def encrypt(self, prev, password, rc):
encrypt = prev.trailer["/Encrypt"].getObject()
if encrypt["/V"] == 2:
rev = 3
keylen = 128 // 8
else:
rev = 2
keylen = 40 // 8
P = encrypt["/P"].getObject()
O = encrypt["/O"].getObject()
ID_1 = prev.trailer["/ID"].getObject()[0]
real_U = encrypt["/U"].getObject().original_bytes
if rev == 2:
U, key = pdf._alg34(password, O, P, ID_1)
else:
assert rev == 3
U, key = pdf._alg35(
password,
rev,
keylen,
O,
P,
ID_1,
encrypt.get("/EncryptMetadata",
pdf.BooleanObject(False)).getObject(),
)
U, real_U = U[:16], real_U[:16]
assert U == real_U
self._encrypt_key = key
def encrypt(self, prev, password, rc):
encrypt = prev.trailer["/Encrypt"].getObject()
if encrypt["/V"] == 2:
rev = 3
keylen = int(128 / 8)
else:
rev = 2
keylen = int(40 / 8)
P = encrypt["/P"]
O = encrypt["/O"]
ID_1 = prev.trailer["/ID"][0]
if rev == 2:
U, key = pdf._alg34(password, O, P, ID_1)
else:
assert rev == 3
U, key = pdf._alg35(password, rev, keylen, O, P, ID_1, False)
self._encrypt_key = key