def run_veririca_pdf_tem_assinatura(self):
global sss
sss = 1
def tree_print(field_name, fields):
global sss
ss = " "
print(ss * sss, field_name, '.............')
if not isinstance(fields, dict):
ByteStringObject
if field_name == '/Contents':
try:
signed_data = cms.ContentInfo.load(fields)['content']
for cert in signed_data['certificates']:
print('cert.issuer:',
cert.native['tbs_certificate']['issuer'])
print('cert.subject:',
cert.native['tbs_certificate']['subject'])
except Exception as e:
pass
with open(
'/home/leandro/Downloads/content{}.ext'.format(
sss), 'wb') as f:
f.write(fields)
f.close()
return
else:
print(' ' * sss, fields)
return
for field_name, value in fields.items():
sss += 2
tree_print(field_name, value)
sss -= 2
ifile = '/home/leandro/Downloads/016 - Projeto da LDO 2021_Assinado.pdf'
ifile = '/home/leandro/Downloads/plol_violencia_nas_escolas.pdf'
(hashok, signatureok, certok) = pdf.verify(open(ifile, 'rb').read())
print('signature ok?', signatureok)
print('hash ok?', hashok)
print('cert ok?', certok)
r = PdfFileReader(open(ifile, "rb"))
fields = r.getFields()
tree_print('file', fields)
def run_signed_name_and_date_extract(file):
signs = {}
fields = {}
pdfdata = file.read()
# se não tem byterange então não é assinado
byterange = []
n = -1
while True:
n = pdfdata.find(b"/ByteRange", n + 1)
if n == -1:
break
byterange.append(n)
if not byterange:
return signs
# tenta extrair via /Fields
try:
pdf = PdfFileReader(file)
fields = pdf.getFields()
except Exception as e:
try:
pdf = PdfFileReader(file, strict=False)
fields = pdf.getFields()
except Exception as ee:
fields = ee
try:
# se a extração via /Fields ocorrer sem erros e forem capturadas
# tantas assinaturas quanto byteranges
if isinstance(fields, dict):
signs = run_signed_name_and_date_via_fields(fields)
if len(signs) == len(byterange):
return signs
except Exception as e:
pass
for n in byterange:
start = pdfdata.find(b"[", n)
stop = pdfdata.find(b"]", start)
assert n != -1 and start != -1 and stop != -1
n += 1
br = [int(i, 10) for i in pdfdata[start + 1:stop].split()]
contents = pdfdata[br[0] + br[1] + 1:br[2] - 1]
bcontents = bytes.fromhex(contents.decode("utf8"))
data1 = pdfdata[br[0]:br[0] + br[1]]
data2 = pdfdata[br[2]:br[2] + br[3]]
#signedData = data1 + data2
nome = 'Nome do assinante não localizado.'
try:
signed_data = cms.ContentInfo.load(bcontents)['content']
oun_old = []
for cert in signed_data['certificates']:
subject = cert.native['tbs_certificate']['subject']
oun = subject['organizational_unit_name']
if isinstance(oun, str):
continue
if len(oun) > len(oun_old):
oun_old = oun
nome = subject['common_name'].split(':')[0]
if nome not in signs:
signs[nome] = timezone.localtime()
except:
pass
return signs