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1/* $OpenBSD: dsa.h,v 1.21 2016/06/30 02:02:06 bcook Exp $ */
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/opensslconf.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 DSA_FLAG_CACHE_MONT_P 0x01
92
93/* If this flag is set the DSA method is FIPS compliant and can be used
94 * in FIPS mode. This is set in the validated module method. If an
95 * application sets this flag in its own methods it is its reposibility
96 * to ensure the result is compliant.
97 */
98
99#define DSA_FLAG_FIPS_METHOD 0x0400
100
101/* If this flag is set the operations normally disabled in FIPS mode are
102 * permitted it is then the applications responsibility to ensure that the
103 * usage is compliant.
104 */
105
106#define DSA_FLAG_NON_FIPS_ALLOW 0x0400
107
108#ifdef __cplusplus
109extern "C" {
110#endif
111
112/* Already defined in ossl_typ.h */
113/* typedef struct dsa_st DSA; */
114/* typedef struct dsa_method DSA_METHOD; */
115
116typedef struct DSA_SIG_st
117 {
118 BIGNUM *r;
119 BIGNUM *s;
120 } DSA_SIG;
121
122struct dsa_method
123 {
124 const char *name;
125 DSA_SIG * (*dsa_do_sign)(const unsigned char *dgst, int dlen, DSA *dsa);
126 int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
127 BIGNUM **rp);
128 int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
129 DSA_SIG *sig, DSA *dsa);
130 int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
131 BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
132 BN_MONT_CTX *in_mont);
133 int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
134 const BIGNUM *m, BN_CTX *ctx,
135 BN_MONT_CTX *m_ctx); /* Can be null */
136 int (*init)(DSA *dsa);
137 int (*finish)(DSA *dsa);
138 int flags;
139 char *app_data;
140 /* If this is non-NULL, it is used to generate DSA parameters */
141 int (*dsa_paramgen)(DSA *dsa, int bits,
142 const unsigned char *seed, int seed_len,
143 int *counter_ret, unsigned long *h_ret,
144 BN_GENCB *cb);
145 /* If this is non-NULL, it is used to generate DSA keys */
146 int (*dsa_keygen)(DSA *dsa);
147 };
148
149struct dsa_st
150 {
151 /* This first variable is used to pick up errors where
152 * a DSA is passed instead of of a EVP_PKEY */
153 int pad;
154 long version;
155 int write_params;
156 BIGNUM *p;
157 BIGNUM *q; /* == 20 */
158 BIGNUM *g;
159
160 BIGNUM *pub_key; /* y public key */
161 BIGNUM *priv_key; /* x private key */
162
163 BIGNUM *kinv; /* Signing pre-calc */
164 BIGNUM *r; /* Signing pre-calc */
165
166 int flags;
167 /* Normally used to cache montgomery values */
168 BN_MONT_CTX *method_mont_p;
169 int references;
170 CRYPTO_EX_DATA ex_data;
171 const DSA_METHOD *meth;
172 /* functional reference if 'meth' is ENGINE-provided */
173 ENGINE *engine;
174 };
175
176#define d2i_DSAparams_fp(fp,x) (DSA *)ASN1_d2i_fp((char *(*)())DSA_new, \
177 (char *(*)())d2i_DSAparams,(fp),(unsigned char **)(x))
178#define i2d_DSAparams_fp(fp,x) ASN1_i2d_fp(i2d_DSAparams,(fp), \
179 (unsigned char *)(x))
180#define d2i_DSAparams_bio(bp,x) ASN1_d2i_bio_of(DSA,DSA_new,d2i_DSAparams,bp,x)
181#define i2d_DSAparams_bio(bp,x) ASN1_i2d_bio_of_const(DSA,i2d_DSAparams,bp,x)
182
183
184DSA *DSAparams_dup(DSA *x);
185DSA_SIG * DSA_SIG_new(void);
186void DSA_SIG_free(DSA_SIG *a);
187int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
188DSA_SIG * d2i_DSA_SIG(DSA_SIG **v, const unsigned char **pp, long length);
189
190DSA_SIG * DSA_do_sign(const unsigned char *dgst,int dlen,DSA *dsa);
191int DSA_do_verify(const unsigned char *dgst,int dgst_len,
192 DSA_SIG *sig,DSA *dsa);
193
194const DSA_METHOD *DSA_OpenSSL(void);
195
196void DSA_set_default_method(const DSA_METHOD *);
197const DSA_METHOD *DSA_get_default_method(void);
198int DSA_set_method(DSA *dsa, const DSA_METHOD *);
199
200DSA * DSA_new(void);
201DSA * DSA_new_method(ENGINE *engine);
202void DSA_free(DSA *r);
203/* "up" the DSA object's reference count */
204int DSA_up_ref(DSA *r);
205int DSA_size(const DSA *);
206 /* next 4 return -1 on error */
207int DSA_sign_setup( DSA *dsa,BN_CTX *ctx_in,BIGNUM **kinvp,BIGNUM **rp);
208int DSA_sign(int type,const unsigned char *dgst,int dlen,
209 unsigned char *sig, unsigned int *siglen, DSA *dsa);
210int DSA_verify(int type,const unsigned char *dgst,int dgst_len,
211 const unsigned char *sigbuf, int siglen, DSA *dsa);
212int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
213 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
214int DSA_set_ex_data(DSA *d, int idx, void *arg);
215void *DSA_get_ex_data(DSA *d, int idx);
216
217DSA *d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length);
218int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
219extern const ASN1_ITEM DSAPublicKey_it;
220
221DSA *d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length);
222int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
223extern const ASN1_ITEM DSAPrivateKey_it;
224
225DSA *d2i_DSAparams(DSA **a, const unsigned char **pp, long length);
226int i2d_DSAparams(const DSA *a,unsigned char **pp);
227extern const ASN1_ITEM DSAparams_it;
228
229/* Deprecated version */
230#ifndef OPENSSL_NO_DEPRECATED
231DSA * DSA_generate_parameters(int bits,
232 unsigned char *seed,int seed_len,
233 int *counter_ret, unsigned long *h_ret,void
234 (*callback)(int, int, void *),void *cb_arg);
235#endif /* !defined(OPENSSL_NO_DEPRECATED) */
236
237/* New version */
238int DSA_generate_parameters_ex(DSA *dsa, int bits,
239 const unsigned char *seed,int seed_len,
240 int *counter_ret, unsigned long *h_ret, BN_GENCB *cb);
241
242int DSA_generate_key(DSA *a);
243
244#ifndef OPENSSL_NO_BIO
245int DSAparams_print(BIO *bp, const DSA *x);
246int DSA_print(BIO *bp, const DSA *x, int off);
247#endif
248int DSAparams_print_fp(FILE *fp, const DSA *x);
249int DSA_print_fp(FILE *bp, const DSA *x, int off);
250
251#define DSS_prime_checks 50
252/* Primality test according to FIPS PUB 186[-1], Appendix 2.1:
253 * 50 rounds of Rabin-Miller */
254#define DSA_is_prime(n, callback, cb_arg) \
255 BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg)
256
257#ifndef OPENSSL_NO_DH
258/* Convert DSA structure (key or just parameters) into DH structure
259 * (be careful to avoid small subgroup attacks when using this!) */
260DH *DSA_dup_DH(const DSA *r);
261#endif
262
263#define EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits) \
264 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN, \
265 EVP_PKEY_CTRL_DSA_PARAMGEN_BITS, nbits, NULL)
266
267#define EVP_PKEY_CTRL_DSA_PARAMGEN_BITS (EVP_PKEY_ALG_CTRL + 1)
268#define EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS (EVP_PKEY_ALG_CTRL + 2)
269#define EVP_PKEY_CTRL_DSA_PARAMGEN_MD (EVP_PKEY_ALG_CTRL + 3)
270
271/* BEGIN ERROR CODES */
272/* The following lines are auto generated by the script mkerr.pl. Any changes
273 * made after this point may be overwritten when the script is next run.
274 */
275void ERR_load_DSA_strings(void);
276
277/* Error codes for the DSA functions. */
278
279/* Function codes. */
280#define DSA_F_D2I_DSA_SIG 110
281#define DSA_F_DO_DSA_PRINT 104
282#define DSA_F_DSAPARAMS_PRINT 100
283#define DSA_F_DSAPARAMS_PRINT_FP 101
284#define DSA_F_DSA_DO_SIGN 112
285#define DSA_F_DSA_DO_VERIFY 113
286#define DSA_F_DSA_GENERATE_KEY 124
287#define DSA_F_DSA_GENERATE_PARAMETERS_EX 123
288#define DSA_F_DSA_NEW_METHOD 103
289#define DSA_F_DSA_PARAM_DECODE 119
290#define DSA_F_DSA_PRINT_FP 105
291#define DSA_F_DSA_PRIV_DECODE 115
292#define DSA_F_DSA_PRIV_ENCODE 116
293#define DSA_F_DSA_PUB_DECODE 117
294#define DSA_F_DSA_PUB_ENCODE 118
295#define DSA_F_DSA_SIGN 106
296#define DSA_F_DSA_SIGN_SETUP 107
297#define DSA_F_DSA_SIG_NEW 109
298#define DSA_F_DSA_SIG_PRINT 125
299#define DSA_F_DSA_VERIFY 108
300#define DSA_F_I2D_DSA_SIG 111
301#define DSA_F_OLD_DSA_PRIV_DECODE 122
302#define DSA_F_PKEY_DSA_CTRL 120
303#define DSA_F_PKEY_DSA_KEYGEN 121
304#define DSA_F_SIG_CB 114
305
306/* Reason codes. */
307#define DSA_R_BAD_Q_VALUE 102
308#define DSA_R_BN_DECODE_ERROR 108
309#define DSA_R_BN_ERROR 109
310#define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 100
311#define DSA_R_DECODE_ERROR 104
312#define DSA_R_INVALID_DIGEST_TYPE 106
313#define DSA_R_MISSING_PARAMETERS 101
314#define DSA_R_MODULUS_TOO_LARGE 103
315#define DSA_R_NEED_NEW_SETUP_VALUES 110
316#define DSA_R_NON_FIPS_DSA_METHOD 111
317#define DSA_R_NO_PARAMETERS_SET 107
318#define DSA_R_PARAMETER_ENCODING_ERROR 105
319
320#ifdef __cplusplus
321}
322#endif
323#endif
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