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test_encryption.py
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test_encryption.py
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from pathlib import Path
import pytest
import PyPDF2
from PyPDF2 import PasswordType, PdfReader
from PyPDF2._encryption import AlgV5, CryptRC4
from PyPDF2.errors import DependencyError, PdfReadError
try:
from Crypto.Cipher import AES # noqa: F401
HAS_PYCRYPTODOME = True
except ImportError:
HAS_PYCRYPTODOME = False
TESTS_ROOT = Path(__file__).parent.resolve()
PROJECT_ROOT = TESTS_ROOT.parent
RESOURCE_ROOT = PROJECT_ROOT / "resources"
@pytest.mark.parametrize(
("name", "requres_pycryptodome"),
[
# unencrypted pdf
("unencrypted.pdf", False),
# created by `qpdf --encrypt "" "" 40 -- unencrypted.pdf r2-empty-password.pdf`:
("r2-empty-password.pdf", False),
# created by `qpdf --encrypt "" "" 128 -- unencrypted.pdf r3-empty-password.pdf`:
("r3-empty-password.pdf", False),
# created by `qpdf --encrypt "asdfzxcv" "" 40 -- unencrypted.pdf r2-user-password.pdf`:
("r2-user-password.pdf", False),
# created by `qpdf --encrypt "" "asdfzxcv" 40 -- unencrypted.pdf r2-user-password.pdf`:
("r2-owner-password.pdf", False),
# created by `qpdf --encrypt "asdfzxcv" "" 128 -- unencrypted.pdf r3-user-password.pdf`:
("r3-user-password.pdf", False),
# created by `qpdf --encrypt "asdfzxcv" "" 128 --force-V4 -- unencrypted.pdf r4-user-password.pdf`:
("r4-user-password.pdf", False),
# created by `qpdf --encrypt "" "asdfzxcv" 128 --force-V4 -- unencrypted.pdf r4-owner-password.pdf`:
("r4-owner-password.pdf", False),
# created by `qpdf --encrypt "asdfzxcv" "" 128 --use-aes=y -- unencrypted.pdf r4-aes-user-password.pdf`:
("r4-aes-user-password.pdf", True),
# # created by `qpdf --encrypt "" "" 256 --force-R5 -- unencrypted.pdf r5-empty-password.pdf`:
("r5-empty-password.pdf", True),
# # created by `qpdf --encrypt "asdfzxcv" "" 256 --force-R5 -- unencrypted.pdf r5-user-password.pdf`:
("r5-user-password.pdf", True),
# # created by `qpdf --encrypt "" "asdfzxcv" 256 --force-R5 -- unencrypted.pdf r5-owner-password.pdf`:
("r5-owner-password.pdf", True),
# created by `qpdf --encrypt "" "" 256 -- unencrypted.pdf r6-empty-password.pdf`:
("r6-empty-password.pdf", True),
# created by `qpdf --encrypt "asdfzxcv" "" 256 -- unencrypted.pdf r6-user-password.pdf`:
("r6-user-password.pdf", True),
# created by `qpdf --encrypt "" "asdfzxcv" 256 -- unencrypted.pdf r6-owner-password.pdf`:
("r6-owner-password.pdf", True),
],
)
def test_encryption(name, requres_pycryptodome):
inputfile = RESOURCE_ROOT / "encryption" / name
if requres_pycryptodome and not HAS_PYCRYPTODOME:
with pytest.raises(DependencyError) as exc:
ipdf = PyPDF2.PdfReader(inputfile)
ipdf.decrypt("asdfzxcv")
dd = dict(ipdf.metadata)
assert exc.value.args[0] == "PyCryptodome is required for AES algorithm"
return
else:
ipdf = PyPDF2.PdfReader(inputfile)
if str(inputfile).endswith("unencrypted.pdf"):
assert not ipdf.is_encrypted
else:
assert ipdf.is_encrypted
ipdf.decrypt("asdfzxcv")
assert len(ipdf.pages) == 1
dd = dict(ipdf.metadata)
# remove empty value entry
dd = {x[0]: x[1] for x in dd.items() if x[1]}
assert dd == {
"/Author": "cheng",
"/CreationDate": "D:20220414132421+05'24'",
"/Creator": "WPS Writer",
"/ModDate": "D:20220414132421+05'24'",
"/SourceModified": "D:20220414132421+05'24'",
"/Trapped": "/False",
}
@pytest.mark.parametrize(
("name", "user_passwd", "owner_passwd"),
[
# created by `qpdf --encrypt "foo" "bar" 256 -- unencrypted.pdf r6-both-passwords.pdf`
("r6-both-passwords.pdf", "foo", "bar"),
],
)
@pytest.mark.skipif(not HAS_PYCRYPTODOME, reason="No pycryptodome")
def test_both_password(name, user_passwd, owner_passwd):
inputfile = RESOURCE_ROOT / "encryption" / name
ipdf = PyPDF2.PdfReader(inputfile)
assert ipdf.is_encrypted
assert ipdf.decrypt(user_passwd) == PasswordType.USER_PASSWORD
assert ipdf.decrypt(owner_passwd) == PasswordType.OWNER_PASSWORD
assert len(ipdf.pages) == 1
@pytest.mark.parametrize(
("pdffile", "password"),
[
("crazyones-encrypted-256.pdf", "password"),
("crazyones-encrypted-256.pdf", b"password"),
],
)
@pytest.mark.skipif(not HAS_PYCRYPTODOME, reason="No pycryptodome")
def test_get_page_of_encrypted_file_new_algorithm(pdffile, password):
"""
Check if we can read a page of an encrypted file.
This is a regression test for issue 327:
IndexError for get_page() of decrypted file
"""
path = RESOURCE_ROOT / pdffile
PyPDF2.PdfReader(path, password=password).pages[0]
@pytest.mark.parametrize(
"names",
[
(
[
"unencrypted.pdf",
"r3-user-password.pdf",
"r4-aes-user-password.pdf",
"r5-user-password.pdf",
]
),
],
)
@pytest.mark.skipif(not HAS_PYCRYPTODOME, reason="No pycryptodome")
def test_encryption_merge(names):
merger = PyPDF2.PdfMerger()
files = [RESOURCE_ROOT / "encryption" / x for x in names]
pdfs = [PyPDF2.PdfReader(x) for x in files]
for pdf in pdfs:
if pdf.is_encrypted:
pdf.decrypt("asdfzxcv")
merger.append(pdf)
# no need to write to file
merger.close()
@pytest.mark.parametrize(
"cryptcls",
[
CryptRC4,
],
)
def test_encrypt_decrypt_class(cryptcls):
message = b"Hello World"
key = bytes(0 for _ in range(128)) # b"secret key"
crypt = cryptcls(key)
assert crypt.decrypt(crypt.encrypt(message)) == message
def test_decrypt_not_decrypted_pdf():
path = RESOURCE_ROOT / "crazyones.pdf"
with pytest.raises(PdfReadError) as exc:
PdfReader(path, password="nonexistant")
assert exc.value.args[0] == "Not encrypted file"
def test_generate_values():
"""
This test only checks if there is an exception.
It does not verify that the content is correct.
"""
if not HAS_PYCRYPTODOME:
return
key = b"0123456789123451"
values = AlgV5.generate_values(
user_password=b"foo",
owner_password=b"bar",
key=key,
p=0,
metadata_encrypted=True,
)
assert values == {
"/U": values["/U"],
"/UE": values["/UE"],
"/O": values["/O"],
"/OE": values["/OE"],
"/Perms": values["/Perms"],
}