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Review md5 and sha1 Lua implementation
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@javalikescript
javalikescript committed Feb 3, 2024
1 parent c13a479 commit 9ec1391
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236 changes: 111 additions & 125 deletions jls/util/md/md5-.lua
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Original file line number Diff line number Diff line change
@@ -1,49 +1,42 @@
local char, byte, format, rep, sub = string.char, string.byte, string.format, string.rep, string.sub
-- from https://github.com/kikito/md5.lua

local function bit_not(n)
return ~n
end
--[[
MIT LICENSE
local function bit_or(m, n)
return m | n
end
Copyright (c) 2013 Enrique García Cota + Adam Baldwin + hanzao + Equi 4 Software
local function bit_and(m, n)
return m & n
end
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
local function bit_xor(m, n)
return m ~ n
end
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
local function bit_rshift(n, bits)
return n >> bits
end
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
]]

local function bit_lshift(n, bits)
return n << bits
end
local char, byte, rep, sub = string.char, string.byte, string.rep, string.sub

-- convert little-endian 32-bit int to a 4-char string
local function lei2str(i)
local f=function (s) return char( bit_and( bit_rshift(i, s), 255)) end
return f(0)..f(8)..f(16)..f(24)
end

-- convert raw string to big-endian int
local function str2bei(s)
local v=0
for i=1, #s do
v = v * 256 + byte(s, i)
end
return v
return char(i & 255, (i >> 8) & 255, (i >> 16) & 255, (i >> 24) & 255)
end

-- convert raw string to little-endian int
local function str2lei(s)
local v=0
for i = #s,1,-1 do
v = v*256 + byte(s, i)
local v = 0
for i = #s, 1, -1 do
v = (v * 256) + byte(s, i)
end
return v
end
Expand All @@ -59,14 +52,6 @@ local function cut_le_str(s, ...)
return r
end

local function swap(w)
return str2bei(lei2str(w))
end

-- An MD5 implementation in Lua
-- 10/02/2001 jcw@equi4.com
-- see https://github.com/kikito/md5.lua/blob/master/md5.lua

local CONSTS = {
0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
Expand All @@ -87,90 +72,91 @@ local CONSTS = {
0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476
}

local f=function (x,y,z) return bit_or(bit_and(x,y),bit_and(-x-1,z)) end
local g=function (x,y,z) return bit_or(bit_and(x,z),bit_and(y,-z-1)) end
local h=function (x,y,z) return bit_xor(x,bit_xor(y,z)) end
local i=function (x,y,z) return bit_xor(y,bit_or(x,-z-1)) end
local z=function (ff,a,b,c,d,x,s,ac)
a=bit_and(a+ff(b,c,d)+x+ac,0xFFFFFFFF)
local f = function(x, y, z)
return (x & y) | ((-x - 1) & z)
end
local g = function(x, y, z)
return (x & z) | (y & (-z - 1))
end
local h = function(x, y, z)
return x ~ (y ~ z)
end
local i = function(x, y, z)
return y ~ (x | (-z - 1))
end
local z = function(ff, a, b, c, d, x, s, ac)
a = (a + ff(b, c, d) + x + ac) & 0xFFFFFFFF
-- be *very* careful that left shift does not cause rounding!
return bit_or(bit_lshift(bit_and(a,bit_rshift(0xFFFFFFFF,s)),s),bit_rshift(a,32-s))+b
return (((a & (0xFFFFFFFF >> s)) << s) | (a >> (32 - s))) + b
end

local function transform(A,B,C,D,X)
local a,b,c,d=A,B,C,D
local t=CONSTS

a=z(f,a,b,c,d,X[ 0], 7,t[ 1])
d=z(f,d,a,b,c,X[ 1],12,t[ 2])
c=z(f,c,d,a,b,X[ 2],17,t[ 3])
b=z(f,b,c,d,a,X[ 3],22,t[ 4])
a=z(f,a,b,c,d,X[ 4], 7,t[ 5])
d=z(f,d,a,b,c,X[ 5],12,t[ 6])
c=z(f,c,d,a,b,X[ 6],17,t[ 7])
b=z(f,b,c,d,a,X[ 7],22,t[ 8])
a=z(f,a,b,c,d,X[ 8], 7,t[ 9])
d=z(f,d,a,b,c,X[ 9],12,t[10])
c=z(f,c,d,a,b,X[10],17,t[11])
b=z(f,b,c,d,a,X[11],22,t[12])
a=z(f,a,b,c,d,X[12], 7,t[13])
d=z(f,d,a,b,c,X[13],12,t[14])
c=z(f,c,d,a,b,X[14],17,t[15])
b=z(f,b,c,d,a,X[15],22,t[16])

a=z(g,a,b,c,d,X[ 1], 5,t[17])
d=z(g,d,a,b,c,X[ 6], 9,t[18])
c=z(g,c,d,a,b,X[11],14,t[19])
b=z(g,b,c,d,a,X[ 0],20,t[20])
a=z(g,a,b,c,d,X[ 5], 5,t[21])
d=z(g,d,a,b,c,X[10], 9,t[22])
c=z(g,c,d,a,b,X[15],14,t[23])
b=z(g,b,c,d,a,X[ 4],20,t[24])
a=z(g,a,b,c,d,X[ 9], 5,t[25])
d=z(g,d,a,b,c,X[14], 9,t[26])
c=z(g,c,d,a,b,X[ 3],14,t[27])
b=z(g,b,c,d,a,X[ 8],20,t[28])
a=z(g,a,b,c,d,X[13], 5,t[29])
d=z(g,d,a,b,c,X[ 2], 9,t[30])
c=z(g,c,d,a,b,X[ 7],14,t[31])
b=z(g,b,c,d,a,X[12],20,t[32])

a=z(h,a,b,c,d,X[ 5], 4,t[33])
d=z(h,d,a,b,c,X[ 8],11,t[34])
c=z(h,c,d,a,b,X[11],16,t[35])
b=z(h,b,c,d,a,X[14],23,t[36])
a=z(h,a,b,c,d,X[ 1], 4,t[37])
d=z(h,d,a,b,c,X[ 4],11,t[38])
c=z(h,c,d,a,b,X[ 7],16,t[39])
b=z(h,b,c,d,a,X[10],23,t[40])
a=z(h,a,b,c,d,X[13], 4,t[41])
d=z(h,d,a,b,c,X[ 0],11,t[42])
c=z(h,c,d,a,b,X[ 3],16,t[43])
b=z(h,b,c,d,a,X[ 6],23,t[44])
a=z(h,a,b,c,d,X[ 9], 4,t[45])
d=z(h,d,a,b,c,X[12],11,t[46])
c=z(h,c,d,a,b,X[15],16,t[47])
b=z(h,b,c,d,a,X[ 2],23,t[48])

a=z(i,a,b,c,d,X[ 0], 6,t[49])
d=z(i,d,a,b,c,X[ 7],10,t[50])
c=z(i,c,d,a,b,X[14],15,t[51])
b=z(i,b,c,d,a,X[ 5],21,t[52])
a=z(i,a,b,c,d,X[12], 6,t[53])
d=z(i,d,a,b,c,X[ 3],10,t[54])
c=z(i,c,d,a,b,X[10],15,t[55])
b=z(i,b,c,d,a,X[ 1],21,t[56])
a=z(i,a,b,c,d,X[ 8], 6,t[57])
d=z(i,d,a,b,c,X[15],10,t[58])
c=z(i,c,d,a,b,X[ 6],15,t[59])
b=z(i,b,c,d,a,X[13],21,t[60])
a=z(i,a,b,c,d,X[ 4], 6,t[61])
d=z(i,d,a,b,c,X[11],10,t[62])
c=z(i,c,d,a,b,X[ 2],15,t[63])
b=z(i,b,c,d,a,X[ 9],21,t[64])

return bit_and(A+a,0xFFFFFFFF),bit_and(B+b,0xFFFFFFFF),
bit_and(C+c,0xFFFFFFFF),bit_and(D+d,0xFFFFFFFF)
local function transform(A, B, C, D, X)
local a, b, c, d = A, B, C, D
local t = CONSTS
a = z(f, a, b, c, d, X[0], 7, t[1])
d = z(f, d, a, b, c, X[1], 12, t[2])
c = z(f, c, d, a, b, X[2], 17, t[3])
b = z(f, b, c, d, a, X[3], 22, t[4])
a = z(f, a, b, c, d, X[4], 7, t[5])
d = z(f, d, a, b, c, X[5], 12, t[6])
c = z(f, c, d, a, b, X[6], 17, t[7])
b = z(f, b, c, d, a, X[7], 22, t[8])
a = z(f, a, b, c, d, X[8], 7, t[9])
d = z(f, d, a, b, c, X[9], 12, t[10])
c = z(f, c, d, a, b, X[10], 17, t[11])
b = z(f, b, c, d, a, X[11], 22, t[12])
a = z(f, a, b, c, d, X[12], 7, t[13])
d = z(f, d, a, b, c, X[13], 12, t[14])
c = z(f, c, d, a, b, X[14], 17, t[15])
b = z(f, b, c, d, a, X[15], 22, t[16])
a = z(g, a, b, c, d, X[1], 5, t[17])
d = z(g, d, a, b, c, X[6], 9, t[18])
c = z(g, c, d, a, b, X[11], 14, t[19])
b = z(g, b, c, d, a, X[0], 20, t[20])
a = z(g, a, b, c, d, X[5], 5, t[21])
d = z(g, d, a, b, c, X[10], 9, t[22])
c = z(g, c, d, a, b, X[15], 14, t[23])
b = z(g, b, c, d, a, X[4], 20, t[24])
a = z(g, a, b, c, d, X[9], 5, t[25])
d = z(g, d, a, b, c, X[14], 9, t[26])
c = z(g, c, d, a, b, X[3], 14, t[27])
b = z(g, b, c, d, a, X[8], 20, t[28])
a = z(g, a, b, c, d, X[13], 5, t[29])
d = z(g, d, a, b, c, X[2], 9, t[30])
c = z(g, c, d, a, b, X[7], 14, t[31])
b = z(g, b, c, d, a, X[12], 20, t[32])
a = z(h, a, b, c, d, X[5], 4, t[33])
d = z(h, d, a, b, c, X[8], 11, t[34])
c = z(h, c, d, a, b, X[11], 16, t[35])
b = z(h, b, c, d, a, X[14], 23, t[36])
a = z(h, a, b, c, d, X[1], 4, t[37])
d = z(h, d, a, b, c, X[4], 11, t[38])
c = z(h, c, d, a, b, X[7], 16, t[39])
b = z(h, b, c, d, a, X[10], 23, t[40])
a = z(h, a, b, c, d, X[13], 4, t[41])
d = z(h, d, a, b, c, X[0], 11, t[42])
c = z(h, c, d, a, b, X[3], 16, t[43])
b = z(h, b, c, d, a, X[6], 23, t[44])
a = z(h, a, b, c, d, X[9], 4, t[45])
d = z(h, d, a, b, c, X[12], 11, t[46])
c = z(h, c, d, a, b, X[15], 16, t[47])
b = z(h, b, c, d, a, X[2], 23, t[48])
a = z(i, a, b, c, d, X[0], 6, t[49])
d = z(i, d, a, b, c, X[7], 10, t[50])
c = z(i, c, d, a, b, X[14], 15, t[51])
b = z(i, b, c, d, a, X[5], 21, t[52])
a = z(i, a, b, c, d, X[12], 6, t[53])
d = z(i, d, a, b, c, X[3], 10, t[54])
c = z(i, c, d, a, b, X[10], 15, t[55])
b = z(i, b, c, d, a, X[1], 21, t[56])
a = z(i, a, b, c, d, X[8], 6, t[57])
d = z(i, d, a, b, c, X[15], 10, t[58])
c = z(i, c, d, a, b, X[6], 15, t[59])
b = z(i, b, c, d, a, X[13], 21, t[60])
a = z(i, a, b, c, d, X[4], 6, t[61])
d = z(i, d, a, b, c, X[11], 10, t[62])
c = z(i, c, d, a, b, X[2], 15, t[63])
b = z(i, b, c, d, a, X[9], 21, t[64])
return (A + a) & 0xFFFFFFFF, (B + b) & 0xFFFFFFFF, (C + c) & 0xFFFFFFFF, (D + d) & 0xFFFFFFFF
end

return require('jls.lang.class').create('jls.util.MessageDigest', function(md5)
Expand All @@ -183,7 +169,7 @@ return require('jls.lang.class').create('jls.util.MessageDigest', function(md5)
self.pos = self.pos + #s
s = self.buf .. s
for ii = 1, #s - 63, 64 do
local X = cut_le_str(sub(s,ii,ii+63),4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4)
local X = cut_le_str(sub(s, ii, ii + 63), 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4)
assert(#X == 16)
X[0] = table.remove(X,1) -- zero based!
self.a,self.b,self.c,self.d = transform(self.a,self.b,self.c,self.d,X)
Expand All @@ -200,7 +186,7 @@ return require('jls.lang.class').create('jls.util.MessageDigest', function(md5)

if padLen == 0 then padLen = 64 end

local s = char(128) .. rep(char(0),padLen-1) .. lei2str(bit_and(8*msgLen, 0xFFFFFFFF)) .. lei2str(math.floor(msgLen/0x20000000))
local s = char(128) .. rep(char(0),padLen-1) .. lei2str((8*msgLen) & 0xFFFFFFFF) .. lei2str(math.floor(msgLen/0x20000000))
self:update(s)

assert(self.pos % 64 == 0)
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