19261079b7
Some notable changes, from upstream's release notes: - sshd(8): Remove support for obsolete "host/port" syntax. - ssh(1): When prompting whether to record a new host key, accept the key fingerprint as a synonym for "yes". - ssh-keygen(1): when acting as a CA and signing certificates with an RSA key, default to using the rsa-sha2-512 signature algorithm. - ssh(1), sshd(8), ssh-keygen(1): this release removes the "ssh-rsa" (RSA/SHA1) algorithm from those accepted for certificate signatures. - ssh-sk-helper(8): this is a new binary. It is used by the FIDO/U2F support to provide address-space isolation for token middleware libraries (including the internal one). - ssh(1): this release enables UpdateHostkeys by default subject to some conservative preconditions. - scp(1): this release changes the behaviour of remote to remote copies (e.g. "scp host-a:/path host-b:") to transfer through the local host by default. - scp(1): experimental support for transfers using the SFTP protocol as a replacement for the venerable SCP/RCP protocol that it has traditionally used. Additional integration work is needed to support FIDO/U2F in the base system. Deprecation Notice ------------------ OpenSSH will disable the ssh-rsa signature scheme by default in the next release. Reviewed by: imp MFC after: 1 month Relnotes: Yes Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D29985
72 lines
1.6 KiB
Plaintext
72 lines
1.6 KiB
Plaintext
This document describes the private key format for OpenSSH.
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1. Overall format
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The key consists of a header, a list of public keys, and
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an encrypted list of matching private keys.
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#define AUTH_MAGIC "openssh-key-v1"
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byte[] AUTH_MAGIC
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string ciphername
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string kdfname
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string kdfoptions
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int number of keys N
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string publickey1
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string publickey2
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...
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string publickeyN
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string encrypted, padded list of private keys
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2. KDF options for kdfname "bcrypt"
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The options:
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string salt
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uint32 rounds
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are concatenated and represented as a string.
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3. Unencrypted list of N private keys
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The list of privatekey/comment pairs is padded with the
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bytes 1, 2, 3, ... until the total length is a multiple
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of the cipher block size.
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uint32 checkint
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uint32 checkint
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byte[] privatekey1
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string comment1
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byte[] privatekey2
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string comment2
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...
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string privatekeyN
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string commentN
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char 1
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char 2
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char 3
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...
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char padlen % 255
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where each private key is encoded using the same rules as used for
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SSH agent.
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Before the key is encrypted, a random integer is assigned
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to both checkint fields so successful decryption can be
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quickly checked by verifying that both checkint fields
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hold the same value.
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4. Encryption
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The KDF is used to derive a key, IV (and other values required by
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the cipher) from the passphrase. These values are then used to
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encrypt the unencrypted list of private keys.
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5. No encryption
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For unencrypted keys the cipher "none" and the KDF "none"
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are used with empty passphrases. The options if the KDF "none"
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are the empty string.
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$OpenBSD: PROTOCOL.key,v 1.2 2021/05/07 02:29:40 djm Exp $
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