Crypt::GPG

 $Revision: 1.52 $
 $Date: 2005/02/23 09:12:54 $

  use Crypt::GPG;
  my $gpg = new Crypt::GPG;
  $gpg->gpgbin('/usr/bin/gpg');      # The GnuPG executable.
  $gpg->secretkey('0x2B59D29E');     # Set ID of default secret key.
  $gpg->passphrase('just testing');  # Set passphrase.
  # Sign a message:
  my $sign = $gpg->sign('testing again');
  # Encrypt a message:
  my @encrypted = $gpg->encrypt ('top secret', 'test@bar.com');
  # Get message info:
  my @recipients = $gpg->msginfo($encrypted);
  # Decrypt a message.
  my ($plaintext, $signature) = $gpg->verify($encrypted);
  # Key generation:
  $status = $gpg->keygen 
    ('Test', 'test@foo.com', 'ELG-E', 2048, 0, 'test passphrase');
  print while (<$status>); close $status;
  # Key database manipulation:
  $gpg->addkey($key, @ids);
  @keys = $gpg->keydb(@ids);
  # Key manipulation:
  $key = $keys[0];
 
  $gpg->delkey($key);
  $gpg->disablekey($key);
  $gpg->enablekey($key);
  $gpg->keypass($key, $oldpassphrase, $newpassphrase);
  $keystring = $gpg->export($key);

The Crypt::GPG module provides access to the functionality of the GnuPG (www.gnupg.org) encryption tool through an object oriented interface.

It provides methods for encryption, decryption, signing, signature verification, key generation, key certification, export and import. Key-server access is on the todo list.

This release of the module may create compatibility issues with previous versions. If you find any such problems, or any bugs or documentation errors, please do report them to crypt-gpg at neomailbox.com.

new()

Creates and returns a new Crypt::GPG object.

gpgbin($path)

Sets the GPGBIN instance variable which gives the path to the GnuPG binary.

gpgopts($opts)

Sets the GPGOPTS instance variable which may be used to pass additional options to the GnuPG binary. For proper functioning of this module, it is advisable to always include '--lock-multiple' in the GPGOPTS string.

delay($seconds)

Sets the DELAY instance variable. This is no longer necessary (nor used) in the current version of the module, but remains so existing scripts don't break.

secretkey($keyid)

Sets the SECRETKEY instance variable which may be a KeyID or a username. This is the ID of the default key to use for signing.

passphrase($passphrase)

Sets the PASSPHRASE instance variable, required for signing and decryption.

text($boolean)

Sets the TEXT instance variable. If set true, GnuPG will use network-compatible line endings for proper cross-platform compatibility and the plaintext will gain a newline at the end, if it does not already have one.

armor($boolean)

Sets the ARMOR instance variable, controlling the ASCII armoring of output. The default is to use ascii-armoring. The module has not been tested with this option turned off, and most likely will not work if you switch this off.

detach($boolean)

Sets the DETACH instance variable. If set true, the sign method will produce detached signature certificates, else it won't. The default is to produce detached signatures.

encryptsafe($boolean)

Sets the ENCRYPTSAFE instance variable. If set true, encryption will fail if trying to encrypt to a key which is not trusted. This is the default. Turn this off if you want to encrypt to untrusted keys.

debug($boolean)

Sets the DEBUG instance variable which causes the raw output of Crypt::GPG's interaction with the GnuPG binary to be dumped to STDOUT. By default, debugging is off.

sign(@message)

Signs @message with the secret key specified with secretkey() and returns the result as a string.

decrypt(\@message, [\@signature])

This is just an alias for verify()

verify(\@message, [\@signature])

Decrypts and/or verifies the message in @message, optionally using the detached signature in @signature, and returns a list whose first element is plaintext message as a string. If the message was signed, a Crypt::GPG::Signature object is returned as the second element of the list.

The Crypt::GPG::Signature object can be queried with the following methods:

   $sig->validity();    # 'GOOD', 'BAD', or 'UNKNOWN'
   $sig->keyid();       # ID of signing key
   $sig->time();        # Time the signature was made
   $sig->trusted();     # Signature trust level
    

msginfo(@ciphertext)

Returns a list of the recipient key IDs that @ciphertext is encrypted to.

encrypt($plaintext, $keylist, [-sign] )

Encrypts $plaintext with the public keys of the recipients listed in $keylist and returns the result in a string, or undef if there was an error while processing. Returns undef if any of the keys are not found.

Either $plaintext or $keylist may be specified as either an arrayref or a simple scalar.

If $plaintext is a an arrayref, it will be join()ed without newlines.

If you want to encrypt to multiple recipients, you must use the arrayref version of $keylist. A scalar $keylist works for only a single key ID.

If the -sign option is provided, the message will be signed before encryption. The secret key and passphrase must be set for signing to work. They can be set with the secretkey() and passphrase() methods.

addkey($key, $pretend, @keyids)

Adds the keys given in $key to the user's key ring and returns a list of Crypt::GPG::Key objects corresponding to the keys that were added. $key may be a string or an array reference.

If $pretend is true, it pretends to add the key and creates the key object, but doesn't actually perform the key addition.

Optionally, a list of key IDs may be specified. If a list of key IDs is specified, only keys that match those IDs will be imported. The rest will be ignored.

export($key)

Exports the key specified by the Crypt::GPG::Key object $key and returns the result as a string.

keygen($name, $email, $keytype, $keysize, $expire, $passphrase)

Creates a new keypair with the parameters specified. The only supported $keytype currently is 'ELG-E'. $keysize can be any of 1024, 2048, 3072 or 4096. Returns undef if there was an error, otherwise returns a filehandle that reports the progress of the key generation process similar to the way GnuPG does. The key generation is not complete till you read an EOF from the returned filehandle.

certify($keyid, $local, @uids)

Certifies to the authenticity of UIDs of the key with ID $keyid. If $local is true, the certification will be non-exportable. The @uids parameter should contain the list of UIDs to certify (the first UID of a key is 0).

keydb(@keyids)

Returns an array of Crypt::GPG::Key objects corresponding to the Key IDs listed in @keyids. This method used to be called keyinfo and that is still an alias to this method.

parsekeys(@keylist)

Parses a raw GnuPG formatted key listing in @keylist and returns an array of Crypt::GPG::Key objects.

keypass($key, $oldpass, $newpass)

Change the passphrase for a key. Returns true if the passphrase change succeeded, false if not, or undef if there was an error.

delkey($keyid)

Deletes the key specified by the Crypt::GPG::Key object $key from the user's key ring. Returns undef if there was an error, or 1 if the key was successfully deleted.

disablekey($keyid)

Disables the key specified by the Crypt::GPG::Key object $key.

enablekey($keyid)

Enables the key specified by the Crypt::GPG::Key object $key.

  Documentation coming soon.

  Documentation coming soon.

• Key server access.
• More complete key manipulation interface.
• Filehandle interface to handle large messages.

• Error checking needs work.
• Some key manipulation functions are missing.
• The method call interface is subject to change in future versions.
• The current implementation will probably eat up all your RAM if you try to operate on huge messages. In future versions, this will be addressed by reading from and returning filehandles, rather than using in-core data.
• Methods may break if you don't use ASCII armoring.

Crypt::GPG is Copyright (c) 2000-2005 Ashish Gulhati <crypt-gpg at neomailbox.com>. All Rights Reserved.

Thanks to Barkha, my sunshine. And to the GnuPG team and everyone who writes free software.

This code is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

Are very welcome. Email crypt-gpg at neomailbox.com.