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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 OPENSSL_DH_MAX_MODULUS_BITS 10000
74
75#define DH_FLAG_CACHE_MONT_P 0x01
76#define DH_FLAG_NO_EXP_CONSTTIME 0x02 /* new with 0.9.7h; the built-in DH
77 * implementation now uses constant time
78 * modular exponentiation for secret exponents
79 * by default. This flag causes the
80 * faster variable sliding window method to
81 * be used for all exponents.
82 */
83
84#ifdef __cplusplus
85extern "C" {
86#endif
87
88typedef struct dh_st DH;
89
90typedef struct dh_method {
91 const char *name;
92 /* Methods here */
93 int (*generate_key)(DH *dh);
94 int (*compute_key)(unsigned char *key,const BIGNUM *pub_key,DH *dh);
95 int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a,
96 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
97 BN_MONT_CTX *m_ctx); /* Can be null */
98
99 int (*init)(DH *dh);
100 int (*finish)(DH *dh);
101 int flags;
102 char *app_data;
103} DH_METHOD;
104
105struct dh_st
106 {
107 /* This first argument is used to pick up errors when
108 * a DH is passed instead of a EVP_PKEY */
109 int pad;
110 int version;
111 BIGNUM *p;
112 BIGNUM *g;
113 int length; /* optional */
114 BIGNUM *pub_key; /* g^x */
115 BIGNUM *priv_key; /* x */
116
117 int flags;
118 char *method_mont_p;
119 /* Place holders if we want to do X9.42 DH */
120 BIGNUM *q;
121 BIGNUM *j;
122 unsigned char *seed;
123 int seedlen;
124 BIGNUM *counter;
125
126 int references;
127 CRYPTO_EX_DATA ex_data;
128 const DH_METHOD *meth;
129 ENGINE *engine;
130 };
131
132#define DH_GENERATOR_2 2
133/* #define DH_GENERATOR_3 3 */
134#define DH_GENERATOR_5 5
135
136/* DH_check error codes */
137#define DH_CHECK_P_NOT_PRIME 0x01
138#define DH_CHECK_P_NOT_SAFE_PRIME 0x02
139#define DH_UNABLE_TO_CHECK_GENERATOR 0x04
140#define DH_NOT_SUITABLE_GENERATOR 0x08
141
142/* DH_check_pub_key error codes */
143#define DH_CHECK_PUBKEY_TOO_SMALL 0x01
144#define DH_CHECK_PUBKEY_TOO_LARGE 0x02
145
146/* primes p where (p-1)/2 is prime too are called "safe"; we define
147 this for backward compatibility: */
148#define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME
149
150#define DHparams_dup(x) (DH *)ASN1_dup((int (*)())i2d_DHparams, \
151 (char *(*)())d2i_DHparams,(char *)(x))
152#define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
153 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
154#define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
155 (unsigned char *)(x))
156#define d2i_DHparams_bio(bp,x) (DH *)ASN1_d2i_bio((char *(*)())DH_new, \
157 (char *(*)())d2i_DHparams,(bp),(unsigned char **)(x))
158#ifdef __cplusplus
159#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio((int (*)())i2d_DHparams,(bp), \
160 (unsigned char *)(x))
161#else
162#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio(i2d_DHparams,(bp), \
163 (unsigned char *)(x))
164#endif
165
166const DH_METHOD *DH_OpenSSL(void);
167
168void DH_set_default_method(const DH_METHOD *meth);
169const DH_METHOD *DH_get_default_method(void);
170int DH_set_method(DH *dh, const DH_METHOD *meth);
171DH *DH_new_method(ENGINE *engine);
172
173DH * DH_new(void);
174void DH_free(DH *dh);
175int DH_up_ref(DH *dh);
176int DH_size(const DH *dh);
177int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
178 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
179int DH_set_ex_data(DH *d, int idx, void *arg);
180void *DH_get_ex_data(DH *d, int idx);
181DH * DH_generate_parameters(int prime_len,int generator,
182 void (*callback)(int,int,void *),void *cb_arg);
183int DH_check(const DH *dh,int *codes);
184int DH_check_pub_key(const DH *dh,const BIGNUM *pub_key, int *codes);
185int DH_generate_key(DH *dh);
186int DH_compute_key(unsigned char *key,const BIGNUM *pub_key,DH *dh);
187DH * d2i_DHparams(DH **a,const unsigned char **pp, long length);
188int i2d_DHparams(const DH *a,unsigned char **pp);
189#ifndef OPENSSL_NO_FP_API
190int DHparams_print_fp(FILE *fp, const DH *x);
191#endif
192#ifndef OPENSSL_NO_BIO
193int DHparams_print(BIO *bp, const DH *x);
194#else
195int DHparams_print(char *bp, const DH *x);
196#endif
197
198/* BEGIN ERROR CODES */
199/* The following lines are auto generated by the script mkerr.pl. Any changes
200 * made after this point may be overwritten when the script is next run.
201 */
202void ERR_load_DH_strings(void);
203
204/* Error codes for the DH functions. */
205
206/* Function codes. */
207#define DH_F_DHPARAMS_PRINT 100
208#define DH_F_DHPARAMS_PRINT_FP 101
209#define DH_F_DH_COMPUTE_KEY 102
210#define DH_F_DH_GENERATE_KEY 103
211#define DH_F_DH_GENERATE_PARAMETERS 104
212#define DH_F_DH_NEW_METHOD 105
213
214/* Reason codes. */
215#define DH_R_BAD_GENERATOR 101
216#define DH_R_NO_PRIVATE_VALUE 100
217#define DH_R_INVALID_PUBKEY 102
218#define DH_R_MODULUS_TOO_LARGE 103
219
220#ifdef __cplusplus
221}
222#endif
223#endif
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