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Editing: class-ithemes-credentials.php

<?php

// -----------------------------------------------------------------------------

class iThemes_Credentials {

// -----------------------------------------------------------------------------

protected $hash = 'sha256';

protected $salt_padding = 'wdHVwU&HcYcWnllo%kTUUnxpScy4%ICM29';

protected $iteration_count = 131072;

protected $key_length = 64;

protected $username;

protected $password;

// -----------------------------------------------------------------------------

public function __construct( $username, $password, $options = [] ) {

$this->username = $username;

$this->password = $password;

if ( ! empty( $options['hash'] ) ) {
			$this->hash = strtolower( trim( $options['hash'] ) );
		}

if ( ! empty( $options['iterations'] ) ) {
			$this->iteration_count = intval( $options['iterations'] );
		}

if ( ! empty( $options['salt'] ) ) {
			$this->salt_padding = $options['salt'];
		}

if ( ! empty( $options['key_length'] ) ) {
			$this->key_length = intval( $options['key_length'] );
		}
	}

// -----------------------------------------------------------------------------

public static function get_password_hash( $username, $password, $options = [] ) {

$hasher = new iThemes_Credentials( $username, $password, $options );

return $hasher->get_pbkdf2();
	}

// -----------------------------------------------------------------------------

public function get_salt() {

return strtolower( trim( $this->username ) ) . $this->salt_padding;
	}

// -----------------------------------------------------------------------------

public function get_pbkdf2() {

return $this->pbkdf2(
			$this->hash,
			$this->password,
			$this->get_salt(),
			$this->iteration_count,
			$this->key_length / 2,
			false 
		);
	}

// -----------------------------------------------------------------------------

/*
	 * PBKDF2 key derivation function as defined by RSA's PKCS #5: https://www.ietf.org/rfc/rfc2898.txt
	 * $algorithm - The hash algorithm to use. Recommended: SHA256
	 * $password - The password.
	 * $salt - A salt that is unique to the password.
	 * $count - Iteration count. Higher is better, but slower. Recommended: At least 1000.
	 * $key_length - The length of the derived key in bytes.
	 * $raw_output - If true, the key is returned in raw binary format. Hex encoded otherwise.
	 * Returns: A $key_length-byte key derived from the password and salt.
	 *
	 * Test vectors can be found here: https://www.ietf.org/rfc/rfc6070.txt
	 *
	 * This implementation of PBKDF2 was originally created by https://defuse.ca
	 * With improvements by http://www.variations-of-shadow.com
	 */
	private function pbkdf2( $algorithm, $password, $salt, $count, $key_length, $raw_output = false ) {

$algorithm = strtolower( $algorithm );

if ( ! in_array( $algorithm, hash_algos(), true ) ) {
			trigger_error( 'PBKDF2 ERROR: Invalid hash algorithm.', E_USER_ERROR );
		}

if ( $count <= 0 || $key_length <= 0 ) {
			trigger_error( 'PBKDF2 ERROR: Invalid parameters.', E_USER_ERROR );
		}

$hash_length = strlen( hash( $algorithm, '', true ) );
		$block_count = ceil( $key_length / $hash_length );

$output = '';

for ( $i = 1; $i <= $block_count; $i++ ) {

// $i encoded as 4 bytes, big endian.
			$last = $salt . pack( 'N', $i );

// first iteration
			$last = $xorsum = hash_hmac( $algorithm, $last, $password, true );

// perform the other $count - 1 iterations
			for ( $j = 1; $j < $count; $j++ ) {
				$xorsum ^= ( $last = hash_hmac( $algorithm, $last, $password, true ) );
			}

$output .= $xorsum;

}

if ( $raw_output ) {
			return substr( $output, 0, $key_length );
		} else {
			return bin2hex( substr( $output, 0, $key_length ) );
		}
	}

// -----------------------------------------------------------------------------
}

// -----------------------------------------------------------------------------