-- Implementação da Criptografia MD5 em Lua
local bin = { }
function bin.imod(a, b)
return a - math.floor(a / b) * b
end
function bin.rshift(a, b)
if (a < 0) then
a = 4294967296 + a
end
if (b < 0) then
b = 4294967296 + b
end
a = bin.imod(a, 4294967296)
b = bin.imod(b, 4294967296)
return math.floor(a / (2 ^ b))
end
function bin.lshift(a, b)
if (a < 0) then
a = 4294967296 + a
end
if (b < 0) then
b = 4294967296 + b
end
a = bin.imod(a, 4294967296)
b = bin.imod(b, 4294967296)
return math.floor(a * (2 ^ b))
end
function bin.band(a, b)
local i, v, r, b1, b2
if (a < 0) then
a = 4294967296 + a
end
if (b < 0) then
b = 4294967296 + b
end
a = bin.imod(a, 4294967296)
b = bin.imod(b, 4294967296)
r = 0
for i = 31, 0, -1 do
v = 2 ^ i
b1 = a >= v
b2 = b >= v
if (b1) and (b2) then
r = r + v
end
if (b1) then
a = a - v
end
if (b2) then
b = b - v
end
end
return r
end
function bin.bor(a, b)
local i, v, r, b1, b2
if (a < 0) then
a = 4294967296 + a
end
if (b < 0) then
b = 4294967296 + b
end
a = bin.imod(a, 4294967296)
b = bin.imod(b, 4294967296)
r = 0
for i = 31, 0, -1 do
v = 2 ^ i
b1 = a >= v
b2 = b >= v
if (b1) or (b2) then
r = r + v
end
if (b1) then
a = a - v
end
if (b2) then
b = b - v
end
end
return r
end
function bin.bxor(a, b)
local i, v, r, b1, b2
if (a < 0) then
a = 4294967296 + a
end
if (b < 0) then
b = 4294967296 + b
end
a = bin.imod(a, 4294967296)
b = bin.imod(b, 4294967296)
r = 0
for i = 31, 0, -1 do
v = 2 ^ i
b1 = a >= v
b2 = b >= v
if (b1 ~= b2) then
r = r + v
end
if (b1) then
a = a - v
end
if (b2) then
b = b - v
end
end
return r
end
function bin.bnot(a)
local i, v, r, b
if (a < 0) then
a = 4294967296 + a
end
a = bin.imod(a, 4294967296)
r = 0
for i = 31, 0, -1 do
v = 2 ^ i
b = a >= v
if (b) then
a = a - v
else
r = r + v
end
end
return r
end
local X
local md5={ff=tonumber('ffffffff',16),consts={}}
string.gsub([[
d76aa478 e8c7b756 242070db c1bdceee
f57c0faf 4787c62a a8304613 fd469501
698098d8 8b44f7af ffff5bb1 895cd7be
6b901122 fd987193 a679438e 49b40821
f61e2562 c040b340 265e5a51 e9b6c7aa
d62f105d 02441453 d8a1e681 e7d3fbc8
21e1cde6 c33707d6 f4d50d87 455a14ed
a9e3e905 fcefa3f8 676f02d9 8d2a4c8a
fffa3942 8771f681 6d9d6122 fde5380c
a4beea44 4bdecfa9 f6bb4b60 bebfbc70
289b7ec6 eaa127fa d4ef3085 04881d05
d9d4d039 e6db99e5 1fa27cf8 c4ac5665
f4292244 432aff97 ab9423a7 fc93a039
655b59c3 8f0ccc92 ffeff47d 85845dd1
6fa87e4f fe2ce6e0 a3014314 4e0811a1
f7537e82 bd3af235 2ad7d2bb eb86d391
67452301 efcdab89 98badcfe 10325476 ]],
'(%w+)', function (s) table.insert(md5.consts,tonumber(s,16)) end)
function md5.transform(A,B,C,D)
local f=function (x,y,z) return bin.bor(bin.band(x,y),bin.band(-x-1,z)) end
local g=function (x,y,z) return bin.bor(bin.band(x,z),bin.band(y,-z-1)) end
local h=function (x,y,z) return bin.bxor(x,bin.bxor(y,z)) end
local i=function (x,y,z) return bin.bxor(y,bin.bor(x,-z-1)) end
local z=function (f,a,b,c,d,x,s,ac)
a=bin.band(a+f(b,c,d)+x+ac,md5.ff)
-- be *very* careful that left shift does not cause rounding!
return bin.bor(bin.lshift(bin.band(a,bin.rshift(md5.ff,s)),s),bin.rshift(a,32-s))+b
end
local a,b,c,d=A,B,C,D
local t=md5.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,B+b,C+c,D+d
end
function md5.Calc(s)
local msgLen=string.len(s)
local padLen=56-bin.imod(msgLen,64)
if bin.imod(msgLen,64)>56 then padLen=padLen+64 end
if padLen==0 then padLen=64 end
s=s..string.char(128)..string.rep(string.char(0),padLen-1)
s=s..leIstr(8*msgLen)..leIstr(0)
assert(bin.imod(string.len(s),64)==0)
local t=md5.consts
local a,b,c,d=t[65],t[66],t[67],t[68]
for i=1,string.len(s),64 do
X=leStrCuts(string.sub(s,i,i+63),4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4)
assert(table.getn(X)==16)
X[0]=table.remove(X,1) -- zero based!
a,b,c,d=md5.transform(a,b,c,d)
end
local swap=function (w) return beInt(leIstr(w)) end
return string.format("%08x%08x%08x%08x",swap(a),swap(b),swap(c),swap(d))
end
-- convert little-endian 32-bit int to a 4-char string
function leIstr(i)
local f=function (s) return string.char(bin.band(bin.rshift(i,s),255)) end
return f(0)..f(8)..f(16)..f(24)
end
-- convert raw string to big-endian int
function beInt(s)
local v=0
for i=1,string.len(s) do v=v*256+string.byte(s,i) end
return v
end
-- convert raw string to little-endian int
function leInt(s)
local v=0
for i=string.len(s),1,-1 do v=v*256+string.byte(s,i) end
return v
end
-- cut up a string in little-endian ints of given size
function leStrCuts(s,...)
local o,r=1,{}
for i=1,table.getn(arg) do
table.insert(r,leInt(string.sub(s,o,o+arg[i]-1)))
o=o+arg[i]
end
return r
end
function md5.dochecks()
s0='message digest'
s1='abcdefghijklmnopqrstuvwxyz'
s2='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
s3='1234567890123456789012345678901234567890'
..'1234567890123456789012345678901234567890'
assert(md5.Calc('')=='d41d8cd98f00b204e9800998ecf8427e')
assert(md5.Calc('a')=='0cc175b9c0f1b6a831c399e269772661')
assert(md5.Calc('abc')=='900150983cd24fb0d6963f7d28e17f72')
assert(md5.Calc(s0)=='f96b697d7cb7938d525a2f31aaf161d0')
assert(md5.Calc(s1)=='c3fcd3d76192e4007dfb496cca67e13b')
assert(md5.Calc(s2)=='d174ab98d277d9f5a5611c2c9f419d9f')
assert(md5.Calc(s3)=='57edf4a22be3c955ac49da2e2107b67a')
end
--md5.dochecks()
--print(md5.Calc('abc')) --900150983cd24fb0d6963f7d28e17f72
--print(md5.Calc('luis')) --502ff82f7f1f8218dd41201fe4353687
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