init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Digests/Sha3Digest.cs

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+using System;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Digests;
+
+public class Sha3Digest : KeccakDigest
+{
+	public override string AlgorithmName => "SHA3-" + fixedOutputLength;
+
+	private static int CheckBitLength(int bitLength)
+	{
+		switch (bitLength)
+		{
+		case 224:
+		case 256:
+		case 384:
+		case 512:
+			return bitLength;
+		default:
+			throw new ArgumentException(bitLength + " not supported for SHA-3", "bitLength");
+		}
+	}
+
+	public Sha3Digest()
+		: this(256)
+	{
+	}
+
+	public Sha3Digest(int bitLength)
+		: base(CheckBitLength(bitLength))
+	{
+	}
+
+	public Sha3Digest(Sha3Digest source)
+		: base(source)
+	{
+	}
+
+	public override int DoFinal(byte[] output, int outOff)
+	{
+		AbsorbBits(2, 2);
+		return base.DoFinal(output, outOff);
+	}
+
+	protected override int DoFinal(byte[] output, int outOff, byte partialByte, int partialBits)
+	{
+		if (partialBits < 0 || partialBits > 7)
+		{
+			throw new ArgumentException("must be in the range [0,7]", "partialBits");
+		}
+		int num = (partialByte & ((1 << partialBits) - 1)) | (2 << partialBits);
+		int num2 = partialBits + 2;
+		if (num2 >= 8)
+		{
+			Absorb(new byte[1] { (byte)num }, 0, 1);
+			num2 -= 8;
+			num >>= 8;
+		}
+		return base.DoFinal(output, outOff, (byte)num, num2);
+	}
+
+	public override IMemoable Copy()
+	{
+		return new Sha3Digest(this);
+	}
+}