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attackaes-core.jl
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attackaes-core.jl
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# This file is part of Jlsca, license is GPLv3, see https://www.gnu.org/licenses/gpl-3.0.en.html
#
# Author: Cees-Bart Breunesse
using Aes
using Trs
export AesSboxAttack,AesMCAttack,AesKeyLength,AesMode
@enum AesMode CIPHER=1 INVCIPHER=2 EQINVCIPHER=3
@enum AesKeyLength KL128=16 KL192=24 KL256=32
for s in instances(AesMode); @eval export $(Symbol(s)); end
for s in instances(AesKeyLength); @eval export $(Symbol(s)); end
abstract AesAttack <: Attack
# two types of attacks: sbox or mixcolumn
type AesSboxAttack <: AesAttack
mode::AesMode
keyLength::AesKeyLength
direction::Direction
dataOffset::Int
keyByteOffsets::Vector{Int}
knownKey::Nullable{Vector{UInt8}}
analysis::Analysis
xor::Bool
updateInterval::Nullable{Int}
phases::Vector{Phase}
phaseInput::Nullable{Vector{UInt8}}
outputkka::Nullable{AbstractString}
function AesSboxAttack()
leakageFunctions = [bit0, bit1, bit2, bit3, bit4, bit5, bit6, bit7]
return new(CIPHER, KL128, FORWARD, 1, collect(1:16), Nullable(), DPA(), false, Nullable(), [], Nullable(), Nullable())
end
end
function getPhases(params::AesSboxAttack)
if params.keyLength == KL128
return [PHASE1]
else
return [PHASE1, PHASE2]
end
end
type AesMCAttack <: AesAttack
mode::AesMode
keyLength::AesKeyLength
direction::Direction
dataOffset::Int
keyByteOffsets::Vector{Int}
knownKey::Nullable{Vector{UInt8}}
analysis::Analysis
xor::Bool
updateInterval::Nullable{Int}
phases::Vector{Phase}
phaseInput::Nullable{Vector{UInt8}}
outputkka::Nullable{AbstractString}
function AesMCAttack()
leakageFunctions = [bit0]
return new(CIPHER, KL128, FORWARD, 1, collect(1:16), Nullable(), DPA(), false, Nullable(), [], Nullable(), Nullable())
end
end
function getPhases(params::AesMCAttack)
return [PHASE1, PHASE2, PHASE3, PHASE4]
end
function toShortString(params::Union{AesSboxAttack,AesMCAttack})
typeStr = (isa(params,AesSboxAttack) ? "SBOX" : "MC")
modeStr = string(params.mode)
lengthStr = string(params.keyLength)
directionStr = string(params.direction)
analysisStr = (isa(params.analysis, DPA) ? "DPA" : "LRA")
return @sprintf("%s_%s_%s_%s_%s", typeStr, modeStr, lengthStr, analysisStr, directionStr)
end
# target functions
function invMcOut(x::UInt8, keyByte::UInt8, position::Int, constant::UInt8)
mcIn = fill(constant, 4)
mcIn[position] = invsbox[(x $ keyByte) + 1]
mcOut = Aes.InvMixColumn(mcIn)
ret::UInt32 = 0
for i in 1:4
ret <<= 8
ret |= mcOut[i]
end
return ret
end
function invMcOut(data::Array{UInt8}, dataColumn, keyByte::UInt8, position::Int, constant::UInt8)
ret = map(x -> invMcOut(x,keyByte,position,constant), data)
return ret
end
function mcOut(x::UInt8, keyByte::UInt8, position::Int, constant::UInt8)
mcIn = fill(constant, 4)
mcIn[position] = sbox[(x $ keyByte) + 1]
mcOut = Aes.MixColumn(mcIn)
ret::UInt32 = 0
for i in 1:4
ret <<= 8
ret |= mcOut[i]
end
return ret
end
function mcOut(data::Array{UInt8}, dataColumn, keyByte::UInt8, position::Int, constant::UInt8)
ret = map(x -> mcOut(x,keyByte,position,constant), data)
return ret
end
function mcOutXORIn(x::UInt8, keyByte::UInt8, position::Int, constant::UInt8)
mcIn = fill(constant, 4)
mcIn[position] = sbox[(x $ keyByte) + 1]
mcOut = Aes.MixColumn(mcIn) $ mcIn
ret::UInt32 = 0
for i in 1:4
ret <<= 8
ret |= mcOut[i]
end
return ret
end
function mcOutXORIn(data::Array{UInt8}, dataColumn, keyByte::UInt8, position::Int, constant::UInt8)
ret = map(x -> mcOutXORIn(x,keyByte,position,constant), data)
return ret
end
function sboxOut(data::Array{UInt8}, dataColumn, keyByte::UInt8)
ret = map(x -> sbox[(x $ keyByte) + 1], data)
return ret
end
function invSboxOut(data::Array{UInt8}, dataColumn, keyByte::UInt8)
ret = map(x -> invsbox[(x $ keyByte) + 1], data)
return ret
end
function sboxOutXORIn(data::Array{UInt8}, dataColumn, keyByte::UInt8)
ret = map(x -> x $ keyByte $ sbox[(x $ keyByte) + 1], data)
return ret
end
function invSboxOutXORIn(data::Array{UInt8}, dataColumn, keyByte::UInt8)
ret = map(x -> x $ keyByte $ invsbox[(x $ keyByte) + 1], data)
return ret
end
# some round functions
function invRound(output::Matrix, roundkey::Matrix)
state = Aes.AddRoundKey(output, roundkey)
state = Aes.InvShiftRows(state)
state = Aes.InvSubBytes(state)
state = Aes.InvMixColumns(state)
return state
end
function round(output::Matrix, roundkey::Matrix)
state = Aes.AddRoundKey(output, roundkey)
state = Aes.SubBytes(state)
state = Aes.ShiftRows(state)
state = Aes.MixColumns(state)
return state
end
# run the key schedule backwards to recover a key
function recoverKey(keymaterial::Vector{UInt8}, mode, direction)
if (mode == CIPHER && direction == FORWARD) || (mode == INVCIPHER && direction == BACKWARD) || (mode == EQINVCIPHER && direction == BACKWARD)
return keymaterial
else
Nk = div(length(keymaterial),Aes.wz)
Nr = Aes.keylength2Nr(length(keymaterial))
w = Aes.KeyExpansionBackwards(keymaterial, Nr, Nk)
return w[1:Nk*Aes.wz]
end
end
function getNumberOfCandidates(params::AesAttack)
return 256
end
function getTargetFunction(params::AesMCAttack)
if (params.direction == FORWARD && params.mode == CIPHER) || (params.direction == BACKWARD && params.mode != CIPHER)
if params.xor
targetfn = mcOutXORIn
else
targetfn = mcOut
end
else
if params.xor
targetfn = invMcOutXORIn
else
targetfn = invMcOut
end
end
return targetfn
end
function getTargetFunction(params::AesSboxAttack)
if (params.direction == FORWARD && params.mode == CIPHER) || (params.direction == BACKWARD && params.mode != CIPHER)
if params.xor
targetfn = sboxOutXORIn
else
targetfn = sboxOut
end
else
if params.xor
targetfn = invSboxOutXORIn
else
targetfn = invSboxOut
end
end
return targetfn
end
function printParameters(params::Union{AesSboxAttack,AesMCAttack})
targetFunction = getTargetFunction(params)
attackStr = (isa(params, AesSboxAttack) ? "Sbox" : "Mixcolumn")
analysisStr = string(typeof(params.analysis).name.name)
@printf("AES %s %s attack parameters\n", attackStr, analysisStr)
printParameters(params.analysis)
@printf("mode: %s\n", string(params.mode))
@printf("key length: %s\n", string(params.keyLength))
@printf("direction: %s\n", string(params.direction))
@printf("target: %s\n", string(targetFunction))
@printf("data at: %s\n", string(params.dataOffset))
@printf("key bytes: %s\n", string(params.keyByteOffsets))
if !isnull(params.knownKey)
@printf("known key: %s\n", bytes2hex(get(params.knownKey)))
end
end
# get the round key material the attack is recovering to add known key information in the scoring
function getCorrectRoundKeyMaterial(params::AesAttack, phase::Phase)
if isnull(params.knownKey)
return Nullable{Vector{UInt8}}()
end
mode = params.mode
direction = params.direction
knownKey = get(params.knownKey)
keyLength = params.keyLength
rklength = 16
off = 0
if isa(params, AesSboxAttack)
if phase == PHASE1
off = 0
else phase == PHASE2
off = 16
if keyLength == KL192
rklength = 8
end
end
end
if (mode == CIPHER && direction == FORWARD) || (mode == INVCIPHER && direction == BACKWARD) || (mode == EQINVCIPHER && direction == BACKWARD)
roundkey = knownKey[off+1:off+rklength]
else
Nk = div(length(knownKey),Aes.wz)
Nr = Aes.keylength2Nr(length(knownKey))
w = Aes.KeyExpansion(knownKey, Nr, Nk)
roundkey = w[end-off+1-rklength:end-off]
end
if isa(params, AesSboxAttack) && phase == PHASE2
if (mode == CIPHER && direction == BACKWARD) || (mode == INVCIPHER && direction == FORWARD) || (mode == EQINVCIPHER && direction == FORWARD)
for i in 1:div(rklength,4)
roundkey[(i-1)*4+1:i*4] = Aes.InvMixColumn(roundkey[(i-1)*4+1:i*4])
end
end
end
return Nullable{Vector{UInt8}}(roundkey)
end
# filter function for mixcolumns attack so that we don't accept data that's not semi-constant
function filterConstantInput(offsets, data::Vector{UInt8}, constant::UInt8)
for i in 1:length(data)
if !(i in offsets)
if data[i] != constant
# return nothing (and thus reject the trace)
return Vector{UInt8}(0)
end
end
end
return [data[x] for x in offsets]
end
# the mixcolumns attack
function scatask(trs::Trace, params::AesMCAttack, firstTrace=1, numberOfTraces=length(trs), phase::Phase=PHASE1, phaseInput=Nullable{Vector{UInt8}}())
params.keyLength == KL128 || throw(ErrorException("AesMCAttack only supported for 128 bits keys"))
params.direction == FORWARD || throw(ErrorException("AesMCAttack only supported in FORWARD direction"))
mode = params.mode
keyLength = params.keyLength
direction = params.direction
# dataOffsets = params.dataOffsets
knownKey = params.knownKey
targetFunction = getTargetFunction(params)
local scores
# select the bytes we need
addDataPass(trs, (x -> x[params.dataOffset + params.keyByteOffsets - 1]))
# should make this configurable maybe, but doesn't affect the attack (even if constant doesn't match the one in the traces)
constant = 0x0
if keyLength != KL128
throw(Exception("Only KL128 supported for MC attack"))
end
myfn = (data,keyBytePosition,keyVal) -> targetFunction(data, keyBytePosition, keyVal, 1, constant)
if isnull(phaseInput)
phaseInput = Nullable(zeros(UInt8, 16))
end
if phase == PHASE1
offset = 1
elseif phase == PHASE2
offset = 2
elseif phase == PHASE3
offset = 3
elseif phase == PHASE4
offset = 4
end
offsets = [o for o in offset:4:16]
# select only the traces we want
addDataPass(trs, x -> filterConstantInput(offsets, x, constant))
# do the attack
scores = analysis(params, phase, trs, firstTrace, numberOfTraces, myfn, UInt32, collect(UInt8, 0:255), offsets)
popDataPass(trs)
popDataPass(trs)
if scores == nothing
@printf("No results .. probably means your input traces are not chosen input\n");
return nothing
end
# get the recovered key material
roundkey::Vector{UInt8} = getRoundKey(scores)
# put them in their place
for o in 1:4
get(phaseInput)[offsets[o]] = roundkey[o]
end
if phase == PHASE4
produce(FINISHED, recoverKey(get(phaseInput), mode, direction))
else
produce(PHASERESULT, phaseInput)
end
end
function getRoundFunction(phase::Phase, params::AesSboxAttack, phaseInput::Nullable{Vector{UInt8}})
if phase == PHASE2 && params.keyLength != KL128
if params.keyLength == KL192
dataWidth = 8
else
dataWidth = 16
end
# setup the round function to calculate the output or input of the next target round
if (params.mode == CIPHER && params.direction == BACKWARD) || (params.mode == INVCIPHER && params.direction == FORWARD) || (params.mode == EQINVCIPHER && params.direction == FORWARD)
roundfn_ = x -> invRound(reshape(x, (4,4)), reshape(get(phaseInput), (4,4)))[end-dataWidth+1:end]
else
roundfn_ = x -> round(reshape(x, (4,4)), reshape(get(phaseInput), (4,4)))[1:dataWidth]
end
roundfn = Nullable(roundfn_)
else
roundfn = Nullable()
end
return roundfn
end
# the sbox attack
function scatask(trs::Trace, params::AesSboxAttack, firstTrace=1, numberOfTraces=length(trs), phase::Phase=PHASE1, phaseInput=Nullable{Vector{UInt8}}())
mode = params.mode
keyLength = params.keyLength
direction = params.direction
# dataOffsets = params.dataOffsets
knownKey = params.knownKey
updateInterval = params.updateInterval
targetFunction = getTargetFunction(params)
local key, scores
# FIXME: implement caching of cond avg traces
# if isfile("hack.bin")
# fd = open("hack.bin", "r")
# (data,samples) = deserialize(fd)
# close(fd)
# else
# @time (data,samples) = readTraces(trs, firstTrace, numberOfTraces)
# if typeof(samples) == Vector{Matrix}
# fd = open("hack.bin", "w")
# serialize(fd, (data,samples))
# # samples = map(s-> s[:,361:361+552], samples)
# close(fd)
# end
# end
addDataPass(trs, (x -> x[params.dataOffset + collect(1:16) - 1]))
roundfn = getRoundFunction(phase, params, phaseInput)
if !isnull(roundfn)
addDataPass(trs, get(roundfn))
end
notAllKeyBytes::Bool = (phase == PHASE1 && length(params.keyByteOffsets) < 16) || (phase == PHASE2 && keyLength == KL256 && length(params.keyByteOffsets) < 16) || (phase == PHASE2 && keyLength == KL192 && length(params.keyByteOffsets) < 8)
# if the client doesn't want all the key bytes, we won't give him all the key bytes ;)
if notAllKeyBytes
addDataPass(trs, (x -> x[params.keyByteOffsets]))
end
# do the attack
scores = analysis(params, phase, trs, firstTrace, numberOfTraces, targetFunction, UInt8, collect(UInt8, 0:255), params.keyByteOffsets)
# if we added a round function on the input data, now we need to remove it
if !isnull(roundfn)
popDataPass(trs)
end
# if the client didn't want all the key bytes, we need to pop another pass
if notAllKeyBytes
popDataPass(trs)
end
# pop the pass we used to select the bytes we need
popDataPass(trs)
if notAllKeyBytes
# not enough key bytes to continue
produce(FINISHED, nothing)
return
end
# get the recovered key material
roundkey::Vector{UInt8} = getRoundKey(scores)
if phase == PHASE1 && keyLength == KL128
# we're done now
key = recoverKey(roundkey, mode, direction)
produce(FINISHED, key)
elseif phase == PHASE1
# we need another round
# FIXME: get rid of this hack
if keyLength == KL192
params.keyByteOffsets = collect(1:8)
else
params.keyByteOffsets = collect(1:16)
end
prevroundkey = Nullable(roundkey)
produce(PHASERESULT, prevroundkey)
elseif phase == PHASE2
# done, just some key fiddling left
# for these mode & direction combinations we actually recovered a InvMixColumn key, so correct it
if (mode == CIPHER && direction == BACKWARD) || (mode == INVCIPHER && direction == FORWARD) || (mode == EQINVCIPHER && direction == FORWARD)
for i in 1:div(length(params.keyByteOffsets),4)
roundkey[(i-1)*4+1:i*4] = Aes.MixColumn(roundkey[(i-1)*4+1:i*4])
end
end
# put the recovered key material in the correct order and run the key schedules
if (direction == BACKWARD && mode == CIPHER) || (direction == FORWARD && mode != CIPHER)
keymaterial = vcat(roundkey, get(phaseInput))
else
keymaterial = vcat(get(phaseInput), roundkey)
end
key = recoverKey(keymaterial, mode, direction)
produce(FINISHED, key)
end
end