Using PHP-GPG with Wordpress - php

Question

I'm working on an implementation, which should send every outgoing mail from my Wordpress installation gpg encrypted.
I built my small plugin with tutorial from Tim Nash, and I used the php-gpg lib from Jason Hinkle. When I send an email from Wordpress 4.3, I get an pgp-encrypted mail, but I can't open it, because WP / my plugin uses the wrong public key. I checked it out, and pasted the right key in my user wp-profile, but ... nothing: wrong key. Have you any ideas?
<?php
/** #package php-gpg::GPG */
/** seed rand */
list($gpg_usec, $gpg_sec) = explode(' ', microtime());
srand((float) $gpg_sec + ((float) $gpg_usec * 100000));
/**
* #package php-gpg::GPG
*/
class GPG_Utility
{
static function starts_with($haystack, $needle)
{
return $needle === "" || strpos($haystack, $needle) === 0;
}
static function B0($x) {
return ($x & 0xff);
}
static function B1($x) {
return (($x >> 0x8) & 0xff);
}
static function B2($x) {
return (($x >> 0x10) & 0xff);
}
static function B3($x) {
return (($x >> 0x18) & 0xff);
}
static function zshift($x, $s) {
$res = $x >> $s;
$pad = 0;
for ($i = 0; $i < 32 - $s; $i++) $pad += (1 << $i);
return $res & $pad;
}
static function pack_octets($octets)
{
$i = 0;
$j = 0;
$len = count($octets);
$b = array_fill(0, $len / 4, 0);
if (!$octets || $len % 4) return;
for ($i = 0, $j = 0; $j < $len; $j += 4) {
$b[$i++] = $octets[$j] | ($octets[$j + 1] << 0x8) | ($octets[$j + 2] << 0x10) | ($octets[$j + 3] << 0x18);
}
return $b;
}
static function unpack_octets($packed)
{
$j = 0;
$i = 0;
$l = count($packed);
$r = array_fill(0, $l * 4, 0);
for ($j = 0; $j < $l; $j++) {
$r[$i++] = GPG_Utility::B0($packed[$j]);
$r[$i++] = GPG_Utility::B1($packed[$j]);
$r[$i++] = GPG_Utility::B2($packed[$j]);
$r[$i++] = GPG_Utility::B3($packed[$j]);
}
return $r;
}
static function hex2bin($h)
{
if(strlen($h) % 2) $h += "0";
$r = "";
for($i = 0; $i < strlen($h); $i += 2) {
$r .= chr(intval($h[$i], 16) * 16 + intval($h[$i + 1], 16));
}
return $r;
}
static function crc24($data)
{
$crc = 0xb704ce;
for($n = 0; $n < strlen($data); $n++) {
$crc ^= (ord($data[$n]) & 0xff) << 0x10;
for($i = 0; $i < 8; $i++) {
$crc <<= 1;
if($crc & 0x1000000) $crc ^= 0x1864cfb;
}
}
return
chr(($crc >> 0x10) & 0xff) .
chr(($crc >> 0x8) & 0xff) .
chr($crc & 0xff);
}
static function s_random($len, $textmode)
{
$r = "";
for($i = 0; $i < $len;)
{
$t = rand(0, 0xff);
if($t == 0 && $textmode) continue;
$i++;
$r .= chr($t);
}
return $r;
}
static function c_random() {
return round(rand(0, 0xff));
}
}
?>