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108 lines
2.8 KiB
108 lines
2.8 KiB
<?php
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final class Encryption {
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private $key;
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private $method;
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private $cipher;
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function __construct($key, $opensslCipher = 'aes-128-cbc') {
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$this->key = $this->hash($key);
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if(function_exists('openssl_encrypt')) {
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$this->method = 'openssl';
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$this->cipher = $opensslCipher;
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} else {
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$this->method = 'base64';
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}
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}
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public function hash($value) {
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return hash('sha256', $value, true);
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}
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public function encrypt ($value, $key = NULL) {
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$this->key = ($key != NULL) ? $key : $this->key;
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if($this->method == 'openssl') {
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return $this->opensslEncrypt($value);
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} else {
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return $this->base64Encrypt($value);
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}
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}
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public function decrypt ($value, $key = NULL) {
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$this->key = ($key != NULL) ? $key : $this->key;
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if($this->method == 'openssl') {
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return $this->opensslDecrypt($value);
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} else {
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return $this->base64Decrypt($value);
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}
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}
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function base64Encrypt($value) {
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if (!$this->key) {
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return $value;
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}
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$output = '';
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for ($i = 0; $i < strlen($value); $i++) {
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$char = substr($value, $i, 1);
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$keychar = substr($this->key, ($i % strlen($this->key)) - 1, 1);
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$char = chr(ord($char) + ord($keychar));
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$output .= $char;
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}
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return base64_encode($output);
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}
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function base64Decrypt($value) {
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if (!$this->key) {
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return $value;
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}
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$output = '';
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$value = base64_decode($value);
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for ($i = 0; $i < strlen($value); $i++) {
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$char = substr($value, $i, 1);
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$keychar = substr($this->key, ($i % strlen($this->key)) - 1, 1);
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$char = chr(ord($char) - ord($keychar));
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$output .= $char;
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}
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return $output;
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}
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private function opensslEncrypt ($value) {
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$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($this->cipher));
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$ciphertext_raw = strtr(base64_encode(openssl_encrypt($value, $this->cipher, $this->hash( $this->key), 0, $iv)), '+/=', '-_,');
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//$hmac = hash_hmac('sha256', $ciphertext_raw, $this->key, true);
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$output = strtr($this->base64Encrypt( $iv.$ciphertext_raw ), '+/=', '-_,');
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return $output;
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}
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private function opensslDecrypt ($value) {
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$c = $this->base64Decrypt(strtr($value, '-_,', '+/='));
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$ivlen = openssl_cipher_iv_length($this->cipher);
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$iv = substr($c, 0, $ivlen);
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//$hmac = substr($c, $ivlen, $sha2len=32);
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$ciphertext_raw = substr($c, $ivlen);
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$output = trim(openssl_decrypt(base64_decode(strtr($ciphertext_raw, '-_,', '+/=')), $this->cipher, $this->hash($this->key), 0, $iv));
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return $output;
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}
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}
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