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418 lines (392 loc) · 10.9 KB
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defmodule ExSha3 do
@compile {:inline, exor: 5, band: 2, rol: 2, absorb: 6, squeeze: 4}
use Bitwise, only_operators: true
@moduledoc """
ExSha3 supports the three hash algorithms:
* KECCAK1600-f the original pre-fips version as used in Ethereum
* SHA3 the fips-202 approved final hash
* SHAKE
Keccak and SHA3 produce fixed length strings corresponding to their
bit length, while shake produces an arbitary length output according
to the provided outlen parameter.
"""
for bit <- [224, 256, 384, 512] do
Module.eval_quoted(
__MODULE__,
Code.string_to_quoted("""
@spec keccak_#{bit}(binary()) :: binary()
def keccak_#{bit}(source), do: keccak(#{bit}, source)
@spec sha3_#{bit}(binary()) :: binary()
def sha3_#{bit}(source), do: sha3(#{bit}, source)
""")
)
end
for bit <- [128, 256] do
Module.eval_quoted(
__MODULE__,
Code.string_to_quoted("""
@spec shake_#{bit}(binary(), number()) :: binary()
def shake_#{bit}(source, outlen), do: shake(#{bit}, outlen, source)
""")
)
end
@a <<0::200*8>>
for {bits, outlen, rate} <- [{224, 28, 144}, {256, 32, 136}, {384, 48, 104}, {512, 64, 72}] do
defp sha3(unquote(bits), src) do
len = byte_size(src)
@a
|> absorb(src, len, len, unquote(rate), <<0x06>>)
|> binary_part(0, unquote(outlen))
end
defp keccak(unquote(bits), src) do
len = byte_size(src)
@a
|> absorb(src, len, len, unquote(rate), <<0x01>>)
|> binary_part(0, unquote(outlen))
end
end
for {bits, rate} <- [{128, 168}, {256, 136}] do
defp shake(unquote(bits), outlen, src) do
len = byte_size(src)
squeeze(
<<0::outlen*8>>,
absorb(@a, src, len, len, unquote(rate), <<0x1F>>),
outlen,
unquote(rate)
)
end
end
defp keccakf(
<<b0::binary-size(8), b1::binary-size(8), b2::binary-size(8), b3::binary-size(8),
b4::binary-size(8), b5::binary-size(8), b6::binary-size(8), b7::binary-size(8),
b8::binary-size(8), b9::binary-size(8), b10::binary-size(8), b11::binary-size(8),
b12::binary-size(8), b13::binary-size(8), b14::binary-size(8), b15::binary-size(8),
b16::binary-size(8), b17::binary-size(8), b18::binary-size(8), b19::binary-size(8),
b20::binary-size(8), b21::binary-size(8), b22::binary-size(8), b23::binary-size(8),
b24::binary-size(8)>>
) do
keccakf(
b0,
b1,
b2,
b3,
b4,
b5,
b6,
b7,
b8,
b9,
b10,
b11,
b12,
b13,
b14,
b15,
b16,
b17,
b18,
b19,
b20,
b21,
b22,
b23,
b24,
0
)
end
defp keccakf(
b0,
b1,
b2,
b3,
b4,
b5,
b6,
b7,
b8,
b9,
b10,
b11,
b12,
b13,
b14,
b15,
b16,
b17,
b18,
b19,
b20,
b21,
b22,
b23,
b24,
24
) do
<<b0::binary(), b1::binary(), b2::binary(), b3::binary(), b4::binary(), b5::binary(),
b6::binary(), b7::binary(), b8::binary(), b9::binary(), b10::binary(), b11::binary(),
b12::binary(), b13::binary(), b14::binary(), b15::binary(), b16::binary(), b17::binary(),
b18::binary(), b19::binary(), b20::binary(), b21::binary(), b22::binary(), b23::binary(),
b24::binary()>>
end
@full64 <<0xFFFFFFFFFFFFFFFF::little-unsigned-size(64)>>
for {step, rc} <- [
{0, 1},
{1, 0x8082},
{2, 0x800000000000808A},
{3, 0x8000000080008000},
{4, 0x808B},
{5, 0x80000001},
{6, 0x8000000080008081},
{7, 0x8000000000008009},
{8, 0x8A},
{9, 0x88},
{10, 0x80008009},
{11, 0x8000000A},
{12, 0x8000808B},
{13, 0x800000000000008B},
{14, 0x8000000000008089},
{15, 0x8000000000008003},
{16, 0x8000000000008002},
{17, 0x8000000000000080},
{18, 0x800A},
{19, 0x800000008000000A},
{20, 0x8000000080008081},
{21, 0x8000000000008080},
{22, 0x80000001},
{23, 0x8000000080008008}
] do
defp keccakf(
b0,
b1,
b2,
b3,
b4,
b5,
b6,
b7,
b8,
b9,
b10,
b11,
b12,
b13,
b14,
b15,
b16,
b17,
b18,
b19,
b20,
b21,
b22,
b23,
b24,
unquote(step)
) do
zero = exor(b0, b5, b10, b15, b20)
b6, b11, b16, b21)
two = exor(b2, b7, b12, b17, b22)
three = exor(b3, b8, b13, b18, b23)
four = exor(b4, b9, b14, b19, b24)
tmp0 = exor(four, rol(one, 1))
tmp1 = exor(zero, rol(two, 1))
tmp2 = exor(one, rol(three, 1))
tmp3 = exor(two, rol(four, 1))
tmp4 = exor(three, rol(zero, 1))
keccakf_exor(
unquote(step),
exor(b0, tmp0),
# b6 -> b1
rol(exor(b6, tmp1), 44),
# b12 -> b2
rol(exor(b12, tmp2), 43),
# b18 -> b3
rol(exor(b18, tmp3), 21),
# b24 -> b4
rol(exor(b24, tmp4), 14),
# b3 -> b5
rol(exor(b3, tmp3), 28),
# b9 -> b6
rol(exor(b9, tmp4), 20),
# b10 -> b7
rol(exor(b10, tmp0), 3),
# b16 -> b8
rol(exor(b16, tmp1), 45),
# b22 -> b9
rol(exor(b22, tmp2), 61),
# b1 -> b10
rol(exor(b1, tmp1), 1),
# b7 -> b11
rol(exor(b7, tmp2), 6),
# b13 -> b12
rol(exor(b13, tmp3), 25),
# b19 -> b13
rol(exor(b19, tmp4), 8),
# b20 -> b14
rol(exor(b20, tmp0), 18),
# b4 -> b15
rol(exor(b4, tmp4), 27),
# b5 -> b16
rol(exor(b5, tmp0), 36),
# b11 -> b17
rol(exor(b11, tmp1), 10),
# b17 -> b18
rol(exor(b17, tmp2), 15),
# b23 -> b19
rol(exor(b23, tmp3), 56),
# b2 -> b20
rol(exor(b2, tmp2), 62),
# b8 -> b21
rol(exor(b8, tmp3), 55),
# b14 -> b22
rol(exor(b14, tmp4), 39),
# b15 -> b23
rol(exor(b15, tmp0), 41),
# b21 -> b24
rol(exor(b21, tmp1), 2)
)
end
defp keccakf_exor(
unquote(step),
b0,
b1,
b2,
b3,
b4,
b5,
b6,
b7,
b8,
b9,
b10,
b11,
b12,
b13,
b14,
b15,
b16,
b17,
b18,
b19,
b20,
b21,
b22,
b23,
b24
) do
# b0 -> b0 ^^^ b1 &&& b2 #0 ^^^ rc
keccakf(
exor(
exor(b0, band(exor(b1, @full64), b2)),
<<unquote(rc)::little-unsigned-size(64)>>
),
# b6 -> b1 ^^^ b2 &&& b3 #1
exor(b1, band(exor(b2, @full64), b3)),
# b12 -> b2 ^^^ b3 &&& b4 #2
exor(b2, band(exor(b3, @full64), b4)),
# b18 -> b3 ^^^ b4 &&& b0 #3
exor(b3, band(exor(b4, @full64), b0)),
# b24 -> b4 ^^^ b0 &&& b1 #4
exor(b4, band(exor(b0, @full64), b1)),
# b3 -> b5 ^^^ b6 &&& b7 #0
exor(b5, band(exor(b6, @full64), b7)),
# b9 -> b6 ^^^ b7 &&& b8 #1
exor(b6, band(exor(b7, @full64), b8)),
# b10 -> b7 ^^^ b8 &&& b9 #2
exor(b7, band(exor(b8, @full64), b9)),
# b16 -> b8 ^^^ b9 &&& b6 #3
exor(b8, band(exor(b9, @full64), b5)),
# b22 -> b9 ^^^ b6 &&& b5 #4
exor(b9, band(exor(b5, @full64), b6)),
# b1 -> b10 ^^^ b11 &&& b12 #0
exor(b10, band(exor(b11, @full64), b12)),
# b7 -> b11 ^^^ b12 &&& b14 #1
exor(b11, band(exor(b12, @full64), b13)),
# b13 -> b12 ^^^ b14 &&& b15 #2
exor(b12, band(exor(b13, @full64), b14)),
# b19 -> b13 ^^^ b15 &&& b10 #3
exor(b13, band(exor(b14, @full64), b10)),
# b20 -> b14 ^^^ b10 &&& b11 #4
exor(b14, band(exor(b10, @full64), b11)),
# b4 -> b15 ^^^ b16 &&& b17 #0
exor(b15, band(exor(b16, @full64), b17)),
# b5 -> b16 ^^^ b17 &&& b18 #1
exor(b16, band(exor(b17, @full64), b18)),
# b11 -> b17 ^^^ b18 &&& b19 #2
exor(b17, band(exor(b18, @full64), b19)),
# b17 -> b18 ^^^ b19 &&& b15 #3
exor(b18, band(exor(b19, @full64), b15)),
# b23 -> b19 ^^^ b15 &&& b16 #4
exor(b19, band(exor(b15, @full64), b16)),
# b2 -> b20 ^^^ b21 &&& b22 #0
exor(b20, band(exor(b21, @full64), b22)),
# b8 -> b21 ^^^ b22 &&& b23 #1
exor(b21, band(exor(b22, @full64), b23)),
# b14 -> b22 ^^^ b23 &&& b24 #2
exor(b22, band(exor(b23, @full64), b24)),
# b15 -> b23 ^^^ b24 &&& b20 #3
exor(b23, band(exor(b24, @full64), b20)),
# b21 -> b24 ^^^ b20 &&& b21 #4
exor(b24, band(exor(b20, @full64), b21)),
unquote(step) + 1
)
end
end
defp rol(<<x::little-unsigned-size(64)>>, s) do
x = x <<< s
y = x >>> 64
x = (x &&& 0xFFFFFFFFFFFFFFFF) + y
<<x::little-unsigned-size(64)>>
end
@zero <<0::little-unsigned-size(64)>>
defp exor(one, two, three, four, five) do
@zero
|> exor(one)
|> exor(two)
|> exor(three)
|> exor(four)
|> exor(five)
end
defp exor(one, two) do
:crypto.exor(one, two)
end
defp band(<<a::little-unsigned-size(64)>>, <<b::little-unsigned-size(64)>>) do
<<a &&& b::little-unsigned-size(64)>>
end
defp xorin(dst, src, offset, len) do
<<start::binary-size(len), rest::binary()>> = dst
<<_start::binary-size(offset), block::binary-size(len), _rest::binary()>> = src
<<exor(block, start)::binary(), rest::binary()>>
end
defp xor(a, len, value) do
<<start::binary-size(len), block::binary-size(1), rest::binary()>> = a
<<start::binary(), exor(block, value)::binary(), rest::binary()>>
end
# Fallbacks
defp absorb(a, src, src_len, len, rate, delim) when len >= rate do
a
|> xorin(src, src_len - len, rate)
|> keccakf()
|> absorb(src, src_len, len - rate, rate, delim)
end
defp absorb(a, src, src_len, len, rate, delim) do
a
# Xor source the DS and pad frame.
|> xor(len, delim)
#
|> xor(rate - 1, <<0x80>>)
|> xorin(src, src_len - len, len)
# Apply P
|> keccakf()
end
defp squeeze(out, a, len, rate) do
case out do
<<_offset::binary-size(len), rest::binary()>> when len >= rate ->
<<binary_part(a, 0, len)::binary(), rest::binary>>
|> keccakf()
|> squeeze(a, len - rate, rate)
<<_offset::binary-size(len), rest::binary()>> ->
<<binary_part(a, 0, len)::binary(), rest::binary()>>
end
end
end