How to decrypt a file in UNIX?

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crypt::des_ede3

Crypt::DES_EDE3(3pm)					User Contributed Perl Documentation				      Crypt::DES_EDE3(3pm)

NAME

       Crypt::DES_EDE3 - Triple-DES EDE encryption/decryption

SYNOPSIS

	   use Crypt::DES_EDE3;
	   my $ede3 = Crypt::DES_EDE3->new($key);
	   $ede3->encrypt($block);

DESCRIPTION

       Crypt::DES_EDE3 implements DES-EDE3 encryption. This is triple-DES encryption where an encrypt operation is encrypt-decrypt-encrypt, and
       decrypt is decrypt-encrypt-decrypt. This implementation uses Crypt::DES to do its dirty DES work, and simply provides a wrapper around that
       module: setting up the individual DES ciphers, initializing the keys, and performing the encryption/decryption steps.

       DES-EDE3 encryption requires a key size of 24 bytes.

       You're probably best off not using this module directly, as the encrypt and decrypt methods expect 8-octet blocks. You might want to use
       the module in conjunction with Crypt::CBC, for example. This would be DES-EDE3-CBC, or triple-DES in outer CBC mode.

USAGE

       $ede3 = Crypt::DES_EDE3->new($key)

       Creates a new Crypt::DES_EDE3 object (really, a collection of three DES ciphers), and initializes each cipher with part of $key, which
       should be at least 24 bytes. If it's longer than 24 bytes, the extra bytes will be ignored.

       Returns the new object.

       $ede3->encrypt($block)

       Encrypts an 8-byte block of data $block using the three DES ciphers in an encrypt-decrypt-encrypt operation.

       Returns the encrypted block.

       $ede3->decrypt($block)

       Decrypts an 8-byte block of data $block using the three DES ciphers in a decrypt-encrypt-decrypt operation.

       Returns the decrypted block.

       $ede3->blocksize

       Returns the block size(8).

       $ede3->keysize

       Returns the key size(24).

LICENSE

       Crypt::DES_EDE3 is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR &; COPYRIGHTS
       Crypt::DES_EDE3 is Copyright 2001 Benjamin Trott, ben@rhumba.pair.com. All rights reserved.

perl v5.8.8							    2001-09-15						      Crypt::DES_EDE3(3pm)

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