147 lines
4.5 KiB
C#
147 lines
4.5 KiB
C#
//
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// MD5Context.cs
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//
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// Author:
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// Natalia Portillo <claunia@claunia.com>
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//
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// Copyright (c) 2015 © Claunia.com
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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using System.Security.Cryptography;
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using System.Text;
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using System.IO;
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namespace SharpHash.Checksums
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{
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/// <summary>
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/// Provides a UNIX similar API to .NET MD5.
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/// </summary>
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public class MD5Context
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{
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MD5 _md5Provider;
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/// <summary>
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/// Initializes the MD5 hash provider
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/// </summary>
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public void Init()
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{
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_md5Provider = MD5.Create();
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}
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/// <summary>
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/// Updates the hash with data.
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/// </summary>
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/// <param name="data">Data buffer.</param>
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/// <param name="len">Length of buffer to hash.</param>
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public void Update(byte[] data, uint len)
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{
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_md5Provider.TransformBlock(data, 0, (int)len, data, 0);
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}
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/// <summary>
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/// Updates the hash with data.
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/// </summary>
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/// <param name="data">Data buffer.</param>
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public void Update(byte[] data)
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{
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Update(data, (uint)data.Length);
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}
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/// <summary>
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/// Returns a byte array of the hash value.
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/// </summary>
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public byte[] Final()
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{
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_md5Provider.TransformFinalBlock(new byte[0], 0, 0);
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return _md5Provider.Hash;
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}
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/// <summary>
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/// Returns a hexadecimal representation of the hash value.
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/// </summary>
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public string End()
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{
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_md5Provider.TransformFinalBlock(new byte[0], 0, 0);
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StringBuilder md5Output = new StringBuilder();
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for (int i = 0; i < _md5Provider.Hash.Length; i++)
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{
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md5Output.Append(_md5Provider.Hash[i].ToString("x2"));
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}
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return md5Output.ToString();
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}
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/// <summary>
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/// Gets the hash of a file
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/// </summary>
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/// <param name="filename">File path.</param>
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public byte[] File(string filename)
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{
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FileStream fileStream = new FileStream(filename, FileMode.Open);
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return _md5Provider.ComputeHash(fileStream);
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}
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/// <summary>
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/// Gets the hash of a file in hexadecimal and as a byte array.
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/// </summary>
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/// <param name="filename">File path.</param>
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/// <param name="hash">Byte array of the hash value.</param>
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public string File(string filename, out byte[] hash)
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{
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FileStream fileStream = new FileStream(filename, FileMode.Open);
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hash = _md5Provider.ComputeHash(fileStream);
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StringBuilder md5Output = new StringBuilder();
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for (int i = 0; i < hash.Length; i++)
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{
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md5Output.Append(hash[i].ToString("x2"));
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}
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return md5Output.ToString();
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}
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/// <summary>
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/// Gets the hash of the specified data buffer.
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/// </summary>
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/// <param name="data">Data buffer.</param>
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/// <param name="len">Length of the data buffer to hash.</param>
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/// <param name="hash">Byte array of the hash value.</param>
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public string Data(byte[] data, uint len, out byte[] hash)
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{
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hash = _md5Provider.ComputeHash(data, 0, (int)len);
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StringBuilder md5Output = new StringBuilder();
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for (int i = 0; i < hash.Length; i++)
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{
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md5Output.Append(hash[i].ToString("x2"));
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}
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return md5Output.ToString();
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}
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/// <summary>
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/// Gets the hash of the specified data buffer.
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/// </summary>
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/// <param name="data">Data buffer.</param>
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/// <param name="hash">Byte array of the hash value.</param>
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public string Data(byte[] data, out byte[] hash)
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{
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return Data(data, (uint)data.Length, out hash);
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}
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}
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}
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