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<title>[1947] sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments: WordCamp Payments: Add encryption to some payment request fields.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="http://meta.trac.wordpress.org/changeset/1947">1947</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"http://meta.trac.wordpress.org/changeset/1947","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>kovshenin</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2015-10-07 11:52:06 +0000 (Wed, 07 Oct 2015)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>WordCamp Payments: Add encryption to some payment request fields.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcamppaymentsbootstrapphp">sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/bootstrap.php</a></li>
<li><a href="#sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcamppaymentsclassespaymentrequestphp">sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/classes/payment-request.php</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcamppaymentsclassesencryptionphp">sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/classes/encryption.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcamppaymentsbootstrapphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/bootstrap.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/bootstrap.php   2015-10-07 09:42:51 UTC (rev 1946)
+++ sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/bootstrap.php     2015-10-07 11:52:06 UTC (rev 1947)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -14,6 +14,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> if ( is_admin() ) {
</span><span class="cx" style="display: block; padding: 0 10px">        require_once( __DIR__ . '/classes/wordcamp-payments.php' );
</span><span class="cx" style="display: block; padding: 0 10px">        require_once( __DIR__ . '/classes/payment-request.php' );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        require_once( __DIR__ . '/classes/encryption.php' );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        $GLOBALS['wordcamp_payments']   = new WordCamp_Payments();
</span><span class="cx" style="display: block; padding: 0 10px">        $GLOBALS['wcp_payment_request'] = new WCP_Payment_Request();
</span></span></pre></div>
<a id="sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcamppaymentsclassesencryptionphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/classes/encryption.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/classes/encryption.php                          (rev 0)
+++ sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/classes/encryption.php    2015-10-07 11:52:06 UTC (rev 1947)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,110 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * WordCamp Payments Encryption
+ *
+ * Usage:
+ *
+ * WCP_Encryption::encrypt() to encrypt a string
+ * WCP_Encryption::decrypt() to decrypt a string
+ * WCP_Encription::maybe_decrypt() to decrypt a string that may or may not be encrypted.
+ */
+class WCP_Encryption {
+       public static $key = null;
+       public static $hmac_key = null;
+
+       /**
+        * Read some secrets.
+        */
+       public static function init() {
+               if ( is_null( self::$key ) ) {
+                       self::$key = '';
+                       self::$hmac_key = '';
+
+                       if ( defined( 'WORDCAMP_PAYMENTS_ENCRYPTION_KEY' ) && WORDCAMP_PAYMENTS_ENCRYPTION_KEY )
+                               self::$key = WORDCAMP_PAYMENTS_ENCRYPTION_KEY;
+
+                       if ( defined( 'WORDCAMP_PAYMENTS_HMAC_KEY' ) && WORDCAMP_PAYMENTS_HMAC_KEY )
+                               self::$hmac_key = WORDCAMP_PAYMENTS_HMAC_KEY;
+               }
+
+               return ( ! empty( self::$key ) && ! empty( self::$hmac_key ) );
+       }
+
+       /**
+        * Encrypt some data.
+        *
+        * @param string $raw_data The string to encrypt.
+        * @return string|object Encrypted string (encrypted:data:key:iv:hmac) or WP_Error.
+        */
+       public static function encrypt( $raw_data ) {
+               if ( ! is_string( $raw_data ) )
+                       return new WP_Error( 'encryption-error', 'Only strings can be encrypted.' );
+
+               if ( ! self::init() )
+                       return new WP_Error( 'encryption-error', 'Could not init encryption keys.' );
+
+               $iv = openssl_random_pseudo_bytes( 16, $is_iv_strong );
+
+               if ( ! $is_iv_strong )
+                       return new WP_Error( 'encryption-error', 'Could not obtain a strong iv.' );
+
+               $data = array();
+               $data['data'] = openssl_encrypt( $raw_data, 'aes-256-ctr', self::$key, true, $iv );
+               $data['hmac'] = hash_hmac( 'sha256', $data['data'], self::$hmac_key, true );
+               $data['iv'] = $iv;
+
+               if ( ! $data['data'] || ! $data['iv'] || ! $data['hmac'] )
+                       return new WP_Error( 'encryption-error', 'Could not encrypt the data.' );
+
+               $data = array_map( 'base64_encode', $data );
+               return sprintf( 'encrypted:%s:%s:%s', $data['data'], $data['iv'], $data['hmac'] );
+       }
+
+       /**
+        * Decrypt some data.
+        *
+        * @param string $data The data to decrypt.
+        * @return string|object The decrypted data or WP_Error.
+        */
+       public static function decrypt( $data ) {
+               if ( ! is_string( $data ) )
+                       return new WP_Error( 'encryption-error', 'Only strings can be decrypted.' );
+
+               if ( ! self::init() )
+                       return new WP_Error( 'encryption-error', 'Could not init encryption keys.' );
+
+               $data = explode( ':', $data );
+               $data = array_map( 'base64_decode', $data );
+               list( $null, $data, $iv, $hmac ) = $data;
+
+               // Verify hmac.
+               if ( $hmac !== hash_hmac( 'sha256', $data, self::$hmac_key, true ) )
+                       return new WP_Error( 'encryption-error', 'HMAC mismatch.' );
+
+               $data = openssl_decrypt( $data, 'aes-256-ctr', self::$key, true, $iv );
+               return $data;
+       }
+
+       /**
+        * Look for encrypted:... and run self::decrypt() if found.
+        *
+        * @param string $data Maybe some encrypted data.
+        * @param object $error Null or WP_Error on error (by reference).
+        * @return mixed The decrypted data, an empty string on decryption error, or anything else that's passed and isn't a string.
+        */
+       public static function maybe_decrypt( $data, &$error = null ) {
+               if ( ! is_string( $data ) )
+                       return $data;
+
+               if ( strpos( $data, 'encrypted:' ) !== 0 )
+                       return $data;
+
+               $decrypted = self::decrypt( $data );
+               if ( is_wp_error( $decrypted ) ) {
+                       $error = $decrypted;
+                       return '';
+               }
+
+               return $decrypted;
+       }
+}
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of file
</span></span></pre></div>
<a id="sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcamppaymentsclassespaymentrequestphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/classes/payment-request.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/classes/payment-request.php     2015-10-07 09:42:51 UTC (rev 1946)
+++ sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments/classes/payment-request.php       2015-10-07 11:52:06 UTC (rev 1947)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -382,6 +382,24 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                break;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                $encrypted_fields = array(
+                       'payable_to',
+                       'beneficiary_name',
+                       'beneficiary_account_number',
+                       'beneficiary_street_address',
+                       'beneficiary_city',
+                       'beneficiary_state',
+                       'beneficiary_zip_code',
+                       'beneficiary_country',
+               );
+
+               if ( in_array( $name, $encrypted_fields ) ) {
+                       $decrypted = WCP_Encryption::maybe_decrypt( $value );
+                       if ( ! is_wp_error( $decrypted ) )
+                               $value = $decrypted;
+               }
+
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 return $value;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -767,6 +785,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        protected function sanitize_save_normal_fields( $post_id ) {
</span><span class="cx" style="display: block; padding: 0 10px">                foreach ( $_POST as $key => $unsafe_value ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        $unsafe_value = wp_unslash( $unsafe_value );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                         switch ( $key ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                case 'description':
</span><span class="cx" style="display: block; padding: 0 10px">                                case 'general_notes':
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -827,6 +847,23 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( ! is_null( $safe_value ) ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                $encrypted_fields = array(
+                                       'payable_to',
+                                       'beneficiary_name',
+                                       'beneficiary_account_number',
+                                       'beneficiary_street_address',
+                                       'beneficiary_city',
+                                       'beneficiary_state',
+                                       'beneficiary_zip_code',
+                                       'beneficiary_country',
+                               );
+
+                               if ( in_array( $key, $encrypted_fields ) ) {
+                                       $encrypted_value = WCP_Encryption::encrypt( $safe_value );
+                                       if ( ! is_wp_error( $encrypted_value ) )
+                                               $safe_value = $encrypted_value;
+                               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                                 update_post_meta( $post_id, '_camppayments_' . $key, $safe_value );
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span></span></pre>
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