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Function to verify signatures. 

Call with a set of verifier callbacks and optionally the index of the
signature to verify (if there is more than one signature).
This commit is contained in:
Stephen Paul Weber 2010-03-31 14:26:16 -05:00
parent 3b6b29127f
commit 8265522323
1 changed files with 26 additions and 0 deletions
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26
lib/openpgp.php
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@ -149,6 +149,32 @@ class OpenPGP_Message implements IteratorAggregate, ArrayAccess {
return $bytes;
}
/**
* Function to verify signature number $index
* $verifiers is an array of callbacks formatted like array('RSA' => array('SHA256' => CALLBACK)) that take two parameters: message and signature
*/
function verify($verifiers, $index=0) {
$msg = $this;
while($msg[0] instanceof OpenPGP_CompressedDataPacket) $msg = $msg[0];
$i = 0;
foreach($msg as $p) {
if($p instanceof OpenPGP_SignaturePacket) {
if($i == $index) $signature_packet = $p;
$i++;
}
if($p instanceof OpenPGP_LiteralDataPacket) $data_packet = $p;
if($signature_packet && $data_packet) break;
}
if(!$signature_packet || !$data_packet) return NULL; // No signature or no data
$verifier = $verifiers[$signature_packet->key_algorithm_name()][$signature_packet->hash_algorithm_name()];
if(!$verifier) return NULL; // No verifier
return call_user_func($verifier, $data_packet->data.$signature_packet->trailer, $signature_packet->data);
}
// IteratorAggregate interface
function getIterator() {