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1/* $OpenBSD: dh.h,v 1.17 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#ifndef HEADER_DH_H
60#define HEADER_DH_H
61
62#include <openssl/opensslconf.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
82/* If this flag is set the DH method is FIPS compliant and can be used
83 * in FIPS mode. This is set in the validated module method. If an
84 * application sets this flag in its own methods it is its reposibility
85 * to ensure the result is compliant.
86 */
87
88#define DH_FLAG_FIPS_METHOD 0x0400
89
90/* If this flag is set the operations normally disabled in FIPS mode are
91 * permitted it is then the applications responsibility to ensure that the
92 * usage is compliant.
93 */
94
95#define DH_FLAG_NON_FIPS_ALLOW 0x0400
96
97#ifdef __cplusplus
98extern "C" {
99#endif
100
101/* Already defined in ossl_typ.h */
102/* typedef struct dh_st DH; */
103/* typedef struct dh_method DH_METHOD; */
104
105struct dh_method
106 {
107 const char *name;
108 /* Methods here */
109 int (*generate_key)(DH *dh);
110 int (*compute_key)(unsigned char *key,const BIGNUM *pub_key,DH *dh);
111 int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a,
112 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
113 BN_MONT_CTX *m_ctx); /* Can be null */
114
115 int (*init)(DH *dh);
116 int (*finish)(DH *dh);
117 int flags;
118 char *app_data;
119 /* If this is non-NULL, it will be used to generate parameters */
120 int (*generate_params)(DH *dh, int prime_len, int generator, BN_GENCB *cb);
121 };
122
123struct dh_st
124 {
125 /* This first argument is used to pick up errors when
126 * a DH is passed instead of a EVP_PKEY */
127 int pad;
128 int version;
129 BIGNUM *p;
130 BIGNUM *g;
131 long length; /* optional */
132 BIGNUM *pub_key; /* g^x */
133 BIGNUM *priv_key; /* x */
134
135 int flags;
136 BN_MONT_CTX *method_mont_p;
137 /* Place holders if we want to do X9.42 DH */
138 BIGNUM *q;
139 BIGNUM *j;
140 unsigned char *seed;
141 int seedlen;
142 BIGNUM *counter;
143
144 int references;
145 CRYPTO_EX_DATA ex_data;
146 const DH_METHOD *meth;
147 ENGINE *engine;
148 };
149
150#define DH_GENERATOR_2 2
151/* #define DH_GENERATOR_3 3 */
152#define DH_GENERATOR_5 5
153
154/* DH_check error codes */
155#define DH_CHECK_P_NOT_PRIME 0x01
156#define DH_CHECK_P_NOT_SAFE_PRIME 0x02
157#define DH_UNABLE_TO_CHECK_GENERATOR 0x04
158#define DH_NOT_SUITABLE_GENERATOR 0x08
159
160/* DH_check_pub_key error codes */
161#define DH_CHECK_PUBKEY_TOO_SMALL 0x01
162#define DH_CHECK_PUBKEY_TOO_LARGE 0x02
163
164/* primes p where (p-1)/2 is prime too are called "safe"; we define
165 this for backward compatibility: */
166#define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME
167
168#define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
169 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
170#define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
171 (unsigned char *)(x))
172#define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x)
173#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)
174
175DH *DHparams_dup(DH *);
176
177const DH_METHOD *DH_OpenSSL(void);
178
179void DH_set_default_method(const DH_METHOD *meth);
180const DH_METHOD *DH_get_default_method(void);
181int DH_set_method(DH *dh, const DH_METHOD *meth);
182DH *DH_new_method(ENGINE *engine);
183
184DH * DH_new(void);
185void DH_free(DH *dh);
186int DH_up_ref(DH *dh);
187int DH_size(const DH *dh);
188int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
189 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
190int DH_set_ex_data(DH *d, int idx, void *arg);
191void *DH_get_ex_data(DH *d, int idx);
192
193/* Deprecated version */
194#ifndef OPENSSL_NO_DEPRECATED
195DH * DH_generate_parameters(int prime_len,int generator,
196 void (*callback)(int,int,void *),void *cb_arg);
197#endif /* !defined(OPENSSL_NO_DEPRECATED) */
198
199/* New version */
200int DH_generate_parameters_ex(DH *dh, int prime_len,int generator, BN_GENCB *cb);
201
202int DH_check(const DH *dh,int *codes);
203int DH_check_pub_key(const DH *dh,const BIGNUM *pub_key, int *codes);
204int DH_generate_key(DH *dh);
205int DH_compute_key(unsigned char *key,const BIGNUM *pub_key,DH *dh);
206DH * d2i_DHparams(DH **a,const unsigned char **pp, long length);
207int i2d_DHparams(const DH *a,unsigned char **pp);
208int DHparams_print_fp(FILE *fp, const DH *x);
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#define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \
216 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
217 EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL)
218
219#define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \
220 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
221 EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL)
222
223#define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN (EVP_PKEY_ALG_CTRL + 1)
224#define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR (EVP_PKEY_ALG_CTRL + 2)
225
226
227/* BEGIN ERROR CODES */
228/* The following lines are auto generated by the script mkerr.pl. Any changes
229 * made after this point may be overwritten when the script is next run.
230 */
231void ERR_load_DH_strings(void);
232
233/* Error codes for the DH functions. */
234
235/* Function codes. */
236#define DH_F_COMPUTE_KEY 102
237#define DH_F_DHPARAMS_PRINT_FP 101
238#define DH_F_DH_BUILTIN_GENPARAMS 106
239#define DH_F_DH_COMPUTE_KEY 114
240#define DH_F_DH_GENERATE_KEY 115
241#define DH_F_DH_GENERATE_PARAMETERS_EX 116
242#define DH_F_DH_NEW_METHOD 105
243#define DH_F_DH_PARAM_DECODE 107
244#define DH_F_DH_PRIV_DECODE 110
245#define DH_F_DH_PRIV_ENCODE 111
246#define DH_F_DH_PUB_DECODE 108
247#define DH_F_DH_PUB_ENCODE 109
248#define DH_F_DO_DH_PRINT 100
249#define DH_F_GENERATE_KEY 103
250#define DH_F_GENERATE_PARAMETERS 104
251#define DH_F_PKEY_DH_DERIVE 112
252#define DH_F_PKEY_DH_KEYGEN 113
253
254/* Reason codes. */
255#define DH_R_BAD_GENERATOR 101
256#define DH_R_BN_DECODE_ERROR 109
257#define DH_R_BN_ERROR 106
258#define DH_R_DECODE_ERROR 104
259#define DH_R_INVALID_PUBKEY 102
260#define DH_R_KEYS_NOT_SET 108
261#define DH_R_KEY_SIZE_TOO_SMALL 110
262#define DH_R_MODULUS_TOO_LARGE 103
263#define DH_R_NON_FIPS_METHOD 111
264#define DH_R_NO_PARAMETERS_SET 107
265#define DH_R_NO_PRIVATE_VALUE 100
266#define DH_R_PARAMETER_ENCODING_ERROR 105
267
268#ifdef __cplusplus
269}
270#endif
271#endif
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