90 lines
2.8 KiB
PHP
90 lines
2.8 KiB
PHP
<?php
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function diaspora_base_message($type,$data) {
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$tpl = get_markup_template('diaspora_' . $type . '.tpl');
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if(! $tpl)
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return '';
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return replace_macros($tpl,$data);
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}
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function diaspora_msg_build($msg,$user,$contact,$prvkey,$pubkey) {
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$a = get_app();
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$inner_aes_key = random_string(16);
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$b_inner_aes_key = base64_encode($inner_aes_key);
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$inner_iv = random_string(16);
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$b_inner_iv = base64_encode($inner_iv);
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$outer_aes_key = random_string(16);
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$b_outer_aes_key = base64_encode($outer_aes_key);
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$outer_iv = random_string(16);
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$b_outer_iv = base64_encode($outer_iv);
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$handle = 'acct:' . $user['nickname'] . '@' . substr($a->get_baseurl(), strpos('://') + 3);
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$padded_data = pkcs5_pad($msg);
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$inner_encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $padded_data, MCRYPT_MODE_CBC, $inner_iv);
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$b64_data = base64_encode($inner_encrypted);
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$b64url_data = base64url_encode($b64_data);
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$b64url_stripped = str_replace(array("\n","\r"," ","\t"),array('','','',''),$b64url_data);
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$lines = str_split($b64url_stripped,60);
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$data = implode("\n",$lines);
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$data = $data . (($data[-1] != "\n") ? "\n" : '') ;
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$type = 'application/atom+xml';
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$encoding = 'base64url';
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$alg = 'RSA-SHA256';
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$signable_data = $data . '.' . base64url_encode($type) . "\n" . '.'
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. base64url_encode($encoding) . "\n" . '.' . base64url_encode($alg) . "\n";
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$signature = '';
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$result = openssl_sign($signable_data,$signature,$prvkey,'SHA256');
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$sig = base64url_encode($signature);
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$decrypted_header = <<< EOT
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<decrypted_header>
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<iv>$b_inner_iv</iv>
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<aes_key>$b_inner_aes_key</aes_key>
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<author>
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<name>{$contact['name']}</name>
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<uri>$handle</uri>
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</author>
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</decrypted_header>
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EOT;
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$decrypted_header = pkcs5_pad($decrypted_header);
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$ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $outer_aes_key, $decrypted_header, MCRYPT_MODE_CBC, $outer_iv);
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$outer_json = json_encode(array('iv' => $b64_outer_iv,'key' => $b64_outer_aes_key));
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$encrypted_outer_key_bundle = '';
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openssl_public_encrypt($outer_json,$encrypted_outer_key_bundle,$pubkey);
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$b64_encrypted_outer_key_bundle = base64_encode($encrypted_outer_key_bundle);
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$encrypted_header_json_object = json_encode(array('aes_key' => base64_encode($encrypted_outer_key_bundle),
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'ciphertext' => base64_encode($ciphertext)));
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$encrypted_header = '<encrypted_header>' . base64_encode($encrypted_header_json_object) . '</encrypted_header>';
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$magicenv = <<< EOT
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<?xml version='1.0' encoding='UTF-8'?>
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<entry xmlns='http://www.w3.org/2005/Atom'>
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$encrypted_header
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<me:env xmlns:me="http://salmon-protocol.org/ns/magic-env">
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<me:encoding>base64url</me:encoding>
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<me:alg>RSA-SHA256</me:alg>
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<me:data type="application/atom+xml">$data</me:data>
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<me:sig>$sig</me:sig>
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</me:env>
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</entry>
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EOT;
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return $magic_env;
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}
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