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Viewing changes to external/mono-addins/Mono.Addins.CecilReflector/Mono.Cecil/Mono.Security.Cryptography/CryptoService.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/mono-addins/Mono.Addins.CecilReflector/Mono.Cecil/Mono.Security.Cryptography/CryptoService.cs
 
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//
 
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// CryptoService.cs
 
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//
 
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// Author:
 
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//   Jb Evain (jbevain@gmail.com)
 
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//
 
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// Copyright (c) 2008 - 2010 Jb Evain
 
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//
 
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// Permission is hereby granted, free of charge, to any person obtaining
 
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// a copy of this software and associated documentation files (the
 
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// "Software"), to deal in the Software without restriction, including
 
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// without limitation the rights to use, copy, modify, merge, publish,
 
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// distribute, sublicense, and/or sell copies of the Software, and to
 
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// permit persons to whom the Software is furnished to do so, subject to
 
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// the following conditions:
 
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//
 
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// The above copyright notice and this permission notice shall be
 
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// included in all copies or substantial portions of the Software.
 
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//
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
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//
 
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using System;
 
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using System.IO;
 
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using System.Reflection;
 
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using System.Security.Cryptography;
 
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#if !READ_ONLY
 
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#if !SILVERLIGHT && !CF
 
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using System.Runtime.Serialization;
 
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using Mono.Security.Cryptography;
 
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#endif
 
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using Mono.Cecil.PE;
 
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namespace Mono.Cecil {
 
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        // Most of this code has been adapted
 
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        // from Jeroen Frijters' fantastic work
 
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        // in IKVM.Reflection.Emit. Thanks!
 
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        static class CryptoService {
 
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#if !SILVERLIGHT && !CF
 
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                public static void StrongName (Stream stream, ImageWriter writer, StrongNameKeyPair key_pair)
 
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                {
 
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                        int strong_name_pointer;
 
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                        var strong_name = CreateStrongName (key_pair, HashStream (stream, writer, out strong_name_pointer));
 
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                        PatchStrongName (stream, strong_name_pointer, strong_name);
 
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                }
 
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                static void PatchStrongName (Stream stream, int strong_name_pointer, byte [] strong_name)
 
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                {
 
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                        stream.Seek (strong_name_pointer, SeekOrigin.Begin);
 
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                        stream.Write (strong_name, 0, strong_name.Length);
 
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                }
 
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                static byte [] CreateStrongName (StrongNameKeyPair key_pair, byte [] hash)
 
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                {
 
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                        const string hash_algo = "SHA1";
 
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                        using (var rsa = key_pair.CreateRSA ()) {
 
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                                var formatter = new RSAPKCS1SignatureFormatter (rsa);
 
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                                formatter.SetHashAlgorithm (hash_algo);
 
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                                byte [] signature = formatter.CreateSignature (hash);
 
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                                Array.Reverse (signature);
 
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                                return signature;
 
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                        }
 
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                }
 
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                static byte [] HashStream (Stream stream, ImageWriter writer, out int strong_name_pointer)
 
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                {
 
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                        const int buffer_size = 8192;
 
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                        var text = writer.text;
 
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                        var header_size = (int) writer.GetHeaderSize ();
 
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                        var text_section_pointer = (int) text.PointerToRawData;
 
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                        var strong_name_directory = writer.GetStrongNameSignatureDirectory ();
 
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                        if (strong_name_directory.Size == 0)
 
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                                throw new InvalidOperationException ();
 
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                        strong_name_pointer = (int) (text_section_pointer
 
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                                + (strong_name_directory.VirtualAddress - text.VirtualAddress));
 
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                        var strong_name_length = (int) strong_name_directory.Size;
 
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                        var sha1 = new SHA1Managed ();
 
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                        var buffer = new byte [buffer_size];
 
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                        using (var crypto_stream = new CryptoStream (Stream.Null, sha1, CryptoStreamMode.Write)) {
 
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                                stream.Seek (0, SeekOrigin.Begin);
 
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                                CopyStreamChunk (stream, crypto_stream, buffer, header_size);
 
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                                stream.Seek (text_section_pointer, SeekOrigin.Begin);
 
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                                CopyStreamChunk (stream, crypto_stream, buffer, (int) strong_name_pointer - text_section_pointer);
 
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                                stream.Seek (strong_name_length, SeekOrigin.Current);
 
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                                CopyStreamChunk (stream, crypto_stream, buffer, (int) (stream.Length - (strong_name_pointer + strong_name_length)));
 
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                        }
 
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                        return sha1.Hash;
 
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                }
 
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#endif
 
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                static void CopyStreamChunk (Stream stream, Stream dest_stream, byte [] buffer, int length)
 
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                {
 
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                        while (length > 0) {
 
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                                int read = stream.Read (buffer, 0, System.Math.Min (buffer.Length, length));
 
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                                dest_stream.Write (buffer, 0, read);
 
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                                length -= read;
 
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                        }
 
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                }
 
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                public static byte [] ComputeHash (string file)
 
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                {
 
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                        if (!File.Exists (file))
 
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                                return Empty<byte>.Array;
 
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                        const int buffer_size = 8192;
 
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                        var sha1 = new SHA1Managed ();
 
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                        using (var stream = new FileStream (file, FileMode.Open, FileAccess.Read, FileShare.Read)) {
 
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                                var buffer = new byte [buffer_size];
 
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                                using (var crypto_stream = new CryptoStream (Stream.Null, sha1, CryptoStreamMode.Write))
 
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                                        CopyStreamChunk (stream, crypto_stream, buffer, (int) stream.Length);
 
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                        }
 
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                        return sha1.Hash;
 
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                }
 
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        }
 
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#if !SILVERLIGHT && !CF
 
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        static partial class Mixin {
 
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                public static RSA CreateRSA (this StrongNameKeyPair key_pair)
 
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                {
 
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                        byte [] key;
 
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                        string key_container;
 
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                        if (!TryGetKeyContainer (key_pair, out key, out key_container))
 
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                                return CryptoConvert.FromCapiKeyBlob (key);
 
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                        var parameters = new CspParameters {
 
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                                Flags = CspProviderFlags.UseMachineKeyStore,
 
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                                KeyContainerName = key_container,
 
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                                KeyNumber = 2,
 
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                        };
 
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                        return new RSACryptoServiceProvider (parameters);
 
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                }
 
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                static bool TryGetKeyContainer (ISerializable key_pair, out byte [] key, out string key_container)
 
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                {
 
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                        var info = new SerializationInfo (typeof (StrongNameKeyPair), new FormatterConverter ());
 
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                        key_pair.GetObjectData (info, new StreamingContext ());
 
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                        key = (byte []) info.GetValue ("_keyPairArray", typeof (byte []));
 
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                        key_container = info.GetString ("_keyPairContainer");
 
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                        return key_container != null;
 
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                }
 
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        }
 
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#endif
 
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}
 
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#endif