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-rw-r--r--include/crypto.php65
1 files changed, 65 insertions, 0 deletions
diff --git a/include/crypto.php b/include/crypto.php
index a20606db5..88e05b9eb 100644
--- a/include/crypto.php
+++ b/include/crypto.php
@@ -225,3 +225,68 @@ 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 zot_encapsulate($data,$sender,$pubkey) {
+$res = aes_encapsulate($data,$pubkey);
+openssl_public_encrypt($sender,$s,$pubkey);
+$s1 = base64url_encode($s,true);
+
+return <<< EOT
+<?xml version='1.0' encoding='UTF-8'?>
+<zot:env xmlns:zot='http://purl.org/zot/1.0'>
+ <zot:key>{$res['key']}</zot:key>
+ <zot:iv>{$res['iv']}</zot:iv>
+ <zot:sender>$s1</zot:sender>
+ <zot:alg>AES-256-CBC</zot:alg>
+ <zot:data type='application/magic-envelope+xml'>{$res['data']}</zot:data>
+</zot:env>
+EOT;
+
+}
+
+function zot_unencapsulate($data,$prvkey) {
+ $ret = array();
+ $c = array();
+ $x = parse_xml_string($data);
+ $c = array('key' => $x->key,'iv' => $x->iv,'data' => $x->data);
+ openssl_private_decrypt(base64url_decode($x->sender),$s,$prvkey);
+ $ret['sender'] = $s;
+ $ret['data'] = aes_unencapsulate($x,$prvkey);
+ return $ret;
+} \ No newline at end of file