Compare commits
7 Commits
61ba182b13
...
a0128d323b
Author | SHA1 | Date | |
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a0128d323b | ||
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cc6cd1ee6e | ||
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701881b0b2 | ||
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645ffec880 | ||
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57022e534c | ||
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d6964e25c4 | ||
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1202a2156f |
1
.gitignore
vendored
1
.gitignore
vendored
@ -1,4 +1,5 @@
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*.gipu
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*.gipu
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*.out
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*.out
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*.elf
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*.elf
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*.pasticciotto
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.vscode/
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.vscode/
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@ -1,7 +1,6 @@
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import sys
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import sys
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import re
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import re
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import struct
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import struct
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import IPython
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import copy
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import copy
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import argparse
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import argparse
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@ -1,5 +1,5 @@
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#include "debug.h"
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#include "../vm/debug.h"
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#include "vm.h"
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#include "../vm/vm.h"
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#include <fstream>
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#include <fstream>
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#include <stdint.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdio.h>
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111
polictf/asms/decrypt.pstc
Normal file
111
polictf/asms/decrypt.pstc
Normal file
@ -0,0 +1,111 @@
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def datastrlen:
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###############
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# r0 = offset of str in data
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# retval (r0) = strlen
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###############
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push r1
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push r2
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push r3
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movr s2, r0
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movi s1, 0
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lodr s0, s2
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cmpb s0, 0
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jpei exit
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loop:
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movi s2, 0
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addi s1, 1
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addr s2, s1
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lodr s0, s2
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cmpb s0, 0
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jpni loop
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exit:
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movr r0, s1
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poop r3
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poop r2
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poop r1
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retn
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def round: # round(uint16_t text[2])
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#################
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# r0 = offset of text[0] in data
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# r1 = offset of text[1] in data
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# r2 = text[0]
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# r3 = text[1]
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# retval = void
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################
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push r1
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push r2
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push r3
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lodr r2, r0 # text[0]
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lodr r3, r1 # text[1]
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movi s0, 0 # i
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movi s1, 0 # sum
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loop:
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push s0 # saving i
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# s0 and s1 will be used as tmps
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#########
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# calc v1
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#########
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movr s0, r2
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shli s0, 4
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addi s0, 0x7275 # s0 = (text[0] << 4) + k2
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movr s1, r2
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xorr s0, s1 # s0 = ((text[0] << 4) + k2) ^ text[0]
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push s0
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movr s0, r2
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shri s0, 5
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addi s0, 0x6e73 # s0 = (text[0] >> 5) + k3
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poop s1
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xorr s0, s1 # s0 = ((text[0] << 4) + k2) ^ text[0] ^ ((text[0] >> 5) + k3)
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subr r3, s0 # r3 -= s0
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#########
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# calc v0
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#########
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movr s0, r3
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shli s0, 4
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addi s0, 0x7065 # s0 = (text[1] << 4) + k0
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movr s1, r3
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xorr s0, s1 # s0 = ((text[1] << 4) + k0) ^ text[1]
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push s0
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movr s0, r3
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shri s0, 5
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addi s0, 0x7065 # s0 = (text[1] >> 5) + k1
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poop s1
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xorr s0, s1 # s0 = ((text[1] << 4) + k0) ^ text[1] ^ ((text[1] >> 5) + k1)
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subr r2, s0 # r2 -= s0
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######
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# end loop
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#####
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poop s0 # restoring i
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addi s0, 1
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cmpb s0, 127 # while (i < 128)
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jpbi loop
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# saving the values
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strr r0, r2
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strr r1, r3
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poop r3
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poop r2
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poop r1
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retn
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def main:
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movi r0, 0
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call datastrlen
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movr r2, r0
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movi s0, 0
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decrypt:
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push s0
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movi r0, 0
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movi r1, 2
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addr r0, s0
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addr r1, s0
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call round
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poop s0
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addi s0, 4
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cmpr s0, r2
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jpbi decrypt
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lodi r0, 0
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lodi r1, 2
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lodi r2, 4
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lodi r3, 6
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shit
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@ -53,7 +53,7 @@ shli s0, 4
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addi s0, 0x7065 # s0 = (text[1] << 4) + k0
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addi s0, 0x7065 # s0 = (text[1] << 4) + k0
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movr s1, r3
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movr s1, r3
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poop s3 # restoring sum in s3
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poop s3 # restoring sum in s3
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addr s1, s3 # s1 = text[1] + sum
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#addr s1, s3 # s1 = text[1] + sum
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push s3 # saving sum again
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push s3 # saving sum again
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xorr s0, s1 # s0 = ((text[1] << 4) + k0) ^ (text[1] + sum)
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xorr s0, s1 # s0 = ((text[1] << 4) + k0) ^ (text[1] + sum)
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push s0
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push s0
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@ -71,7 +71,7 @@ shli s0, 4
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addi s0, 0x7275 # s0 = (text[0] << 4) + k2
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addi s0, 0x7275 # s0 = (text[0] << 4) + k2
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movr s1, r2
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movr s1, r2
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poop s3 # restoring sum in s3
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poop s3 # restoring sum in s3
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addr s1, s3 # s1 = text[0] + sum
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#addr s1, s3 # s1 = text[0] + sum
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push s3 # saving sum again
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push s3 # saving sum again
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xorr s0, s1 # s0 = ((text[0] << 4) + k2) ^ (text[0] + sum)
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xorr s0, s1 # s0 = ((text[0] << 4) + k2) ^ (text[0] + sum)
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push s0
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push s0
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@ -118,7 +118,7 @@ addr r0, s0
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addr r1, s0
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addr r1, s0
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call round
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call round
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poop s0
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poop s0
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addi s0, 1
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addi s0, 4
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cmpr s0, r2
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cmpr s0, r2
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jpbi encrypt
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jpbi encrypt
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lodi r0, 0
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lodi r0, 0
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@ -1,4 +1,4 @@
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#include "../vm/vm.h"
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#include "../../vm/vm.h"
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#include <fstream>
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#include <fstream>
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#include <stdint.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdio.h>
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Binary file not shown.
@ -1 +1 @@
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TheDataSectionHasBeenEncrypted
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TheDataSectionHasBeenEncrypted!WhoAreYouGonnaCall?TheRuNasss!
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1
polictf/res/encrypteddatasection
Normal file
1
polictf/res/encrypteddatasection
Normal file
@ -0,0 +1 @@
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Œê¾ªí Ðk™R%¹æØÿùé’zÅÄ~*ìg2E$ÐLdYí¦xþѼàØ:ùûùùn\RXF<58>UXE!
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@ -1,5 +1,5 @@
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#include "../vm/vm.h"
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#include "../../vm/vm.h"
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#include "../vm/debug.h"
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#include "../../vm/debug.h"
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#include <fstream>
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#include <fstream>
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#include <iostream>
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#include <iostream>
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#include <stdint.h>
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#include <stdint.h>
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@ -25,13 +25,18 @@ void gen_random(uint8_t *s, const int len) {
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}
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}
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unsigned char encrypted_data[] = {
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unsigned char encrypted_data[] = {
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0xcc, 0x8d, 0x5a, 0xcc, 0x73, 0xb5, 0xf2, 0xa3, 0xf3, 0x92,
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0x8c, 0xea, 0xbe, 0xaa, 0xed, 0xa0, 0xd0, 0x6b, 0x99, 0x1c, 0x52, 0x25,
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0xa8, 0x8f, 0x2f, 0xf1, 0x3e, 0xf4, 0x69, 0x00, 0x4a, 0xcb,
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0xb9, 0xe6, 0xd8, 0xff, 0xf9, 0xe9, 0x92, 0x7a, 0x1c, 0xc5, 0xc4, 0x7e,
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0xed, 0xc4, 0x57, 0x9b, 0xf6, 0x9a, 0x78, 0x46, 0x83, 0xe9};
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0x2a, 0xec, 0x67, 0x32, 0x1f, 0x45, 0x24, 0xd0, 0x4c, 0x7f, 0x15, 0x64,
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unsigned int encrypted_data_len = 30;
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0x59, 0xed, 0xa6, 0x78, 0xfe, 0xad, 0xd1, 0xbc, 0xe0, 0xd8, 0x3a, 0xf9,
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0xfb, 0xf9, 0xf9, 0x6e, 0x5c, 0x52, 0x58, 0x46, 0x8d, 0x55, 0x58, 0x45,
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0x21
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};
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unsigned int encrypted_data_len = 61;
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int main(int argc, char *argv[]) {
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int main(int argc, char *argv[]) {
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uint8_t *key = new uint8_t[KEYLEN], *decdatasec = new uint8_t[DATAKEYLEN],
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uint8_t *key = new uint8_t[KEYLEN], *decdatasec = new uint8_t[encrypted_data_len],
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*flag = new uint8_t[DATAKEYLEN];
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*flag = new uint8_t[DATAKEYLEN];
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uint8_t *clientcode;
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uint8_t *clientcode;
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uint8_t i;
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uint8_t i;
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@ -40,42 +45,58 @@ int main(int argc, char *argv[]) {
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gen_random(key, KEYLEN);
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gen_random(key, KEYLEN);
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printf("Use this: \"%s\"\n", key);
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printf("Use this: \"%s\"\n", key);
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fflush(stdout);
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printf("How much data are you sending me?\n");
|
printf("How much data are you sending me?\n");
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fflush(stdout);
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scanf("%d", &clientcodesize);
|
scanf("%d", &clientcodesize);
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printf("Go ahead then!\n");
|
printf("Go ahead then!\n");
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|
fflush(stdout);
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clientcode = new uint8_t[clientcodesize];
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clientcode = new uint8_t[clientcodesize];
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bytesread = read(0, clientcode, clientcodesize);
|
bytesread = read(0, clientcode, clientcodesize);
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if (bytesread != clientcodesize) {
|
if (bytesread != clientcodesize) {
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printf("ERROR! Couldn't read everything!\n");
|
printf("ERROR! Couldn't read everything!\n");
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|
fflush(stdout);
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exit(1);
|
exit(1);
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}
|
}
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VM vm(key, clientcode, clientcodesize);
|
VM vm(key, clientcode, clientcodesize);
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vm.as.insData(encrypted_data, encrypted_data_len);
|
vm.as.insData(encrypted_data, encrypted_data_len);
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printf("BEFORE:\n");
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for (i = 0; i < DATAKEYLEN; i++) {
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fprintf(stdout, "buf[%d] = 0x%02x\n", i, vm.as.data[i]);
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|
}
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vm.run();
|
vm.run();
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||||||
|
|
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datap = fopen("./res/decrypteddatasection.txt", "r");
|
datap = fopen("../res/decrypteddatasection.txt", "r");
|
||||||
if (datap == NULL) {
|
if (datap == NULL) {
|
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printf("Couldn't open decrypteddatasection.txt!\n");
|
printf("Couldn't open decrypteddatasection.txt!\n");
|
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|
fflush(stdout);
|
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exit(1);
|
exit(1);
|
||||||
}
|
}
|
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fscanf(datap, "%s", decdatasec);
|
fscanf(datap, "%s", decdatasec);
|
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fclose(datap);
|
fclose(datap);
|
||||||
|
|
||||||
|
for (i = 0; i < DATAKEYLEN; i++) {
|
||||||
|
fprintf(stdout, "buf[%d] = 0x%02x\n", i, vm.as.data[i]);
|
||||||
|
}
|
||||||
for (i = 0; i < DATAKEYLEN; i++) {
|
for (i = 0; i < DATAKEYLEN; i++) {
|
||||||
if (vm.as.data[i] != decdatasec[i]) {
|
if (vm.as.data[i] != decdatasec[i]) {
|
||||||
DBG_INFO(("Checking data[%d]..\n", i));
|
printf("Checking data[%d]..\n", i);
|
||||||
|
fflush(stdout);
|
||||||
printf("Nope!\n");
|
printf("Nope!\n");
|
||||||
|
fflush(stdout);
|
||||||
exit(1);
|
exit(1);
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
flagp = fopen("./res/flag.txt", "r");
|
flagp = fopen("../res/flag.txt", "r");
|
||||||
if (flagp == NULL) {
|
if (flagp == NULL) {
|
||||||
printf("Couldn't open flag.txt!\n");
|
printf("Couldn't open flag.txt!\n");
|
||||||
|
fflush(stdout);
|
||||||
exit(1);
|
exit(1);
|
||||||
}
|
}
|
||||||
fscanf(flagp, "%s", flag);
|
fscanf(flagp, "%s", flag);
|
||||||
fclose(flagp);
|
fclose(flagp);
|
||||||
printf("Congratulations!\nThe flag is: %s\n", flag);
|
printf("Congratulations!\nThe flag is: %s\n", flag);
|
||||||
|
fflush(stdout);
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
16
polictf/server/test.py
Normal file
16
polictf/server/test.py
Normal file
@ -0,0 +1,16 @@
|
|||||||
|
from pwn import *
|
||||||
|
import subprocess
|
||||||
|
|
||||||
|
key_re = re.compile(".*\"(.*)\".*")
|
||||||
|
r = remote("127.0.0.1", 8888)
|
||||||
|
|
||||||
|
first = r.recv()
|
||||||
|
key = key_re.match(first).group(1)
|
||||||
|
print("Using key: {}".format(key))
|
||||||
|
subprocess.check_call(["python3", "../../assembler/assembler.py", "{}".format(key), "../asms/decrypt.pstc", "./out.pasticciotto"])
|
||||||
|
with open("./out.pasticciotto") as f:
|
||||||
|
data = f.read()
|
||||||
|
r.send("{}\n".format(len(data)))
|
||||||
|
print(r.recv())
|
||||||
|
r.send("{}\n".format(data))
|
||||||
|
print(r.recv(100000))
|
40
polictf/tea_cversion/tea-decrypt.c
Normal file
40
polictf/tea_cversion/tea-decrypt.c
Normal file
@ -0,0 +1,40 @@
|
|||||||
|
#include <stdint.h>
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <unistd.h>
|
||||||
|
|
||||||
|
void decrypt(uint16_t *v) {
|
||||||
|
uint16_t v0 = v[0], v1 = v[1], i;
|
||||||
|
uint16_t k0 = 0x7065; // "pe"
|
||||||
|
uint16_t k1 = 0x7065; // "pe"
|
||||||
|
uint16_t k2 = 0x7275; // "ru"
|
||||||
|
uint16_t k3 = 0x6e73; // "ns"
|
||||||
|
for (i = 0; i < 128; i++) {
|
||||||
|
v1 -= ((v0 << 4) + k2) ^ (v0) ^ ((v0 >> 5) + k3);
|
||||||
|
v0 -= ((v1 << 4) + k0) ^ (v1) ^ ((v1 >> 5) + k1);
|
||||||
|
}
|
||||||
|
v[0] = v0;
|
||||||
|
v[1] = v1;
|
||||||
|
}
|
||||||
|
|
||||||
|
int main(int argc, char *argv[]) {
|
||||||
|
uint8_t buf[1000];
|
||||||
|
uint32_t buflen, i;
|
||||||
|
|
||||||
|
fprintf(stdout, "Length of the string?\n");
|
||||||
|
fflush(stdout);
|
||||||
|
fscanf(stdin, "%d", &buflen);
|
||||||
|
printf("Length: %d\n", buflen);
|
||||||
|
read(0, buf, buflen);
|
||||||
|
|
||||||
|
for (i = 0; i < buflen && i + 2 * (sizeof(uint16_t)) <= buflen;
|
||||||
|
i += sizeof(uint32_t)) {
|
||||||
|
decrypt((uint16_t *)&buf[i]);
|
||||||
|
}
|
||||||
|
for (i = 0; i < buflen; i++) {
|
||||||
|
fprintf(stdout, "buf[%d] = 0x%02x\n", i, buf[i]);
|
||||||
|
}
|
||||||
|
printf("STRING: %s\n", buf);
|
||||||
|
fflush(stdout);
|
||||||
|
}
|
@ -5,21 +5,15 @@
|
|||||||
#include <unistd.h>
|
#include <unistd.h>
|
||||||
|
|
||||||
void encrypt(uint16_t *v) {
|
void encrypt(uint16_t *v) {
|
||||||
uint16_t v0 = v[0], v1 = v[1], sum = 0, i; /* set up */
|
uint16_t v0 = v[0], v1 = v[1], i;
|
||||||
uint16_t delta = 0x626f;
|
|
||||||
uint16_t k0 = 0x7065; // "pe"
|
uint16_t k0 = 0x7065; // "pe"
|
||||||
uint16_t k1 = 0x7065; // "pe"
|
uint16_t k1 = 0x7065; // "pe"
|
||||||
uint16_t k2 = 0x7275; // "ru"
|
uint16_t k2 = 0x7275; // "ru"
|
||||||
uint16_t k3 = 0x6e73; // "ns"
|
uint16_t k3 = 0x6e73; // "ns"
|
||||||
// printf("v0: 0x%x, v1: 0x%x\n", v0, v1);
|
|
||||||
for (i = 0; i < 128; i++) {
|
for (i = 0; i < 128; i++) {
|
||||||
sum += delta;
|
v0 += ((v1 << 4) + k0) ^ (v1) ^ ((v1 >> 5) + k1);
|
||||||
v0 += ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1);
|
v1 += ((v0 << 4) + k2) ^ (v0) ^ ((v0 >> 5) + k3);
|
||||||
v1 += ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
|
|
||||||
// printf("Intermediate v0: 0x%x | v1: 0x%x\n", v0, v1);
|
|
||||||
}
|
}
|
||||||
// printf("SUM: 0x%x\n", sum);
|
|
||||||
// printf("v0: 0x%x, v1: 0x%x\n", v0, v1);
|
|
||||||
v[0] = v0;
|
v[0] = v0;
|
||||||
v[1] = v1;
|
v[1] = v1;
|
||||||
}
|
}
|
||||||
@ -27,6 +21,7 @@ void encrypt(uint16_t *v) {
|
|||||||
int main(int argc, char *argv[]) {
|
int main(int argc, char *argv[]) {
|
||||||
uint8_t *buf;
|
uint8_t *buf;
|
||||||
uint32_t buflen, i;
|
uint32_t buflen, i;
|
||||||
|
FILE *f;
|
||||||
if (argc != 2) {
|
if (argc != 2) {
|
||||||
printf("Usage: %s text_to_encrypt", argv[0]);
|
printf("Usage: %s text_to_encrypt", argv[0]);
|
||||||
exit(1);
|
exit(1);
|
||||||
@ -34,11 +29,12 @@ int main(int argc, char *argv[]) {
|
|||||||
buflen = strlen(argv[1]);
|
buflen = strlen(argv[1]);
|
||||||
buf = (uint8_t *)malloc(buflen);
|
buf = (uint8_t *)malloc(buflen);
|
||||||
memcpy(buf, argv[1], buflen);
|
memcpy(buf, argv[1], buflen);
|
||||||
for (i = 0; i < buflen; i++) {
|
|
||||||
|
for (i = 0; i < buflen && i + 2 * (sizeof(uint16_t)) <= buflen;
|
||||||
|
i += sizeof(uint32_t)) {
|
||||||
encrypt((uint16_t *)&buf[i]);
|
encrypt((uint16_t *)&buf[i]);
|
||||||
}
|
}
|
||||||
for (i = 0; i < buflen; i++) {
|
|
||||||
printf("%c", buf[i]);
|
write(1, buf, buflen);
|
||||||
}
|
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
@ -1,27 +0,0 @@
|
|||||||
#include <stdint.h>
|
|
||||||
#include <stdio.h>
|
|
||||||
#include <stdlib.h>
|
|
||||||
#include <unistd.h>
|
|
||||||
|
|
||||||
void decrypt(uint32_t *v, uint32_t *k) {
|
|
||||||
uint32_t v0 = v[0], v1 = v[1], sum = 0xC6EF3720, i; /* set up */
|
|
||||||
uint32_t delta = 0x9e3779b9; /* a key schedule constant */
|
|
||||||
uint32_t k0 = k[0], k1 = k[1], k2 = k[2], k3 = k[3]; /* cache key */
|
|
||||||
for (i = 0; i < 32; i++) { /* basic cycle start */
|
|
||||||
v1 -= ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
|
|
||||||
v0 -= ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1);
|
|
||||||
sum -= delta;
|
|
||||||
} /* end cycle */
|
|
||||||
v[0] = v0;
|
|
||||||
v[1] = v1;
|
|
||||||
}
|
|
||||||
|
|
||||||
int main(int argc, char *argv[]) {
|
|
||||||
if (argc != 3) {
|
|
||||||
printf("Usage: %s text_to_decrypt key", argv[0]);
|
|
||||||
exit(1);
|
|
||||||
}
|
|
||||||
decrypt((uint32_t*)argv[1], (uint32_t*)argv[2]);
|
|
||||||
printf("Result: %s", argv[1]);
|
|
||||||
return 0;
|
|
||||||
}
|
|
36
vm/vm.cpp
36
vm/vm.cpp
@ -91,41 +91,7 @@ void VM::status(void) {
|
|||||||
DBG_SUCC(("VM Status:\n"));
|
DBG_SUCC(("VM Status:\n"));
|
||||||
DBG_SUCC(("~~~~~~~~~~\n"));
|
DBG_SUCC(("~~~~~~~~~~\n"));
|
||||||
for (i = R0; i <= SP; i++) {
|
for (i = R0; i <= SP; i++) {
|
||||||
switch (i) {
|
DBG_INFO(("%s:\t0x%04x\n", getRegName(i), regs[i]));
|
||||||
case R0:
|
|
||||||
DBG_INFO(("R0:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
case R1:
|
|
||||||
DBG_INFO(("R1:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
case R2:
|
|
||||||
DBG_INFO(("R2:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
case R3:
|
|
||||||
DBG_INFO(("R3:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
case S0:
|
|
||||||
DBG_INFO(("S0:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
case S1:
|
|
||||||
DBG_INFO(("S1:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
case S2:
|
|
||||||
DBG_INFO(("S2:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
case S3:
|
|
||||||
DBG_INFO(("S3:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
case IP:
|
|
||||||
DBG_INFO(("IP:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
case RP:
|
|
||||||
DBG_INFO(("RP:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
case SP:
|
|
||||||
DBG_INFO(("SP:\t0x%x\n", this->regs[i]));
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
}
|
||||||
DBG_INFO(("Flags: ZF = %d, CF = %d\n", flags.ZF, flags.CF));
|
DBG_INFO(("Flags: ZF = %d, CF = %d\n", flags.ZF, flags.CF));
|
||||||
DBG_SUCC(("~~~~~~~~~~\n"));
|
DBG_SUCC(("~~~~~~~~~~\n"));
|
||||||
|
Loading…
Reference in New Issue
Block a user