Manual Reference Pages - NET::SSH::PERL::CIPHER::BLOWFISH (3)
Net::SSH::Perl::Cipher::Blowfish - Wrapper for SSH Blowfish support
my $cipher = Net::SSH::Perl::Cipher->new(Blowfish, $key);
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 its 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, youll 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
AUTHOR & COPYRIGHTS
Please see the Net::SSH::Perl manpage for author, copyright,
and license information.
|perl v5.20.3 ||NET::SSH::PERL::CIPHER::BLOWFISH (3) ||2015-09-12 |
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