function CramMd5Authenticator::getResponse

Generates a CRAM-MD5 response from a server challenge.

1 call to CramMd5Authenticator::getResponse()

CramMd5Authenticator::authenticate in vendor/symfony/mailer/Transport/Smtp/Auth/CramMd5Authenticator.php

File

vendor/symfony/mailer/Transport/Smtp/Auth/CramMd5Authenticator.php, line 43

Class

CramMd5Authenticator

Handles CRAM-MD5 authentication.

Namespace

Symfony\Component\Mailer\Transport\Smtp\Auth

Code

private function getResponse(string $secret, string $challenge) : string {
    if (!$secret) {
        throw new InvalidArgumentException('A non-empty secret is required.');
    }
    if (\strlen($secret) > 64) {
        $secret = pack('H32', md5($secret));
    }
    if (\strlen($secret) < 64) {
        $secret = str_pad($secret, 64, \chr(0));
    }
    $kipad = substr($secret, 0, 64) ^ str_repeat(\chr(0x36), 64);
    $kopad = substr($secret, 0, 64) ^ str_repeat(\chr(0x5c), 64);
    $inner = pack('H32', md5($kipad . $challenge));
    return md5($kopad . $inner);
}