KEY IS NULL.", null)
}
} else if (call.method == "symKeygen") {
val keySize = call.argument<Int>("size") // 128, 192, 256
val aesKey = symKeygen(keySize!!) // Collection<ByteArray>
@ -51,7 +65,7 @@ public class NativeCryptoPlugin : FlutterPlugin, MethodCallHandler {
if (aesKey.isNotEmpty()) {
result.success(aesKey)
} else {
result.error("KeygenError", "Key generation failed.", null)
result.error("SYMKEYGENERROR", "GENERATED KEY IS NULL.", null)
}
} else if (call.method == "symEncrypt") {
val payload = call.argument<ByteArray>("payload") // ByteArray
@ -62,19 +76,24 @@ public class NativeCryptoPlugin : FlutterPlugin, MethodCallHandler {
if (encryptedPayload.isNotEmpty()) {
result.success(encryptedPayload)
} else {
result.error("EncryptionError", "Encryption failed.", null)
result.error("ENCRYPTIONERROR", "ENCRYPTED PAYLOAD IS NULL.", null)
}
} else if (call.method == "symDecrypt") {
val payload = call.argument<Collection<ByteArray>>("payload") // Collection<ByteArray>
val aesKey = call.argument<ByteArray>("aesKey") // ByteArray
var decryptedPayload : ByteArray? = null
val decryptedPayload = symDecrypt(payload!!, aesKey!!) // ByteArray
if (decryptedPayload != null && decryptedPayload.isNotEmpty()) {
result.success(decryptedPayload)
} else {
result.error("DecryptionError", "Decryption failed.", null)
try {
decryptedPayload = symDecrypt(payload!!, aesKey!!)
if (decryptedPayload != null && decryptedPayload.isNotEmpty()) {
result.success(decryptedPayload)
} else {
result.error("DECRYPTIONERROR", "DECRYPTED PAYLOAD IS NULL. MAYBE VERIFICATION MAC IS UNVALID.", null)
}
} catch (e : Exception) {
result.error("DECRYPTIONERROR", "AN ERROR OCCURED WHILE DECRYPTING.", null)
}
} else {
result.notImplemented()
}
@ -90,6 +109,15 @@ public class NativeCryptoPlugin : FlutterPlugin, MethodCallHandler {
return md.digest(obj)
}
private fun pbkdf2(password : String, salt : String, keyLength : Int, iteration : Int) : ByteArray {
val chars: CharArray = password.toCharArray()
val spec = PBEKeySpec(chars, salt.toByteArray(), iteration, keyLength * 8)
val skf: SecretKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256")
return skf.generateSecret(spec).encoded
}
private fun symKeygen(keySize : Int): ByteArray {
val SYM_CRYPTO_BITS = keySize
@ -102,7 +130,6 @@ public class NativeCryptoPlugin : FlutterPlugin, MethodCallHandler {
return skey!!.encoded
}
private fun symEncrypt(payload: ByteArray, aesKey: ByteArray): Collection<ByteArray> {
val mac = digest(aesKey + payload)