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SSH2: fix rare key exchange issue

This commit is contained in:
terrafrost 2020-01-07 00:20:47 -06:00
parent 3ba5902046
commit 61ffe1a147
1 changed files with 3 additions and 1 deletions
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4
phpseclib/Net/SSH2.php
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@ -1616,7 +1616,9 @@ class SSH2
$temp = unpack('Nlength', substr($this->signature, 0, 4));
$this->signature_format = substr($this->signature, 4, $temp['length']);
$keyBytes = DH::computeSecret($ourPrivate, $theirPublicBytes);
if (($keyBytes[0] & "\x80") === "\x80") {
if (($keyBytes & "\xFF\x80") === "\x00\x00") {
$keyBytes = substr($keyBytes, 1);
} elseif (($keyBytes[0] & "\x80") === "\x80") {
$keyBytes = "\0$keyBytes";
}