From 5545badfc578f89dfe0e5b9a6ca389ecfdbb37e2 Mon Sep 17 00:00:00 2001
From: Pointcheval Hugo <hugo@gitlab.pointcheval.fr>
Date: Sat, 19 Dec 2020 21:45:03 +0100
Subject: [PATCH] Add keyderivation with pbkdf2 in swift

---
 ios/Classes/KeyDerivation.swift | 40 +++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 ios/Classes/KeyDerivation.swift

diff --git a/ios/Classes/KeyDerivation.swift b/ios/Classes/KeyDerivation.swift
new file mode 100644
index 0000000..b1a5954
--- /dev/null
+++ b/ios/Classes/KeyDerivation.swift
@@ -0,0 +1,40 @@
+//
+//  KeyDerivation.swift
+//
+//  NativeCryptoPlugin
+//
+//  Copyright (c) 2020
+//  Author: Hugo Pointcheval
+//
+
+import Foundation
+import CommonCrypto
+
+class KeyDerivation {
+    func pbkdf2(password: String, salt: String, keyLength: Int, iteration: Int, algorithm: HashAlgorithm) -> Data? {
+        
+        let passwordData = password.data(using: .utf8)!
+        let saltData = salt.data(using: .utf8)!
+        
+        var derivedKeyData = Data(repeating: 0, count: keyLength)
+        var localDerivedKeyData = derivedKeyData
+            
+        let derivationStatus = derivedKeyData.withUnsafeMutableBytes { derivedKeyBytes in
+            saltData.withUnsafeBytes { saltBytes in
+                CCKeyDerivationPBKDF(
+                    CCPBKDFAlgorithm(kCCPBKDF2),
+                    password, passwordData.count,
+                    saltBytes, saltData.count,
+                    algorithm.pbkdf2,
+                    UInt32(iteration),
+                    derivedKeyBytes, localDerivedKeyData.count)
+            }
+        }
+        if (derivationStatus != kCCSuccess) {
+            print("Error: \(derivationStatus)")
+            return nil;
+        }
+        
+        return derivedKeyData
+    }
+}