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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 OPENSSL_DSA_MAX_MODULUS_BITS 3072
83
84#define DSA_FLAG_CACHE_MONT_P 0x01
85#define DSA_FLAG_NO_EXP_CONSTTIME 0x02 /* new with 0.9.7h; the built-in DSA
86 * implementation now uses constant time
87 * modular exponentiation for secret exponents
88 * by default. This flag causes the
89 * faster variable sliding window method to
90 * be used for all exponents.
91 */
92
93/* If this flag is set external DSA_METHOD callbacks are allowed in FIPS mode
94 * it is then the applications responsibility to ensure the external method
95 * is compliant.
96 */
97
98#define DSA_FLAG_FIPS_EXTERNAL_METHOD_ALLOW 0x04
99
100#if defined(OPENSSL_FIPS)
101#define FIPS_DSA_SIZE_T int
102#endif
103
104#ifdef __cplusplus
105extern "C" {
106#endif
107
108typedef struct dsa_st DSA;
109
110typedef struct DSA_SIG_st
111 {
112 BIGNUM *r;
113 BIGNUM *s;
114 } DSA_SIG;
115
116typedef struct dsa_method {
117 const char *name;
118 DSA_SIG * (*dsa_do_sign)(const unsigned char *dgst, int dlen, DSA *dsa);
119 int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
120 BIGNUM **rp);
121 int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
122 DSA_SIG *sig, DSA *dsa);
123 int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
124 BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
125 BN_MONT_CTX *in_mont);
126 int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
127 const BIGNUM *m, BN_CTX *ctx,
128 BN_MONT_CTX *m_ctx); /* Can be null */
129 int (*init)(DSA *dsa);
130 int (*finish)(DSA *dsa);
131 int flags;
132 char *app_data;
133} DSA_METHOD;
134
135struct dsa_st
136 {
137 /* This first variable is used to pick up errors where
138 * a DSA is passed instead of of a EVP_PKEY */
139 int pad;
140 long version;
141 int write_params;
142 BIGNUM *p;
143 BIGNUM *q; /* == 20 */
144 BIGNUM *g;
145
146 BIGNUM *pub_key; /* y public key */
147 BIGNUM *priv_key; /* x private key */
148
149 BIGNUM *kinv; /* Signing pre-calc */
150 BIGNUM *r; /* Signing pre-calc */
151
152 int flags;
153 /* Normally used to cache montgomery values */
154 char *method_mont_p;
155 int references;
156 CRYPTO_EX_DATA ex_data;
157 const DSA_METHOD *meth;
158 /* functional reference if 'meth' is ENGINE-provided */
159 ENGINE *engine;
160 };
161
162#define DSAparams_dup(x) (DSA *)ASN1_dup((int (*)())i2d_DSAparams, \
163 (char *(*)())d2i_DSAparams,(char *)(x))
164#define d2i_DSAparams_fp(fp,x) (DSA *)ASN1_d2i_fp((char *(*)())DSA_new, \
165 (char *(*)())d2i_DSAparams,(fp),(unsigned char **)(x))
166#define i2d_DSAparams_fp(fp,x) ASN1_i2d_fp(i2d_DSAparams,(fp), \
167 (unsigned char *)(x))
168#define d2i_DSAparams_bio(bp,x) (DSA *)ASN1_d2i_bio((char *(*)())DSA_new, \
169 (char *(*)())d2i_DSAparams,(bp),(unsigned char **)(x))
170#define i2d_DSAparams_bio(bp,x) ASN1_i2d_bio(i2d_DSAparams,(bp), \
171 (unsigned char *)(x))
172
173
174DSA_SIG * DSA_SIG_new(void);
175void DSA_SIG_free(DSA_SIG *a);
176int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
177DSA_SIG * d2i_DSA_SIG(DSA_SIG **v, const unsigned char **pp, long length);
178
179DSA_SIG * DSA_do_sign(const unsigned char *dgst,int dlen,DSA *dsa);
180int DSA_do_verify(const unsigned char *dgst,int dgst_len,
181 DSA_SIG *sig,DSA *dsa);
182
183const DSA_METHOD *DSA_OpenSSL(void);
184
185void DSA_set_default_method(const DSA_METHOD *);
186const DSA_METHOD *DSA_get_default_method(void);
187int DSA_set_method(DSA *dsa, const DSA_METHOD *);
188
189DSA * DSA_new(void);
190DSA * DSA_new_method(ENGINE *engine);
191void DSA_free (DSA *r);
192/* "up" the DSA object's reference count */
193int DSA_up_ref(DSA *r);
194int DSA_size(const DSA *);
195 /* next 4 return -1 on error */
196int DSA_sign_setup( DSA *dsa,BN_CTX *ctx_in,BIGNUM **kinvp,BIGNUM **rp);
197int DSA_sign(int type,const unsigned char *dgst,int dlen,
198 unsigned char *sig, unsigned int *siglen, DSA *dsa);
199int DSA_verify(int type,const unsigned char *dgst,int dgst_len,
200 const unsigned char *sigbuf, int siglen, DSA *dsa);
201int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
202 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
203int DSA_set_ex_data(DSA *d, int idx, void *arg);
204void *DSA_get_ex_data(DSA *d, int idx);
205
206DSA * d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length);
207DSA * d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length);
208DSA * d2i_DSAparams(DSA **a, const unsigned char **pp, long length);
209DSA * DSA_generate_parameters(int bits,
210 unsigned char *seed,int seed_len,
211 int *counter_ret, unsigned long *h_ret,void
212 (*callback)(int, int, void *),void *cb_arg);
213int DSA_generate_key(DSA *a);
214int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
215int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
216int i2d_DSAparams(const DSA *a,unsigned char **pp);
217
218#ifndef OPENSSL_NO_BIO
219int DSAparams_print(BIO *bp, const DSA *x);
220int DSA_print(BIO *bp, const DSA *x, int off);
221#endif
222#ifndef OPENSSL_NO_FP_API
223int DSAparams_print_fp(FILE *fp, const DSA *x);
224int DSA_print_fp(FILE *bp, const DSA *x, int off);
225#endif
226
227#define DSS_prime_checks 50
228/* Primality test according to FIPS PUB 186[-1], Appendix 2.1:
229 * 50 rounds of Rabin-Miller */
230#define DSA_is_prime(n, callback, cb_arg) \
231 BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg)
232
233#ifndef OPENSSL_NO_DH
234/* Convert DSA structure (key or just parameters) into DH structure
235 * (be careful to avoid small subgroup attacks when using this!) */
236DH *DSA_dup_DH(const DSA *r);
237#endif
238
239/* BEGIN ERROR CODES */
240/* The following lines are auto generated by the script mkerr.pl. Any changes
241 * made after this point may be overwritten when the script is next run.
242 */
243void ERR_load_DSA_strings(void);
244
245/* Error codes for the DSA functions. */
246
247/* Function codes. */
248#define DSA_F_D2I_DSA_SIG 110
249#define DSA_F_DSAPARAMS_PRINT 100
250#define DSA_F_DSAPARAMS_PRINT_FP 101
251#define DSA_F_DSA_DO_SIGN 112
252#define DSA_F_DSA_DO_VERIFY 113
253#define DSA_F_DSA_NEW_METHOD 103
254#define DSA_F_DSA_PRINT 104
255#define DSA_F_DSA_PRINT_FP 105
256#define DSA_F_DSA_SIGN 106
257#define DSA_F_DSA_SIGN_SETUP 107
258#define DSA_F_DSA_SIG_NEW 109
259#define DSA_F_DSA_VERIFY 108
260#define DSA_F_I2D_DSA_SIG 111
261#define DSA_F_SIG_CB 114
262
263/* Reason codes. */
264#define DSA_R_BAD_Q_VALUE 102
265#define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 100
266#define DSA_R_MISSING_PARAMETERS 101
267#define DSA_R_MODULUS_TOO_LARGE 103
268
269#ifdef __cplusplus
270}
271#endif
272#endif