Question

I understand that you must calculate the SHA1 of the info dict in the torrent file, I am struggling Parsing the info dict, Do i Need to decode the bencoded info dict before calculating the sha1 hash??

我如何这样做?

Answer 1

<info hash 是info dictionary in bencoded form.

The torrent file contained a bencoded represent of the meta info dictionary which in another contained the info dictionary.

你们必须获得info dictionary部分文件,以便补充文件内容。假设你能够使用密码,可以:

decode the whole file
take the info dictionary part of it
re-encode it for hashing.

In pseudo Code:

metainfo = b_decode(contents_of("file.torrent"))
info = metainfo.getValue("info")
encoded_info = b_encode(info)
info_hash = sha1(encoded_info)

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