Net::SSH::Perl::Cipher::Blowfish(3pm) - phpMan

Net::SSH::Perl::Cipher::BlowfisUsermContributed Perl DocumenNet::SSH::Perl::Cipher::Blowfish(3pm)



NAME
       Net::SSH::Perl::Cipher::Blowfish - Wrapper for SSH Blowfish support

SYNOPSIS
           use Net::SSH::Perl::Cipher;
           my $cipher = Net::SSH::Perl::Cipher->new('Blowfish', $key);
           print $cipher->encrypt($plaintext);

DESCRIPTION
       Net::SSH::Perl::Cipher::Blowfish provides Blowfish encryption support for Net::SSH::Perl.
       To do so it wraps around either Crypt::Blowfish or Crypt::Blowfish_PP; the former is a
       C/XS implementation of the blowfish algorithm, and the latter is a Perl implementation.
       Net::SSH::Perl::Cipher::Blowfish prefers to use Crypt::Blowfish, because it's faster, so
       we try to load that first. If it fails, we fall back to Crypt::Blowfish_PP.  Note that,
       when using Crypt::Blowfish_PP, you'll experience a very noticeable decrease in
       performance.

       The blowfish used here is in CBC filter mode with a key length of 32 bytes.

       SSH1 adds an extra wrinkle with respect to its blowfish algorithm: before and after
       encryption/decryption, we have to swap the bytes in the string to be encrypted/decrypted.
       The byte-swapping is done four bytes at a time, and within each of those four-byte blocks
       we reverse the bytes. So, for example, the string "foobarba" turns into "boofabra". We
       swap the bytes in this manner in the string before we encrypt/decrypt it, and swap the
       encrypted/decrypted string again when we get it back.

       This byte-swapping is not done when Blowfish is used in the SSH2 protocol.

AUTHOR & COPYRIGHTS
       Please see the Net::SSH::Perl manpage for author, copyright, and license information.



perl v5.10.0                                2001-05-07      Net::SSH::Perl::Cipher::Blowfish(3pm)

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