MWOldPassword.php

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<?php
class MWOldPassword extends ParameterizedPassword {
    protected function getDefaultParams() {
        return [];
    }
 
    protected function getDelimiter() {
        return ':';
    }
 
    public function crypt( $plaintext ) {
        if ( count( $this->args ) === 1 ) {
            // Accept (but do not generate) salted passwords with :A: prefix.
            // These are actually B-type passwords, but an error in a previous
            // version of MediaWiki caused them to be written with an :A:
            // prefix.
            $this->hash = md5( $this->args[0] . '-' . md5( $plaintext ) );
        } else {
            $this->args = [];
            $this->hash = md5( $plaintext );
        }
 
        if ( !is_string( $this->hash ) || strlen( $this->hash ) < 32 ) {
            throw new PasswordError( 'Error when hashing password.' );
        }
    }
}