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