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sha-core.jl
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sha-core.jl
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Ch(x::UInt32,y::UInt32,z::UInt32) = (x & y) $ (~x & z)
Maj(x::UInt32,y::UInt32,z::UInt32) = (x & y) $ (x & z) $ (y & z)
rotl(value::UInt32, count::Int) = (value<<count) | (value>>( (-count) & 0b11111 ))
rotr(value::UInt32, count::Int) = (value>>count) | (value<<( (-count) & 0b11111 ))
Parity(x::UInt32,y::UInt32,z::UInt32) = x $ y $ z
function f(t)
if 0 <= t <= 19
return Ch
elseif 20 <= t <= 39 || 60 <= t <= 79
return Parity
elseif 40 <= t <= 59
return Maj
else
throw(ErrorException("AAh"))
end
end
function K(t)
if 0 <= t <= 19
return UInt32(0x5a827999)
elseif 20 <= t <= 39
return UInt32(0x6ed9eba1)
elseif 40 <= t <= 59
return UInt32(0x8f1bbcdc)
elseif 60 <= t <= 79
return UInt32(0xca62c1d6)
else
throw(Error("AAh"))
end
end
padlen(msgLen::Int) = (Int(448) - (msgLen*8 + 1)) & ((2^9)-1)
const H00 = UInt32(0x67452301)
const H01 = UInt32(0xefcdab89)
const H02 = UInt32(0x98badcfe)
const H03 = UInt32(0x10325476)
const H04 = UInt32(0xc3d2e1f0)
const sha1blocksizebytes = 64
type Sha1state
H0::UInt32
H1::UInt32
H2::UInt32
H3::UInt32
H4::UInt32
block::Vector{UInt8}
free::Int
msgLen::Int
Sha1state() = new(H00, H01, H02, H03, H04, zeros(UInt8, sha1blocksizebytes), sha1blocksizebytes, 0)
end
function calcW(Mi)
W = zeros(UInt32, 80)
for t in 1:16
W[t] = Mi[t]
end
for t in 17:80
W[t] = rotl(W[t-3] $ W[t-8] $ W[t-14] $ W[t-16], 1)
end
return W
end
function loop(W, a, b, c, d ,e)
for t in 0:79
T = rotl(a,5) + f(t)(b,c,d) + e + K(t) + W[t+1]
e = d
d = c
c = rotl(b, 30)
b = a
a = T
end
return (a,b,c,d,e)
end
function round(state::Sha1state)
# block is to be interpreted big endian
W = calcW(map(ntoh, reinterpret(UInt32,state.block)))
a = state.H0
b = state.H1
c = state.H2
d = state.H3
e = state.H4
(a,b,c,d,e) = loop(W, a,b,c,d,e)
state.H0 = a + state.H0
state.H1 = b + state.H1
state.H2 = c + state.H2
state.H3 = d + state.H3
state.H4 = e + state.H4
end
function update(state::Sha1state, msg::Vector{UInt8})
# update the msg length
state.msgLen += length(msg)
msgOffset = 1
while msgOffset <= length(msg)
# fill up the block buffer
bl = min(state.free, length(msg) - msgOffset + 1)
blockOffset = length(state.block) - state.free + 1
# @printf("bl %d, blockOffset %d, msgOffset %d\n", bl, blockOffset, msgOffset)
state.block[blockOffset:(blockOffset + bl - 1)] = msg[msgOffset:(msgOffset + bl - 1)]
msgOffset += bl
state.free -= bl
# flush if it's full
if state.free == 0
round(state)
state.free = sha1blocksizebytes
end
end
end
function final(state::Sha1state)
padlenBits = padlen(state.msgLen)
paddedMsgLen = (padlenBits + 1 + 64) >> 3
paddedMsg = zeros(UInt8, paddedMsgLen)
paddedMsg[1] = 0x80
len64 = UInt64(state.msgLen*8)
# @printf("len64 %d\n", len64)
for i in 0:7
paddedMsg[end-i] = ((len64 >> (i*8)) & 0xff)
end
update(state, paddedMsg)
# there should be no residual data in state.block
if state.free != sha1blocksizebytes
throw(ErrorException("bad hat harry"))
end
# output is to be interpreted big endian
return reinterpret(UInt8, map(hton, [state.H0,state.H1,state.H2,state.H3,state.H4]))
end
function sha1init()
return Sha1state()
end
function sha1(msg::Vector{UInt8})
state = sha1init()
update(state, msg)
return final(state)
end
function K0(key::Vector{UInt8})
if length(key) == sha1blocksizebytes
return key
elseif length(key) > sha1blocksizebytes
hashed = sha1(key)
return [hashed; [0x00 for i in 1:(sha1blocksizebytes - length(hashed))]]
else
return [key; [0x00 for i in 1:(sha1blocksizebytes - length(key))]]
end
end
function hmacsha1(key::Vector{UInt8}, msg::Vector{UInt8})
innerstate = sha1init()
innerkey = K0(key) $ 0x36
update(innerstate, innerkey)
update(innerstate, msg)
outerstate = sha1init()
outerkey = K0(key) $ 0x5c
update(outerstate, [outerkey; final(innerstate)])
return final(outerstate)
end