119 lines
3.9 KiB
C#
119 lines
3.9 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using System.IO;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Math.EC.Rfc7748;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Security;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.IO;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters
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{
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public sealed class X25519PrivateKeyParameters
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: AsymmetricKeyParameter
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{
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public static readonly int KeySize = X25519.ScalarSize;
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public static readonly int SecretSize = X25519.PointSize;
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private readonly byte[] data = new byte[KeySize];
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public X25519PrivateKeyParameters(SecureRandom random)
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: base(true)
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{
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X25519.GeneratePrivateKey(random, data);
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}
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public X25519PrivateKeyParameters(byte[] buf)
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: this(Validate(buf), 0)
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{
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}
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public X25519PrivateKeyParameters(byte[] buf, int off)
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: base(true)
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{
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Array.Copy(buf, off, data, 0, KeySize);
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}
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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public X25519PrivateKeyParameters(ReadOnlySpan<byte> buf)
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: base(true)
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{
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if (buf.Length != KeySize)
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throw new ArgumentException("must have length " + KeySize, nameof(buf));
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buf.CopyTo(data);
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}
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#endif
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public X25519PrivateKeyParameters(Stream input)
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: base(true)
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{
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if (KeySize != Streams.ReadFully(input, data))
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throw new EndOfStreamException("EOF encountered in middle of X25519 private key");
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}
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public void Encode(byte[] buf, int off)
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{
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Array.Copy(data, 0, buf, off, KeySize);
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}
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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public void Encode(Span<byte> buf)
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{
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data.CopyTo(buf);
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}
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#endif
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public byte[] GetEncoded()
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{
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return Arrays.Clone(data);
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}
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public X25519PublicKeyParameters GeneratePublicKey()
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{
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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Span<byte> publicKey = stackalloc byte[X25519.PointSize];
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X25519.GeneratePublicKey(data, publicKey);
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return new X25519PublicKeyParameters(publicKey);
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#else
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byte[] publicKey = new byte[X25519.PointSize];
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X25519.GeneratePublicKey(data, 0, publicKey, 0);
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return new X25519PublicKeyParameters(publicKey, 0);
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#endif
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}
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public void GenerateSecret(X25519PublicKeyParameters publicKey, byte[] buf, int off)
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{
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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GenerateSecret(publicKey, buf.AsSpan(off));
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#else
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byte[] encoded = new byte[X25519.PointSize];
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publicKey.Encode(encoded, 0);
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if (!X25519.CalculateAgreement(data, 0, encoded, 0, buf, off))
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throw new InvalidOperationException("X25519 agreement failed");
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#endif
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}
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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public void GenerateSecret(X25519PublicKeyParameters publicKey, Span<byte> buf)
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{
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Span<byte> encoded = stackalloc byte[X25519.PointSize];
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publicKey.Encode(encoded);
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if (!X25519.CalculateAgreement(data, encoded, buf))
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throw new InvalidOperationException("X25519 agreement failed");
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}
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#endif
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private static byte[] Validate(byte[] buf)
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{
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if (buf.Length != KeySize)
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throw new ArgumentException("must have length " + KeySize, nameof(buf));
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return buf;
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}
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}
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}
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#pragma warning restore
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#endif
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