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1/* $OpenBSD: dh.h,v 1.38 2025/01/25 17:59:44 tb 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#ifndef OPENSSL_NO_BIO
65#include <openssl/bio.h>
66#endif
67#include <openssl/ossl_typ.h>
68#include <openssl/bn.h>
69
70#ifndef OPENSSL_DH_MAX_MODULUS_BITS
71# define OPENSSL_DH_MAX_MODULUS_BITS 10000
72#endif
73
74#define DH_FLAG_CACHE_MONT_P 0x01
75
76/* If this flag is set the DH method is FIPS compliant and can be used
77 * in FIPS mode. This is set in the validated module method. If an
78 * application sets this flag in its own methods it is its reposibility
79 * to ensure the result is compliant.
80 */
81
82#define DH_FLAG_FIPS_METHOD 0x0400
83
84/* If this flag is set the operations normally disabled in FIPS mode are
85 * permitted it is then the applications responsibility to ensure that the
86 * usage is compliant.
87 */
88
89#define DH_FLAG_NON_FIPS_ALLOW 0x0400
90
91#ifdef __cplusplus
92extern "C" {
93#endif
94
95#define DH_GENERATOR_2 2
96/* #define DH_GENERATOR_3 3 */
97#define DH_GENERATOR_5 5
98
99/* DH_check error codes */
100#define DH_CHECK_P_NOT_PRIME 0x01
101#define DH_CHECK_P_NOT_SAFE_PRIME 0x02
102#define DH_UNABLE_TO_CHECK_GENERATOR 0x04
103#define DH_NOT_SUITABLE_GENERATOR 0x08
104#define DH_CHECK_Q_NOT_PRIME 0x10
105#define DH_CHECK_INVALID_Q_VALUE 0x20
106#define DH_CHECK_INVALID_J_VALUE 0x40
107
108/* DH_check_pub_key error codes */
109#define DH_CHECK_PUBKEY_TOO_SMALL 0x01
110#define DH_CHECK_PUBKEY_TOO_LARGE 0x02
111#define DH_CHECK_PUBKEY_INVALID 0x04
112
113/* primes p where (p-1)/2 is prime too are called "safe"; we define
114 this for backward compatibility: */
115#define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME
116
117DH *d2i_DHparams_bio(BIO *bp, DH **a);
118int i2d_DHparams_bio(BIO *bp, DH *a);
119DH *d2i_DHparams_fp(FILE *fp, DH **a);
120int i2d_DHparams_fp(FILE *fp, DH *a);
121
122DH *DHparams_dup(DH *);
123
124const DH_METHOD *DH_OpenSSL(void);
125
126void DH_set_default_method(const DH_METHOD *meth);
127const DH_METHOD *DH_get_default_method(void);
128int DH_set_method(DH *dh, const DH_METHOD *meth);
129DH *DH_new_method(ENGINE *engine);
130
131DH * DH_new(void);
132void DH_free(DH *dh);
133int DH_up_ref(DH *dh);
134int DH_size(const DH *dh);
135int DH_bits(const DH *dh);
136int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
137 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
138int DH_set_ex_data(DH *d, int idx, void *arg);
139void *DH_get_ex_data(DH *d, int idx);
140int DH_security_bits(const DH *dh);
141
142ENGINE *DH_get0_engine(DH *d);
143void DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q,
144 const BIGNUM **g);
145int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
146void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key);
147int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
148const BIGNUM *DH_get0_p(const DH *dh);
149const BIGNUM *DH_get0_q(const DH *dh);
150const BIGNUM *DH_get0_g(const DH *dh);
151const BIGNUM *DH_get0_priv_key(const DH *dh);
152const BIGNUM *DH_get0_pub_key(const DH *dh);
153void DH_clear_flags(DH *dh, int flags);
154int DH_test_flags(const DH *dh, int flags);
155void DH_set_flags(DH *dh, int flags);
156long DH_get_length(const DH *dh);
157int DH_set_length(DH *dh, long length);
158
159/*
160 * Wrapped in OPENSSL_NO_DEPRECATED in 0.9.8, added to rust-openssl in 2020,
161 * for "advanced DH support".
162 */
163DH * DH_generate_parameters(int prime_len,int generator,
164 void (*callback)(int,int,void *),void *cb_arg);
165
166/* New version */
167int DH_generate_parameters_ex(DH *dh, int prime_len,int generator, BN_GENCB *cb);
168
169int DH_check(const DH *dh,int *codes);
170int DH_check_pub_key(const DH *dh,const BIGNUM *pub_key, 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);
175int DHparams_print_fp(FILE *fp, const DH *x);
176#ifndef OPENSSL_NO_BIO
177int DHparams_print(BIO *bp, const DH *x);
178#else
179int DHparams_print(char *bp, const DH *x);
180#endif
181
182#define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \
183 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
184 EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL)
185
186#define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \
187 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
188 EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL)
189
190#define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN (EVP_PKEY_ALG_CTRL + 1)
191#define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR (EVP_PKEY_ALG_CTRL + 2)
192
193
194void ERR_load_DH_strings(void);
195
196/* Error codes for the DH functions. */
197
198/* Function codes. */
199#define DH_F_COMPUTE_KEY 102
200#define DH_F_DHPARAMS_PRINT_FP 101
201#define DH_F_DH_BUILTIN_GENPARAMS 106
202#define DH_F_DH_COMPUTE_KEY 114
203#define DH_F_DH_GENERATE_KEY 115
204#define DH_F_DH_GENERATE_PARAMETERS_EX 116
205#define DH_F_DH_NEW_METHOD 105
206#define DH_F_DH_PARAM_DECODE 107
207#define DH_F_DH_PRIV_DECODE 110
208#define DH_F_DH_PRIV_ENCODE 111
209#define DH_F_DH_PUB_DECODE 108
210#define DH_F_DH_PUB_ENCODE 109
211#define DH_F_DO_DH_PRINT 100
212#define DH_F_GENERATE_KEY 103
213#define DH_F_GENERATE_PARAMETERS 104
214#define DH_F_PKEY_DH_DERIVE 112
215#define DH_F_PKEY_DH_KEYGEN 113
216
217/* Reason codes. */
218#define DH_R_BAD_GENERATOR 101
219#define DH_R_BN_DECODE_ERROR 109
220#define DH_R_BN_ERROR 106
221#define DH_R_DECODE_ERROR 104
222#define DH_R_INVALID_PUBKEY 102
223#define DH_R_KEYS_NOT_SET 108
224#define DH_R_KEY_SIZE_TOO_SMALL 110
225#define DH_R_MODULUS_TOO_LARGE 103
226#define DH_R_NON_FIPS_METHOD 111
227#define DH_R_NO_PARAMETERS_SET 107
228#define DH_R_NO_PRIVATE_VALUE 100
229#define DH_R_PARAMETER_ENCODING_ERROR 105
230#define DH_R_CHECK_INVALID_J_VALUE 115
231#define DH_R_CHECK_INVALID_Q_VALUE 116
232#define DH_R_CHECK_PUBKEY_INVALID 122
233#define DH_R_CHECK_PUBKEY_TOO_LARGE 123
234#define DH_R_CHECK_PUBKEY_TOO_SMALL 124
235#define DH_R_CHECK_P_NOT_PRIME 117
236#define DH_R_CHECK_P_NOT_SAFE_PRIME 118
237#define DH_R_CHECK_Q_NOT_PRIME 119
238#define DH_R_MISSING_PUBKEY 125
239#define DH_R_NOT_SUITABLE_GENERATOR 120
240#define DH_R_UNABLE_TO_CHECK_GENERATOR 121
241
242#ifdef __cplusplus
243}
244#endif
245#endif
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