Skip to content

add crc16 support other polynomials and fix a slip #70

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
Tengfei1010 wants to merge 1 commit into
base: sulley_refactor
Choose a base branch
from
Open

add crc16 support other polynomials and fix a slip #70

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 8 additions & 2 deletions sulley/helpers.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -57,17 +57,23 @@ def calculate_four_byte_padding(string, character="\x00"):
return character * ((4 - (len(string) & 3)) & 3)


def crc16(string, value=0):
def crc16(string, value=0xa001):
"""
CRC-16 poly: p(x) = x**16 + x**15 + x**2 + 1
@:param value: CRC-16
P_16 0xa001
P_CCITT 0x1021
P-DNP 0xa6bc
p_KERMIT 0x8408
P_SICK 0x8005
"""
crc16_table = []
for byte in range(256):
crc = 0

for bit in range(8):
if (byte ^ crc) & 1:
crc = (crc >> 1) ^ 0xa001 # polly
crc = (crc >> 1) ^ value # poly
else:
crc >>= 1

Expand Down
2 changes: 1 addition & 1 deletion sulley/sessions.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -322,7 +322,7 @@ def export_file(self):

data = {
"session_filename": self.session_filename,
"skip": self.total_mutant_index,
"skip": self.skip,
"sleep_time": self.sleep_time,
"restart_sleep_time": self.restart_sleep_time,
"proto": self.proto,
Expand Down