I tested the new Lua VM with an implementation of SHA-256, utilizing the upcoming bit32 library.
Using an input of 260 KB, this is how long it took to compute their hashes:
- Old Lua VM:
1.2972564697266 - New Lua VM:
0.17563724517822
These results are quite astonishing! I can’t wait for this to go live!
SHA-256 Implementation
This is just a cleaned up version of an implementation I found on GitHub Gist.
local band = bit32.band
local bnot = bit32.bnot
local bxor = bit32.bxor
local rrotate = bit32.rrotate
local rshift = bit32.rshift
local primes =
{
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
}
local function toHex(str)
local result = str:gsub('.', function (char)
return string.format("%02x", char:byte())
end)
return result
end
local function toBytes(value, length)
local str = ""
for i = 1, length do
local rem = value % 256
str = string.char(rem) .. str
value = (value - rem) / 256
end
return str
end
local function readInt32(buffer, index)
local value = 0
for i = index, index + 3 do
value = (value * 256) + string.byte(buffer, i)
end
return value
end
local function digestBlock(msg, i, hash)
local digest = {}
for j = 1, 16 do
digest[j] = readInt32(msg, i + (j - 1) * 4)
end
for j = 17, 64 do
local v = digest[j - 15]
local s0 = bxor(rrotate(v, 7), rrotate(v, 18), rshift(v, 3))
v = digest[j - 2]
digest[j] = digest[j - 16] + s0 + digest[j - 7] + bxor(rrotate(v, 17), rrotate(v, 19), rshift(v, 10))
end
local a, b, c, d, e, f, g, h = unpack(hash)
for i = 1, 64 do
local s0 = bxor(rrotate(a, 2), rrotate(a, 13), rrotate(a, 22))
local maj = bxor(band(a, b), band(a, c), band(b, c))
local t2 = s0 + maj
local s1 = bxor(rrotate(e, 6), rrotate(e, 11), rrotate(e, 25))
local ch = bxor(band(e, f), band(bnot(e), g))
local t1 = h + s1 + ch + primes[i] + digest[i]
h, g, f, e, d, c, b, a = g, f, e, d + t1, c, b, a, t1 + t2
end
hash[1] = band(hash[1] + a)
hash[2] = band(hash[2] + b)
hash[3] = band(hash[3] + c)
hash[4] = band(hash[4] + d)
hash[5] = band(hash[5] + e)
hash[6] = band(hash[6] + f)
hash[7] = band(hash[7] + g)
hash[8] = band(hash[8] + h)
end
local function sha256(msg)
do
local extra = 64 - ((#msg + 9) % 64)
local len = toBytes(8 * #msg, 8)
msg = msg .. '\128' .. string.rep('\0', extra) .. len
assert(#msg % 64 == 0)
end
local hash =
{
0x6a09e667,
0xbb67ae85,
0x3c6ef372,
0xa54ff53a,
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19,
}
for i = 1, #msg, 64 do
digestBlock(msg, i, hash)
end
local result = ""
for i = 1, 8 do
local value = hash[i]
result = result .. toBytes(value, 4)
end
return toHex(result)
end
------------------------------------------------------------------
local input = string.rep(".", 26e4)
local now = tick()
local result = sha256(input)
print(tick() - now)
print(result)
------------------------------------------------------------------
