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updated for version 7.4.399

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Problem:    Encryption implementation is messy.  Blowfish encryption has a
            weakness.
Solution:   Refactor the encryption, store the state in an allocated struct
            instead of using a save/restore mechanism.  Introduce the
            "blowfish2" method, which does not have the weakness and encrypts
            the whole undo file. (largely by David Leadbeater)
This commit is contained in:
Bram Moolenaar
2014-08-10 13:38:34 +02:00
parent 0106b4b891
commit 8f4ac01544
27 changed files with 1783 additions and 980 deletions
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16
runtime/doc/options.txt
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@ -2229,10 +2229,18 @@ A jump table for the options with a short description can be found at |Q_op|.
zip PkZip compatible method. A weak kind of encryption.
Backwards compatible with Vim 7.2 and older.
*blowfish*
blowfish Blowfish method. Strong encryption. Requires Vim 7.3
or later, files can NOT be read by Vim 7.2 and older.
This adds a "seed" to the file, every time you write
the file the encrypted bytes will be different.
blowfish Blowfish method. Medium strong encryption but it has
an implementation flaw. Requires Vim 7.3 or later,
files can NOT be read by Vim 7.2 and older. This adds
a "seed" to the file, every time you write the file
the encrypted bytes will be different.
*blowfish2*
blowfish2 Blowfish method. Medium strong encryption. Requires
Vim 7.4.399 or later, files can NOT be read by Vim 7.3
and older. This adds a "seed" to the file, every time
you write the file the encrypted bytes will be
different. The whole undo file is encrypted, not just
the pieces of text.
When reading an encrypted file 'cryptmethod' will be set automatically
to the detected method of the file being read. Thus if you write it