ios core lib

src/iOS.Core/Services/CryptoPrimitiveService.cs

@@ -0,0 +1,47 @@
+using Bit.Core.Abstractions;
+using Bit.Core.Enums;
+using Foundation;
+using System;
+using System.Runtime.InteropServices;
+
+namespace Bit.iOS.Core.Services
+{
+    public class CryptoPrimitiveService : ICryptoPrimitiveService
+    {
+        private const uint PBKDFAlgorithm = 2; // kCCPBKDF2
+
+        public byte[] Pbkdf2(byte[] password, byte[] salt, CryptoHashAlgorithm algorithm, int iterations)
+        {
+            uint keySize = 32;
+            uint pseudoRandomAlgorithm = 3; // kCCPRFHmacAlgSHA256
+            if(algorithm == CryptoHashAlgorithm.Sha512)
+            {
+                keySize = 64;
+                pseudoRandomAlgorithm = 5; // kCCPRFHmacAlgSHA512
+            }
+            else if(algorithm != CryptoHashAlgorithm.Sha256)
+            {
+                throw new ArgumentException("Unsupported PBKDF2 algorithm.");
+            }
+
+            var keyData = new NSMutableData();
+            keyData.Length = keySize;
+
+            var passwordData = NSData.FromArray(password);
+            var saltData = NSData.FromArray(salt);
+
+            var result = CCKeyCerivationPBKDF(PBKDFAlgorithm, passwordData.Bytes, passwordData.Length, saltData.Bytes,
+                saltData.Length, pseudoRandomAlgorithm, Convert.ToUInt32(iterations), keyData.MutableBytes,
+                keyData.Length);
+
+            byte[] keyBytes = new byte[keyData.Length];
+            Marshal.Copy(keyData.Bytes, keyBytes, 0, Convert.ToInt32(keyData.Length));
+            return keyBytes;
+        }
+
+        // ref: http://opensource.apple.com/source/CommonCrypto/CommonCrypto-55010/CommonCrypto/CommonKeyDerivation.h
+        [DllImport(ObjCRuntime.Constants.libSystemLibrary, EntryPoint = "CCKeyDerivationPBKDF")]
+        private extern static int CCKeyCerivationPBKDF(uint algorithm, IntPtr password, nuint passwordLen,
+            IntPtr salt, nuint saltLen, uint prf, nuint rounds, IntPtr derivedKey, nuint derivedKeyLength);
+    }
+}