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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.IO;
using Test.Cryptography;
using Xunit;
namespace System.Security.Cryptography.Hashing.Algorithms.Tests
{
public abstract class HashAlgorithmTest
{
protected abstract HashAlgorithm Create();
protected void Verify(string input, string output)
{
Verify(ByteUtils.AsciiBytes(input), output);
}
protected void Verify(Stream input, string output)
{
byte[] expected = ByteUtils.HexToByteArray(output);
byte[] actual;
using (HashAlgorithm hash = Create())
{
Assert.True(hash.HashSize > 0);
actual = hash.ComputeHash(input);
}
Assert.Equal(expected, actual);
}
protected void Verify(byte[] input, string output)
{
byte[] expected = ByteUtils.HexToByteArray(output);
byte[] actual;
using (HashAlgorithm hash = Create())
{
Assert.True(hash.HashSize > 0);
actual = hash.ComputeHash(input, 0, input.Length);
}
Assert.Equal(expected, actual);
}
protected void VerifyRepeating(string input, int repeatCount, string output)
{
using (Stream stream = new DataRepeatingStream(input, repeatCount))
{
Verify(stream, output);
}
}
[Fact]
public void InvalidInput_Null()
{
using (HashAlgorithm hash = Create())
{
Assert.Throws<ArgumentNullException>("buffer", () => hash.ComputeHash((byte[])null));
Assert.Throws<ArgumentNullException>("buffer", () => hash.ComputeHash(null, 0, 0));
Assert.Throws<NullReferenceException>(() => hash.ComputeHash((Stream)null));
}
}
[Fact]
public void InvalidInput_NegativeOffset()
{
using (HashAlgorithm hash = Create())
{
Assert.Throws<ArgumentOutOfRangeException>("offset", () => hash.ComputeHash(Array.Empty<byte>(), -1, 0));
}
}
[Fact]
public void InvalidInput_NegativeCount()
{
using (HashAlgorithm hash = Create())
{
Assert.Throws<ArgumentException>(null, () => hash.ComputeHash(Array.Empty<byte>(), 0, -1));
}
}
[Fact]
public void InvalidInput_TooBigOffset()
{
using (HashAlgorithm hash = Create())
{
Assert.Throws<ArgumentException>(null, () => hash.ComputeHash(Array.Empty<byte>(), 1, 0));
}
}
[Fact]
public void InvalidInput_TooBigCount()
{
byte[] nonEmpty = new byte[53];
using (HashAlgorithm hash = Create())
{
Assert.Throws<ArgumentException>(null, () => hash.ComputeHash(nonEmpty, 0, nonEmpty.Length + 1));
Assert.Throws<ArgumentException>(null, () => hash.ComputeHash(nonEmpty, 1, nonEmpty.Length));
Assert.Throws<ArgumentException>(null, () => hash.ComputeHash(nonEmpty, 2, nonEmpty.Length - 1));
Assert.Throws<ArgumentException>(null, () => hash.ComputeHash(Array.Empty<byte>(), 0, 1));
}
}
[Fact]
public void BoundaryCondition_Count0()
{
byte[] nonEmpty = new byte[53];
using (HashAlgorithm hash = Create())
{
byte[] emptyHash = hash.ComputeHash(Array.Empty<byte>());
byte[] shouldBeEmptyHash = hash.ComputeHash(nonEmpty, nonEmpty.Length, 0);
Assert.Equal(emptyHash, shouldBeEmptyHash);
shouldBeEmptyHash = hash.ComputeHash(nonEmpty, 0, 0);
Assert.Equal(emptyHash, shouldBeEmptyHash);
nonEmpty[0] = 0xFF;
nonEmpty[nonEmpty.Length - 1] = 0x77;
shouldBeEmptyHash = hash.ComputeHash(nonEmpty, nonEmpty.Length, 0);
Assert.Equal(emptyHash, shouldBeEmptyHash);
shouldBeEmptyHash = hash.ComputeHash(nonEmpty, 0, 0);
Assert.Equal(emptyHash, shouldBeEmptyHash);
}
}
[Fact]
public void OffsetAndCountRespected()
{
byte[] dataA = { 1, 1, 2, 3, 5, 8 };
byte[] dataB = { 0, 1, 1, 2, 3, 5, 8, 13 };
using (HashAlgorithm hash = Create())
{
byte[] baseline = hash.ComputeHash(dataA);
// Skip the 0 byte, and stop short of the 13.
byte[] offsetData = hash.ComputeHash(dataB, 1, dataA.Length);
Assert.Equal(baseline, offsetData);
}
}
protected class DataRepeatingStream : Stream
{
private int _remaining;
private byte[] _data;
public DataRepeatingStream(string data, int repeatCount)
{
_remaining = repeatCount;
_data = ByteUtils.AsciiBytes(data);
}
public override int Read(byte[] buffer, int offset, int count)
{
if (!CanRead)
{
throw new NotSupportedException();
}
if (count < _data.Length)
{
throw new InvalidOperationException();
}
if (_remaining == 0)
{
return 0;
}
int multiple = count / _data.Length;
if (multiple > _remaining)
{
multiple = _remaining;
}
int localOffset = offset;
for (int i = 0; i < multiple; i++)
{
Buffer.BlockCopy(_data, 0, buffer, localOffset, _data.Length);
localOffset += _data.Length;
}
_remaining -= multiple;
return _data.Length * multiple;
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
_data = null;
}
}
public override void Flush()
{
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override void SetLength(long value)
{
throw new NotSupportedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotSupportedException();
}
public override bool CanRead { get { return _data != null; } }
public override bool CanSeek { get { return false; } }
public override bool CanWrite { get { return false; } }
public override long Length { get { throw new NotSupportedException(); } }
public override long Position
{
get { throw new NotSupportedException(); }
set { throw new NotSupportedException(); }
}
}
}
}
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