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document the encryption cipher

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Joey Hess 2013-03-03 20:47:36 -04:00
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doc/internals.mdwn
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@ -51,15 +51,23 @@ space and then the description, followed by a timestamp. Example:
If there are multiple lines for the same uuid, the one with the most recent If there are multiple lines for the same uuid, the one with the most recent
timestamp wins. git-annex union merges this and other files. timestamp wins. git-annex union merges this and other files.
## `remotes.log` ## `remote.log`
Holds persistent configuration settings for [[special_remotes]] such as Holds persistent configuration settings for [[special_remotes]] such as
Amazon S3. Amazon S3.
The file format is one line per remote, starting with the uuid of the The file format is one line per remote, starting with the uuid of the
remote, followed by a space, and then a series of key=value pairs, remote, followed by a space, and then a series of var=value pairs,
each separated by whitespace, and finally a timestamp. each separated by whitespace, and finally a timestamp.
Encrypted special remotes store their encryption key here,
in the "cipher" value. It is base64 encoded, and unless shared [[encryption]]
is used, is encrypted to one or more gpg keys. The first 256 bytes of
the cipher is used as the HMAC SHA1 encryption key, to encrypt filenames
stored on the special remote. The remainder of the cipher is used as a gpg
symmetric encryption key, to encrypt the content of files stored on the special
remote.
## `trust.log` ## `trust.log`
Records the [[trust]] information for repositories. Does not exist unless Records the [[trust]] information for repositories. Does not exist unless