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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#ifdef OPENSSL_NO_DH
63#error DH is disabled.
64#endif
65
66#ifndef OPENSSL_NO_BIO
67#include <openssl/bio.h>
68#endif
69#include <openssl/bn.h>
70#include <openssl/crypto.h>
71#include <openssl/ossl_typ.h>
72
73#define DH_FLAG_CACHE_MONT_P 0x01
74
75#ifdef __cplusplus
76extern "C" {
77#endif
78
79typedef struct dh_st DH;
80
81typedef struct dh_method {
82 const char *name;
83 /* Methods here */
84 int (*generate_key)(DH *dh);
85 int (*compute_key)(unsigned char *key,const BIGNUM *pub_key,DH *dh);
86 int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a,
87 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
88 BN_MONT_CTX *m_ctx); /* Can be null */
89
90 int (*init)(DH *dh);
91 int (*finish)(DH *dh);
92 int flags;
93 char *app_data;
94} DH_METHOD;
95
96struct dh_st
97 {
98 /* This first argument is used to pick up errors when
99 * a DH is passed instead of a EVP_PKEY */
100 int pad;
101 int version;
102 BIGNUM *p;
103 BIGNUM *g;
104 int length; /* optional */
105 BIGNUM *pub_key; /* g^x */
106 BIGNUM *priv_key; /* x */
107
108 int flags;
109 char *method_mont_p;
110 /* Place holders if we want to do X9.42 DH */
111 BIGNUM *q;
112 BIGNUM *j;
113 unsigned char *seed;
114 int seedlen;
115 BIGNUM *counter;
116
117 int references;
118 CRYPTO_EX_DATA ex_data;
119 const DH_METHOD *meth;
120 ENGINE *engine;
121 };
122
123#define DH_GENERATOR_2 2
124/* #define DH_GENERATOR_3 3 */
125#define DH_GENERATOR_5 5
126
127/* DH_check error codes */
128#define DH_CHECK_P_NOT_PRIME 0x01
129#define DH_CHECK_P_NOT_SAFE_PRIME 0x02
130#define DH_UNABLE_TO_CHECK_GENERATOR 0x04
131#define DH_NOT_SUITABLE_GENERATOR 0x08
132
133/* primes p where (p-1)/2 is prime too are called "safe"; we define
134 this for backward compatibility: */
135#define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME
136
137#define DHparams_dup(x) (DH *)ASN1_dup((int (*)())i2d_DHparams, \
138 (char *(*)())d2i_DHparams,(char *)(x))
139#define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
140 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
141#define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
142 (unsigned char *)(x))
143#define d2i_DHparams_bio(bp,x) (DH *)ASN1_d2i_bio((char *(*)())DH_new, \
144 (char *(*)())d2i_DHparams,(bp),(unsigned char **)(x))
145#ifdef __cplusplus
146#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio((int (*)())i2d_DHparams,(bp), \
147 (unsigned char *)(x))
148#else
149#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio(i2d_DHparams,(bp), \
150 (unsigned char *)(x))
151#endif
152
153const DH_METHOD *DH_OpenSSL(void);
154
155void DH_set_default_method(const DH_METHOD *meth);
156const DH_METHOD *DH_get_default_method(void);
157int DH_set_method(DH *dh, const DH_METHOD *meth);
158DH *DH_new_method(ENGINE *engine);
159
160DH * DH_new(void);
161void DH_free(DH *dh);
162int DH_up_ref(DH *dh);
163int DH_size(const DH *dh);
164int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
165 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
166int DH_set_ex_data(DH *d, int idx, void *arg);
167void *DH_get_ex_data(DH *d, int idx);
168DH * DH_generate_parameters(int prime_len,int generator,
169 void (*callback)(int,int,void *),void *cb_arg);
170int DH_check(const DH *dh,int *codes);
171int DH_generate_key(DH *dh);
172int DH_compute_key(unsigned char *key,const BIGNUM *pub_key,DH *dh);
173DH * d2i_DHparams(DH **a,const unsigned char **pp, long length);
174int i2d_DHparams(const DH *a,unsigned char **pp);
175#ifndef OPENSSL_NO_FP_API
176int DHparams_print_fp(FILE *fp, const DH *x);
177#endif
178#ifndef OPENSSL_NO_BIO
179int DHparams_print(BIO *bp, const DH *x);
180#else
181int DHparams_print(char *bp, const DH *x);
182#endif
183
184/* BEGIN ERROR CODES */
185/* The following lines are auto generated by the script mkerr.pl. Any changes
186 * made after this point may be overwritten when the script is next run.
187 */
188void ERR_load_DH_strings(void);
189
190/* Error codes for the DH functions. */
191
192/* Function codes. */
193#define DH_F_DHPARAMS_PRINT 100
194#define DH_F_DHPARAMS_PRINT_FP 101
195#define DH_F_DH_COMPUTE_KEY 102
196#define DH_F_DH_GENERATE_KEY 103
197#define DH_F_DH_GENERATE_PARAMETERS 104
198#define DH_F_DH_NEW_METHOD 105
199
200/* Reason codes. */
201#define DH_R_BAD_GENERATOR 101
202#define DH_R_NO_PRIVATE_VALUE 100
203
204#ifdef __cplusplus
205}
206#endif
207#endif
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