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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 OPENSSL_DH_FIPS_MIN_MODULUS_BITS 1024
81
82#define DH_FLAG_CACHE_MONT_P 0x01
83#define DH_FLAG_NO_EXP_CONSTTIME 0x02 /* new with 0.9.7h; the built-in DH
84 * implementation now uses constant time
85 * modular exponentiation for secret exponents
86 * by default. This flag causes the
87 * faster variable sliding window method to
88 * be used for all exponents.
89 */
90
91#ifdef __cplusplus
92extern "C" {
93#endif
94
95/* Already defined in ossl_typ.h */
96/* typedef struct dh_st DH; */
97/* typedef struct dh_method DH_METHOD; */
98
99struct dh_method
100 {
101 const char *name;
102 /* Methods here */
103 int (*generate_key)(DH *dh);
104 int (*compute_key)(unsigned char *key,const BIGNUM *pub_key,DH *dh);
105 int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a,
106 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
107 BN_MONT_CTX *m_ctx); /* Can be null */
108
109 int (*init)(DH *dh);
110 int (*finish)(DH *dh);
111 int flags;
112 char *app_data;
113 /* If this is non-NULL, it will be used to generate parameters */
114 int (*generate_params)(DH *dh, int prime_len, int generator, BN_GENCB *cb);
115 };
116
117struct dh_st
118 {
119 /* This first argument is used to pick up errors when
120 * a DH is passed instead of a EVP_PKEY */
121 int pad;
122 int version;
123 BIGNUM *p;
124 BIGNUM *g;
125 long length; /* optional */
126 BIGNUM *pub_key; /* g^x */
127 BIGNUM *priv_key; /* x */
128
129 int flags;
130 BN_MONT_CTX *method_mont_p;
131 /* Place holders if we want to do X9.42 DH */
132 BIGNUM *q;
133 BIGNUM *j;
134 unsigned char *seed;
135 int seedlen;
136 BIGNUM *counter;
137
138 int references;
139 CRYPTO_EX_DATA ex_data;
140 const DH_METHOD *meth;
141 ENGINE *engine;
142 };
143
144#define DH_GENERATOR_2 2
145/* #define DH_GENERATOR_3 3 */
146#define DH_GENERATOR_5 5
147
148/* DH_check error codes */
149#define DH_CHECK_P_NOT_PRIME 0x01
150#define DH_CHECK_P_NOT_SAFE_PRIME 0x02
151#define DH_UNABLE_TO_CHECK_GENERATOR 0x04
152#define DH_NOT_SUITABLE_GENERATOR 0x08
153
154/* DH_check_pub_key error codes */
155#define DH_CHECK_PUBKEY_TOO_SMALL 0x01
156#define DH_CHECK_PUBKEY_TOO_LARGE 0x02
157
158/* primes p where (p-1)/2 is prime too are called "safe"; we define
159 this for backward compatibility: */
160#define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME
161
162#define DHparams_dup(x) ASN1_dup_of_const(DH,i2d_DHparams,d2i_DHparams,x)
163#define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
164 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
165#define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
166 (unsigned char *)(x))
167#define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x)
168#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)
169
170const DH_METHOD *DH_OpenSSL(void);
171
172#ifdef OPENSSL_FIPS
173DH * FIPS_dh_new(void);
174void FIPS_dh_free(DH *dh);
175#endif
176
177void DH_set_default_method(const DH_METHOD *meth);
178const DH_METHOD *DH_get_default_method(void);
179int DH_set_method(DH *dh, const DH_METHOD *meth);
180DH *DH_new_method(ENGINE *engine);
181
182DH * DH_new(void);
183void DH_free(DH *dh);
184int DH_up_ref(DH *dh);
185int DH_size(const DH *dh);
186int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
187 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
188int DH_set_ex_data(DH *d, int idx, void *arg);
189void *DH_get_ex_data(DH *d, int idx);
190
191/* Deprecated version */
192#ifndef OPENSSL_NO_DEPRECATED
193DH * DH_generate_parameters(int prime_len,int generator,
194 void (*callback)(int,int,void *),void *cb_arg);
195#endif /* !defined(OPENSSL_NO_DEPRECATED) */
196
197/* New version */
198int DH_generate_parameters_ex(DH *dh, int prime_len,int generator, BN_GENCB *cb);
199
200int DH_check(const DH *dh,int *codes);
201int DH_check_pub_key(const DH *dh,const BIGNUM *pub_key, int *codes);
202int DH_generate_key(DH *dh);
203int DH_compute_key(unsigned char *key,const BIGNUM *pub_key,DH *dh);
204DH * d2i_DHparams(DH **a,const unsigned char **pp, long length);
205int i2d_DHparams(const DH *a,unsigned char **pp);
206#ifndef OPENSSL_NO_FP_API
207int DHparams_print_fp(FILE *fp, const DH *x);
208#endif
209#ifndef OPENSSL_NO_BIO
210int DHparams_print(BIO *bp, const DH *x);
211#else
212int DHparams_print(char *bp, const DH *x);
213#endif
214
215/* BEGIN ERROR CODES */
216/* The following lines are auto generated by the script mkerr.pl. Any changes
217 * made after this point may be overwritten when the script is next run.
218 */
219void ERR_load_DH_strings(void);
220
221/* Error codes for the DH functions. */
222
223/* Function codes. */
224#define DH_F_COMPUTE_KEY 102
225#define DH_F_DHPARAMS_PRINT 100
226#define DH_F_DHPARAMS_PRINT_FP 101
227#define DH_F_DH_BUILTIN_GENPARAMS 106
228#define DH_F_DH_COMPUTE_KEY 107
229#define DH_F_DH_GENERATE_KEY 108
230#define DH_F_DH_GENERATE_PARAMETERS 109
231#define DH_F_DH_NEW_METHOD 105
232#define DH_F_GENERATE_KEY 103
233#define DH_F_GENERATE_PARAMETERS 104
234
235/* Reason codes. */
236#define DH_R_BAD_GENERATOR 101
237#define DH_R_INVALID_PUBKEY 102
238#define DH_R_KEY_SIZE_TOO_SMALL 104
239#define DH_R_MODULUS_TOO_LARGE 103
240#define DH_R_NO_PRIVATE_VALUE 100
241
242#ifdef __cplusplus
243}
244#endif
245#endif
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