| 1 | /*
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| 2 | * Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/dsa.h>
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| 11 | #include "internal/refcount.h"
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| 12 |
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| 13 | struct dsa_st {
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| 14 | /*
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| 15 | * This first variable is used to pick up errors where a DSA is passed
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| 16 | * instead of of a EVP_PKEY
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| 17 | */
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| 18 | int pad;
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| 19 | int32_t version;
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| 20 | BIGNUM *p;
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| 21 | BIGNUM *q; /* == 20 */
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| 22 | BIGNUM *g;
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| 23 | BIGNUM *pub_key; /* y public key */
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| 24 | BIGNUM *priv_key; /* x private key */
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| 25 | int flags;
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| 26 | /* Normally used to cache montgomery values */
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| 27 | BN_MONT_CTX *method_mont_p;
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| 28 | CRYPTO_REF_COUNT references;
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| 29 | CRYPTO_EX_DATA ex_data;
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| 30 | const DSA_METHOD *meth;
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| 31 | /* functional reference if 'meth' is ENGINE-provided */
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| 32 | ENGINE *engine;
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| 33 | CRYPTO_RWLOCK *lock;
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| 34 | };
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| 35 |
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| 36 | struct DSA_SIG_st {
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| 37 | BIGNUM *r;
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| 38 | BIGNUM *s;
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| 39 | };
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| 40 |
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| 41 | struct dsa_method {
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| 42 | char *name;
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| 43 | DSA_SIG *(*dsa_do_sign) (const unsigned char *dgst, int dlen, DSA *dsa);
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| 44 | int (*dsa_sign_setup) (DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
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| 45 | BIGNUM **rp);
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| 46 | int (*dsa_do_verify) (const unsigned char *dgst, int dgst_len,
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| 47 | DSA_SIG *sig, DSA *dsa);
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| 48 | int (*dsa_mod_exp) (DSA *dsa, BIGNUM *rr, const BIGNUM *a1,
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| 49 | const BIGNUM *p1, const BIGNUM *a2, const BIGNUM *p2,
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| 50 | const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont);
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| 51 | /* Can be null */
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| 52 | int (*bn_mod_exp) (DSA *dsa, BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
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| 53 | const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
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| 54 | int (*init) (DSA *dsa);
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| 55 | int (*finish) (DSA *dsa);
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| 56 | int flags;
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| 57 | void *app_data;
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| 58 | /* If this is non-NULL, it is used to generate DSA parameters */
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| 59 | int (*dsa_paramgen) (DSA *dsa, int bits,
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| 60 | const unsigned char *seed, int seed_len,
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| 61 | int *counter_ret, unsigned long *h_ret,
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| 62 | BN_GENCB *cb);
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| 63 | /* If this is non-NULL, it is used to generate DSA keys */
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| 64 | int (*dsa_keygen) (DSA *dsa);
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| 65 | };
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| 66 |
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| 67 | int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
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| 68 | const EVP_MD *evpmd, const unsigned char *seed_in,
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| 69 | size_t seed_len, unsigned char *seed_out,
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| 70 | int *counter_ret, unsigned long *h_ret,
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| 71 | BN_GENCB *cb);
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| 72 |
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| 73 | int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
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| 74 | const EVP_MD *evpmd, const unsigned char *seed_in,
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| 75 | size_t seed_len, int idx, unsigned char *seed_out,
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| 76 | int *counter_ret, unsigned long *h_ret,
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| 77 | BN_GENCB *cb);
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