109 lines
2.4 KiB
C#
109 lines
2.4 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
|
|
#pragma warning disable
|
|
using System;
|
|
|
|
namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Digests
|
|
{
|
|
/**
|
|
* Wrapper class that reduces the output length of a particular digest to
|
|
* only the first n bytes of the digest function.
|
|
*/
|
|
public class ShortenedDigest
|
|
: IDigest
|
|
{
|
|
private IDigest baseDigest;
|
|
private int length;
|
|
|
|
/**
|
|
* Base constructor.
|
|
*
|
|
* @param baseDigest underlying digest to use.
|
|
* @param length length in bytes of the output of doFinal.
|
|
* @exception ArgumentException if baseDigest is null, or length is greater than baseDigest.GetDigestSize().
|
|
*/
|
|
public ShortenedDigest(
|
|
IDigest baseDigest,
|
|
int length)
|
|
{
|
|
if (baseDigest == null)
|
|
{
|
|
throw new ArgumentNullException("baseDigest");
|
|
}
|
|
|
|
if (length > baseDigest.GetDigestSize())
|
|
{
|
|
throw new ArgumentException("baseDigest output not large enough to support length");
|
|
}
|
|
|
|
this.baseDigest = baseDigest;
|
|
this.length = length;
|
|
}
|
|
|
|
public string AlgorithmName
|
|
{
|
|
get { return baseDigest.AlgorithmName + "(" + length * 8 + ")"; }
|
|
}
|
|
|
|
public int GetDigestSize()
|
|
{
|
|
return length;
|
|
}
|
|
|
|
public void Update(byte input)
|
|
{
|
|
baseDigest.Update(input);
|
|
}
|
|
|
|
public void BlockUpdate(byte[] input, int inOff, int length)
|
|
{
|
|
baseDigest.BlockUpdate(input, inOff, length);
|
|
}
|
|
|
|
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
|
|
public void BlockUpdate(ReadOnlySpan<byte> input)
|
|
{
|
|
baseDigest.BlockUpdate(input);
|
|
}
|
|
#endif
|
|
|
|
public int DoFinal(byte[] output, int outOff)
|
|
{
|
|
byte[] tmp = new byte[baseDigest.GetDigestSize()];
|
|
|
|
baseDigest.DoFinal(tmp, 0);
|
|
|
|
Array.Copy(tmp, 0, output, outOff, length);
|
|
|
|
return length;
|
|
}
|
|
|
|
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
|
|
public int DoFinal(Span<byte> output)
|
|
{
|
|
int baseDigestSize = baseDigest.GetDigestSize();
|
|
Span<byte> tmp = baseDigestSize <= 128
|
|
? stackalloc byte[baseDigestSize]
|
|
: new byte[baseDigestSize];
|
|
|
|
baseDigest.DoFinal(tmp);
|
|
|
|
tmp[..length].CopyTo(output);
|
|
|
|
return length;
|
|
}
|
|
#endif
|
|
|
|
public void Reset()
|
|
{
|
|
baseDigest.Reset();
|
|
}
|
|
|
|
public int GetByteLength()
|
|
{
|
|
return baseDigest.GetByteLength();
|
|
}
|
|
}
|
|
}
|
|
#pragma warning restore
|
|
#endif
|