dsa.h revision 296465 
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# include <openssl/e_os2.h>
69
70# ifdef OPENSSL_NO_DSA
71#  error DSA is disabled.
72# endif
73
74# ifndef OPENSSL_NO_BIO
75#  include <openssl/bio.h>
76# endif
77# include <openssl/crypto.h>
78# include <openssl/ossl_typ.h>
79
80# ifndef OPENSSL_NO_DEPRECATED
81#  include <openssl/bn.h>
82#  ifndef OPENSSL_NO_DH
83#   include <openssl/dh.h>
84#  endif
85# endif
86
87# ifndef OPENSSL_DSA_MAX_MODULUS_BITS
88#  define OPENSSL_DSA_MAX_MODULUS_BITS   10000
89# endif
90
91# define OPENSSL_DSA_FIPS_MIN_MODULUS_BITS 1024
92
93# define DSA_FLAG_CACHE_MONT_P   0x01
94/*
95 * new with 0.9.7h; the built-in DSA implementation now uses constant time
96 * modular exponentiation for secret exponents by default. This flag causes
97 * the faster variable sliding window method to be used for all exponents.
98 */
99# define DSA_FLAG_NO_EXP_CONSTTIME       0x02
100
101/*
102 * If this flag is set the DSA method is FIPS compliant and can be used in
103 * FIPS mode. This is set in the validated module method. If an application
104 * sets this flag in its own methods it is its reposibility to ensure the
105 * result is compliant.
106 */
107
108# define DSA_FLAG_FIPS_METHOD                    0x0400
109
110/*
111 * If this flag is set the operations normally disabled in FIPS mode are
112 * permitted it is then the applications responsibility to ensure that the
113 * usage is compliant.
114 */
115
116# define DSA_FLAG_NON_FIPS_ALLOW                 0x0400
117
118# ifdef OPENSSL_FIPS
119#  define FIPS_DSA_SIZE_T int
120# endif
121
122#ifdef  __cplusplus
123extern "C" {
124#endif
125
126/* Already defined in ossl_typ.h */
127/* typedef struct dsa_st DSA; */
128/* typedef struct dsa_method DSA_METHOD; */
129
130typedef struct DSA_SIG_st {
131    BIGNUM *r;
132    BIGNUM *s;
133} DSA_SIG;
134
135struct dsa_method {
136    const char *name;
137    DSA_SIG *(*dsa_do_sign) (const unsigned char *dgst, int dlen, DSA *dsa);
138    int (*dsa_sign_setup) (DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
139                           BIGNUM **rp);
140    int (*dsa_do_verify) (const unsigned char *dgst, int dgst_len,
141                          DSA_SIG *sig, DSA *dsa);
142    int (*dsa_mod_exp) (DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
143                        BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
144                        BN_MONT_CTX *in_mont);
145    /* Can be null */
146    int (*bn_mod_exp) (DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
147                       const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
148    int (*init) (DSA *dsa);
149    int (*finish) (DSA *dsa);
150    int flags;
151    char *app_data;
152    /* If this is non-NULL, it is used to generate DSA parameters */
153    int (*dsa_paramgen) (DSA *dsa, int bits,
154                         unsigned char *seed, int seed_len,
155                         int *counter_ret, unsigned long *h_ret,
156                         BN_GENCB *cb);
157    /* If this is non-NULL, it is used to generate DSA keys */
158    int (*dsa_keygen) (DSA *dsa);
159};
160
161struct dsa_st {
162    /*
163     * This first variable is used to pick up errors where a DSA is passed
164     * instead of of a EVP_PKEY
165     */
166    int pad;
167    long version;
168    int write_params;
169    BIGNUM *p;
170    BIGNUM *q;                  /* == 20 */
171    BIGNUM *g;
172    BIGNUM *pub_key;            /* y public key */
173    BIGNUM *priv_key;           /* x private key */
174    BIGNUM *kinv;               /* Signing pre-calc */
175    BIGNUM *r;                  /* Signing pre-calc */
176    int flags;
177    /* Normally used to cache montgomery values */
178    BN_MONT_CTX *method_mont_p;
179    int references;
180    CRYPTO_EX_DATA ex_data;
181    const DSA_METHOD *meth;
182    /* functional reference if 'meth' is ENGINE-provided */
183    ENGINE *engine;
184};
185
186# define DSAparams_dup(x) ASN1_dup_of_const(DSA,i2d_DSAparams,d2i_DSAparams,x)
187# define d2i_DSAparams_fp(fp,x) (DSA *)ASN1_d2i_fp((char *(*)())DSA_new, \
188                (char *(*)())d2i_DSAparams,(fp),(unsigned char **)(x))
189# define i2d_DSAparams_fp(fp,x) ASN1_i2d_fp(i2d_DSAparams,(fp), \
190                (unsigned char *)(x))
191# define d2i_DSAparams_bio(bp,x) ASN1_d2i_bio_of(DSA,DSA_new,d2i_DSAparams,bp,x)
192# define i2d_DSAparams_bio(bp,x) ASN1_i2d_bio_of_const(DSA,i2d_DSAparams,bp,x)
193
194DSA_SIG *DSA_SIG_new(void);
195void DSA_SIG_free(DSA_SIG *a);
196int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
197DSA_SIG *d2i_DSA_SIG(DSA_SIG **v, const unsigned char **pp, long length);
198
199DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
200int DSA_do_verify(const unsigned char *dgst, int dgst_len,
201                  DSA_SIG *sig, DSA *dsa);
202
203const DSA_METHOD *DSA_OpenSSL(void);
204
205void DSA_set_default_method(const DSA_METHOD *);
206const DSA_METHOD *DSA_get_default_method(void);
207int DSA_set_method(DSA *dsa, const DSA_METHOD *);
208
209# ifdef OPENSSL_FIPS
210DSA *FIPS_dsa_new(void);
211void FIPS_dsa_free(DSA *r);
212# endif
213
214DSA *DSA_new(void);
215DSA *DSA_new_method(ENGINE *engine);
216void DSA_free(DSA *r);
217/* "up" the DSA object's reference count */
218int DSA_up_ref(DSA *r);
219int DSA_size(const DSA *);
220        /* next 4 return -1 on error */
221int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp);
222int DSA_sign(int type, const unsigned char *dgst, int dlen,
223             unsigned char *sig, unsigned int *siglen, DSA *dsa);
224int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
225               const unsigned char *sigbuf, int siglen, DSA *dsa);
226int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
227                         CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
228int DSA_set_ex_data(DSA *d, int idx, void *arg);
229void *DSA_get_ex_data(DSA *d, int idx);
230
231DSA *d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length);
232DSA *d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length);
233DSA *d2i_DSAparams(DSA **a, const unsigned char **pp, long length);
234
235/* Deprecated version */
236# ifndef OPENSSL_NO_DEPRECATED
237DSA *DSA_generate_parameters(int bits,
238                             unsigned char *seed, int seed_len,
239                             int *counter_ret, unsigned long *h_ret, void
240                              (*callback) (int, int, void *), void *cb_arg);
241# endif                         /* !defined(OPENSSL_NO_DEPRECATED) */
242
243/* New version */
244int DSA_generate_parameters_ex(DSA *dsa, int bits,
245                               unsigned char *seed, int seed_len,
246                               int *counter_ret, unsigned long *h_ret,
247                               BN_GENCB *cb);
248
249int DSA_generate_key(DSA *a);
250int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
251int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
252int i2d_DSAparams(const DSA *a, unsigned char **pp);
253
254# ifndef OPENSSL_NO_BIO
255int DSAparams_print(BIO *bp, const DSA *x);
256int DSA_print(BIO *bp, const DSA *x, int off);
257# endif
258# ifndef OPENSSL_NO_FP_API
259int DSAparams_print_fp(FILE *fp, const DSA *x);
260int DSA_print_fp(FILE *bp, const DSA *x, int off);
261# endif
262
263# define DSS_prime_checks 50
264/*
265 * Primality test according to FIPS PUB 186[-1], Appendix 2.1: 50 rounds of
266 * Rabin-Miller
267 */
268# define DSA_is_prime(n, callback, cb_arg) \
269        BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg)
270
271# ifndef OPENSSL_NO_DH
272/*
273 * Convert DSA structure (key or just parameters) into DH structure (be
274 * careful to avoid small subgroup attacks when using this!)
275 */
276DH *DSA_dup_DH(const DSA *r);
277# endif
278
279# ifdef OPENSSL_FIPS
280int FIPS_dsa_sig_encode(unsigned char *out, DSA_SIG *sig);
281int FIPS_dsa_sig_decode(DSA_SIG *sig, const unsigned char *in, int inlen);
282# endif
283
284/* BEGIN ERROR CODES */
285/*
286 * The following lines are auto generated by the script mkerr.pl. Any changes
287 * made after this point may be overwritten when the script is next run.
288 */
289void ERR_load_DSA_strings(void);
290
291/* Error codes for the DSA functions. */
292
293/* Function codes. */
294# define DSA_F_D2I_DSA_SIG                                110
295# define DSA_F_DSAPARAMS_PRINT                            100
296# define DSA_F_DSAPARAMS_PRINT_FP                         101
297# define DSA_F_DSA_BUILTIN_KEYGEN                         119
298# define DSA_F_DSA_BUILTIN_PARAMGEN                       118
299# define DSA_F_DSA_DO_SIGN                                112
300# define DSA_F_DSA_DO_VERIFY                              113
301# define DSA_F_DSA_GENERATE_PARAMETERS                    117
302# define DSA_F_DSA_NEW_METHOD                             103
303# define DSA_F_DSA_PRINT                                  104
304# define DSA_F_DSA_PRINT_FP                               105
305# define DSA_F_DSA_SET_DEFAULT_METHOD                     115
306# define DSA_F_DSA_SET_METHOD                             116
307# define DSA_F_DSA_SIGN                                   106
308# define DSA_F_DSA_SIGN_SETUP                             107
309# define DSA_F_DSA_SIG_NEW                                109
310# define DSA_F_DSA_VERIFY                                 108
311# define DSA_F_I2D_DSA_SIG                                111
312# define DSA_F_SIG_CB                                     114
313
314/* Reason codes. */
315# define DSA_R_BAD_Q_VALUE                                102
316# define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE                100
317# define DSA_R_KEY_SIZE_TOO_SMALL                         106
318# define DSA_R_MISSING_PARAMETERS                         101
319# define DSA_R_MODULUS_TOO_LARGE                          103
320# define DSA_R_NON_FIPS_METHOD                            104
321# define DSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE         105
322
323#ifdef  __cplusplus
324}
325#endif
326#endif
327