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#--
# =============================================================================
# Copyright (c) 2004,2005 Jamis Buck (jamis@37signals.com)
# All rights reserved.
#
# This source file is distributed as part of the Net::SSH Secure Shell Client
# library for Ruby. This file (and the library as a whole) may be used only as
# allowed by either the BSD license, or the Ruby license (or, by association
# with the Ruby license, the GPL). See the "doc" subdirectory of the Net::SSH
# distribution for the texts of these licenses.
# -----------------------------------------------------------------------------
# net-ssh website : http://net-ssh.rubyforge.org
# project website: http://rubyforge.org/projects/net-ssh
# =============================================================================
#++
require 'openssl'
require 'net/ssh/util/buffer'
module Net
module SSH
module Transport
module OSSL
# The implementation of a reader buffer that can read bignums and keys.
module ReaderBufferImpl
# Read a bignum (OpenSSL::BN) from the buffer, in SSH2 format. It is
# essentially just a string, which is reinterpreted to be a bignum in
# binary format.
def read_bignum
data = read_string
return unless data
OpenSSL::BN.new( data, 2 )
end
# Read a key from the buffer. The key will start with a string
# describing its type. The remainder of the key is defined by the
# type that was read.
def read_key
type = read_string
return ( type ? read_keyblob( type ) : nil )
end
# Read a keyblob of the given type from the buffer, and return it as
# a key. Only RSA and DSA keys are supported.
def read_keyblob( type )
case type
when "ssh-dss"
key = OpenSSL::PKey::DSA.new
key.p = read_bignum
key.q = read_bignum
key.g = read_bignum
key.pub_key = read_bignum
when "ssh-rsa"
key = OpenSSL::PKey::RSA.new
key.e = read_bignum
key.n = read_bignum
else
raise NotImplementedError, "unsupported key type '#{type}'"
end
return key
end
end
# An extension of the standard ReaderBuffer implementation that also
# includes the ReaderBufferImpl module.
class ReaderBuffer < Net::SSH::Util::ReaderBuffer
include ReaderBufferImpl
end
# An extension of the standard general Buffer implementation that also
# includes the ReaderBufferImpl module.
class Buffer < Net::SSH::Util::Buffer
include ReaderBufferImpl
end
end
end
end
end
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