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Aggiunto bytecode per criptare

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Giulio De Pasquale 2017-05-25 19:03:11 +02:00
parent b0a4e7bb2b
commit 696ab2ce27
1 changed files with 130 additions and 0 deletions
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asms/encrypt.pstc Normal file
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def datastrlen:
###############
# r0 = offset of str in data
# retval (r0) = strlen
###############
push r1
push r2
push r3
movr s2, r0
movi s1, 0
lodr s0, s2
cmpb s0, 0
jpei exit
loop:
movi s2, 0
addi s1, 1
addr s2, s1
lodr s0, s2
cmpb s0, 0
debg
jpni loop
exit:
movr r0, s1
poop r3
poop r2
poop r1
retn
def round: # round(uint16_t text[2])
#################
# r0 = offset of text[0] in data
# r1 = offset of text[1] in data
# r2 = text[0]
# r3 = text[1]
# retval = void
################
push r1
push r2
push r3
lodr r2, r0 # text[0]
lodr r3, r1 # text[1]
movi s0, 0 # i
movi s1, 0 # sum
loop:
push s0 # saving i
addi s1, 0x626f # sum += delta
push s1 # saving sum
# s0 and s1 will be used as tmps
#########
# calc v0
#########
movr s0, r3
shli s0, 4
addi s0, 0x7065 # s0 = (text[1] << 4) + k0
movr s1, r3
poop s3 # restoring sum in s3
addr s1, s3 # s1 = text[1] + sum
push s3 # saving sum again
xorr s0, s1 # s0 = ((text[1] << 4) + k0) ^ (text[1] + sum)
push s0
movr s0, r3
shri s0, 5
addi s0, 0x7065 # s0 = (text[1] >> 5) + k1
poop s1
xorr s0, s1 # s0 = ((text[1] << 4) + k0) ^ (text[1] + sum) ^ ((text[1] >> 5) + k1)
addr r2, s0 # r2 += s0
#########
# calc v1
#########
movr s0, r2
shli s0, 4
addi s0, 0x7275 # s0 = (text[0] << 4) + k2
movr s1, r2
poop s3 # restoring sum in s3
addr s1, s3 # s1 = text[0] + sum
push s3 # saving sum again
xorr s0, s1 # s0 = ((text[0] << 4) + k2) ^ (text[0] + sum)
push s0
movr s0, r2
shri s0, 5
addi s0, 0x6e73 # s0 = (text[0] >> 5) + k3
poop s1
xorr s0, s1 # s0 = ((text[0] << 4) + k2) ^ (text[0] + sum) ^ ((text[0] >> 5) + k3)
addr r3, s0 # r3 += s0
######
# end loop
#####
poop s1 # restoring sum
poop s0 # restoring i
addi s0, 1
cmpb s0, 127 # while (i < 128)
jpbi loop
# saving the values
strr r0, r2
strr r1, r3
poop r3
poop r2
poop r1
retn
def main:
movi r0, 0xadde
movi r1, 0x0bb0
stri 0, r0
stri 2, r1
movi r0, 0x0bb0
movi r1, 0xcefa
stri 0x4, r0
stri 0x6, r1
movi r0, 0
call datastrlen
movr r2, r0
movi s0, 0
encrypt:
push s0
movi r0, 0
movi r1, 2
addr r0, s0
addr r1, s0
call round
poop s0
addi s0, 1
cmpr s0, r2
jpbi encrypt
lodi r0, 0
lodi r1, 2
lodi r2, 4
lodi r3, 6
debg
shit