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<?php
namespace WPForms\Helpers;
/**
* Class for encryption functionality.
*
* @since 1.6.1.2
*
* @link https://www.php.net/manual/en/intro.sodium.php
*/
class Crypto {
/**
* Get a secret key for encrypt/decrypt.
*
* @since 1.6.1.2
*
* @return string
*/
public static function get_secret_key() {
$secret_key = get_option( 'wpforms_crypto_secret_key' );
// If we already have the secret, send it back.
if ( false !== $secret_key ) {
return base64_decode( $secret_key ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode
}
// We don't have a secret, so let's generate one.
$secret_key = sodium_crypto_secretbox_keygen();
add_option( 'wpforms_crypto_secret_key', base64_encode( $secret_key ) ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
return $secret_key;
}
/**
* Encrypt a message.
*
* @since 1.6.1.2
*
* @param string $message Message to encrypt.
* @param string $key Encryption key.
*
* @return string
*/
public static function encrypt( $message, $key = '' ) {
// Create a nonce for this operation. It will be stored and recovered in the message itself.
$nonce = random_bytes(
SODIUM_CRYPTO_SECRETBOX_NONCEBYTES
);
if ( empty( $key ) ) {
$key = self::get_secret_key();
}
// Encrypt message and combine with nonce.
$cipher = base64_encode( // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
$nonce .
sodium_crypto_secretbox(
$message,
$nonce,
$key
)
);
try {
sodium_memzero( $message );
sodium_memzero( $key );
} catch ( \Exception $e ) {
return $cipher;
}
return $cipher;
}
/**
* Decrypt a message.
*
* @since 1.6.1.2
*
* @param string $encrypted Encrypted message.
* @param string $key Encryption key.
*
* @return string
*/
public static function decrypt( $encrypted, $key = '' ) {
// Unpack base64 message.
$decoded = base64_decode( $encrypted ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode
if ( false === $decoded ) {
return false;
}
if ( mb_strlen( $decoded, '8bit' ) < ( SODIUM_CRYPTO_SECRETBOX_NONCEBYTES + SODIUM_CRYPTO_SECRETBOX_MACBYTES ) ) {
return false;
}
// Pull nonce and ciphertext out of unpacked message.
$nonce = mb_substr( $decoded, 0, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, '8bit' );
$ciphertext = mb_substr( $decoded, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, null, '8bit' );
if ( empty( $key ) ) {
$key = self::get_secret_key();
}
// Decrypt it.
$message = sodium_crypto_secretbox_open(
$ciphertext,
$nonce,
$key
);
// Check for decrpytion failures.
if ( false === $message ) {
return false;
}
try {
sodium_memzero( $ciphertext );
sodium_memzero( $key );
} catch ( \Exception $e ) {
return $message;
}
return $message;
}
}