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.\" ========================================================================
.\"
.IX Title "Crypt::Cipher::Twofish 3"
.TH Crypt::Cipher::Twofish 3 "2022-01-07" "perl v5.26.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Crypt::Cipher::Twofish \- Symmetric cipher Twofish, key size: 128/192/256 bits
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  ### example 1
\&  use Crypt::Mode::CBC;
\&
\&  my $key = \*(Aq...\*(Aq; # length has to be valid key size for this cipher
\&  my $iv = \*(Aq...\*(Aq;  # 16 bytes
\&  my $cbc = Crypt::Mode::CBC\->new(\*(AqTwofish\*(Aq);
\&  my $ciphertext = $cbc\->encrypt("secret data", $key, $iv);
\&
\&  ### example 2 (slower)
\&  use Crypt::CBC;
\&  use Crypt::Cipher::Twofish;
\&
\&  my $key = \*(Aq...\*(Aq; # length has to be valid key size for this cipher
\&  my $iv = \*(Aq...\*(Aq;  # 16 bytes
\&  my $cbc = Crypt::CBC\->new( \-cipher=>\*(AqCipher::Twofish\*(Aq, \-key=>$key, \-iv=>$iv );
\&  my $ciphertext = $cbc\->encrypt("secret data");
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module implements the Twofish cipher. Provided interface is compliant with Crypt::CBC module.
.PP
\&\fB\s-1BEWARE:\s0\fR This module implements just elementary \*(L"one\-block\-(en|de)cryption\*(R" operation \- if you want to
encrypt/decrypt generic data you have to use some of the cipher block modes \- check for example
Crypt::Mode::CBC, Crypt::Mode::CTR or Crypt::CBC (which will be slower).
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
.Vb 3
\& $c = Crypt::Cipher::Twofish\->new($key);
\& #or
\& $c = Crypt::Cipher::Twofish\->new($key, $rounds);
.Ve
.SS "encrypt"
.IX Subsection "encrypt"
.Vb 1
\& $ciphertext = $c\->encrypt($plaintext);
.Ve
.SS "decrypt"
.IX Subsection "decrypt"
.Vb 1
\& $plaintext = $c\->decrypt($ciphertext);
.Ve
.SS "keysize"
.IX Subsection "keysize"
.Vb 5
\&  $c\->keysize;
\&  #or
\&  Crypt::Cipher::Twofish\->keysize;
\&  #or
\&  Crypt::Cipher::Twofish::keysize;
.Ve
.SS "blocksize"
.IX Subsection "blocksize"
.Vb 5
\&  $c\->blocksize;
\&  #or
\&  Crypt::Cipher::Twofish\->blocksize;
\&  #or
\&  Crypt::Cipher::Twofish::blocksize;
.Ve
.SS "max_keysize"
.IX Subsection "max_keysize"
.Vb 5
\&  $c\->max_keysize;
\&  #or
\&  Crypt::Cipher::Twofish\->max_keysize;
\&  #or
\&  Crypt::Cipher::Twofish::max_keysize;
.Ve
.SS "min_keysize"
.IX Subsection "min_keysize"
.Vb 5
\&  $c\->min_keysize;
\&  #or
\&  Crypt::Cipher::Twofish\->min_keysize;
\&  #or
\&  Crypt::Cipher::Twofish::min_keysize;
.Ve
.SS "default_rounds"
.IX Subsection "default_rounds"
.Vb 5
\&  $c\->default_rounds;
\&  #or
\&  Crypt::Cipher::Twofish\->default_rounds;
\&  #or
\&  Crypt::Cipher::Twofish::default_rounds;
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
.IP "\(bu" 4
CryptX, Crypt::Cipher
.IP "\(bu" 4
<https://en.wikipedia.org/wiki/Twofish>