root / trunk / Pithos.Network / Signature.cs @ 9d2c0fc0
History | View | Annotate | Download (11.2 kB)
1 |
#region |
---|---|
2 |
/* ----------------------------------------------------------------------- |
3 |
* <copyright file="Signature.cs" company="GRNet"> |
4 |
* |
5 |
* Copyright 2011-2012 GRNET S.A. All rights reserved. |
6 |
* |
7 |
* Redistribution and use in source and binary forms, with or |
8 |
* without modification, are permitted provided that the following |
9 |
* conditions are met: |
10 |
* |
11 |
* 1. Redistributions of source code must retain the above |
12 |
* copyright notice, this list of conditions and the following |
13 |
* disclaimer. |
14 |
* |
15 |
* 2. Redistributions in binary form must reproduce the above |
16 |
* copyright notice, this list of conditions and the following |
17 |
* disclaimer in the documentation and/or other materials |
18 |
* provided with the distribution. |
19 |
* |
20 |
* |
21 |
* THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS |
22 |
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
23 |
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
24 |
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR |
25 |
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
26 |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
27 |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
28 |
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
29 |
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
30 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
31 |
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
32 |
* POSSIBILITY OF SUCH DAMAGE. |
33 |
* |
34 |
* The views and conclusions contained in the software and |
35 |
* documentation are those of the authors and should not be |
36 |
* interpreted as representing official policies, either expressed |
37 |
* or implied, of GRNET S.A. |
38 |
* </copyright> |
39 |
* ----------------------------------------------------------------------- |
40 |
*/ |
41 |
#endregion |
42 |
using System; |
43 |
using System.Collections.Concurrent; |
44 |
using System.Collections.Generic; |
45 |
using System.Diagnostics.Contracts; |
46 |
using System.IO; |
47 |
using System.Reflection; |
48 |
using System.Runtime.Remoting.Metadata.W3cXsd2001; |
49 |
using System.Security.Cryptography; |
50 |
using System.Threading.Tasks; |
51 |
using System.Linq; |
52 |
|
53 |
namespace Pithos.Network |
54 |
{ |
55 |
public static class Signature |
56 |
{ |
57 |
private static readonly log4net.ILog Log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); |
58 |
|
59 |
public static string CalculateMD5(FileInfo info) |
60 |
{ |
61 |
if (info==null) |
62 |
throw new ArgumentNullException("info"); |
63 |
if (String.IsNullOrWhiteSpace(info.FullName)) |
64 |
throw new ArgumentException("info.FullName is empty","info"); |
65 |
Contract.EndContractBlock(); |
66 |
|
67 |
return CalculateMD5(info.FullName); |
68 |
} |
69 |
|
70 |
public static string CalculateMD5(string path) |
71 |
{ |
72 |
if (String.IsNullOrWhiteSpace(path)) |
73 |
throw new ArgumentNullException("path"); |
74 |
Contract.EndContractBlock(); |
75 |
|
76 |
//DON'T calculate hashes for folders |
77 |
if (Directory.Exists(path)) |
78 |
return ""; |
79 |
|
80 |
string hash; |
81 |
using (var hasher = MD5.Create()) |
82 |
using (var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, true)) |
83 |
{ |
84 |
var hashBytes = hasher.ComputeHash(stream); |
85 |
hash = hashBytes.ToHashString(); |
86 |
} |
87 |
return hash; |
88 |
} |
89 |
|
90 |
/* |
91 |
public static string BytesToString(byte[] hashBytes) |
92 |
{ |
93 |
var shb=new SoapHexBinary(hashBytes); |
94 |
return shb.ToString(); |
95 |
|
96 |
} |
97 |
|
98 |
|
99 |
public static byte[] StringToBytes(string hash) |
100 |
{ |
101 |
var shb=SoapHexBinary.Parse(hash); |
102 |
return shb.Value; |
103 |
} |
104 |
*/ |
105 |
|
106 |
public static byte[] ToBytes(this string hash) |
107 |
{ |
108 |
var shb = SoapHexBinary.Parse(hash); |
109 |
return shb.Value; |
110 |
} |
111 |
|
112 |
public static string ToHashString(this byte[] hashBytes) |
113 |
{ |
114 |
var shb = new SoapHexBinary(hashBytes); |
115 |
return shb.ToString().ToLower(); |
116 |
} |
117 |
|
118 |
public static TreeHash CalculateTreeHash(FileInfo fileInfo, int blockSize, string algorithm) |
119 |
{ |
120 |
if (fileInfo==null) |
121 |
throw new ArgumentNullException("fileInfo"); |
122 |
if (String.IsNullOrWhiteSpace(fileInfo.FullName)) |
123 |
throw new ArgumentException("fileInfo.FullName is empty","fileInfo"); |
124 |
if (blockSize <= 0) |
125 |
throw new ArgumentOutOfRangeException("blockSize", "blockSize must be a value greater than zero "); |
126 |
if (String.IsNullOrWhiteSpace(algorithm)) |
127 |
throw new ArgumentNullException("algorithm"); |
128 |
Contract.EndContractBlock(); |
129 |
|
130 |
return CalculateTreeHash(fileInfo.FullName, blockSize, algorithm); |
131 |
} |
132 |
|
133 |
/// <summary> |
134 |
/// Calculates a file's tree hash synchronously, using the specified block size |
135 |
/// </summary> |
136 |
/// <param name="filePath">Path to an existing file</param> |
137 |
/// <param name="blockSize">Block size used to calculate leaf hashes</param> |
138 |
/// <param name="algorithm"></param> |
139 |
/// <returns>A <see cref="TreeHash"/> with the block hashes and top hash</returns> |
140 |
public static TreeHash CalculateTreeHash(string filePath, int blockSize, string algorithm) |
141 |
{ |
142 |
if (String.IsNullOrWhiteSpace(filePath)) |
143 |
throw new ArgumentNullException("filePath"); |
144 |
if (blockSize<=0) |
145 |
throw new ArgumentOutOfRangeException("blockSize","blockSize must be a value greater than zero "); |
146 |
if (String.IsNullOrWhiteSpace(algorithm)) |
147 |
throw new ArgumentNullException("algorithm"); |
148 |
Contract.EndContractBlock(); |
149 |
|
150 |
var hash=CalculateTreeHashAsync(filePath, blockSize, algorithm, 2); |
151 |
return hash.Result; |
152 |
} |
153 |
|
154 |
public static async Task<TreeHash> CalculateTreeHashAsync(FileInfo fileInfo, int blockSize, string algorithm, byte parallelism) |
155 |
{ |
156 |
if (fileInfo == null) |
157 |
throw new ArgumentNullException("fileInfo"); |
158 |
if (String.IsNullOrWhiteSpace(fileInfo.FullName)) |
159 |
throw new ArgumentNullException("fileInfo.FullName is empty","fileInfo"); |
160 |
if (blockSize <= 0) |
161 |
throw new ArgumentOutOfRangeException("blockSize", "blockSize must be a value greater than zero "); |
162 |
if (String.IsNullOrWhiteSpace(algorithm)) |
163 |
throw new ArgumentNullException("algorithm"); |
164 |
Contract.EndContractBlock(); |
165 |
|
166 |
return await CalculateTreeHashAsync(fileInfo.FullName, blockSize, algorithm, parallelism); |
167 |
} |
168 |
|
169 |
|
170 |
public static async Task<TreeHash> CalculateTreeHashAsync(string filePath, int blockSize,string algorithm, int parallelism) |
171 |
{ |
172 |
if (String.IsNullOrWhiteSpace(filePath)) |
173 |
throw new ArgumentNullException("filePath"); |
174 |
if (blockSize <= 0) |
175 |
throw new ArgumentOutOfRangeException("blockSize", "blockSize must be a value greater than zero "); |
176 |
if (String.IsNullOrWhiteSpace(algorithm)) |
177 |
throw new ArgumentNullException("algorithm"); |
178 |
Contract.EndContractBlock(); |
179 |
|
180 |
//DON'T calculate hashes for folders |
181 |
if (Directory.Exists(filePath)) |
182 |
return new TreeHash(algorithm); |
183 |
//The hash of a non-existent file is the empty hash |
184 |
if (!File.Exists(filePath)) |
185 |
return new TreeHash(algorithm); |
186 |
|
187 |
//Calculate the hash of all blocks using a blockhash iterator |
188 |
using (var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, blockSize, true)) |
189 |
{ |
190 |
//Calculate the blocks asyncrhonously |
191 |
var hashes = await BlockHashAlgorithms.CalculateBlockHashesInPlacePFor(stream, blockSize, algorithm, parallelism); |
192 |
|
193 |
//And then proceed with creating and returning a TreeHash |
194 |
var length = stream.Length; |
195 |
var list = hashes.OrderBy(pair => pair.Key).Select(pair => pair.Value).ToList(); |
196 |
|
197 |
var treeHash = new TreeHash(algorithm) |
198 |
{ |
199 |
Bytes = length, |
200 |
BlockSize = blockSize, |
201 |
Hashes = list |
202 |
}; |
203 |
|
204 |
return treeHash; |
205 |
} |
206 |
} |
207 |
|
208 |
|
209 |
public static byte[] CalculateTopHash(IList<byte[]> hashMap, string algorithm) |
210 |
{ |
211 |
if (hashMap == null) |
212 |
throw new ArgumentNullException("hashMap"); |
213 |
if (String.IsNullOrWhiteSpace(algorithm)) |
214 |
throw new ArgumentNullException("algorithm"); |
215 |
Contract.EndContractBlock(); |
216 |
|
217 |
var hashCount = hashMap.Count; |
218 |
//The tophash of an empty hashmap is an empty array |
219 |
if (hashCount == 0) |
220 |
return new byte[0]; |
221 |
//The tophash of a one-item hashmap is the hash itself |
222 |
if (hashCount == 1) |
223 |
return hashMap[0]; |
224 |
|
225 |
//Calculate the required number of leaf nodes |
226 |
var leafs =(int)Math.Pow(2, Math.Ceiling(Math.Log(hashCount,2))); |
227 |
//The size of all nodes is the same and equal to the size of the input hashes |
228 |
var hashSize = hashMap[0].Length; |
229 |
|
230 |
//If the hashmap containes fewer nodes than the required leaf count, we need to fill |
231 |
//the rest with empty blocks |
232 |
byte[] empty=null; |
233 |
if (hashCount < leafs) |
234 |
empty = new byte[hashSize]; |
235 |
|
236 |
//New hashes will be stored in a dictionary keyed by their step to preserve order |
237 |
var newHashes=new ConcurrentDictionary<int, byte[]>(); |
238 |
|
239 |
Parallel.For(0, leafs/2, |
240 |
(step, state) => |
241 |
{ |
242 |
using (var hasher = HashAlgorithm.Create(algorithm)) |
243 |
{ |
244 |
var i = step*2; |
245 |
var block1 = i <= hashCount - 1 ? hashMap[i] : empty; |
246 |
var block2 = i <= hashCount - 2 ? hashMap[i + 1] : empty; |
247 |
|
248 |
hasher.TransformBlock(block1, 0, block1.Length, null, 0); |
249 |
hasher.TransformFinalBlock(block2, 0, block2.Length); |
250 |
|
251 |
var finalHash = hasher.Hash; |
252 |
//Store the final value in its proper place |
253 |
newHashes[step] = finalHash; |
254 |
} |
255 |
}); |
256 |
|
257 |
//Extract the hashes to a list ordered by their step |
258 |
var hashes = newHashes.OrderBy(pair => pair.Key).Select(pair => pair.Value).ToList(); |
259 |
return CalculateTopHash(hashes, algorithm); |
260 |
} |
261 |
|
262 |
|
263 |
public static byte[] CalculateHash(byte[] buffer,string algorithm) |
264 |
{ |
265 |
if (buffer == null) |
266 |
throw new ArgumentNullException("buffer"); |
267 |
if (String.IsNullOrWhiteSpace(algorithm)) |
268 |
throw new ArgumentNullException("algorithm"); |
269 |
Contract.EndContractBlock(); |
270 |
|
271 |
using (var hasher = HashAlgorithm.Create(algorithm)) |
272 |
{ |
273 |
var hash = hasher.ComputeHash(buffer, 0, buffer.Length); |
274 |
return hash; |
275 |
} |
276 |
} |
277 |
} |
278 |
} |
279 |
|
280 |
|
281 |
|