1Net::SSH::Perl::Cipher(U3s)er Contributed Perl DocumentatNieotn::SSH::Perl::Cipher(3)
2
3
4

NAME

6       Net::SSH::Perl::Cipher - Base cipher class, plus utility methods
7

SYNOPSIS

9           use Net::SSH::Perl::Cipher;
10
11           # Get list of supported cipher IDs.
12           my $supported = Net::SSH::Perl::Cipher::supported();
13
14           # Translate a cipher name into an ID.
15           my $id = Net::SSH::Perl::Cipher::id($name);
16
17           # Translate a cipher ID into a name.
18           my $name = Net::SSH::Perl::Cipher::name($id);
19

DESCRIPTION

21       Net::SSH::Perl::Cipher provides a base class for each of the encryption
22       cipher classes. In addition, it defines a set of utility methods that
23       can be called either as functions or object methods.
24

UTILITY METHODS

26   supported( [ protocol => $protocol, ] [ $ciph_id [, $server_supports ] ])
27       Without arguments returns a reference to an array of ciphers supported
28       by Net::SSH::Perl. These are ciphers that have working
29       Net::SSH::Perl::Cipher:: implementations, essentially.  Pass 'protocol
30       => 2' to get a list of SSH2 ciphers.
31
32       With one argument $ciph_id, returns a true value if that cipher is
33       supported by Net::SSH::Perl, and false otherwise.
34
35       With two arguments, $ciph_id and $server_supports, returns true if the
36       cipher represented by $ciph_id is supported both by Net::SSH::Perl and
37       by the sshd server. The list of ciphers supported by the server should
38       be in $server_supports, a bit mask sent from the server during the
39       session identification phase.
40
41       Can be called either as a non-exported function, i.e.
42
43           my $i_support = Net::SSH::Perl::Cipher::supported();
44
45       or as an object method of a Net::SSH::Perl::Cipher object, or an object
46       of a subclass:
47
48           if ($ciph->supported($server_supports)) {
49               print "Server supports cipher $ciph";
50           }
51
52   id( [ $cipher_name ] )
53       Translates a cipher name into a cipher ID.
54
55       If given $cipher_name translates that name into the corresponding ID.
56       If called as an object method, translates the object's cipher class
57       name into the ID.
58
59   name( [ $cipher_id ] )
60       Translates a cipher ID into a cipher name.
61
62       If given $cipher_id translates that ID into the corresponding name. If
63       called as an object method, returns the (stripped) object's cipher
64       class name; for example, if the object were of type
65       Net::SSH::Perl::Cipher::IDEA, name would return IDEA.
66

CIPHER USAGE

68   Net::SSH::Perl::Cipher->new($cipher_name, $key)
69       Instantiates a new cipher object of the type $cipher_name with the key
70       $key; returns the cipher object, which will be blessed into the actual
71       cipher subclass.
72
73       If $cipher_name is the special type 'None' (no encryption cipher), the
74       object will actually be blessed directly into the base class, and text
75       to be encrypted and decrypted will be passed through without change.
76
77   $cipher->encrypt($text)
78       Encrypts $text and returns the encrypted string.
79
80   $cipher->decrypt($text)
81       Decrypts $text and returns the decrypted string.
82

CIPHER DEVELOPMENT

84       Classes implementing an encryption cipher must implement the following
85       three methods:
86
87       ·   $class->new($key)
88
89           Given a key $key, should construct a new cipher object and bless it
90           into $class, presumably.
91
92       ·   $cipher->encrypt($text)
93
94           Given plain text $text, should encrypt the text and return the
95           encrypted string.
96
97       ·   $cipher->decrypt($text)
98
99           Given encrypted text $text, should decrypt the text and return the
100           decrypted string.
101

AUTHOR & COPYRIGHTS

103       Please see the Net::SSH::Perl manpage for author, copyright, and
104       license information.
105
106
107
108perl v5.12.2                      2008-09-24         Net::SSH::Perl::Cipher(3)
Impressum