1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
| from Crypto.Util._raw_api import (load_pycryptodome_raw_lib, c_size_t,
| c_uint8_ptr)
|
|
| _raw_pkcs1_decode = load_pycryptodome_raw_lib("Crypto.Cipher._pkcs1_decode",
| """
| int pkcs1_decode(const uint8_t *em, size_t len_em,
| const uint8_t *sentinel, size_t len_sentinel,
| size_t expected_pt_len,
| uint8_t *output);
|
| int oaep_decode(const uint8_t *em,
| size_t em_len,
| const uint8_t *lHash,
| size_t hLen,
| const uint8_t *db,
| size_t db_len);
| """)
|
|
| def pkcs1_decode(em, sentinel, expected_pt_len, output):
| if len(em) != len(output):
| raise ValueError("Incorrect output length")
|
| ret = _raw_pkcs1_decode.pkcs1_decode(c_uint8_ptr(em),
| c_size_t(len(em)),
| c_uint8_ptr(sentinel),
| c_size_t(len(sentinel)),
| c_size_t(expected_pt_len),
| c_uint8_ptr(output))
| return ret
|
|
| def oaep_decode(em, lHash, db):
| ret = _raw_pkcs1_decode.oaep_decode(c_uint8_ptr(em),
| c_size_t(len(em)),
| c_uint8_ptr(lHash),
| c_size_t(len(lHash)),
| c_uint8_ptr(db),
| c_size_t(len(db)))
| return ret
|
|
