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Convert bit ops to native

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dmiller
2017-10-19 02:42:55 +00:00
parent 04ba104f93
commit a86d6eebc3
1 changed files with 8 additions and 9 deletions
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17
nselib/ssh1.lua
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@@ -7,7 +7,6 @@
local bin = require "bin"
local bit = require "bit"
local io = require "io"
local math = require "math"
local nmap = require "nmap"
@@ -137,14 +136,14 @@ fingerprint_bubblebabble = function( fingerprint, algorithm, bits )
local in1,in2,idx1,idx2,idx3,idx4,idx5
if i < #fingerprint or #fingerprint / 2 % 2 ~= 0 then
in1 = fingerprint:byte(i)
idx1 = (bit.band(bit.rshift(in1,6),3) + seed) % 6 + 1
idx2 = bit.band(bit.rshift(in1,2),15) + 1
idx3 = (bit.band(in1,3) + math.floor(seed/6)) % 6 + 1
idx1 = (((in1 >> 6) & 3) + seed) % 6 + 1
idx2 = ((in1 >> 2) & 15) + 1
idx3 = ((in1 & 3) + math.floor(seed/6)) % 6 + 1
s = s .. vowels[idx1] .. consonants[idx2] .. vowels[idx3]
if i < #fingerprint then
in2 = fingerprint:byte(i+1)
idx4 = bit.band(bit.rshift(in2,4),15) + 1
idx5 = bit.band(in2,15) + 1
idx4 = ((in2 >> 4) & 15) + 1
idx5 = (in2 & 15) + 1
s = s .. consonants[idx4] .. '-' .. consonants[idx5]
seed = (seed * 5 + in1 * 7 + in2) % 36
end
@@ -186,8 +185,8 @@ fingerprint_visual = function( fingerprint, algorithm, bits )
input = fingerprint:byte(i)
-- each byte conveys four 2-bit move commands
for j=1,4 do
if bit.band( input, 1) == 1 then x = x + 1 else x = x - 1 end
if bit.band( input, 2) == 2 then y = y + 1 else y = y - 1 end
if (input & 1) == 1 then x = x + 1 else x = x - 1 end
if (input & 2) == 2 then y = y + 1 else y = y - 1 end
x = math.max(x,1); x = math.min(x,fieldsize_x)
y = math.max(y,1); y = math.min(y,fieldsize_y)
@@ -195,7 +194,7 @@ fingerprint_visual = function( fingerprint, algorithm, bits )
if field[x][y] < #characters - 2 then
field[x][y] = field[x][y] + 1
end
input = bit.rshift( input, 2 )
input = input >> 2
end
end