claunia/SharpHash
Archived
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 1 Wiki Activity

Added Adler-32 checksum

Browse Source
This commit is contained in:
Natalia Portillo
2015-02-02 19:16:35 +00:00
parent a1520d6b41
commit c0f6d04cb0
3 changed files with 186 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

176
SharpHash/Checksums/Adler32Context.cs Normal file
View File

@@ -0,0 +1,176 @@
//
// Adler32Context.cs
//
// Author:
// Natalia Portillo <claunia@claunia.com>
//
// Copyright (c) 2015 © Claunia.com
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
using System;
using System.Text;
using System.IO;
namespace SharpHash.Checksums
{
public class Adler32Context
{
private UInt16 sum1, sum2;
private const UInt16 AdlerModule = 65521;
/// <summary>
/// Initializes the Adler-32 sums
/// </summary>
public void Init()
{
sum1 = 1;
sum2 = 0;
}
/// <summary>
/// Updates the hash with data.
/// </summary>
/// <param name="data">Data buffer.</param>
/// <param name="len">Length of buffer to hash.</param>
public void Update(byte[] data, uint len)
{
for (int i = 0; i < len; i++)
{
sum1 = (ushort)((sum1 + data[i]) % AdlerModule);
sum2 = (ushort)((sum2 + sum1) % AdlerModule);
}
}
/// <summary>
/// Updates the hash with data.
/// </summary>
/// <param name="data">Data buffer.</param>
public void Update(byte[] data)
{
Update(data, (uint)data.Length);
}
/// <summary>
/// Returns a byte array of the hash value.
/// </summary>
public byte[] Final()
{
UInt32 finalSum = (uint)((sum2 << 16) | sum1);
return BigEndianBitConverter.GetBytes(finalSum);
}
/// <summary>
/// Returns a hexadecimal representation of the hash value.
/// </summary>
public string End()
{
UInt32 finalSum = (uint)((sum2 << 16) | sum1);
StringBuilder adlerOutput = new StringBuilder();
for (int i = 0; i < BigEndianBitConverter.GetBytes(finalSum).Length; i++)
{
adlerOutput.Append(BigEndianBitConverter.GetBytes(finalSum)[i].ToString("x2"));
}
return adlerOutput.ToString();
}
/// <summary>
/// Gets the hash of a file
/// </summary>
/// <param name="filename">File path.</param>
public static byte[] File(string filename)
{
byte[] hash;
File(filename, out hash);
return hash;
}
/// <summary>
/// Gets the hash of a file in hexadecimal and as a byte array.
/// </summary>
/// <param name="filename">File path.</param>
/// <param name="hash">Byte array of the hash value.</param>
public static string File(string filename, out byte[] hash)
{
FileStream fileStream = new FileStream(filename, FileMode.Open);
UInt16 localSum1, localSum2;
UInt32 finalSum;
localSum1 = 1;
localSum2 = 0;
localSum1 = (ushort)((localSum1 + fileStream.ReadByte()) % AdlerModule);
localSum2 = (ushort)((localSum2 + localSum1) % AdlerModule);
finalSum = (uint)((localSum2 << 16) | localSum1);
hash = BitConverter.GetBytes(finalSum);
StringBuilder adlerOutput = new StringBuilder();
for (int i = 0; i < hash.Length; i++)
{
adlerOutput.Append(hash[i].ToString("x2"));
}
return adlerOutput.ToString();
}
/// <summary>
/// Gets the hash of the specified data buffer.
/// </summary>
/// <param name="data">Data buffer.</param>
/// <param name="len">Length of the data buffer to hash.</param>
/// <param name="hash">Byte array of the hash value.</param>
public string Data(byte[] data, uint len, out byte[] hash)
{
UInt16 localSum1, localSum2;
UInt32 finalSum;
localSum1 = 1;
localSum2 = 0;
for (int i = 0; i < len; i++)
{
localSum1 = (ushort)((localSum1 + data[i]) % AdlerModule);
localSum2 = (ushort)((localSum2 + localSum1) % AdlerModule);
}
finalSum = (uint)((localSum2 << 16) | localSum1);
hash = BitConverter.GetBytes(finalSum);
StringBuilder adlerOutput = new StringBuilder();
for (int i = 0; i < hash.Length; i++)
{
adlerOutput.Append(hash[i].ToString("x2"));
}
return adlerOutput.ToString();
}
/// <summary>
/// Gets the hash of the specified data buffer.
/// </summary>
/// <param name="data">Data buffer.</param>
/// <param name="hash">Byte array of the hash value.</param>
public string Data(byte[] data, out byte[] hash)
{
return Data(data, (uint)data.Length, out hash);
}
}
}

9
SharpHash/Program.cs
View File

@@ -77,6 +77,10 @@ namespace SharpHash
Checksums.Fletcher32Context fletcher32Context = new Checksums.Fletcher32Context();
fletcher32Context.Init();
Console.WriteLine("Initializing Adler-32...");
Checksums.Adler32Context adler32Context = new Checksums.Adler32Context();
adler32Context.Init();
Console.WriteLine("Initializing MD5...");
Checksums.MD5Context md5Context = new Checksums.MD5Context();
md5Context.Init();
@@ -120,6 +124,7 @@ namespace SharpHash
crc64Context.Update(dataBuffer);
fletcher16Context.Update(dataBuffer);
fletcher32Context.Update(dataBuffer);
adler32Context.Update(dataBuffer);
md5Context.Update(dataBuffer);
ripemd160Context.Update(dataBuffer);
sha1Context.Update(dataBuffer);
@@ -137,6 +142,7 @@ namespace SharpHash
crc64Context.Update(dataBuffer);
fletcher16Context.Update(dataBuffer);
fletcher32Context.Update(dataBuffer);
adler32Context.Update(dataBuffer);
md5Context.Update(dataBuffer);
ripemd160Context.Update(dataBuffer);
sha1Context.Update(dataBuffer);
@@ -155,6 +161,7 @@ namespace SharpHash
crc64Context.Update(dataBuffer);
fletcher16Context.Update(dataBuffer);
fletcher32Context.Update(dataBuffer);
adler32Context.Update(dataBuffer);
md5Context.Update(dataBuffer);
ripemd160Context.Update(dataBuffer);
sha1Context.Update(dataBuffer);
@@ -169,6 +176,7 @@ namespace SharpHash
byte[] crc64Hash = crc64Context.Final();
byte[] fletcher16Hash = fletcher16Context.Final();
byte[] fletcher32Hash = fletcher32Context.Final();
byte[] adler32Hash = adler32Context.Final();
byte[] md5Hash = md5Context.Final();
byte[] ripemd160Hash = ripemd160Context.Final();
byte[] sha1Hash = sha1Context.Final();
@@ -183,6 +191,7 @@ namespace SharpHash
Console.WriteLine("CRC64: {0}", stringify(crc64Hash));
Console.WriteLine("Fletcher-16: {0}", stringify(fletcher16Hash));
Console.WriteLine("Fletcher-32: {0}", stringify(fletcher32Hash));
Console.WriteLine("Adler-32: {0}", stringify(adler32Hash));
Console.WriteLine("MD5: {0}", stringify(md5Hash));
Console.WriteLine("RIPEMD160: {0}", stringify(ripemd160Hash));
Console.WriteLine("SHA1: {0}", stringify(sha1Hash));

1
SharpHash/SharpHash.csproj
View File

@@ -50,6 +50,7 @@
<Compile Include="BigEndianBitConverter.cs" />
<Compile Include="Checksums\SHA3Context.cs" />
<Compile Include="Checksums\FletcherContext.cs" />
<Compile Include="Checksums\Adler32Context.cs" />
</ItemGroup>
<Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
<ItemGroup>