# File lib/net/ssh/transport/packet_stream.rb, line 115
115:     def enqueue_packet(payload)
116:       # try to compress the packet
117:       payload = client.compress(payload)
118: 
119:       # the length of the packet, minus the padding
120:       actual_length = 4 + payload.length + 1
121: 
122:       # compute the padding length
123:       padding_length = client.block_size - (actual_length % client.block_size)
124:       padding_length += client.block_size if padding_length < 4
125: 
126:       # compute the packet length (sans the length field itself)
127:       packet_length = payload.length + padding_length + 1
128: 
129:       if packet_length < 16
130:         padding_length += client.block_size
131:         packet_length = payload.length + padding_length + 1
132:       end
133: 
134:       padding = Array.new(padding_length) { rand(256) }.pack("C*")
135: 
136:       unencrypted_data = [packet_length, padding_length, payload, padding].pack("NCA*A*")
137:       mac = client.hmac.digest([client.sequence_number, unencrypted_data].pack("NA*"))
138: 
139:       encrypted_data = client.update_cipher(unencrypted_data) << client.final_cipher
140:       message = encrypted_data + mac
141: 
142:       debug { "queueing packet nr #{client.sequence_number} type #{payload.getbyte(0)} len #{packet_length}" }
143:       enqueue(message)
144: 
145:       client.increment(packet_length)
146: 
147:       self
148:     end