1 | /* |
2 | * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at |
7 | * https://www.openssl.org/source/license.html |
8 | */ |
9 | |
10 | #include <openssl/dh.h> |
11 | #include "internal/refcount.h" |
12 | |
13 | #define DH_MIN_MODULUS_BITS 512 |
14 | |
15 | struct dh_st { |
16 | /* |
17 | * This first argument is used to pick up errors when a DH is passed |
18 | * instead of a EVP_PKEY |
19 | */ |
20 | int pad; |
21 | int version; |
22 | BIGNUM *p; |
23 | BIGNUM *g; |
24 | int32_t length; /* optional */ |
25 | BIGNUM *pub_key; /* g^x % p */ |
26 | BIGNUM *priv_key; /* x */ |
27 | int flags; |
28 | BN_MONT_CTX *method_mont_p; |
29 | /* Place holders if we want to do X9.42 DH */ |
30 | BIGNUM *q; |
31 | BIGNUM *j; |
32 | unsigned char *seed; |
33 | int seedlen; |
34 | BIGNUM *counter; |
35 | CRYPTO_REF_COUNT references; |
36 | CRYPTO_EX_DATA ex_data; |
37 | const DH_METHOD *meth; |
38 | ENGINE *engine; |
39 | CRYPTO_RWLOCK *lock; |
40 | |
41 | /* Provider data */ |
42 | size_t dirty_cnt; /* If any key material changes, increment this */ |
43 | }; |
44 | |
45 | struct dh_method { |
46 | char *name; |
47 | /* Methods here */ |
48 | int (*generate_key) (DH *dh); |
49 | int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh); |
50 | |
51 | /* Can be null */ |
52 | int (*bn_mod_exp) (const DH *dh, BIGNUM *r, const BIGNUM *a, |
53 | const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, |
54 | BN_MONT_CTX *m_ctx); |
55 | int (*init) (DH *dh); |
56 | int (*finish) (DH *dh); |
57 | int flags; |
58 | char *app_data; |
59 | /* If this is non-NULL, it will be used to generate parameters */ |
60 | int (*generate_params) (DH *dh, int prime_len, int generator, |
61 | BN_GENCB *cb); |
62 | }; |
63 | |
64 | int dh_buf2key(DH *key, const unsigned char *buf, size_t len); |
65 | size_t dh_key2buf(const DH *dh, unsigned char **pbuf); |
66 | |