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wp-content/plugins/gravitysmtp/includes/utils/class-basic-ecrypted-hash.php

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+<?php
+
+namespace Gravity_Forms\Gravity_SMTP\Utils;
+
+class Basic_Encrypted_Hash {
+
+	const METHOD = 'aes-256-ctr';
+
+	public function encrypt( $message ) {
+		$nonce_size = openssl_cipher_iv_length( self::METHOD );
+		$nonce      = openssl_random_pseudo_bytes( $nonce_size );
+
+		$cipher = openssl_encrypt(
+			$message,
+			self::METHOD,
+			SECURE_AUTH_KEY,
+			OPENSSL_RAW_DATA,
+			$nonce
+		);
+
+		return base64_encode( $nonce . $cipher );
+	}
+
+	public function decrypt( $message ) {
+		$message = base64_decode( $message, true );
+
+		if ( $message === false ) {
+			return new \WP_Error( 'bad_encryption', 'Encryption failure' );
+		}
+
+		$nonce_size = openssl_cipher_iv_length( self::METHOD );
+		$nonce      = mb_substr( $message, 0, $nonce_size, '8bit' );
+		$cipher     = mb_substr( $message, $nonce_size, null, '8bit' );
+
+		$plaintext = openssl_decrypt(
+			$cipher,
+			self::METHOD,
+			SECURE_AUTH_KEY,
+			OPENSSL_RAW_DATA,
+			$nonce
+		);
+
+		return $plaintext;
+	}
+
+}