1 files changed, 40 insertions, 0 deletions
diff --git a/modules-available/rebootcontrol/inc/sshkey.inc.php b/modules-available/rebootcontrol/inc/sshkey.inc.php
new file mode 100644
index 00000000..b4e36d25
--- /dev/null
+++ b/modules-available/rebootcontrol/inc/sshkey.inc.php
@@ -0,0 +1,40 @@
+<?php
+
+class SSHKey
+{
+
+	public static function getPrivateKey() {
+		$privKey = Property::get("rebootcontrol-private-key");
+		if (!$privKey) {
+			$rsaKey = openssl_pkey_new(array(
+				'private_key_bits' => 2048,
+				'private_key_type' => OPENSSL_KEYTYPE_RSA));
+			openssl_pkey_export( openssl_pkey_get_private($rsaKey), $privKey);
+			Property::set("rebootcontrol-private-key", $privKey);
+		}
+		return $privKey;
+	}
+
+	public static function getPublicKey() {
+		$pkImport = openssl_pkey_get_private(self::getPrivateKey());
+		return self::sshEncodePublicKey($pkImport);
+	}
+
+	private static function sshEncodePublicKey($privKey) {
+		$keyInfo = openssl_pkey_get_details($privKey);
+		$buffer  = pack("N", 7) . "ssh-rsa" .
+			self::sshEncodeBuffer($keyInfo['rsa']['e']) .
+			self::sshEncodeBuffer($keyInfo['rsa']['n']);
+		return "ssh-rsa " . base64_encode($buffer);
+	}
+
+	private static function sshEncodeBuffer($buffer) {
+		$len = strlen($buffer);
+		if (ord($buffer[0]) & 0x80) {
+			$len++;
+			$buffer = "\x00" . $buffer;
+		}
+		return pack("Na*", $len, $buffer);
+	}
+
+}
+\ No newline at end of file