1/*
2 * Copyright 2007-2016 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/dsa.h>
11#include "internal/refcount.h"
12
13struct dsa_st {
14 /*
15 * This first variable is used to pick up errors where a DSA is passed
16 * instead of of a EVP_PKEY
17 */
18 int pad;
19 int32_t version;
20 BIGNUM *p;
21 BIGNUM *q; /* == 20 */
22 BIGNUM *g;
23 BIGNUM *pub_key; /* y public key */
24 BIGNUM *priv_key; /* x private key */
25 int flags;
26 /* Normally used to cache montgomery values */
27 BN_MONT_CTX *method_mont_p;
28 CRYPTO_REF_COUNT references;
29 CRYPTO_EX_DATA ex_data;
30 const DSA_METHOD *meth;
31 /* functional reference if 'meth' is ENGINE-provided */
32 ENGINE *engine;
33 CRYPTO_RWLOCK *lock;
34
35 /* Provider data */
36 size_t dirty_cnt; /* If any key material changes, increment this */
37};
38
39struct DSA_SIG_st {
40 BIGNUM *r;
41 BIGNUM *s;
42};
43
44struct dsa_method {
45 char *name;
46 DSA_SIG *(*dsa_do_sign) (const unsigned char *dgst, int dlen, DSA *dsa);
47 int (*dsa_sign_setup) (DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
48 BIGNUM **rp);
49 int (*dsa_do_verify) (const unsigned char *dgst, int dgst_len,
50 DSA_SIG *sig, DSA *dsa);
51 int (*dsa_mod_exp) (DSA *dsa, BIGNUM *rr, const BIGNUM *a1,
52 const BIGNUM *p1, const BIGNUM *a2, const BIGNUM *p2,
53 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont);
54 /* Can be null */
55 int (*bn_mod_exp) (DSA *dsa, BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
56 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
57 int (*init) (DSA *dsa);
58 int (*finish) (DSA *dsa);
59 int flags;
60 void *app_data;
61 /* If this is non-NULL, it is used to generate DSA parameters */
62 int (*dsa_paramgen) (DSA *dsa, int bits,
63 const unsigned char *seed, int seed_len,
64 int *counter_ret, unsigned long *h_ret,
65 BN_GENCB *cb);
66 /* If this is non-NULL, it is used to generate DSA keys */
67 int (*dsa_keygen) (DSA *dsa);
68};
69
70int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
71 const EVP_MD *evpmd, const unsigned char *seed_in,
72 size_t seed_len, unsigned char *seed_out,
73 int *counter_ret, unsigned long *h_ret,
74 BN_GENCB *cb);
75
76int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
77 const EVP_MD *evpmd, const unsigned char *seed_in,
78 size_t seed_len, int idx, unsigned char *seed_out,
79 int *counter_ret, unsigned long *h_ret,
80 BN_GENCB *cb);
81