Current File : /var/www/projetos/romanian.ongrace.com/wp-content/plugins/easy-wp-smtp/inc/Cryptor.php
<?php
/**
* Simple example of using the openssl encrypt/decrypt functions that
* are inadequately documented in the PHP manual.
*
* Available under the MIT License
*
* The MIT License (MIT)
* Copyright (c) 2016 ionCube Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
* documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of
* the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
* THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
* OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
* OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
namespace ioncube\phpOpensslCryptor;
class Cryptor {
private $cipher_algo;
private $hash_algo;
private $iv_num_bytes;
private $format;
const FORMAT_RAW = 0;
const FORMAT_B64 = 1;
const FORMAT_HEX = 2;
/**
* Construct a Cryptor, using aes256 encryption, sha256 key hashing and base64 encoding.
* @param string $cipher_algo The cipher algorithm.
* @param string $hash_algo Key hashing algorithm.
* @param [type] $fmt Format of the encrypted data.
*/
public function __construct( $cipher_algo = 'aes-256-ctr', $hash_algo = 'sha256', $fmt = Cryptor::FORMAT_B64 ) {
$this->cipher_algo = $cipher_algo;
$this->hash_algo = $hash_algo;
$this->format = $fmt;
if ( ! in_array( $cipher_algo, openssl_get_cipher_methods( true ) ) ) {
throw new \Exception( "Cryptor:: - unknown cipher algo {$cipher_algo}" );
}
if ( ! in_array( $hash_algo, openssl_get_md_methods( true ) ) ) {
throw new \Exception( "Cryptor:: - unknown hash algo {$hash_algo}" );
}
$this->iv_num_bytes = openssl_cipher_iv_length( $cipher_algo );
}
/**
* Encrypt a string.
* @param string $in String to encrypt.
* @param string $key Encryption key.
* @param int $fmt Optional override for the output encoding. One of FORMAT_RAW, FORMAT_B64 or FORMAT_HEX.
* @return string The encrypted string.
*/
public function encryptString( $in, $key, $fmt = null ) {
if ( $fmt === null ) {
$fmt = $this->format;
}
// Build an initialisation vector
$iv = openssl_random_pseudo_bytes( $this->iv_num_bytes, $isStrongCrypto );
if ( ! $isStrongCrypto ) {
throw new \Exception( "Cryptor::encryptString() - Not a strong key" );
}
// Hash the key
$keyhash = openssl_digest( $key, $this->hash_algo, true );
// and encrypt
$opts = OPENSSL_RAW_DATA;
$encrypted = openssl_encrypt( $in, $this->cipher_algo, $keyhash, $opts, $iv );
if ( $encrypted === false ) {
throw new \Exception( 'Cryptor::encryptString() - Encryption failed: ' . openssl_error_string() );
}
// The result comprises the IV and encrypted data
$res = $iv . $encrypted;
// and format the result if required.
if ( $fmt == Cryptor::FORMAT_B64 ) {
$res = base64_encode( $res );
} else if ( $fmt == Cryptor::FORMAT_HEX ) {
$unp = unpack( 'H*', $res );
$res = $unp[ 1 ];
}
return $res;
}
/**
* Decrypt a string.
* @param string $in String to decrypt.
* @param string $key Decryption key.
* @param int $fmt Optional override for the input encoding. One of FORMAT_RAW, FORMAT_B64 or FORMAT_HEX.
* @return string The decrypted string.
*/
public function decryptString( $in, $key, $fmt = null ) {
if ( $fmt === null ) {
$fmt = $this->format;
}
$raw = $in;
// Restore the encrypted data if encoded
if ( $fmt == Cryptor::FORMAT_B64 ) {
$raw = base64_decode( $in );
} else if ( $fmt == Cryptor::FORMAT_HEX ) {
$raw = pack( 'H*', $in );
}
// and do an integrity check on the size.
if ( strlen( $raw ) < $this->iv_num_bytes ) {
throw new \Exception( 'Cryptor::decryptString() - ' .
'data length ' . strlen( $raw ) . " is less than iv length {$this->iv_num_bytes}" );
}
// Extract the initialisation vector and encrypted data
$iv = substr( $raw, 0, $this->iv_num_bytes );
$raw = substr( $raw, $this->iv_num_bytes );
// Hash the key
$keyhash = openssl_digest( $key, $this->hash_algo, true );
// and decrypt.
$opts = OPENSSL_RAW_DATA;
$res = openssl_decrypt( $raw, $this->cipher_algo, $keyhash, $opts, $iv );
if ( $res === false ) {
throw new \Exception( 'Cryptor::decryptString - decryption failed: ' . openssl_error_string() );
}
return $res;
}
/**
* Static convenience method for encrypting.
* @param string $in String to encrypt.
* @param string $key Encryption key.
* @param int $fmt Optional override for the output encoding. One of FORMAT_RAW, FORMAT_B64 or FORMAT_HEX.
* @return string The encrypted string.
*/
public static function Encrypt( $in, $key, $fmt = null ) {
$c = new Cryptor();
return $c->encryptString( $in, $key, $fmt );
}
/**
* Static convenience method for decrypting.
* @param string $in String to decrypt.
* @param string $key Decryption key.
* @param int $fmt Optional override for the input encoding. One of FORMAT_RAW, FORMAT_B64 or FORMAT_HEX.
* @return string The decrypted string.
*/
public static function Decrypt( $in, $key, $fmt = null ) {
$c = new Cryptor();
return $c->decryptString( $in, $key, $fmt );
}
}
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