From 696ab2ce279f6d431ee170a1a980eeaa5306231b Mon Sep 17 00:00:00 2001 From: Giulio De Pasquale Date: Thu, 25 May 2017 19:03:11 +0200 Subject: [PATCH] Aggiunto bytecode per criptare --- asms/encrypt.pstc | 130 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 130 insertions(+) create mode 100644 asms/encrypt.pstc diff --git a/asms/encrypt.pstc b/asms/encrypt.pstc new file mode 100644 index 0000000..56dd94c --- /dev/null +++ b/asms/encrypt.pstc @@ -0,0 +1,130 @@ +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 \ No newline at end of file