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module SSHData
module PublicKey
# Public key algorithm identifiers
ALGO_RSA = "ssh-rsa"
ALGO_DSA = "ssh-dss"
ALGO_ECDSA256 = "ecdsa-sha2-nistp256"
ALGO_ECDSA384 = "ecdsa-sha2-nistp384"
ALGO_ECDSA521 = "ecdsa-sha2-nistp521"
ALGO_ED25519 = "ssh-ed25519"
ALGO_SKED25519 = "sk-ssh-ed25519@openssh.com"
ALGO_SKECDSA256 = "sk-ecdsa-sha2-nistp256@openssh.com"
# RSA SHA2 *signature* algorithms used with ALGO_RSA keys.
# https://tools.ietf.org/html/draft-rsa-dsa-sha2-256-02
ALGO_RSA_SHA2_256 = "rsa-sha2-256"
ALGO_RSA_SHA2_512 = "rsa-sha2-512"
ALGOS = [
ALGO_RSA, ALGO_DSA, ALGO_ECDSA256, ALGO_ECDSA384, ALGO_ECDSA521,
ALGO_ED25519, ALGO_SKECDSA256, ALGO_SKED25519
]
# Parse an OpenSSH public key in authorized_keys format (see sshd(8) manual
# page).
#
# key - An OpenSSH formatted public key, including algo, base64 encoded key
# and optional comment.
#
# Returns a PublicKey::Base subclass instance.
def self.parse_openssh(key)
algo, raw, _ = SSHData.key_parts(key)
parsed = parse_rfc4253(raw)
if parsed.algo != algo
raise DecodeError, "algo mismatch: #{parsed.algo.inspect}!=#{algo.inspect}"
end
parsed
end
# Deprecated
singleton_class.send(:alias_method, :parse, :parse_openssh)
# Parse an RFC 4253 binary SSH public key.
#
# key - A RFC 4253 binary public key String.
#
# Returns a PublicKey::Base subclass instance.
def self.parse_rfc4253(raw)
data, read = Encoding.decode_public_key(raw)
if read != raw.bytesize
raise DecodeError, "unexpected trailing data"
end
from_data(data)
end
def self.from_data(data)
case data[:algo]
when ALGO_RSA
RSA.new(**data)
when ALGO_DSA
DSA.new(**data)
when ALGO_ECDSA256, ALGO_ECDSA384, ALGO_ECDSA521
ECDSA.new(**data)
when ALGO_ED25519
ED25519.new(**data)
when ALGO_SKED25519
SKED25519.new(**data)
when ALGO_SKECDSA256
SKECDSA.new(**data)
else
raise DecodeError, "unkown algo: #{data[:algo].inspect}"
end
end
end
end
require "ssh_data/public_key/base"
require "ssh_data/public_key/security_key"
require "ssh_data/public_key/rsa"
require "ssh_data/public_key/dsa"
require "ssh_data/public_key/ecdsa"
require "ssh_data/public_key/ed25519"
require "ssh_data/public_key/sked25519"
require "ssh_data/public_key/skecdsa"
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