blocks|key|418440|text|所以我终于想明白了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|418441|“info散列”是对包含以下内容的洪流文件部分的SHA1哈希：|418442|项目:长度(大小)和路径(带有文件名的路径)|ordered-list-item|418443|名称:要搜索的名称|418444|单件长度:单件的长度(大小)|418445|片段:这条激流的每一块SHA1哈希|418446|私有:限制访问的标志|418447|为了更好地展示这一点，我使用了一个随机的洪流文件，并使用了来自于终极版的“BEncode编辑器”，使它对我来说更加清晰。|418448|​|418449|📷|atomic|offset|length|418450|418451|如您所见，红色框标记了洪流文件的信息部分。torrent文件不包括项目的哈希，而是包含每个片段的散列。|418452|item1的地址为:+1069496548|unordered-list-item|418453|和item2与:+223|418454|它在一起:+1069496771|418455|单件尺寸:+524288|418456|一共有2040块。(1069496771/524288约=2039.9032)|418457|chars部分包含40800字节的数据，即文件中的81600+%2B2个字符。|418458|%2B2，因为0x标志着这是十六进制。|418459|一个SHA1散列有400个字符或20字节的数据，即2040+SHA1散列。|418460|418461|418462|418463|很抱歉，这个信息是关于一场导致非法电影的洪流的，但是我想用一个真实存在的洪流。|418464|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/4bb4789cc0bf73573e6b241663df5b2c.png|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/689541ffc42957fc9773273142dc826f.png^0|0|0|0|0|0|0|0|0|0|0|1|0|0|0|0|0|0|0|0|0|0|0|0|0|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|1X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1Z|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|20|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|21|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|22|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|23|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|24|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|25|8|@]|9|@]|A|$]]|$1|S|3|T|5|U|7|26|8|@]|9|@$V|27|W|28|1|29]]|A|$]]|$1|X|3|R|5|6|7|2A|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|2B|8|@]|9|@]|A|$]]|$1|10|3|11|5|12|7|2C|8|@]|9|@]|A|$]]|$1|13|3|14|5|12|7|2D|8|@]|9|@]|A|$]]|$1|15|3|16|5|12|7|2E|8|@]|9|@]|A|$]]|$1|17|3|18|5|12|7|2F|8|@]|9|@]|A|$]]|$1|19|3|1A|5|12|7|2G|8|@]|9|@]|A|$]]|$1|1B|3|1C|5|12|7|2H|8|@]|9|@]|A|$]]|$1|1D|3|1E|5|12|7|2I|8|@]|9|@]|A|$]]|$1|1F|3|1G|5|12|7|2J|8|@]|9|@]|A|$]]|$1|1H|3|R|5|6|7|2K|8|@]|9|@]|A|$]]|$1|1I|3|T|5|U|7|2L|8|@]|9|@$V|2M|W|2N|1|2O]]|A|$]]|$1|1J|3|R|5|6|7|2P|8|@]|9|@]|A|$]]|$1|1K|3|1L|5|6|7|2Q|8|@]|9|@]|A|$]]|$1|1M|3|-4|5|6|7|2R|8|@]|9|@]|A|$]]]|1N|$1O|$5|1P|1Q|1R|A|$1S|1T|1U|-4]]|1V|$5|1P|1Q|1R|A|$1S|1W|1U|-4]]]]

So I finally figured it out.

The “infohash” is the SHA1 Hash over the part of a torrent file that includes:

<ol>
<li>ITEM: length(size) and path (path with filename)</li>
<li>Name: The name to search for</li>
<li>Piece length: The length(size) of a single piece</li>
<li>Pieces: SHA1 Hash of EVERY piece of this torrent</li>
<li>Private: flag for restricted access</li>
</ol>

To show this a little more I took a random torrent file and used the “BEncode Editor” from Ultima to make it more clearly to me.

<img src="https://i.stack.imgur.com/VnTf8.png" alt="BEncode Editor">

As you can see the the red box marked the information part of the torrent file.
The torrent file includes not the Hash of the items, but the hashes of every piece.

<ul>
<li>For item1 with: 1069496548</li>
<li>and item2 with: 223</li>
<li>It is together: 1069496771</li>
<li>With a piece size of: 524288</li>
<li>There are 2040 pieces. (1069496771/524288=2039.9032 approximately)</li>
<li>The pieces section includes 40800 byte of data what are 81600 + 2 chars in the file.</li>
<li>the +2 because 0x marks that this is hexadecimal.</li>
<li>A SHA1 hash has 40 0x chars or 20 Byte of data what are 2040 SHA1 hashes.</li>
</ul>

<img src="https://i.stack.imgur.com/8XIe7.png" alt="enter image description here">

I am sorry that this information is about a torrent that leads to a illegal movie, but i wanted to use a torrent that realy exists.

blocks|key|418471|text|以下是如何为bittorrent“info散列”提取*.torrent数据的相关片段。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|418472|我做了个例子。|418473|0000000:+6438+3A61+6E6E+6F75+6E63+6530+3A31+303A++d8:announce0:10:
0000010:+6372+6561+7465+6420+6279+3133+3A6D+6B74++created+by13:mkt
0000020:+6F72+7265+6E74+2031+2E30+3133+3A63+7265++orrent+1.013:cre
0000030:+6174+696F+6E20+6461+7465+6931+3537+3037++ation+datei15707
0000040:+3530+3238+3565+343A+696E+666F+6436+3A6C++50285e4:infod6:l
0000050:+656E+6774+6869+3230+6534+3A6E+616D+6534++engthi20e4:name4
0000060:+3A70+7269+7631+323A+7069+6563+6520+6C65++:priv12:piece+le
0000070:+6E67+7468+6932+3632+3134+3465+363A+7069++ngthi262144e6:pi
0000080:+6563+6573+3230+3AF1+D7EE+4236+3434+D06F++eces20:...B644.o
0000090:+27C4+BBAD+87F0+F089+7A22+2B37+3A70+7269++'.......z"%2B7:pri
00000a0:+7661+7465+6931+6565+65+++++++++++++++++++vatei1eee|code-block|syntax|javascript|418474|“info”键的内容介于(包括)偏移量0x4D和0xA7之间。所以…|418475|#!/crit/shell/bsh
bbe++\
++++-e+'
++++++++d+0x0+0x4C+;
++++++++d+0xA8+*+;
++++++'++\
++++${example}+++\
+%7C
shasum++-a+1++-b|418476|你应该看看这个：|418477|1799a58b9f8ff2b9b9bcecd0d438c5f37f19a31c+*-|418478|下面是xxd输出，而不是shasum，以作更详细的说明：|offset|length|style|CODE|418479|0000000:+6436+3A6C+656E+6774+6869+3230+6534+3A6E++d6:lengthi20e4:n
0000010:+616D+6534+3A70+7269+7631+323A+7069+6563++ame4:priv12:piec
0000020:+6520+6C65+6E67+7468+6932+3632+3134+3465++e+lengthi262144e
0000030:+363A+7069+6563+6573+3230+3AF1+D7EE+4236++6:pieces20:...B6
0000040:+3434+D06F+27C4+BBAD+87F0+F089+7A22+2B37++44.o'.......z"%2B7
0000050:+3A70+7269+7661+7465+6931+6565++++++++++++:privatei1ee|418480|您可以参考BitTorrent协议规范来解释它们的名称，尽管这是一种简洁的、语法上不优雅的解释，以及为什么需要排除最后的0x65。|418481|简洁:整个数据被封装在一对US-ASCII‘d’和‘e’中；“info”键或字段的内容也是如此。您需要在第一个0x64+-‘d’之间的所有东西，它继承了US-ASCII字符串4:info，以及终端0x65+-‘e’，与前面提到的0x64配对。|418482|entityMap|0|LINK|mutability|MUTABLE|url|http://www.bittorrent.org/beps/bep_0003.html^0|0|0|0|0|0|0|0|3|3|C|6|0|0|5|E|0|0|2F|6|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1C|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1D|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|1E|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|1F|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|1G|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|1H|8|@$S|1I|T|1J|U|V]|$S|1K|T|1L|U|V]]|9|@]|A|$]]|$1|W|3|X|5|F|7|1M|8|@]|9|@]|A|$G|H]]|$1|Y|3|Z|5|6|7|1N|8|@]|9|@$S|1O|T|1P|1|1Q]]|A|$]]|$1|10|3|11|5|6|7|1R|8|@$S|1S|T|1T|U|V]]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]]]

Here's how to pull the pertinent segment of a *.torrent datum for a bittorrent “info hash”.

I made this for an example.

<pre><code>0000000: 6438 3A61 6E6E 6F75 6E63 6530 3A31 303A d8:announce0:10:
0000010: 6372 6561 7465 6420 6279 3133 3A6D 6B74 created by13:mkt
0000020: 6F72 7265 6E74 2031 2E30 3133 3A63 7265 orrent 1.013:cre
0000030: 6174 696F 6E20 6461 7465 6931 3537 3037 ation datei15707
0000040: 3530 3238 3565 343A 696E 666F 6436 3A6C 50285e4:infod6:l
0000050: 656E 6774 6869 3230 6534 3A6E 616D 6534 engthi20e4:name4
0000060: 3A70 7269 7631 323A 7069 6563 6520 6C65 :priv12:piece le
0000070: 6E67 7468 6932 3632 3134 3465 363A 7069 ngthi262144e6:pi
0000080: 6563 6573 3230 3AF1 D7EE 4236 3434 D06F eces20:...B644.o
0000090: 27C4 BBAD 87F0 F089 7A22 2B37 3A70 7269 '.......z"+7:pri
00000a0: 7661 7465 6931 6565 65 vatei1eee
</code></pre>

The content of the “info” key is between (inclusive) offsets 0x4D and 0xA7. So…

<pre><code>#!/crit/shell/bsh
bbe \
 -e '
 d 0x0 0x4C ;
 d 0xA8 * ;
 ' \
 ${example} \
 |
shasum -a 1 -b
</code></pre>

You should see this:

<pre><code>1799a58b9f8ff2b9b9bcecd0d438c5f37f19a31c *-
</code></pre>

Here is the <code>xxd</code> output, in–lieu of <code>shasum</code>, for more elucidation:

<pre><code>0000000: 6436 3A6C 656E 6774 6869 3230 6534 3A6E d6:lengthi20e4:n
0000010: 616D 6534 3A70 7269 7631 323A 7069 6563 ame4:priv12:piec
0000020: 6520 6C65 6E67 7468 6932 3632 3134 3465 e lengthi262144e
0000030: 363A 7069 6563 6573 3230 3AF1 D7EE 4236 6:pieces20:...B6
0000040: 3434 D06F 27C4 BBAD 87F0 F089 7A22 2B37 44.o'.......z"+7
0000050: 3A70 7269 7661 7465 6931 6565 :privatei1ee
</code></pre>

You can refer to <a href="http://www.bittorrent.org/beps/bep_0003.html" rel="nofollow noreferrer">The BitTorrent Protocol Specification</a> for an explanation, albeit a terse and rather grammatically inelegant one, as to their nomenclature and why the final 0x65 needs be excluded. 
Concisely: the entire datum is encased in a pair of US-ASCII ‘d’ and ‘e’; the content of the “info” key, or field, is similarly so encased. You want everything between the first 0x64 — ‘d’, — which succeeds the US-ASCII string <code>4:info</code>, and the terminal 0x65 — ‘e’, — which is paired with the aforementioned 0x64.

blocks|key|418545|text|我想增加另一个例子，稍微具体一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|418546|我们从我拥有的一个最小的.torrent文件开始：|offset|length|style|CODE|418547|64+34+3A+69+6E+66+6F+64+35+3A+66+69+6C+65+73+6C+64+36+3A+6C+65+6E+67+74+
68+69+36+31+35+65+34+3A+70+61+74+68+6C+32+36+3A+66+72+65+65+20+61+75+64+
69+6F+62+6F+6F+6B+20+76+65+72+73+69+6F+6E+2E+74+78+74+65+65+64+36+3A+6C+
65+6E+67+74+68+69+33+39+33+34+31+37+65+34+3A+70+61+74+68+6C+36+31+3A+57+
61+72+63+72+61+66+74+5F+20+4F+66+66+69+63+69+61+6C+20+4D+6F+76+69+65+20+
4E+6F+76+65+6C+69+7A+61+74+69+6F+6E+20+62+79+20+43+68+72+69+73+74+69+65+
20+47+6F+6C+64+65+6E+2E+65+70+75+62+65+65+65+34+3A+6E+61+6D+65+36+31+3A+
57+61+72+63+72+61+66+74+5F+20+4F+66+66+69+63+69+61+6C+20+4D+6F+76+69+65+
20+4E+6F+76+65+6C+69+7A+61+74+69+6F+6E+20+62+79+20+43+68+72+69+73+74+69+
65+20+47+6F+6C+64+65+6E+20+45+50+55+42+31+32+3A+70+69+65+63+65+20+6C+65+
6E+67+74+68+69+31+30+34+38+35+37+36+65+36+3A+70+69+65+63+65+73+32+30+3A+
43+92+4C+22+BB+42+9E+EA+BD+FF+66+C6+79+4C+29+E4+F9+D0+F3+B9+65+65|code-block|syntax|javascript|418548|如果我们解码BEncoding：|418549|64+++++++++++++++++++++++++++++++++++++++++++++;+DICTIONARY+(d)
%7C++34+3A+69+6E+66+6F+++++++++++++++++++++++++++;++-+4:info
%7C++64++++++++++++++++++++++++++++++++++++++++++;++-+DICTIONARY+(d)
%7C++%7C++35+3A+66+69+6C+65+73+++++++++++++++++++++;+++++-+5:files
%7C++%7C++6C+++++++++++++++++++++++++++++++++++++++;+++++-+LIST+(l)
%7C++%7C++%7C++64++++++++++++++++++++++++++++++++++++;++++++++-+DICTIONARY+(d)
%7C++%7C++%7C++%7C++36+3A+6C+65+6E+67+74+68++++++++++++;+++++++++++-+6:length
%7C++%7C++%7C++%7C++69+36+31+35+65+++++++++++++++++++++;+++++++++++-+i615e
%7C++%7C++%7C++%7C++34+3A+70+61+74+68++++++++++++++++++;+++++++++++-+4:path
%7C++%7C++%7C++%7C++6C+++++++++++++++++++++++++++++++++;+++++++++++-+LIST+(l)
%7C++%7C++%7C++%7C++%7C++32+36+3A+66+72+65+65+20+61+75+++;++++++++++++++-+26:free+audiobook+verison.txt
%7C++%7C++%7C++%7C++%7C++64+69+6F+62+6F+6F+6B+20+76+65+++;++++++++++++++++++
%7C++%7C++%7C++%7C++%7C++72+73+69+6F+6E+2E+74+78+74++++++;++++++++++++++++++
%7C++%7C++%7C++%7C++65+++++++++++++++++++++++++++++++++;++++++++++++++-+END+(e)
%7C++%7C++%7C++65++++++++++++++++++++++++++++++++++++;+++++++++++-+END+(e)
%7C++%7C++%7C++64++++++++++++++++++++++++++++++++++++;+++++++++++-+DICTIONARY+(d)
%7C++%7C++%7C++%7C++36+3A+6C+65+6E+67+74+68++++++++++++;++++++++++++++-+6:length
%7C++%7C++%7C++%7C++69+33+39+33+34+31+37+65++++++++++++;++++++++++++++-+i393417e
%7C++%7C++%7C++%7C++34+3A+70+61+74+68++++++++++++++++++;++++++++++++++-+4:path
%7C++%7C++%7C++%7C++6C+++++++++++++++++++++++++++++++++;++++++++++++++-+LIST+(l)
%7C++%7C++%7C++%7C++%7C++36+31+3A+57+61+72+63+72+61+66+++;+++++++++++++++++-+61:Warcraft_+Official+Movie+Novelization+by+Christie+Golden.epub
%7C++%7C++%7C++%7C++%7C++74+5F+20+4F+66+66+69+63+69+61+++;++++++++++++++++++
%7C++%7C++%7C++%7C++%7C++6C+20+4D+6F+76+69+65+20+4E+6F+++;++++++++++++++++++
%7C++%7C++%7C++%7C++%7C++76+65+6C+69+7A+61+74+69+6F+6E+++;++++++++++++++++++
%7C++%7C++%7C++%7C++%7C++20+62+79+20+43+68+72+69+73+74+++;++++++++++++++++++
%7C++%7C++%7C++%7C++%7C++69+65+20+47+6F+6C+64+65+6E+2E+++;++++++++++++++++++
%7C++%7C++%7C++%7C++%7C++65+70+75+62+++++++++++++++++++++;++++++++++++++++++
%7C++%7C++%7C++%7C++65+++++++++++++++++++++++++++++++++;++++++++++++++-+END+(e)
%7C++%7C++%7C++65++++++++++++++++++++++++++++++++++++;+++++++++++-+END+(e)
%7C++%7C++65+++++++++++++++++++++++++++++++++++++++;++++++++-+END+(e)
%7C++%7C++34+3A+6E+61+6D+65++++++++++++++++++++++++;++++++++-+4:name
%7C++%7C++36+31+3A+57+61+72+63+72+61+66++++++++++++;++++++++-+61:Warcraft_+Official+Movie+Novelization+by+Christie+Golden+EPUB+
%7C++%7C++74+5F+20+4F+66+66+69+63+69+61++++++++++++;+++++++++
%7C++%7C++6C+20+4D+6F+76+69+65+20+4E+6F++++++++++++;+++++++++
%7C++%7C++76+65+6C+69+7A+61+74+69+6F+6E++++++++++++;+++++++++
%7C++%7C++20+62+79+20+43+68+72+69+73+74++++++++++++;+++++++++
%7C++%7C++69+65+20+47+6F+6C+64+65+6E+20++++++++++++;+++++++++
%7C++%7C++45+50+55+42++++++++++++++++++++++++++++++;++++++++++
%7C++%7C++31+32+3A+70+69+65+63+65+20+6C++++++++++++;++++++++-+12:piece+length
%7C++%7C++65+6E+67+74+68+++++++++++++++++++++++++++;+++++++++
%7C++%7C++69+31+30+34+38+35+37+36+65+++++++++++++++;++++++++-+i10485765e
%7C++%7C++36+3A+70+69+65+63+65+73++++++++++++++++++;++++++++-+6:pieces
%7C++%7C++32+30+3A+43+92+4C+22+BB+42+9E++++++++++++;++++++++-+20:43+92+4C+22+BB+42+9E+EA+BD+FF+66+C6+79+4C+29+E4+F9+D0+F3+B9+65+65
%7C++%7C++EA+BD+FF+66+C6+79+4C+29+E4+F9++++++++++++;
%7C++%7C++D0+F3+B9+++++++++++++++++++++++++++++++++;
%7C++65++++++++++++++++++++++++++++++++++++++++++;+++++-+END+(e)
65+++++++++++++++++++++++++++++++++++++++++++++;++-+END+(e)|418550|或者，在伪善中：|418551|{
+++info:+{
++++++files:+[
+++++++++{+length:+615,++++path:+["free+audiobook+verison.txt"]+},
+++++++++{+length:+393417,+path:+["Warcraft_+Official+Movie+Novelization+by+Christie+Golden.epub"]+}
++++++],
++++++name:+++++++++++"Warcraft_+Official+Movie+Novelization+by+Christie+Golden+EPUB",
++++++"piece+length":+10485765,
++++++pieces:+++++++++43+92+4C+22+BB+42+9E+EA+BD+FF+66+C6+79+4C+29+E4+F9+D0+F3+B9+65+65
+++}
}|418552|InfoHash是信息的散列|418553|InfoHash是info字典内容的SHA-1散列。|BOLD|418554|我们希望获取info字典键的值的SHA-1哈希：|418555|64++++++++++++++++++++++++++++++++++++++++++;++-+DICTIONARY+(d)
%7C++35+3A+66+69+6C+65+73+++++++++++++++++++++;+++++-+5:files
%7C++6C+++++++++++++++++++++++++++++++++++++++;+++++-+LIST+(l)
%7C++%7C++64++++++++++++++++++++++++++++++++++++;++++++++-+DICTIONARY+(d)
%7C++%7C++%7C++36+3A+6C+65+6E+67+74+68++++++++++++;+++++++++++-+6:length
%7C++%7C++%7C++69+36+31+35+65+++++++++++++++++++++;+++++++++++-+i615e
%7C++%7C++%7C++34+3A+70+61+74+68++++++++++++++++++;+++++++++++-+4:path
%7C++%7C++%7C++6C+++++++++++++++++++++++++++++++++;+++++++++++-+LIST+(l)
%7C++%7C++%7C++%7C++32+36+3A+66+72+65+65+20+61+75+++;++++++++++++++-+26:free+audiobook+verison.txt
%7C++%7C++%7C++%7C++64+69+6F+62+6F+6F+6B+20+76+65+++;++++++++++++++++++
%7C++%7C++%7C++%7C++72+73+69+6F+6E+2E+74+78+74++++++;++++++++++++++++++
%7C++%7C++%7C++65+++++++++++++++++++++++++++++++++;++++++++++++++-+END+(e)
%7C++%7C++65++++++++++++++++++++++++++++++++++++;+++++++++++-+END+(e)
%7C++%7C++64++++++++++++++++++++++++++++++++++++;+++++++++++-+DICTIONARY+(d)
%7C++%7C++%7C++36+3A+6C+65+6E+67+74+68++++++++++++;++++++++++++++-+6:length
%7C++%7C++%7C++69+33+39+33+34+31+37+65++++++++++++;++++++++++++++-+i393417e
%7C++%7C++%7C++34+3A+70+61+74+68++++++++++++++++++;++++++++++++++-+4:path
%7C++%7C++%7C++6C+++++++++++++++++++++++++++++++++;++++++++++++++-+LIST+(l)
%7C++%7C++%7C++%7C++36+31+3A+57+61+72+63+72+61+66+++;+++++++++++++++++-+61:Warcraft_+Official+Movie+Novelization+by+Christie+Golden.epub
%7C++%7C++%7C++%7C++74+5F+20+4F+66+66+69+63+69+61+++;++++++++++++++++++
%7C++%7C++%7C++%7C++6C+20+4D+6F+76+69+65+20+4E+6F+++;++++++++++++++++++
%7C++%7C++%7C++%7C++76+65+6C+69+7A+61+74+69+6F+6E+++;++++++++++++++++++
%7C++%7C++%7C++%7C++20+62+79+20+43+68+72+69+73+74+++;++++++++++++++++++
%7C++%7C++%7C++%7C++69+65+20+47+6F+6C+64+65+6E+2E+++;++++++++++++++++++
%7C++%7C++%7C++%7C++65+70+75+62+++++++++++++++++++++;++++++++++++++++++
%7C++%7C++%7C++65+++++++++++++++++++++++++++++++++;++++++++++++++-+END+(e)
%7C++%7C++65++++++++++++++++++++++++++++++++++++;+++++++++++-+END+(e)
%7C++65+++++++++++++++++++++++++++++++++++++++;++++++++-+END+(e)
%7C++34+3A+6E+61+6D+65++++++++++++++++++++++++;++++++++-+4:name
%7C++36+31+3A+57+61+72+63+72+61+66++++++++++++;++++++++-+61:Warcraft_+Official+Movie+Novelization+by+Christie+Golden+EPUB+
%7C++74+5F+20+4F+66+66+69+63+69+61++++++++++++;+++++++++
%7C++6C+20+4D+6F+76+69+65+20+4E+6F++++++++++++;+++++++++
%7C++76+65+6C+69+7A+61+74+69+6F+6E++++++++++++;+++++++++
%7C++20+62+79+20+43+68+72+69+73+74++++++++++++;+++++++++
%7C++69+65+20+47+6F+6C+64+65+6E+20++++++++++++;+++++++++
%7C++45+50+55+42++++++++++++++++++++++++++++++;++++++++++
%7C++31+32+3A+70+69+65+63+65+20+6C++++++++++++;++++++++-+12:piece+length
%7C++65+6E+67+74+68+++++++++++++++++++++++++++;+++++++++
%7C++69+31+30+34+38+35+37+36+65+++++++++++++++;++++++++-+i10485765e
%7C++36+3A+70+69+65+63+65+73++++++++++++++++++;++++++++-+6:pieces
%7C++32+30+3A+43+92+4C+22+BB+42+9E++++++++++++;++++++++-+20:43+92+4C+22+BB+42+9E+EA+BD+FF+66+C6+79+4C+29+E4+F9+D0+F3+B9+65+65
%7C++EA+BD+FF+66+C6+79+4C+29+E4+F9++++++++++++;
%7C++D0+F3+B9+++++++++++++++++++++++++++++++++;
65++++++++++++++++++++++++++++++++++++++++++;+++++-+END+(e)|418556|我们一起运行所有这些字节：|418557|64+35+3A+66+69+6C+65+73+6C+64+36+3A+6C+65+6E+67+74+68+69+36+31+35+65+34+
3A+70+61+74+68+6C+32+36+3A+66+72+65+65+20+61+75+64+69+6F+62+6F+6F+6B+20+
76+65+72+73+69+6F+6E+2E+74+78+74+65+65+64+36+3A+6C+65+6E+67+74+68+69+33+
39+33+34+31+37+65+34+3A+70+61+74+68+6C+36+31+3A+57+61+72+63+72+61+66+74+
5F+20+4F+66+66+69+63+69+61+6C+20+4D+6F+76+69+65+20+4E+6F+76+65+6C+69+7A+
61+74+69+6F+6E+20+62+79+20+43+68+72+69+73+74+69+65+20+47+6F+6C+64+65+6E+
2E+65+70+75+62+65+65+65+34+3A+6E+61+6D+65+36+31+3A+57+61+72+63+72+61+66+
74+5F+20+4F+66+66+69+63+69+61+6C+20+4D+6F+76+69+65+20+4E+6F+76+65+6C+69+
7A+61+74+69+6F+6E+20+62+79+20+43+68+72+69+73+74+69+65+20+47+6F+6C+64+65+
6E+20+45+50+55+42+31+32+3A+70+69+65+63+65+20+6C+65+6E+67+74+68+69+31+30+
34+38+35+37+36+65+36+3A+70+69+65+63+65+73+32+30+3A+43+92+4C+22+BB+42+9E+
EA+BD+FF+66+C6+79+4C+29+E4+F9+D0+F3+B9+65|418558|然后使用SHA-1哈希生成一个160位(20字节)摘要：|418559|7EDA978ED7628595BB91C48B947F025BAE78CB77|418560|这是正确的答案：|418561|​|418562|📷|atomic|418563|418564|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/2c2f3827fd5419b6000418ae2d5abba8.png|imageAlt^0|0|C|8|0|0|0|0|0|0|0|0|8|9|4|0|6|4|6|4|0|0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|1S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1T|8|@$D|1U|E|1V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|1W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1X|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|1Y|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|S|3|T|5|J|7|20|8|@]|9|@]|A|$K|L]]|$1|U|3|V|5|6|7|21|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|22|8|@$D|23|E|24|F|Y]|$D|25|E|26|F|Y]]|9|@]|A|$]]|$1|Z|3|10|5|6|7|27|8|@$D|28|E|29|F|Y]|$D|2A|E|2B|F|G]]|9|@]|A|$]]|$1|11|3|12|5|J|7|2C|8|@]|9|@]|A|$K|L]]|$1|13|3|14|5|6|7|2D|8|@]|9|@]|A|$]]|$1|15|3|16|5|J|7|2E|8|@]|9|@]|A|$K|L]]|$1|17|3|18|5|6|7|2F|8|@]|9|@]|A|$]]|$1|19|3|1A|5|J|7|2G|8|@]|9|@]|A|$K|L]]|$1|1B|3|1C|5|6|7|2H|8|@]|9|@]|A|$]]|$1|1D|3|1E|5|6|7|2I|8|@]|9|@]|A|$]]|$1|1F|3|1G|5|1H|7|2J|8|@]|9|@$D|2K|E|2L|1|2M]]|A|$]]|$1|1I|3|1E|5|6|7|2N|8|@]|9|@]|A|$]]|$1|1J|3|-4|5|6|7|2O|8|@]|9|@]|A|$]]]|1K|$1L|$5|1M|1N|1O|A|$1P|1Q|1R|-4]]]]

I wanted to add another example, slightly more concrete. 

We start with one of the smallest <code>.torrent</code> files i have:

<pre><code>64 34 3A 69 6E 66 6F 64 35 3A 66 69 6C 65 73 6C 64 36 3A 6C 65 6E 67 74 
68 69 36 31 35 65 34 3A 70 61 74 68 6C 32 36 3A 66 72 65 65 20 61 75 64 
69 6F 62 6F 6F 6B 20 76 65 72 73 69 6F 6E 2E 74 78 74 65 65 64 36 3A 6C 
65 6E 67 74 68 69 33 39 33 34 31 37 65 34 3A 70 61 74 68 6C 36 31 3A 57 
61 72 63 72 61 66 74 5F 20 4F 66 66 69 63 69 61 6C 20 4D 6F 76 69 65 20 
4E 6F 76 65 6C 69 7A 61 74 69 6F 6E 20 62 79 20 43 68 72 69 73 74 69 65 
20 47 6F 6C 64 65 6E 2E 65 70 75 62 65 65 65 34 3A 6E 61 6D 65 36 31 3A 
57 61 72 63 72 61 66 74 5F 20 4F 66 66 69 63 69 61 6C 20 4D 6F 76 69 65 
20 4E 6F 76 65 6C 69 7A 61 74 69 6F 6E 20 62 79 20 43 68 72 69 73 74 69 
65 20 47 6F 6C 64 65 6E 20 45 50 55 42 31 32 3A 70 69 65 63 65 20 6C 65 
6E 67 74 68 69 31 30 34 38 35 37 36 65 36 3A 70 69 65 63 65 73 32 30 3A 
43 92 4C 22 BB 42 9E EA BD FF 66 C6 79 4C 29 E4 F9 D0 F3 B9 65 65
</code></pre>

If we decode the BEncoding:

<pre><code>64 ; DICTIONARY (d)
| 34 3A 69 6E 66 6F ; - 4:info
| 64 ; - DICTIONARY (d)
| | 35 3A 66 69 6C 65 73 ; - 5:files
| | 6C ; - LIST (l)
| | | 64 ; - DICTIONARY (d)
| | | | 36 3A 6C 65 6E 67 74 68 ; - 6:length
| | | | 69 36 31 35 65 ; - i615e
| | | | 34 3A 70 61 74 68 ; - 4:path
| | | | 6C ; - LIST (l)
| | | | | 32 36 3A 66 72 65 65 20 61 75 ; - 26:free audiobook verison.txt
| | | | | 64 69 6F 62 6F 6F 6B 20 76 65 ; 
| | | | | 72 73 69 6F 6E 2E 74 78 74 ; 
| | | | 65 ; - END (e)
| | | 65 ; - END (e)
| | | 64 ; - DICTIONARY (d)
| | | | 36 3A 6C 65 6E 67 74 68 ; - 6:length
| | | | 69 33 39 33 34 31 37 65 ; - i393417e
| | | | 34 3A 70 61 74 68 ; - 4:path
| | | | 6C ; - LIST (l)
| | | | | 36 31 3A 57 61 72 63 72 61 66 ; - 61:Warcraft_ Official Movie Novelization by Christie Golden.epub
| | | | | 74 5F 20 4F 66 66 69 63 69 61 ; 
| | | | | 6C 20 4D 6F 76 69 65 20 4E 6F ; 
| | | | | 76 65 6C 69 7A 61 74 69 6F 6E ; 
| | | | | 20 62 79 20 43 68 72 69 73 74 ; 
| | | | | 69 65 20 47 6F 6C 64 65 6E 2E ; 
| | | | | 65 70 75 62 ; 
| | | | 65 ; - END (e)
| | | 65 ; - END (e)
| | 65 ; - END (e)
| | 34 3A 6E 61 6D 65 ; - 4:name
| | 36 31 3A 57 61 72 63 72 61 66 ; - 61:Warcraft_ Official Movie Novelization by Christie Golden EPUB 
| | 74 5F 20 4F 66 66 69 63 69 61 ; 
| | 6C 20 4D 6F 76 69 65 20 4E 6F ; 
| | 76 65 6C 69 7A 61 74 69 6F 6E ; 
| | 20 62 79 20 43 68 72 69 73 74 ; 
| | 69 65 20 47 6F 6C 64 65 6E 20 ; 
| | 45 50 55 42 ; 
| | 31 32 3A 70 69 65 63 65 20 6C ; - 12:piece length
| | 65 6E 67 74 68 ; 
| | 69 31 30 34 38 35 37 36 65 ; - i10485765e
| | 36 3A 70 69 65 63 65 73 ; - 6:pieces
| | 32 30 3A 43 92 4C 22 BB 42 9E ; - 20:43 92 4C 22 BB 42 9E EA BD FF 66 C6 79 4C 29 E4 F9 D0 F3 B9 65 65
| | EA BD FF 66 C6 79 4C 29 E4 F9 ;
| | D0 F3 B9 ;
| 65 ; - END (e)
65 ; - END (e)
</code></pre>

Or, in pseudo-json:

<pre><code>{
 info: {
 files: [
 { length: 615, path: ["free audiobook verison.txt"] },
 { length: 393417, path: ["Warcraft_ Official Movie Novelization by Christie Golden.epub"] }
 ],
 name: "Warcraft_ Official Movie Novelization by Christie Golden EPUB",
 "piece length": 10485765,
 pieces: 43 92 4C 22 BB 42 9E EA BD FF 66 C6 79 4C 29 E4 F9 D0 F3 B9 65 65
 }
}
</code></pre>

<h2>InfoHash is hash of the info</h2>

The InfoHash is the SHA-1 hash of the info dictionary contents.

We want to take the SHA-1 hash of value of the <code>info</code> dictionary key:

<pre><code>64 ; - DICTIONARY (d)
| 35 3A 66 69 6C 65 73 ; - 5:files
| 6C ; - LIST (l)
| | 64 ; - DICTIONARY (d)
| | | 36 3A 6C 65 6E 67 74 68 ; - 6:length
| | | 69 36 31 35 65 ; - i615e
| | | 34 3A 70 61 74 68 ; - 4:path
| | | 6C ; - LIST (l)
| | | | 32 36 3A 66 72 65 65 20 61 75 ; - 26:free audiobook verison.txt
| | | | 64 69 6F 62 6F 6F 6B 20 76 65 ; 
| | | | 72 73 69 6F 6E 2E 74 78 74 ; 
| | | 65 ; - END (e)
| | 65 ; - END (e)
| | 64 ; - DICTIONARY (d)
| | | 36 3A 6C 65 6E 67 74 68 ; - 6:length
| | | 69 33 39 33 34 31 37 65 ; - i393417e
| | | 34 3A 70 61 74 68 ; - 4:path
| | | 6C ; - LIST (l)
| | | | 36 31 3A 57 61 72 63 72 61 66 ; - 61:Warcraft_ Official Movie Novelization by Christie Golden.epub
| | | | 74 5F 20 4F 66 66 69 63 69 61 ; 
| | | | 6C 20 4D 6F 76 69 65 20 4E 6F ; 
| | | | 76 65 6C 69 7A 61 74 69 6F 6E ; 
| | | | 20 62 79 20 43 68 72 69 73 74 ; 
| | | | 69 65 20 47 6F 6C 64 65 6E 2E ; 
| | | | 65 70 75 62 ; 
| | | 65 ; - END (e)
| | 65 ; - END (e)
| 65 ; - END (e)
| 34 3A 6E 61 6D 65 ; - 4:name
| 36 31 3A 57 61 72 63 72 61 66 ; - 61:Warcraft_ Official Movie Novelization by Christie Golden EPUB 
| 74 5F 20 4F 66 66 69 63 69 61 ; 
| 6C 20 4D 6F 76 69 65 20 4E 6F ; 
| 76 65 6C 69 7A 61 74 69 6F 6E ; 
| 20 62 79 20 43 68 72 69 73 74 ; 
| 69 65 20 47 6F 6C 64 65 6E 20 ; 
| 45 50 55 42 ; 
| 31 32 3A 70 69 65 63 65 20 6C ; - 12:piece length
| 65 6E 67 74 68 ; 
| 69 31 30 34 38 35 37 36 65 ; - i10485765e
| 36 3A 70 69 65 63 65 73 ; - 6:pieces
| 32 30 3A 43 92 4C 22 BB 42 9E ; - 20:43 92 4C 22 BB 42 9E EA BD FF 66 C6 79 4C 29 E4 F9 D0 F3 B9 65 65
| EA BD FF 66 C6 79 4C 29 E4 F9 ;
| D0 F3 B9 ;
65 ; - END (e)
</code></pre>

We run all these bytes together:

<pre><code>64 35 3A 66 69 6C 65 73 6C 64 36 3A 6C 65 6E 67 74 68 69 36 31 35 65 34 
3A 70 61 74 68 6C 32 36 3A 66 72 65 65 20 61 75 64 69 6F 62 6F 6F 6B 20 
76 65 72 73 69 6F 6E 2E 74 78 74 65 65 64 36 3A 6C 65 6E 67 74 68 69 33 
39 33 34 31 37 65 34 3A 70 61 74 68 6C 36 31 3A 57 61 72 63 72 61 66 74 
5F 20 4F 66 66 69 63 69 61 6C 20 4D 6F 76 69 65 20 4E 6F 76 65 6C 69 7A 
61 74 69 6F 6E 20 62 79 20 43 68 72 69 73 74 69 65 20 47 6F 6C 64 65 6E 
2E 65 70 75 62 65 65 65 34 3A 6E 61 6D 65 36 31 3A 57 61 72 63 72 61 66 
74 5F 20 4F 66 66 69 63 69 61 6C 20 4D 6F 76 69 65 20 4E 6F 76 65 6C 69 
7A 61 74 69 6F 6E 20 62 79 20 43 68 72 69 73 74 69 65 20 47 6F 6C 64 65 
6E 20 45 50 55 42 31 32 3A 70 69 65 63 65 20 6C 65 6E 67 74 68 69 31 30 
34 38 35 37 36 65 36 3A 70 69 65 63 65 73 32 30 3A 43 92 4C 22 BB 42 9E 
EA BD FF 66 C6 79 4C 29 E4 F9 D0 F3 B9 65
</code></pre>

And then take the SHA-1 hash to generate a 160-bit (20-byte) digest:

<pre><code>7EDA978ED7628595BB91C48B947F025BAE78CB77
</code></pre>

Which is the right answer:

<a href="https://i.stack.imgur.com/cMuze.png" rel="noreferrer"><img src="https://i.stack.imgur.com/cMuze.png" alt="enter image description here"></a>

I am reading lately a lot about hash from torrents, and magnetic links, etc. But there is a question I don't understand.

I have:

<ul>
<li>hash of a file</li>
<li>and the infohash of a torrent</li>
</ul>

Is the <code>infohash</code> = hash of the file ?

If yes what if the torrent describes 6 Files to download?

If no what does it stand for?

What exactly is the info_Hash in a torrent file

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我最近读了很多关于洪流、磁链接等的杂凑，但是有一个问题我不明白。我有：文件的散列和洪流的信息散列文件的infohash =散列吗？如果是的话，如果洪流描述了要下载的6个文件，怎么办？如果不是，它代表什么？

问洪流文件中的info_Hash究竟是什么？
EN

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问洪流文件中的info_Hash究竟是什么？EN

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问洪流文件中的info_Hash究竟是什么？
EN