Smutty
MVC Framework
View Code: Smutty_GPG
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<?php
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/**
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* this class provides some functions for dealing with the
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* gpg keyring (if there is one).
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*
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* unless otherwise specified, it will create it's own keyring
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* directory in the application folder.
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*
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*/
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class Smutty_GPG extends Smutty_Object {
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/** path to gpg binary */
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private $bin;
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/** command to execute gpg */
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private $gpg;
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/** gpg keyring dir */
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private $homedir;
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/** singleton */
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private static $instance;
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/**
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* constructor. makes sure everything is set up ok. creates
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* the keyring directory if it doesn't exist.
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*
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* @return nothing
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*
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*/
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$this->homedir = $homedir ? $homedir : 'application/data/gpg';
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$this->bin = '/usr/bin/gpg';
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$this->gpg = " $this->bin --homedir " . escapeshellarg($this->homedir) . " 2>&1 ";
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// check required keyring dir exists
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if ( !file_exists($this->homedir) )
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if ( !mkdir($this->homedir) )
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Smutty_Error::fatal( 'cannot create directory data/gpg', 'ClassSmutty_PGP' );
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// check we can write to keyring dir
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if ( !is_writable($this->homedir) )
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Smutty_Error::fatal( 'data/gpg is not writable', 'ClassSmutty_GPG' );
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}
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/**
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* returns the singleton instance of this class
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*
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* @return Smutty_GPG the singleton
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*
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*/
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public static function &getInstance() {
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if ( self::$instance == null )
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self::$instance = new Smutty_GPG();
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return self::$instance;
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}
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/**
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* verifies a signature with the keyring. if the sig is valid
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* then it'll return a Smutty_GPG_ValidSignature object with all
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* the info about the sig. otherwise it'll return false.
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*
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* @param String $sig the signature to verify
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* @return Smutty_GPG_ValidSignature a valid sig object
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*
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*/
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$sig = escapeshellarg( $sig );
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exec( "echo $sig | $this->gpg --verify ", $result );
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// look for success
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foreach ( $result as $line )
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if ( preg_match('/Good signature from "(.*)"/',$line,$matches) )
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return new Smutty_GPG_ValidSignature( $result );
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return false;
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}
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/**
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* imports a public key into the keyring. returns a
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* boolean indicating if it went ok or not.
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*
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* @param String $key the public key to import
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* @return Smutty_GPG_PublicKey the imported key
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*
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*/
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$key = escapeshellarg( $key );
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exec( "echo $key | $this->gpg --import ", $result );
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// check for success
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foreach ( $result as $line )
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if ( preg_match('/key .* [imported|not changed]/',$line) )
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return new Smutty_GPG_PublicKey( $result );
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return false;
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}
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/**
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* lists the keys in the keyring. returns an array
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* of Smutty_GPG_Key objects.
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*
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* @return array Smutty_GPG_Key's
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*
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*/
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$keys = array();
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exec( " $this->gpg --list-keys ", $result );
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// remove info lines
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while ( $line = array_shift($result) )
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if ( preg_match('/^-----/',$line) )
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break;
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while ( $result ) {
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$pub = substr( array_shift($result), 6 );
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$uid = substr( array_shift($result), 6 );
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$sub = substr( array_shift($result), 6 );
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array_shift( $result ); // blank line
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array_push( $keys, new Smutty_GPG_Key(
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$pub, $uid, $sub
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));
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}
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return $keys;
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}
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}
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?>
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