mirror of
https://github.com/koreader/koreader
synced 2024-11-10 01:10:34 +00:00
78b098e47d
also get rid of mostly unused helper libraries and some stylistic oddities in the MD5 code
226 lines
7.3 KiB
Lua
226 lines
7.3 KiB
Lua
|
|
local ffi = require "ffi"
|
|
local bit = require "bit"
|
|
local bxor = bit.bxor
|
|
local bnot = bit.bnot
|
|
local band = bit.band
|
|
local bor = bit.bor
|
|
local rshift = bit.rshift
|
|
local lshift = bit.lshift
|
|
local copy = ffi.copy
|
|
local fill = ffi.fill
|
|
|
|
ffi.cdef[[
|
|
typedef struct MD5Context {
|
|
uint32_t buf[4];
|
|
uint32_t bits[2];
|
|
unsigned char input[64];
|
|
} MD5_CTX;
|
|
]]
|
|
|
|
local function byteReverse(buf, len)
|
|
-- TODO: implement for big-endian architectures?
|
|
end
|
|
|
|
local function F1(x, y, z) return bxor(z, band(x, bxor(y, z))) end
|
|
local function F2(x, y, z) return F1(z, x, y) end
|
|
local function F3(x, y, z) return bxor(x, y, z) end
|
|
local function F4(x, y, z) return bxor(y, bor(x, bnot(z))) end
|
|
|
|
local function MD5STEP(f, w, x, y, z, data, s)
|
|
w = w + f(x, y, z) + data
|
|
w = bor(lshift(w,s), rshift(w,(32-s)))
|
|
w = w + x
|
|
|
|
return w
|
|
end
|
|
|
|
-- Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
|
|
-- initialization constants.
|
|
local function MD5Init(ctx)
|
|
ctx.buf[0] = 0x67452301
|
|
ctx.buf[1] = 0xefcdab89
|
|
ctx.buf[2] = 0x98badcfe
|
|
ctx.buf[3] = 0x10325476
|
|
|
|
ctx.bits[0] = 0
|
|
ctx.bits[1] = 0
|
|
end
|
|
|
|
local function MD5Transform(buf, input)
|
|
local a = buf[0]
|
|
local b = buf[1]
|
|
local c = buf[2]
|
|
local d = buf[3]
|
|
|
|
a = MD5STEP(F1, a, b, c, d, input[0] + 0xd76aa478, 7)
|
|
d = MD5STEP(F1, d, a, b, c, input[1] + 0xe8c7b756, 12)
|
|
c = MD5STEP(F1, c, d, a, b, input[2] + 0x242070db, 17)
|
|
b = MD5STEP(F1, b, c, d, a, input[3] + 0xc1bdceee, 22)
|
|
a = MD5STEP(F1, a, b, c, d, input[4] + 0xf57c0faf, 7)
|
|
d = MD5STEP(F1, d, a, b, c, input[5] + 0x4787c62a, 12)
|
|
c = MD5STEP(F1, c, d, a, b, input[6] + 0xa8304613, 17)
|
|
b = MD5STEP(F1, b, c, d, a, input[7] + 0xfd469501, 22)
|
|
a = MD5STEP(F1, a, b, c, d, input[8] + 0x698098d8, 7)
|
|
d = MD5STEP(F1, d, a, b, c, input[9] + 0x8b44f7af, 12)
|
|
c = MD5STEP(F1, c, d, a, b, input[10] + 0xffff5bb1, 17)
|
|
b = MD5STEP(F1, b, c, d, a, input[11] + 0x895cd7be, 22)
|
|
a = MD5STEP(F1, a, b, c, d, input[12] + 0x6b901122, 7)
|
|
d = MD5STEP(F1, d, a, b, c, input[13] + 0xfd987193, 12)
|
|
c = MD5STEP(F1, c, d, a, b, input[14] + 0xa679438e, 17)
|
|
b = MD5STEP(F1, b, c, d, a, input[15] + 0x49b40821, 22)
|
|
|
|
a = MD5STEP(F2, a, b, c, d, input[1] + 0xf61e2562, 5)
|
|
d = MD5STEP(F2, d, a, b, c, input[6] + 0xc040b340, 9)
|
|
c = MD5STEP(F2, c, d, a, b, input[11] + 0x265e5a51, 14)
|
|
b = MD5STEP(F2, b, c, d, a, input[0] + 0xe9b6c7aa, 20)
|
|
a = MD5STEP(F2, a, b, c, d, input[5] + 0xd62f105d, 5)
|
|
d = MD5STEP(F2, d, a, b, c, input[10] + 0x02441453, 9)
|
|
c = MD5STEP(F2, c, d, a, b, input[15] + 0xd8a1e681, 14)
|
|
b = MD5STEP(F2, b, c, d, a, input[4] + 0xe7d3fbc8, 20)
|
|
a = MD5STEP(F2, a, b, c, d, input[9] + 0x21e1cde6, 5)
|
|
d = MD5STEP(F2, d, a, b, c, input[14] + 0xc33707d6, 9)
|
|
c = MD5STEP(F2, c, d, a, b, input[3] + 0xf4d50d87, 14)
|
|
b = MD5STEP(F2, b, c, d, a, input[8] + 0x455a14ed, 20)
|
|
a = MD5STEP(F2, a, b, c, d, input[13] + 0xa9e3e905, 5)
|
|
d = MD5STEP(F2, d, a, b, c, input[2] + 0xfcefa3f8, 9)
|
|
c = MD5STEP(F2, c, d, a, b, input[7] + 0x676f02d9, 14)
|
|
b = MD5STEP(F2, b, c, d, a, input[12] + 0x8d2a4c8a, 20)
|
|
|
|
a = MD5STEP(F3, a, b, c, d, input[5] + 0xfffa3942, 4)
|
|
d = MD5STEP(F3, d, a, b, c, input[8] + 0x8771f681, 11)
|
|
c = MD5STEP(F3, c, d, a, b, input[11] + 0x6d9d6122, 16)
|
|
b = MD5STEP(F3, b, c, d, a, input[14] + 0xfde5380c, 23)
|
|
a = MD5STEP(F3, a, b, c, d, input[1] + 0xa4beea44, 4)
|
|
d = MD5STEP(F3, d, a, b, c, input[4] + 0x4bdecfa9, 11)
|
|
c = MD5STEP(F3, c, d, a, b, input[7] + 0xf6bb4b60, 16)
|
|
b = MD5STEP(F3, b, c, d, a, input[10] + 0xbebfbc70, 23)
|
|
a = MD5STEP(F3, a, b, c, d, input[13] + 0x289b7ec6, 4)
|
|
d = MD5STEP(F3, d, a, b, c, input[0] + 0xeaa127fa, 11)
|
|
c = MD5STEP(F3, c, d, a, b, input[3] + 0xd4ef3085, 16)
|
|
b = MD5STEP(F3, b, c, d, a, input[6] + 0x04881d05, 23)
|
|
a = MD5STEP(F3, a, b, c, d, input[9] + 0xd9d4d039, 4)
|
|
d = MD5STEP(F3, d, a, b, c, input[12] + 0xe6db99e5, 11)
|
|
c = MD5STEP(F3, c, d, a, b, input[15] + 0x1fa27cf8, 16)
|
|
b = MD5STEP(F3, b, c, d, a, input[2] + 0xc4ac5665, 23)
|
|
|
|
a = MD5STEP(F4, a, b, c, d, input[0] + 0xf4292244, 6)
|
|
d = MD5STEP(F4, d, a, b, c, input[7] + 0x432aff97, 10)
|
|
c = MD5STEP(F4, c, d, a, b, input[14] + 0xab9423a7, 15)
|
|
b = MD5STEP(F4, b, c, d, a, input[5] + 0xfc93a039, 21)
|
|
a = MD5STEP(F4, a, b, c, d, input[12] + 0x655b59c3, 6)
|
|
d = MD5STEP(F4, d, a, b, c, input[3] + 0x8f0ccc92, 10)
|
|
c = MD5STEP(F4, c, d, a, b, input[10] + 0xffeff47d, 15)
|
|
b = MD5STEP(F4, b, c, d, a, input[1] + 0x85845dd1, 21)
|
|
a = MD5STEP(F4, a, b, c, d, input[8] + 0x6fa87e4f, 6)
|
|
d = MD5STEP(F4, d, a, b, c, input[15] + 0xfe2ce6e0, 10)
|
|
c = MD5STEP(F4, c, d, a, b, input[6] + 0xa3014314, 15)
|
|
b = MD5STEP(F4, b, c, d, a, input[13] + 0x4e0811a1, 21)
|
|
a = MD5STEP(F4, a, b, c, d, input[4] + 0xf7537e82, 6)
|
|
d = MD5STEP(F4, d, a, b, c, input[11] + 0xbd3af235, 10)
|
|
c = MD5STEP(F4, c, d, a, b, input[2] + 0x2ad7d2bb, 15)
|
|
b = MD5STEP(F4, b, c, d, a, input[9] + 0xeb86d391, 21)
|
|
|
|
buf[0] = band(buf[0] + a, 0xFFFFFFFF)
|
|
buf[1] = band(buf[1] + b, 0xFFFFFFFF)
|
|
buf[2] = band(buf[2] + c, 0xFFFFFFFF)
|
|
buf[3] = band(buf[3] + d, 0xFFFFFFFF)
|
|
end
|
|
|
|
local function MD5Update(ctx, buf, len)
|
|
local t
|
|
|
|
t = ctx.bits[0]
|
|
ctx.bits[0] = t + lshift( len, 3)
|
|
if (ctx.bits[0] < t) then
|
|
ctx.bits[1] = ctx.bits[1] + 1
|
|
end
|
|
|
|
ctx.bits[1] = ctx.bits[1] + rshift(len, 29)
|
|
|
|
t = band(rshift(t, 3), 0x3f)
|
|
|
|
if (t > 0) then
|
|
p = ffi.cast("unsigned char *", ctx.input + t)
|
|
|
|
t = 64 - t
|
|
if (len < t) then
|
|
copy(p, buf, len)
|
|
return
|
|
end
|
|
|
|
copy(p, buf, t)
|
|
byteReverse(ctx.input, 16)
|
|
MD5Transform(ctx.buf, ffi.cast("uint32_t *", ctx.input))
|
|
buf = buf + t
|
|
len = len - t
|
|
end
|
|
|
|
while (len >= 64) do
|
|
copy(ctx.input, buf, 64)
|
|
byteReverse(ctx.input, 16)
|
|
MD5Transform(ctx.buf, ffi.cast("uint32_t *", ctx.input))
|
|
buf = buf + 64
|
|
len = len - 64
|
|
end
|
|
|
|
copy(ctx.input, buf, len)
|
|
end
|
|
|
|
local function MD5Final(digest, ctx)
|
|
|
|
local count
|
|
local p
|
|
|
|
count = band(rshift(ctx.bits[0], 3), 0x3F)
|
|
|
|
p = ctx.input + count
|
|
p[0] = 0x80
|
|
p = p + 1
|
|
count = 64 - 1 - count
|
|
|
|
if (count < 8) then
|
|
fill(p, count, 0)
|
|
byteReverse(ctx.input, 16)
|
|
MD5Transform(ctx.buf, ffi.cast("uint32_t *", ctx.input))
|
|
fill(ctx.input, 56, 0)
|
|
else
|
|
fill(p, count - 8, 0)
|
|
end
|
|
|
|
byteReverse(ctx.input, 14)
|
|
|
|
ffi.cast("uint32_t *", ctx.input)[14] = ctx.bits[0]
|
|
ffi.cast("uint32_t *", ctx.input)[15] = ctx.bits[1]
|
|
|
|
MD5Transform(ctx.buf, ffi.cast("uint32_t *", ctx.input))
|
|
byteReverse(ffi.cast("unsigned char *",ctx.buf), 4)
|
|
copy(digest, ctx.buf, 16)
|
|
fill(ffi.cast("char *", ctx), ffi.sizeof(ctx), 0)
|
|
end
|
|
|
|
local hex = ffi.new("const char[16]", "0123456789abcdef")
|
|
local function bin2str(output, input, len)
|
|
if len > 0 then
|
|
output[0] = hex[rshift(input[0], 4)]
|
|
output[1] = hex[band(input[0], 0xF)]
|
|
return bin2str(output+2, input+1, len-1)
|
|
end
|
|
end
|
|
|
|
local function md5(luastr)
|
|
local buf = ffi.new("char[33]")
|
|
local hash = ffi.new("uint8_t[16]")
|
|
local ctx = ffi.new("MD5_CTX")
|
|
|
|
MD5Init(ctx)
|
|
MD5Update(ctx, ffi.cast("const char*", luastr), #luastr)
|
|
MD5Final(hash, ctx)
|
|
|
|
bin2str(buf, hash, ffi.sizeof(hash))
|
|
|
|
return ffi.string(buf)
|
|
end
|
|
|
|
return md5
|