LayeredParameterizedPassword.php

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<?php
class LayeredParameterizedPassword extends ParameterizedPassword {
    protected function getDelimiter() {
        return '!';
    }

    protected function getDefaultParams() {
        $params = array();

        foreach ( $this->config['types'] as $type ) {
            $passObj = $this->factory->newFromType( $type );

            if ( !$passObj instanceof ParameterizedPassword ) {
                throw new MWException( 'Underlying type must be a parameterized password.' );
            } elseif ( $passObj->getDelimiter() === $this->getDelimiter() ) {
                throw new MWException( 'Underlying type cannot use same delimiter as encapsulating type.' );
            }

            $params[] = implode( $passObj->getDelimiter(), $passObj->getDefaultParams() );
        }

        return $params;
    }

    public function crypt( $password ) {
        $lastHash = $password;
        foreach ( $this->config['types'] as $i => $type ) {
            // Construct pseudo-hash based on params and arguments
            $passObj = $this->factory->newFromType( $type );

            $params = '';
            $args = '';
            if ( $this->params[$i] !== '' ) {
                $params = $this->params[$i] . $passObj->getDelimiter();
            }
            if ( isset( $this->args[$i] ) && $this->args[$i] !== '' ) {
                $args = $this->args[$i] . $passObj->getDelimiter();
            }
            $existingHash = ":$type:" . $params . $args . $this->hash;

            // Hash the last hash with the next type in the layer
            $passObj = $this->factory->newFromCiphertext( $existingHash );
            $passObj->crypt( $lastHash );

            // Move over the params and args
            $this->params[$i] = implode( $passObj->getDelimiter(), $passObj->params );
            $this->args[$i] = implode( $passObj->getDelimiter(), $passObj->args );
            $lastHash = $passObj->hash;
        }

        $this->hash = $lastHash;
    }

    public function partialCrypt( ParameterizedPassword $passObj ) {
        $type = $passObj->config['type'];
        if ( $type !== $this->config['types'][0] ) {
            throw new MWException( 'Only a hash in the first layer can be finished.' );
        }

        // Gather info from the existing hash
        $this->params[0] = implode( $passObj->getDelimiter(), $passObj->params );
        $this->args[0] = implode( $passObj->getDelimiter(), $passObj->args );
        $lastHash = $passObj->hash;

        // Layer the remaining types
        foreach ( $this->config['types'] as $i => $type ) {
            if ( $i == 0 ) {
                continue;
            };

            // Construct pseudo-hash based on params and arguments
            $passObj = $this->factory->newFromType( $type );

            $params = '';
            $args = '';
            if ( $this->params[$i] !== '' ) {
                $params = $this->params[$i] . $passObj->getDelimiter();
            }
            if ( isset( $this->args[$i] ) && $this->args[$i] !== '' ) {
                $args = $this->args[$i] . $passObj->getDelimiter();
            }
            $existingHash = ":$type:" . $params . $args . $this->hash;

            // Hash the last hash with the next type in the layer
            $passObj = $this->factory->newFromCiphertext( $existingHash );
            $passObj->crypt( $lastHash );

            // Move over the params and args
            $this->params[$i] = implode( $passObj->getDelimiter(), $passObj->params );
            $this->args[$i] = implode( $passObj->getDelimiter(), $passObj->args );
            $lastHash = $passObj->hash;
        }

        $this->hash = $lastHash;
    }
}