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1/* crypto/dh/dh.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#ifndef HEADER_DH_H
60#define HEADER_DH_H
61
62#include <openssl/e_os2.h>
63
64#ifdef OPENSSL_NO_DH
65#error DH is disabled.
66#endif
67
68#ifndef OPENSSL_NO_BIO
69#include <openssl/bio.h>
70#endif
71#include <openssl/ossl_typ.h>
72#ifndef OPENSSL_NO_DEPRECATED
73#include <openssl/bn.h>
74#endif
75       
76#ifndef OPENSSL_DH_MAX_MODULUS_BITS
77# define OPENSSL_DH_MAX_MODULUS_BITS    10000
78#endif
79
80#define DH_FLAG_CACHE_MONT_P     0x01
81#define DH_FLAG_NO_EXP_CONSTTIME 0x02 /* new with 0.9.7h; the built-in DH
82                                       * implementation now uses constant time
83                                       * modular exponentiation for secret exponents
84                                       * by default. This flag causes the
85                                       * faster variable sliding window method to
86                                       * be used for all exponents.
87                                       */
88
89#ifdef  __cplusplus
90extern "C" {
91#endif
92
93/* Already defined in ossl_typ.h */
94/* typedef struct dh_st DH; */
95/* typedef struct dh_method DH_METHOD; */
96
97struct dh_method
98        {
99        const char *name;
100        /* Methods here */
101        int (*generate_key)(DH *dh);
102        int (*compute_key)(unsigned char *key,const BIGNUM *pub_key,DH *dh);
103        int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a,
104                                const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
105                                BN_MONT_CTX *m_ctx); /* Can be null */
106
107        int (*init)(DH *dh);
108        int (*finish)(DH *dh);
109        int flags;
110        char *app_data;
111        /* If this is non-NULL, it will be used to generate parameters */
112        int (*generate_params)(DH *dh, int prime_len, int generator, BN_GENCB *cb);
113        };
114
115struct dh_st
116        {
117        /* This first argument is used to pick up errors when
118         * a DH is passed instead of a EVP_PKEY */
119        int pad;
120        int version;
121        BIGNUM *p;
122        BIGNUM *g;
123        long length; /* optional */
124        BIGNUM *pub_key;        /* g^x */
125        BIGNUM *priv_key;       /* x */
126
127        int flags;
128        BN_MONT_CTX *method_mont_p;
129        /* Place holders if we want to do X9.42 DH */
130        BIGNUM *q;
131        BIGNUM *j;
132        unsigned char *seed;
133        int seedlen;
134        BIGNUM *counter;
135
136        int references;
137        CRYPTO_EX_DATA ex_data;
138        const DH_METHOD *meth;
139        ENGINE *engine;
140        };
141
142#define DH_GENERATOR_2          2
143/* #define DH_GENERATOR_3       3 */
144#define DH_GENERATOR_5          5
145
146/* DH_check error codes */
147#define DH_CHECK_P_NOT_PRIME            0x01
148#define DH_CHECK_P_NOT_SAFE_PRIME       0x02
149#define DH_UNABLE_TO_CHECK_GENERATOR    0x04
150#define DH_NOT_SUITABLE_GENERATOR       0x08
151
152/* DH_check_pub_key error codes */
153#define DH_CHECK_PUBKEY_TOO_SMALL       0x01
154#define DH_CHECK_PUBKEY_TOO_LARGE       0x02
155
156/* primes p where (p-1)/2 is prime too are called "safe"; we define
157   this for backward compatibility: */
158#define DH_CHECK_P_NOT_STRONG_PRIME     DH_CHECK_P_NOT_SAFE_PRIME
159
160#define DHparams_dup(x) ASN1_dup_of_const(DH,i2d_DHparams,d2i_DHparams,x)
161#define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
162                (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
163#define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
164                (unsigned char *)(x))
165#define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x)
166#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)
167
168const DH_METHOD *DH_OpenSSL(void);
169
170void DH_set_default_method(const DH_METHOD *meth);
171const DH_METHOD *DH_get_default_method(void);
172int DH_set_method(DH *dh, const DH_METHOD *meth);
173DH *DH_new_method(ENGINE *engine);
174
175DH *    DH_new(void);
176void    DH_free(DH *dh);
177int     DH_up_ref(DH *dh);
178int     DH_size(const DH *dh);
179int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
180             CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
181int DH_set_ex_data(DH *d, int idx, void *arg);
182void *DH_get_ex_data(DH *d, int idx);
183
184/* Deprecated version */
185#ifndef OPENSSL_NO_DEPRECATED
186DH *    DH_generate_parameters(int prime_len,int generator,
187                void (*callback)(int,int,void *),void *cb_arg);
188#endif /* !defined(OPENSSL_NO_DEPRECATED) */
189
190/* New version */
191int     DH_generate_parameters_ex(DH *dh, int prime_len,int generator, BN_GENCB *cb);
192
193int     DH_check(const DH *dh,int *codes);
194int     DH_check_pub_key(const DH *dh,const BIGNUM *pub_key, int *codes);
195int     DH_generate_key(DH *dh);
196int     DH_compute_key(unsigned char *key,const BIGNUM *pub_key,DH *dh);
197DH *    d2i_DHparams(DH **a,const unsigned char **pp, long length);
198int     i2d_DHparams(const DH *a,unsigned char **pp);
199#ifndef OPENSSL_NO_FP_API
200int     DHparams_print_fp(FILE *fp, const DH *x);
201#endif
202#ifndef OPENSSL_NO_BIO
203int     DHparams_print(BIO *bp, const DH *x);
204#else
205int     DHparams_print(char *bp, const DH *x);
206#endif
207
208/* BEGIN ERROR CODES */
209/* The following lines are auto generated by the script mkerr.pl. Any changes
210 * made after this point may be overwritten when the script is next run.
211 */
212void ERR_load_DH_strings(void);
213
214/* Error codes for the DH functions. */
215
216/* Function codes. */
217#define DH_F_COMPUTE_KEY                                 102
218#define DH_F_DHPARAMS_PRINT                              100
219#define DH_F_DHPARAMS_PRINT_FP                           101
220#define DH_F_DH_BUILTIN_GENPARAMS                        106
221#define DH_F_DH_NEW_METHOD                               105
222#define DH_F_GENERATE_KEY                                103
223#define DH_F_GENERATE_PARAMETERS                         104
224
225/* Reason codes. */
226#define DH_R_BAD_GENERATOR                               101
227#define DH_R_INVALID_PUBKEY                              102
228#define DH_R_MODULUS_TOO_LARGE                           103
229#define DH_R_NO_PRIVATE_VALUE                            100
230
231#ifdef  __cplusplus
232}
233#endif
234#endif
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