Merge pull request #618 from tobiasd/master

[friendica.git] / include / crypto.php

diff --git a/include/crypto.php b/include/crypto.php
index a20606db540a5313b67b7dcb67e147df74e33a62..ed0a35704e8a5c8f97ab7f26038828fd5b2fd53b 100644 (file)
--- a/include/crypto.php
+++ b/include/crypto.php
@@ -225,3 +225,72 @@ function pkcs5_unpad($text)
     if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
     return substr($text, 0, -1 * $pad);
 } 
+
+function AES256CBC_encrypt($data,$key,$iv) {
+       return mcrypt_encrypt(
+               MCRYPT_RIJNDAEL_128, 
+               str_pad($key,32,"\0"), 
+               pkcs5_pad($data,16), 
+               MCRYPT_MODE_CBC, 
+               str_pad($iv,16,"\0"));
+}
+
+function AES256CBC_decrypt($data,$key,$iv) {
+       return pkcs5_unpad(mcrypt_decrypt(
+               MCRYPT_RIJNDAEL_128, 
+               str_pad($key,32,"\0"), 
+               $data, 
+               MCRYPT_MODE_CBC, 
+               str_pad($iv,16,"\0")));
+}
+
+function aes_encapsulate($data,$pubkey) {
+       $key = random_string(32,RANDOM_STRING_TEXT);
+       $iv  = random_string(16,RANDOM_STRING_TEXT);
+       $result['data'] = base64url_encode(AES256CBC_encrypt($data,$key,$iv),true);
+       openssl_public_encrypt($key,$k,$pubkey);
+       $result['key'] = base64url_encode($k,true);
+       openssl_public_encrypt($iv,$i,$pubkey);
+       $result['iv'] = base64url_encode($i,true);
+       return $result;
+}
+
+function aes_unencapsulate($data,$prvkey) {
+       openssl_private_decrypt(base64url_decode($data['key']),$k,$prvkey);
+       openssl_private_decrypt(base64url_decode($data['iv']),$i,$prvkey);
+       return AES256CBC_decrypt(base64url_decode($data['data']),$k,$i);
+}
+
+function new_keypair($bits) {
+
+       $openssl_options = array(
+               'digest_alg'       => 'sha1',
+               'private_key_bits' => $bits,
+               'encrypt_key'      => false 
+       );
+
+       $conf = get_config('system','openssl_conf_file');
+       if($conf)
+               $openssl_options['config'] = $conf;
+       
+       $result = openssl_pkey_new($openssl_options);
+
+       if(empty($result)) {
+               logger('new_keypair: failed');
+               return false;
+       }
+
+       // Get private key
+
+       $response = array('prvkey' => '', 'pubkey' => '');
+
+       openssl_pkey_export($result, $response['prvkey']);
+
+       // Get public key
+       $pkey = openssl_pkey_get_details($result);
+       $response['pubkey'] = $pkey["key"];
+
+       return $response;
+
+}
+