KeePassLib.Cryptography.KeyDerivation.AesKdf.TransformKey C# (CSharp) Method

		private static byte[] TransformKey(byte[] pbOriginalKey32, byte[] pbKeySeed32,
			ulong uNumRounds)
		{
			Debug.Assert((pbOriginalKey32 != null) && (pbOriginalKey32.Length == 32));
			if(pbOriginalKey32 == null) throw new ArgumentNullException("pbOriginalKey32");
			if(pbOriginalKey32.Length != 32) throw new ArgumentException();

			Debug.Assert((pbKeySeed32 != null) && (pbKeySeed32.Length == 32));
			if(pbKeySeed32 == null) throw new ArgumentNullException("pbKeySeed32");
			if(pbKeySeed32.Length != 32) throw new ArgumentException();

			byte[] pbNewKey = new byte[32];
			Array.Copy(pbOriginalKey32, pbNewKey, pbNewKey.Length);

			try
			{
				if(NativeLib.TransformKey256(pbNewKey, pbKeySeed32, uNumRounds))
					return CryptoUtil.HashSha256(pbNewKey);

				if(TransformKeyGCrypt(pbNewKey, pbKeySeed32, uNumRounds))
					return CryptoUtil.HashSha256(pbNewKey);

				if(TransformKeyManaged(pbNewKey, pbKeySeed32, uNumRounds))
					return CryptoUtil.HashSha256(pbNewKey);
			}
			finally { MemUtil.ZeroByteArray(pbNewKey); }

			return null;
		}