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Git-Crypt-0.05
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Git::Crypt

Git::Crypt - Encrypt/decrypt sensitive files saved on public repos

SYNOPSIS

gitcrypt Command line tool

gitcrypt help                    #show gitcrypt help
gitcrypt init                    #initialize gitcrypt and its config
gitcrypt set cipher Blowfish     #set a gitcrypt cipher
gitcrypt set key   "some key"    #set a key
gitcrypt set salt  "some key"    #set a salt
gitcrypt change key "new key"    #change key
gitcrypt change salt "a salt"    #change salt
gitcrypt list                    #list files
gitcrypt status                  #show status, files
gitcrypt add file1-xy lib/file2  #add files in gitcrypt
gitcrypt del file1-ab lib/tests  #del files in gitcrypt
gitcrypt encrypt                 #set files on encrypted state
gitcrypt encrypt file1 file2     #encrypt specific files
gitcrypt decrypt                 #set files on decrypted state
gitcrypt decrypt file1 file2     #decrypt specific files
gitcrypt precommit               #encrypt for precommit hook. Then decrypt

git hooks integration

To integrate in git, use git hooks. Use pre-commit to encrypt and add the encrypted file for commit. And post-commit to keep files decrypted.

Standard git hooks

.git/hooks/pre-commit [with encrypt and decrypt]

Auto encrypt every file and set them for commit. The following script will be called upon 'git commit .' command.

$ file=.git/hooks/pre-commit ; cat <<HOOK > $file && chmod +x $file
#!/usr/bin/env perl
`gitcrypt precommit`;
exit 0;
HOOK

If used gitcrypt precommit the files will be encrypted during commit and decrypted right after.

This mode works good if only some files are encrypted and others are always decrypted. But all must be encrypted for commit.

Another option, is to encrypt everything with "gitcrypt encrypt". And use a post-commit hook to decrypt everything [optional].

.git/hooks/pre-commit [encrypt only]

$ file=.git/hooks/pre-commit ; cat <<HOOK > $file && chmod +x $file
#!/usr/bin/env perl
`gitcrypt encrypt`;
exit 0;
HOOK

.git/hooks/post-commit

Auto decrypt every file after commit executed. * If precommit hook uses gitcrypt precommit, then this is not necessary because "gitcrypt precommit" will decrypt files automatically.

$ file=.git/hooks/post-commit; cat <<HOOK > $file ; chmod +x $file
#!/usr/bin/env perl
`gitcrypt decrypt`;
exit 0;
HOOK

Using Git::Hooks

$ f=.git/hooks/githooks.pl ; cat <<HOOKS > $f; chmod +x $f
#!/usr/bin/env perl
use Git::Hooks;
PRE_COMMIT {
    my ($git) = @_;
    `gitcrypt precommit`;
};
run_hook($0, @ARGV);
HOOKS

$ cd .git/hooks; ln -s githooks.pl pre-commit

Provide the cipher instance

my $gitcrypt = Git::Crypt->new(
    files => [
        {
            file => 'file1',
            is_encrypted => 0,
        },
        {
            file => 'file2',
            is_encrypted => 0,
        },
    ],
    cipher => Crypt::CBC->new(
        -key      => 'a very very very veeeeery very long key',
        -cipher   => 'Blowfish',
        -salt     => pack("H16", "very very very very loooong salt")
    )
);

#gitcrypt->add([qw| file1 file2 |]);
#gitcrypt->del([qw| file1 file2 |]);
#gitcrypt->list;
#gitcrypt->key('some key');
#gitcrypt->salt('some key');
$gitcrypt->crypt;     #save files encrypted
$gitcrypt->decrypt;   #save files decrypted

Provide key, salt and cipher name

my $gitcrypt = Git::Crypt->new(
    files => [
        {
            file => 'file1',
            is_encrypted => 0,
        },
        {
            file => 'file2',
            is_encrypted => 0,
        },
    ],
    key         => 'a very very very veeeeery very long key',
    cipher_name => 'Blowfish',
    salt        => pack("H16", "very very very very loooong salt")
);

#gitcrypt->add([qw| file1 file2 |]);
#gitcrypt->del([qw| file1 file2 |]);
#gitcrypt->list;
#gitcrypt->key('some key');
#gitcrypt->salt('some key');
$gitcrypt->crypt;     #save files encrypted
$gitcrypt->decrypt;   #save files decrypted

DESCRIPTION

Git::Crypt can be used to encrypt files before a git commit. That way its possible to upload encrypted files to public repositories. Git::Crypt encrypts line by line to prevent too many unnecessary diffs between encrypted commits.

Diff on encrypted lines

Since gitcrypt encrypts line by line, the diff can show wether its a big/small changes in commit.

index b1202fc..6c2f3e6 100644
--- a/lib/App/Crypted/CreditCard.pm
+++ b/lib/App/Crypted/CreditCard.pm
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 U2FsdGVkX19iyl3d3d3d3Tz+ZxmSz/rx2ego3EqSeUk=
 U2FsdGVkX19iyl3d3d3d3T3HmAPM6gbK
 U2FsdGVkX19iyl3d3d3d3XVxkdxldN7U
+U2FsdGVkX19iyl3d3d3d3T0XLptL7y1QEx/u7OaQVy2BZbX3SM7f2w==
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+U2FsdGVkX19iyl3d3d3d3XVxkdxldN7U
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AUTHOR

Hernan Lopes
CPAN ID: HERNAN
perldelux
hernanlopes@gmail.com

GITHUB

https://github.com/hernan604/Git-Crypt

COPYRIGHT

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

The full text of the license can be found in the LICENSE file included with this module.

SEE ALSO

perl(1).