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.\" ========================================================================
.\"
.IX Title "Crypt::DES_EDE3 3pm"
.TH Crypt::DES_EDE3 3pm "2022-05-28" "perl v5.34.0" "User Contributed Perl Documentation"
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.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Crypt::DES_EDE3 \- Triple\-DES EDE encryption/decryption
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    use Crypt::DES_EDE3;
\&    my $ede3 = Crypt::DES_EDE3\->new($key);
\&    $ede3\->encrypt($block);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fICrypt::DES_EDE3\fR implements \s-1DES\-EDE3\s0 encryption. This is triple-DES
encryption where an encrypt operation is encrypt-decrypt-encrypt, and
decrypt is decrypt-encrypt-decrypt. This implementation uses \fICrypt::DES\fR
to do its dirty \s-1DES\s0 work, and simply provides a wrapper around that
module: setting up the individual \s-1DES\s0 ciphers, initializing the keys,
and performing the encryption/decryption steps.
.PP
\&\s-1DES\-EDE3\s0 encryption requires a key size of 24 bytes.
.PP
You're probably best off not using this module directly, as the \fIencrypt\fR
and \fIdecrypt\fR methods expect 8\-octet blocks. You might want to use the
module in conjunction with \fICrypt::CBC\fR, for example. This would be
\&\s-1DES\-EDE3\-CBC,\s0 or triple-DES in outer \s-1CBC\s0 mode.
.SH "USAGE"
.IX Header "USAGE"
.ie n .SS "$ede3 = Crypt::DES_EDE3\->new($key)"
.el .SS "\f(CW$ede3\fP = Crypt::DES_EDE3\->new($key)"
.IX Subsection "$ede3 = Crypt::DES_EDE3->new($key)"
Creates a new \fICrypt::DES_EDE3\fR object (really, a collection of three \s-1DES\s0
ciphers), and initializes each cipher with part of \fI\f(CI$key\fI\fR, which should be
at least 24 bytes. If it's longer than 24 bytes, the extra bytes will be
ignored.
.PP
Returns the new object.
.ie n .SS "$ede3\->encrypt($block)"
.el .SS "\f(CW$ede3\fP\->encrypt($block)"
.IX Subsection "$ede3->encrypt($block)"
Encrypts an 8\-byte block of data \fI\f(CI$block\fI\fR using the three \s-1DES\s0 ciphers in
an encrypt-decrypt-encrypt operation.
.PP
Returns the encrypted block.
.ie n .SS "$ede3\->decrypt($block)"
.el .SS "\f(CW$ede3\fP\->decrypt($block)"
.IX Subsection "$ede3->decrypt($block)"
Decrypts an 8\-byte block of data \fI\f(CI$block\fI\fR using the three \s-1DES\s0 ciphers in
a decrypt-encrypt-decrypt operation.
.PP
Returns the decrypted block.
.ie n .SS "$ede3\->blocksize"
.el .SS "\f(CW$ede3\fP\->blocksize"
.IX Subsection "$ede3->blocksize"
Returns the block size (8).
.ie n .SS "$ede3\->keysize"
.el .SS "\f(CW$ede3\fP\->keysize"
.IX Subsection "$ede3->keysize"
Returns the key size (24).
.SH "LICENSE"
.IX Header "LICENSE"
Crypt::DES_EDE3 is free software; you may redistribute it and/or modify
it under the same terms as Perl itself.
.SH "AUTHOR & COPYRIGHTS"
.IX Header "AUTHOR & COPYRIGHTS"
Crypt::DES_EDE3 is Copyright 2001 Benjamin Trott, ben@rhumba.pair.com. All
rights reserved.