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1
--  
2
--  Adaptation of the Secure Hashing Algorithm (SHA-244/256)
3
--  Found Here: http://lua-users.org/wiki/SecureHashAlgorithm
4
--  
5
--  Using an adapted version of the bit library
6
--  Found Here: https://bitbucket.org/Boolsheet/bslf/src/1ee664885805/bit.lua
7
--  
8
--  Adapted into a single function by GravityScore
9
--  
10-
local MOD = 2^32
10+
11-
local MODM = MOD-1
11+
12
	local function band(int1, int2, int3, ...)
13-
local function memoize(f)
13+
		local ret =
14-
	local mt = {}
14+
		((int1%0x00000002>=0x00000001 and int2%0x00000002>=0x00000001 and 0x00000001) or 0)+
15-
	local t = setmetatable({}, mt)
15+
		((int1%0x00000004>=0x00000002 and int2%0x00000004>=0x00000002 and 0x00000002) or 0)+
16-
	function mt:__index(k)
16+
		((int1%0x00000008>=0x00000004 and int2%0x00000008>=0x00000004 and 0x00000004) or 0)+
17-
		local v = f(k)
17+
		((int1%0x00000010>=0x00000008 and int2%0x00000010>=0x00000008 and 0x00000008) or 0)+
18-
		t[k] = v
18+
		((int1%0x00000020>=0x00000010 and int2%0x00000020>=0x00000010 and 0x00000010) or 0)+
19-
		return v
19+
		((int1%0x00000040>=0x00000020 and int2%0x00000040>=0x00000020 and 0x00000020) or 0)+
20
		((int1%0x00000080>=0x00000040 and int2%0x00000080>=0x00000040 and 0x00000040) or 0)+
21-
	return t
21+
		((int1%0x00000100>=0x00000080 and int2%0x00000100>=0x00000080 and 0x00000080) or 0)+
22-
end
22+
		((int1%0x00000200>=0x00000100 and int2%0x00000200>=0x00000100 and 0x00000100) or 0)+
23
		((int1%0x00000400>=0x00000200 and int2%0x00000400>=0x00000200 and 0x00000200) or 0)+
24-
local function make_bitop_uncached(t, m)
24+
		((int1%0x00000800>=0x00000400 and int2%0x00000800>=0x00000400 and 0x00000400) or 0)+
25-
	local function bitop(a, b)
25+
		((int1%0x00001000>=0x00000800 and int2%0x00001000>=0x00000800 and 0x00000800) or 0)+
26-
		local res,p = 0,1
26+
		((int1%0x00002000>=0x00001000 and int2%0x00002000>=0x00001000 and 0x00001000) or 0)+
27-
		while a ~= 0 and b ~= 0 do
27+
		((int1%0x00004000>=0x00002000 and int2%0x00004000>=0x00002000 and 0x00002000) or 0)+
28-
			local am, bm = a % m, b % m
28+
		((int1%0x00008000>=0x00004000 and int2%0x00008000>=0x00004000 and 0x00004000) or 0)+
29-
			res = res + t[am][bm] * p
29+
		((int1%0x00010000>=0x00008000 and int2%0x00010000>=0x00008000 and 0x00008000) or 0)+
30-
			a = (a - am) / m
30+
		((int1%0x00020000>=0x00010000 and int2%0x00020000>=0x00010000 and 0x00010000) or 0)+
31-
			b = (b - bm) / m
31+
		((int1%0x00040000>=0x00020000 and int2%0x00040000>=0x00020000 and 0x00020000) or 0)+
32-
			p = p*m
32+
		((int1%0x00080000>=0x00040000 and int2%0x00080000>=0x00040000 and 0x00040000) or 0)+
33
		((int1%0x00100000>=0x00080000 and int2%0x00100000>=0x00080000 and 0x00080000) or 0)+
34-
		res = res + (a + b) * p
34+
		((int1%0x00200000>=0x00100000 and int2%0x00200000>=0x00100000 and 0x00100000) or 0)+
35-
		return res
35+
		((int1%0x00400000>=0x00200000 and int2%0x00400000>=0x00200000 and 0x00200000) or 0)+
36
		((int1%0x00800000>=0x00400000 and int2%0x00800000>=0x00400000 and 0x00400000) or 0)+
37-
	return bitop
37+
		((int1%0x01000000>=0x00800000 and int2%0x01000000>=0x00800000 and 0x00800000) or 0)+
38-
end
38+
		((int1%0x02000000>=0x01000000 and int2%0x02000000>=0x01000000 and 0x01000000) or 0)+
39
		((int1%0x04000000>=0x02000000 and int2%0x04000000>=0x02000000 and 0x02000000) or 0)+
40-
local function make_bitop(t)
40+
		((int1%0x08000000>=0x04000000 and int2%0x08000000>=0x04000000 and 0x04000000) or 0)+
41-
	local op1 = make_bitop_uncached(t,2^1)
41+
		((int1%0x10000000>=0x08000000 and int2%0x10000000>=0x08000000 and 0x08000000) or 0)+
42-
	local op2 = memoize(function(a) return memoize(function(b) return op1(a, b) end) end)
42+
		((int1%0x20000000>=0x10000000 and int2%0x20000000>=0x10000000 and 0x10000000) or 0)+
43-
	return make_bitop_uncached(op2, 2 ^ (t.n or 1))
43+
		((int1%0x40000000>=0x20000000 and int2%0x40000000>=0x20000000 and 0x20000000) or 0)+
44-
end
44+
		((int1%0x80000000>=0x40000000 and int2%0x80000000>=0x40000000 and 0x40000000) or 0)+
45
		((int1>=0x80000000 and int2>=0x80000000 and 0x80000000) or 0)
46-
local bxor1 = make_bitop({[0] = {[0] = 0,[1] = 1}, [1] = {[0] = 1, [1] = 0}, n = 4})
46+
47
		return (int3 and band(ret, int3, ...)) or ret
48-
local function bxor(a, b, c, ...)
48+
49-
	local z = nil
49+
50-
	if b then
50+
	local function bxor(int1, int2, int3, ...)
51-
		a = a % MOD
51+
		local ret =
52-
		b = b % MOD
52+
		((int1%0x00000002>=0x00000001 ~= (int2%0x00000002>=0x00000001) and 0x00000001) or 0)+
53-
		z = bxor1(a, b)
53+
		((int1%0x00000004>=0x00000002 ~= (int2%0x00000004>=0x00000002) and 0x00000002) or 0)+
54-
		if c then z = bxor(z, c, ...) end
54+
		((int1%0x00000008>=0x00000004 ~= (int2%0x00000008>=0x00000004) and 0x00000004) or 0)+
55-
		return z
55+
		((int1%0x00000010>=0x00000008 ~= (int2%0x00000010>=0x00000008) and 0x00000008) or 0)+
56-
	elseif a then return a % MOD
56+
		((int1%0x00000020>=0x00000010 ~= (int2%0x00000020>=0x00000010) and 0x00000010) or 0)+
57-
	else return 0 end
57+
		((int1%0x00000040>=0x00000020 ~= (int2%0x00000040>=0x00000020) and 0x00000020) or 0)+
58-
end
58+
		((int1%0x00000080>=0x00000040 ~= (int2%0x00000080>=0x00000040) and 0x00000040) or 0)+
59
		((int1%0x00000100>=0x00000080 ~= (int2%0x00000100>=0x00000080) and 0x00000080) or 0)+
60-
local function band(a, b, c, ...)
60+
		((int1%0x00000200>=0x00000100 ~= (int2%0x00000200>=0x00000100) and 0x00000100) or 0)+
61-
	local z
61+
		((int1%0x00000400>=0x00000200 ~= (int2%0x00000400>=0x00000200) and 0x00000200) or 0)+
62-
	if b then
62+
		((int1%0x00000800>=0x00000400 ~= (int2%0x00000800>=0x00000400) and 0x00000400) or 0)+
63-
		a = a % MOD
63+
		((int1%0x00001000>=0x00000800 ~= (int2%0x00001000>=0x00000800) and 0x00000800) or 0)+
64-
		b = b % MOD
64+
		((int1%0x00002000>=0x00001000 ~= (int2%0x00002000>=0x00001000) and 0x00001000) or 0)+
65-
		z = ((a + b) - bxor1(a,b)) / 2
65+
		((int1%0x00004000>=0x00002000 ~= (int2%0x00004000>=0x00002000) and 0x00002000) or 0)+
66-
		if c then z = bit32_band(z, c, ...) end
66+
		((int1%0x00008000>=0x00004000 ~= (int2%0x00008000>=0x00004000) and 0x00004000) or 0)+
67-
		return z
67+
		((int1%0x00010000>=0x00008000 ~= (int2%0x00010000>=0x00008000) and 0x00008000) or 0)+
68-
	elseif a then return a % MOD
68+
		((int1%0x00020000>=0x00010000 ~= (int2%0x00020000>=0x00010000) and 0x00010000) or 0)+
69-
	else return MODM end
69+
		((int1%0x00040000>=0x00020000 ~= (int2%0x00040000>=0x00020000) and 0x00020000) or 0)+
70-
end
70+
		((int1%0x00080000>=0x00040000 ~= (int2%0x00080000>=0x00040000) and 0x00040000) or 0)+
71
		((int1%0x00100000>=0x00080000 ~= (int2%0x00100000>=0x00080000) and 0x00080000) or 0)+
72-
local function bnot(x) return (-1 - x) % MOD end
72+
		((int1%0x00200000>=0x00100000 ~= (int2%0x00200000>=0x00100000) and 0x00100000) or 0)+
73
		((int1%0x00400000>=0x00200000 ~= (int2%0x00400000>=0x00200000) and 0x00200000) or 0)+
74-
local function rshift1(a, disp)
74+
		((int1%0x00800000>=0x00400000 ~= (int2%0x00800000>=0x00400000) and 0x00400000) or 0)+
75-
	if disp < 0 then return lshift(a,-disp) end
75+
		((int1%0x01000000>=0x00800000 ~= (int2%0x01000000>=0x00800000) and 0x00800000) or 0)+
76-
	return math.floor(a % 2 ^ 32 / 2 ^ disp)
76+
		((int1%0x02000000>=0x01000000 ~= (int2%0x02000000>=0x01000000) and 0x01000000) or 0)+
77-
end
77+
		((int1%0x04000000>=0x02000000 ~= (int2%0x04000000>=0x02000000) and 0x02000000) or 0)+
78
		((int1%0x08000000>=0x04000000 ~= (int2%0x08000000>=0x04000000) and 0x04000000) or 0)+
79-
local function rshift(x, disp)
79+
		((int1%0x10000000>=0x08000000 ~= (int2%0x10000000>=0x08000000) and 0x08000000) or 0)+
80-
	if disp > 31 or disp < -31 then return 0 end
80+
		((int1%0x20000000>=0x10000000 ~= (int2%0x20000000>=0x10000000) and 0x10000000) or 0)+
81-
	return rshift1(x % MOD, disp)
81+
		((int1%0x40000000>=0x20000000 ~= (int2%0x40000000>=0x20000000) and 0x20000000) or 0)+
82-
end
82+
		((int1%0x80000000>=0x40000000 ~= (int2%0x80000000>=0x40000000) and 0x40000000) or 0)+
83
		((int1>=0x80000000 ~= (int2>=0x80000000) and 0x80000000) or 0)
84-
local function lshift(a, disp)
84+
85-
	if disp < 0 then return rshift(a,-disp) end 
85+
		return (int3 and bxor(ret, int3, ...)) or ret
86-
	return (a * 2 ^ disp) % 2 ^ 32
86+
87-
end
87+
88
	local function bnot(int)
89-
local function rrotate(x, disp)
89+
		return 4294967295 - int
90-
    x = x % MOD
90+
91-
    disp = disp % 32
91+
92-
    local low = band(x, 2 ^ disp - 1)
92+
	local function rshift(int, by)
93-
    return rshift(x, disp) + lshift(low, 32 - disp)
93+
		local shifted = int / (2 ^ by)
94-
end
94+
		return shifted - shifted % 1
95
	end
96-
local k = {
96+
97-
	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
97+
	local function rrotate(int, by)
98-
	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
98+
		local shifted = int / (2 ^ by)
99-
	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
99+
		local fraction = shifted % 1
100-
	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
100+
		return (shifted - fraction) + fraction * (2 ^ 32)
101-
	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
101+
102-
	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
102+
103-
	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
103+
	local k = {
104-
	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
104+
		0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
105-
	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
105+
		0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
106-
	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
106+
		0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
107-
	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
107+
		0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
108-
	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
108+
		0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
109-
	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
109+
		0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
110-
	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
110+
		0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
111-
	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
111+
		0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
112-
	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
112+
		0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
113-
}
113+
		0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
114
		0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
115-
local function str2hexa(s)
115+
		0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
116-
	return (string.gsub(s, ".", function(c) return string.format("%02x", string.byte(c)) end))
116+
		0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
117-
end
117+
		0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
118
		0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
119-
local function num2s(l, n)
119+
		0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
120-
	local s = ""
120+
	}
121-
	for i = 1, n do
121+
122-
		local rem = l % 256
122+
	local function str2hexa(s)
123-
		s = string.char(rem) .. s
123+
		local h = string.gsub(s, ".", function(c)
124-
		l = (l - rem) / 256
124+
			return string.format("%02x", string.byte(c))
125
		end)
126-
	return s
126+
		return h
127-
end
127+
128
129-
local function s232num(s, i)
129+
	local function num2s(l, n)
130-
	local n = 0
130+
		local s = ""
131-
	for i = i, i + 3 do n = n*256 + string.byte(s, i) end
131+
		for i = 1, n do
132-
	return n
132+
			local rem = l % 256
133-
end
133+
			s = string.char(rem) .. s
134
			l = (l - rem) / 256
135-
local function preproc(msg, len)
135+
136-
	local extra = 64 - ((len + 9) % 64)
136+
		return s
137-
	len = num2s(8 * len, 8)
137+
138-
	msg = msg .. "\128" .. string.rep("\0", extra) .. len
138+
139-
	assert(#msg % 64 == 0)
139+
	local function s232num(s, i)
140-
	return msg
140+
		local n = 0
141-
end
141+
		for i = i, i + 3 do n = n*256 + string.byte(s, i) end
142
		return n
143-
local function initH256(H)
143+
144-
	H[1] = 0x6a09e667
144+
145-
	H[2] = 0xbb67ae85
145+
	local function preproc(msg, len)
146-
	H[3] = 0x3c6ef372
146+
		local extra = 64 - ((len + 1 + 8) % 64)
147-
	H[4] = 0xa54ff53a
147+
		len = num2s(8 * len, 8)
148-
	H[5] = 0x510e527f
148+
		msg = msg .. "\128" .. string.rep("\0", extra) .. len
149-
	H[6] = 0x9b05688c
149+
		return msg
150-
	H[7] = 0x1f83d9ab
150+
151-
	H[8] = 0x5be0cd19
151+
152-
	return H
152+
	local function initH256(H)
153-
end
153+
		H[1] = 0x6a09e667
154
		H[2] = 0xbb67ae85
155-
local function digestblock(msg, i, H)
155+
		H[3] = 0x3c6ef372
156-
	local w = {}
156+
		H[4] = 0xa54ff53a
157-
	for j = 1, 16 do w[j] = s232num(msg, i + (j - 1)*4) end
157+
		H[5] = 0x510e527f
158-
	for j = 17, 64 do
158+
		H[6] = 0x9b05688c
159-
		local v = w[j - 15]
159+
		H[7] = 0x1f83d9ab
160-
		local s0 = bxor(rrotate(v, 7), rrotate(v, 18), rshift(v, 3))
160+
		H[8] = 0x5be0cd19
161-
		v = w[j - 2]
161+
		return H
162-
		w[j] = w[j - 16] + s0 + w[j - 7] + bxor(rrotate(v, 17), rrotate(v, 19), rshift(v, 10))
162+
163
164
	local function digestblock(msg, i, H)
165-
	local a, b, c, d, e, f, g, h = H[1], H[2], H[3], H[4], H[5], H[6], H[7], H[8]
165+
		local w = {}
166-
	for i = 1, 64 do
166+
		for j = 1, 16 do w[j] = s232num(msg, i + (j - 1) * 4) end
167-
		local s0 = bxor(rrotate(a, 2), rrotate(a, 13), rrotate(a, 22))
167+
		for j = 17, 64 do
168-
		local maj = bxor(band(a, b), band(a, c), band(b, c))
168+
			local v = w[j - 15]
169-
		local t2 = s0 + maj
169+
			local s0 = bxor(rrotate(v, 7), rrotate(v, 18), rshift(v, 3))
170-
		local s1 = bxor(rrotate(e, 6), rrotate(e, 11), rrotate(e, 25))
170+
			v = w[j - 2]
171-
		local ch = bxor (band(e, f), band(bnot(e), g))
171+
			local s1 = bxor(rrotate(v, 17), rrotate(v, 19), rshift(v, 10))
172-
		local t1 = h + s1 + ch + k[i] + w[i]
172+
			w[j] = w[j - 16] + s0 + w[j - 7] + s1
173-
		h, g, f, e, d, c, b, a = g, f, e, d + t1, c, b, a, t1 + t2
173+
174
175
		local a, b, c, d, e, f, g, h = H[1], H[2], H[3], H[4], H[5], H[6], H[7], H[8]
176-
	H[1] = band(H[1] + a)
176+
		for i = 1, 64 do
177-
	H[2] = band(H[2] + b)
177+
			local s0 = bxor(rrotate(a, 2), rrotate(a, 13), rrotate(a, 22))
178-
	H[3] = band(H[3] + c)
178+
			local maj = bxor(band(a, b), band(a, c), band(b, c))
179-
	H[4] = band(H[4] + d)
179+
			local t2 = s0 + maj
180-
	H[5] = band(H[5] + e)
180+
			local s1 = bxor(rrotate(e, 6), rrotate(e, 11), rrotate(e, 25))
181-
	H[6] = band(H[6] + f)
181+
			local ch = bxor (band(e, f), band(bnot(e), g))
182-
	H[7] = band(H[7] + g)
182+
			local t1 = h + s1 + ch + k[i] + w[i]
183-
	H[8] = band(H[8] + h)
183+
			h, g, f, e, d, c, b, a = g, f, e, d + t1, c, b, a, t1 + t2
184-
end
184+
185
186
		H[1] = band(H[1], a)
187
		H[2] = band(H[2], b)
188
		H[3] = band(H[3], c)
189
		H[4] = band(H[4], d)
190
		H[5] = band(H[5], e)
191
		H[6] = band(H[6], f)
192
		H[7] = band(H[7], g)
193
		H[8] = band(H[8], h)
194
	end
195
196
	msg = preproc(msg, #msg)
197
	local H = initH256({})
198
	for i = 1, #msg, 64 do digestblock(msg, i, H) end
199
	return str2hexa(num2s(H[1], 4) .. num2s(H[2], 4) .. num2s(H[3], 4) .. num2s(H[4], 4) ..
200
		num2s(H[5], 4) .. num2s(H[6], 4) .. num2s(H[7], 4) .. num2s(H[8], 4))
201
end