mirror of
git://anongit.mindrot.org/openssh.git
synced 2024-12-22 10:00:14 +00:00
69 lines
1.5 KiB
Plaintext
69 lines
1.5 KiB
Plaintext
|
This document describes the private key format for OpenSSH.
|
||
|
|
|
||
|
|
1. Overall format
|
||
|
|
|
||
|
|
The key consists of a header, a list of public keys, and
|
||
|
|
an encrypted list of matching private keys.
|
||
|
|
|
||
|
|
#define AUTH_MAGIC "openssh-key-v1"
|
||
|
|
|
||
|
|
byte[] AUTH_MAGIC
|
||
|
|
string ciphername
|
||
|
|
string kdfname
|
||
|
|
string kdfoptions
|
||
|
|
int number of keys N
|
||
|
|
string publickey1
|
||
|
|
string publickey2
|
||
|
|
...
|
||
|
|
string publickeyN
|
||
|
|
string encrypted, padded list of private keys
|
||
|
|
|
||
|
|
2. KDF options for kdfname "bcrypt"
|
||
|
|
|
||
|
|
The options:
|
||
|
|
|
||
|
|
string salt
|
||
|
|
uint32 rounds
|
||
|
|
|
||
|
|
are concatenated and represented as a string.
|
||
|
|
|
||
|
|
3. Unencrypted list of N private keys
|
||
|
|
|
||
|
|
The list of privatekey/comment pairs is padded with the
|
||
|
|
bytes 1, 2, 3, ... until the total length is a multiple
|
||
|
|
of the cipher block size.
|
||
|
|
|
||
|
|
uint32 checkint
|
||
|
|
uint32 checkint
|
||
|
|
string privatekey1
|
||
|
|
string comment1
|
||
|
|
string privatekey2
|
||
|
|
string comment2
|
||
|
|
...
|
||
|
|
string privatekeyN
|
||
|
|
string commentN
|
||
|
|
char 1
|
||
|
|
char 2
|
||
|
|
char 3
|
||
|
|
...
|
||
|
|
char padlen % 255
|
||
|
|
|
||
|
|
Before the key is encrypted, a random integer is assigned
|
||
|
|
to both checkint fields so successful decryption can be
|
||
|
|
quickly checked by verifying that both checkint fields
|
||
|
|
hold the same value.
|
||
|
|
|
||
|
|
4. Encryption
|
||
|
|
|
||
|
|
The KDF is used to derive a key, IV (and other values required by
|
||
|
|
the cipher) from the passphrase. These values are then used to
|
||
|
|
encrypt the unencrypted list of private keys.
|
||
|
|
|
||
|
|
5. No encryption
|
||
|
|
|
||
|
|
For unencrypted keys the cipher "none" and the KDF "none"
|
||
|
|
are used with empty passphrases. The options if the KDF "none"
|
||
|
|
are the empty string.
|
||
|
|
|
||
|
|
$OpenBSD: PROTOCOL.key,v 1.1 2013/12/06 13:34:54 markus Exp $
|