def process_tag_decrypt(rule_file_name, tag, data):
rule_file = RuleXml(rule_file_name)
tag_decrypt_nodes = rule_file.get_nodes(rule_file.root_element,
'TagDecrypt')
for node in tag_decrypt_nodes:
attrs = rule_file.get_attributes(node)
if attrs['tag'] == tag:
start_pos = 0
data_len = 0
delete80 = False
is_bcd = False
data = algorithm.des3_ecb_decrypt(attrs['key'], data)
start_pos = int(attrs['startPos']) if 'startPos' in attrs else 0
data_len = int(attrs['len']) if 'len' in attrs else len(data)
delete80 = True if 'delete80' in attrs else False
is_bcd = True if 'bcd' in attrs else False
if delete80:
index = data.rfind('80')
if index != -1:
data = data[:42]
if is_bcd:
data = utils.bcd_to_str(data)
data = data[start_pos:start_pos + data_len]
return data
return data
def process_tag_decrypt(rule_file_name,tag,data):
rule_file = RuleXml(rule_file_name)
tag_decrypt_nodes = rule_file.get_nodes(rule_file.root_element,'TagDecrypt')
for node in tag_decrypt_nodes:
attrs = rule_file.get_attributes(node)
if attrs['tag'] == tag:
data = algorithm.des3_ecb_decrypt(attrs['key'],data)
if 'startPos' in attrs:
start_pos = int(attrs['startPos'])
else:
start_pos = 0
if 'len' in attrs:
data_len = int(attrs['len'])
else:
data_len = len(data)
data = data[start_pos : start_pos + data_len]
return data
return data