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module Net
module SSH
module Transport
module KeyExpander
# Generate a key value in accordance with the SSH2 specification.
# (RFC4253 7.2. "Output from Key Exchange")
def self.expand_key(bytes, start, options={})
if bytes == 0
return ""
end
k = start[0, bytes]
return k if k.length >= bytes
digester = options[:digester] or raise 'No digester supplied'
shared = options[:shared] or raise 'No shared secret supplied'
hash = options[:hash] or raise 'No hash supplied'
while k.length < bytes
step = digester.digest(shared + hash + k)
bytes_needed = bytes - k.length
k << step[0, bytes_needed]
end
return k
end
end
end
end
end
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