1Crypt::CipherSaber(3) User Contributed Perl DocumentationCrypt::CipherSaber(3)
2
3
4

NAME

6       Crypt::CipherSaber - Perl module implementing CipherSaber encryption.
7

SYNOPSIS

9         use Crypt::CipherSaber;
10         my $cs = Crypt::CipherSaber->new('my sad secret key');
11
12         my $coded   = $cs->encrypt('Here is a secret message for you');
13         my $decoded = $cs->decrypt($coded);
14
15         # encrypt from and to a file
16         open my $in,       'secretletter.txt' or die "Can't open infile: $!";
17         open my $out, '>', 'secretletter.cs1' or die "Can't open outfile: $!";
18         binmode $in;
19         binmode $out;
20
21         $cs->fh_crypt($in, $out, 1);
22
23         # decrypt from and to a file
24         open my $in,       'secretletter.txt' or die "Can't open infile: $!";
25         open my $out, '>', 'secretletter.cs1' or die "Can't open outfile: $!";
26
27         binmode $in;
28         binmode $out;
29         $cs->fh_crypt($in, $out);
30

DESCRIPTION

32       The Crypt::CipherSaber module implements CipherSaber encryption,
33       described at <http://ciphersaber.gurus.com/>.  It is simple, fairly
34       speedy, and relatively secure algorithm based on RC4. Relatively, given
35       RC4.
36
37       Encryption and decryption are done based on a secret key, which must be
38       shared with all intended recipients of a message.
39

METHODS

41       new($key, $N)
42           Initialize a new Crypt::CipherSaber object.  $key is a required
43           parameter: the key used to encrypt or to decrypt messages.  $N is
44           optional.  If provided and greater than one, it causes the object
45           to use CipherSaber-2 encryption (slightly slower but more secure).
46           If not specified, or equal to 1, the module defaults to
47           CipherSaber-1 encryption.  $N must be a positive integer greater
48           than one.
49
50       encrypt($message)
51           Encrypt a message.  This uses the key stored in the current
52           Crypt::CipherSaber object.  It generates a 10-byte random IV
53           (Initialization Vector) automatically, as defined in the RC4
54           specification.  This returns a string containing the encrypted
55           message.
56
57           Note that the encrypted message may contain unprintable characters,
58           as it uses the extended ASCII character set (valid numbers 0
59           through 255).
60
61       decrypt($message)
62           Decrypt a message.  For the curious, the first ten bytes of an
63           encrypted message are the IV, so this must strip it off first.
64           This returns a string containing the decrypted message.
65
66           The decrypted message may also contain unprintable characters, as
67           the CipherSaber encryption scheme handles binary filesIf this is
68           important to you, be sure to treat the results correctly.
69
70       crypt($iv, $message)
71           If you wish to generate the IV with a more cryptographically secure
72           random string (at least compared to Perl's builtin "rand()"
73           operator), you may do so separately, passing it to this method
74           directly.  The IV must be a ten-byte string consisting of
75           characters from the extended ASCII set.
76
77           This is generally only useful for encryption, although you may
78           extract the first ten characters of an encrypted message and pass
79           them in yourself.  You might as well call decrypt(), though.  The
80           more random the IV, the stronger the encryption tends to be.  On
81           some operating systems, you can read from /dev/random.  Other
82           approaches are the Math::TrulyRandom module, or compressing a file,
83           removing the headers, and compressing it again.
84
85       fh_crypt( $in_fh, $out_fh, ($iv))
86           For the sake of efficiency, Crypt::CipherSaber can operate on
87           filehandles.  It's not super brilliant, but it's relatively fast
88           and sane.  If your platform needs to use "binmode()", this is your
89           responsibility.  It is also your responsibility to close the files.
90
91           You may also pass in an optional third parameter, an IV.  There are
92           three possibilities here.  If you pass no IV, "fh_crypt()" will
93           pull the first ten bytes from the input filehandle and use that as
94           an IV.  This corresponds to decryption.  If you pass in an IV of
95           your own, it will use that when encrypting the file.  If you pass
96           in the value 1, it will generate a new, random IV for you.  This
97           corresponds to an encryption.
98

100       Copyright (C) 2000 - 2015 chromatic
101
102       This library is free software; you can use, modify, and redistribute it
103       under the same terms as Perl 5.20.x itself.
104

AUTHOR

106       chromatic "chromatic at cpan dot org"
107
108       thanks to jlp for testing, moral support, and never fearing the icky
109       details and to the fine folks at PerlMonks <http://perlmonks.org/>.
110
111       Additional thanks to Olivier Salaun and the Sympa project
112       <http://www.sympa.org> for testing.
113

SEE ALSO

115       the CipherSaber home page at <http://ciphersaber.gurus.com/>
116
117       perl(1), rand().
118
119
120
121perl v5.30.0                      2019-07-26             Crypt::CipherSaber(3)
Impressum