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