PrivateSshKey.php

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<?php
 
namespace Depage\Fs;
 
use Depage\Fs\Exceptions\FsException;
 
class PrivateSshKey extends PublicSshKey
{
    protected function parse($keyString)
    {
        $details = $this->openssl_pkey_get_private($keyString);
 
        if ($details === false) {
            throw new FsException('Invalid SSH private key format (PEM format required).');
        }
 
        return $details;
    }

    public function extractPublicKey($tmpDir)
    {
        $details = openssl_pkey_get_details($this->key);
 
        if (isset($details['rsa'])) {
            $buffer = pack('N', 7) . 'ssh-rsa' .
                $this->sshEncodeBuffer($details['rsa']['e']) .
                $this->sshEncodeBuffer($details['rsa']['n']);
        } else {
            throw new FsException('Currently public key generation is only supported for RSA keys.');
        }
        $publicKeyString = 'ssh-rsa ' . base64_encode($buffer) . "\n";
 
        return new PublicSshKey($publicKeyString, $tmpDir);
    }

    protected function sshEncodeBuffer($buffer)
    {
        $len = strlen($buffer);
        if (ord($buffer[0]) & 0x80) {
            $len++;
            $buffer = "\x00" . $buffer;
        }
 
        return pack('Na*', $len, $buffer);
    }

    protected function openssl_pkey_get_private($key, $passphrase = '')
    {
        return \openssl_pkey_get_private($key, $passphrase);
    }
}
 
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