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1/* crypto/dsa/dsa.h */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59/*
60 * The DSS routines are based on patches supplied by
61 * Steven Schoch <schoch@sheba.arc.nasa.gov>. He basically did the
62 * work and I have just tweaked them a little to fit into my
63 * stylistic vision for SSLeay :-) */
64
65#ifndef HEADER_DSA_H
66#define HEADER_DSA_H
67
68#ifdef OPENSSL_NO_DSA
69#error DSA is disabled.
70#endif
71
72#ifndef OPENSSL_NO_BIO
73#include <openssl/bio.h>
74#endif
75#include <openssl/bn.h>
76#include <openssl/crypto.h>
77#include <openssl/ossl_typ.h>
78#ifndef OPENSSL_NO_DH
79# include <openssl/dh.h>
80#endif
81
82#define DSA_FLAG_CACHE_MONT_P 0x01
83#define DSA_FLAG_NO_EXP_CONSTTIME 0x02 /* new with 0.9.7h; the built-in DSA
84 * implementation now uses constant time
85 * modular exponentiation for secret exponents
86 * by default. This flag causes the
87 * faster variable sliding window method to
88 * be used for all exponents.
89 */
90
91/* If this flag is set external DSA_METHOD callbacks are allowed in FIPS mode
92 * it is then the applications responsibility to ensure the external method
93 * is compliant.
94 */
95
96#define DSA_FLAG_FIPS_EXTERNAL_METHOD_ALLOW 0x04
97
98#if defined(OPENSSL_FIPS)
99#define FIPS_DSA_SIZE_T int
100#endif
101
102#ifdef __cplusplus
103extern "C" {
104#endif
105
106typedef struct dsa_st DSA;
107
108typedef struct DSA_SIG_st
109 {
110 BIGNUM *r;
111 BIGNUM *s;
112 } DSA_SIG;
113
114typedef struct dsa_method {
115 const char *name;
116 DSA_SIG * (*dsa_do_sign)(const unsigned char *dgst, int dlen, DSA *dsa);
117 int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
118 BIGNUM **rp);
119 int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
120 DSA_SIG *sig, DSA *dsa);
121 int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
122 BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
123 BN_MONT_CTX *in_mont);
124 int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
125 const BIGNUM *m, BN_CTX *ctx,
126 BN_MONT_CTX *m_ctx); /* Can be null */
127 int (*init)(DSA *dsa);
128 int (*finish)(DSA *dsa);
129 int flags;
130 char *app_data;
131} DSA_METHOD;
132
133struct dsa_st
134 {
135 /* This first variable is used to pick up errors where
136 * a DSA is passed instead of of a EVP_PKEY */
137 int pad;
138 long version;
139 int write_params;
140 BIGNUM *p;
141 BIGNUM *q; /* == 20 */
142 BIGNUM *g;
143
144 BIGNUM *pub_key; /* y public key */
145 BIGNUM *priv_key; /* x private key */
146
147 BIGNUM *kinv; /* Signing pre-calc */
148 BIGNUM *r; /* Signing pre-calc */
149
150 int flags;
151 /* Normally used to cache montgomery values */
152 char *method_mont_p;
153 int references;
154 CRYPTO_EX_DATA ex_data;
155 const DSA_METHOD *meth;
156 /* functional reference if 'meth' is ENGINE-provided */
157 ENGINE *engine;
158 };
159
160#define DSAparams_dup(x) (DSA *)ASN1_dup((int (*)())i2d_DSAparams, \
161 (char *(*)())d2i_DSAparams,(char *)(x))
162#define d2i_DSAparams_fp(fp,x) (DSA *)ASN1_d2i_fp((char *(*)())DSA_new, \
163 (char *(*)())d2i_DSAparams,(fp),(unsigned char **)(x))
164#define i2d_DSAparams_fp(fp,x) ASN1_i2d_fp(i2d_DSAparams,(fp), \
165 (unsigned char *)(x))
166#define d2i_DSAparams_bio(bp,x) (DSA *)ASN1_d2i_bio((char *(*)())DSA_new, \
167 (char *(*)())d2i_DSAparams,(bp),(unsigned char **)(x))
168#define i2d_DSAparams_bio(bp,x) ASN1_i2d_bio(i2d_DSAparams,(bp), \
169 (unsigned char *)(x))
170
171
172DSA_SIG * DSA_SIG_new(void);
173void DSA_SIG_free(DSA_SIG *a);
174int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
175DSA_SIG * d2i_DSA_SIG(DSA_SIG **v, const unsigned char **pp, long length);
176
177DSA_SIG * DSA_do_sign(const unsigned char *dgst,int dlen,DSA *dsa);
178int DSA_do_verify(const unsigned char *dgst,int dgst_len,
179 DSA_SIG *sig,DSA *dsa);
180
181const DSA_METHOD *DSA_OpenSSL(void);
182
183void DSA_set_default_method(const DSA_METHOD *);
184const DSA_METHOD *DSA_get_default_method(void);
185int DSA_set_method(DSA *dsa, const DSA_METHOD *);
186
187DSA * DSA_new(void);
188DSA * DSA_new_method(ENGINE *engine);
189void DSA_free (DSA *r);
190/* "up" the DSA object's reference count */
191int DSA_up_ref(DSA *r);
192int DSA_size(const DSA *);
193 /* next 4 return -1 on error */
194int DSA_sign_setup( DSA *dsa,BN_CTX *ctx_in,BIGNUM **kinvp,BIGNUM **rp);
195int DSA_sign(int type,const unsigned char *dgst,int dlen,
196 unsigned char *sig, unsigned int *siglen, DSA *dsa);
197int DSA_verify(int type,const unsigned char *dgst,int dgst_len,
198 const unsigned char *sigbuf, int siglen, DSA *dsa);
199int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
200 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
201int DSA_set_ex_data(DSA *d, int idx, void *arg);
202void *DSA_get_ex_data(DSA *d, int idx);
203
204DSA * d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length);
205DSA * d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length);
206DSA * d2i_DSAparams(DSA **a, const unsigned char **pp, long length);
207DSA * DSA_generate_parameters(int bits,
208 unsigned char *seed,int seed_len,
209 int *counter_ret, unsigned long *h_ret,void
210 (*callback)(int, int, void *),void *cb_arg);
211int DSA_generate_key(DSA *a);
212int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
213int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
214int i2d_DSAparams(const DSA *a,unsigned char **pp);
215
216#ifndef OPENSSL_NO_BIO
217int DSAparams_print(BIO *bp, const DSA *x);
218int DSA_print(BIO *bp, const DSA *x, int off);
219#endif
220#ifndef OPENSSL_NO_FP_API
221int DSAparams_print_fp(FILE *fp, const DSA *x);
222int DSA_print_fp(FILE *bp, const DSA *x, int off);
223#endif
224
225#define DSS_prime_checks 50
226/* Primality test according to FIPS PUB 186[-1], Appendix 2.1:
227 * 50 rounds of Rabin-Miller */
228#define DSA_is_prime(n, callback, cb_arg) \
229 BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg)
230
231#ifndef OPENSSL_NO_DH
232/* Convert DSA structure (key or just parameters) into DH structure
233 * (be careful to avoid small subgroup attacks when using this!) */
234DH *DSA_dup_DH(const DSA *r);
235#endif
236
237/* BEGIN ERROR CODES */
238/* The following lines are auto generated by the script mkerr.pl. Any changes
239 * made after this point may be overwritten when the script is next run.
240 */
241void ERR_load_DSA_strings(void);
242
243/* Error codes for the DSA functions. */
244
245/* Function codes. */
246#define DSA_F_D2I_DSA_SIG 110
247#define DSA_F_DSAPARAMS_PRINT 100
248#define DSA_F_DSAPARAMS_PRINT_FP 101
249#define DSA_F_DSA_DO_SIGN 112
250#define DSA_F_DSA_DO_VERIFY 113
251#define DSA_F_DSA_NEW_METHOD 103
252#define DSA_F_DSA_PRINT 104
253#define DSA_F_DSA_PRINT_FP 105
254#define DSA_F_DSA_SIGN 106
255#define DSA_F_DSA_SIGN_SETUP 107
256#define DSA_F_DSA_SIG_NEW 109
257#define DSA_F_DSA_VERIFY 108
258#define DSA_F_I2D_DSA_SIG 111
259#define DSA_F_SIG_CB 114
260
261/* Reason codes. */
262#define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 100
263#define DSA_R_MISSING_PARAMETERS 101
264
265#ifdef __cplusplus
266}
267#endif
268#endif
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