1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#ifndef OPENSSL_HEADER_DH_H
#define OPENSSL_HEADER_DH_H
#include <openssl/base.h>
#include <openssl/engine.h>
#include <openssl/ex_data.h>
#if defined(__cplusplus)
extern "C" {
#endif
/* DH contains functions for performing Diffie-Hellman key agreement in
* multiplicative groups. */
/* Allocation and destruction. */
/* DH_new returns a new, empty DH object or NULL on error. */
OPENSSL_EXPORT DH *DH_new(void);
/* DH_new_method acts the same as |DH_new| but takes an explicit |ENGINE|. */
OPENSSL_EXPORT DH *DH_new_method(const ENGINE *engine);
/* DH_free decrements the reference count of |dh| and frees it if the reference
* count drops to zero. */
OPENSSL_EXPORT void DH_free(DH *dh);
/* DH_up_ref increments the reference count of |dh|. */
OPENSSL_EXPORT int DH_up_ref(DH *dh);
/* Standard parameters.
*
* These functions return new DH objects with standard parameters configured
* that use the given ENGINE, which may be NULL. They return NULL on allocation
* failure. */
/* These parameters are taken from RFC 5114. */
OPENSSL_EXPORT DH *DH_get_1024_160(const ENGINE *engine);
OPENSSL_EXPORT DH *DH_get_2048_224(const ENGINE *engine);
OPENSSL_EXPORT DH *DH_get_2048_256(const ENGINE *engine);
/* Parameter generation. */
#define DH_GENERATOR_2 2
#define DH_GENERATOR_5 5
/* DH_generate_parameters_ex generates a suitable Diffie-Hellman group with a
* prime that is |prime_bits| long and stores it in |dh|. The generator of the
* group will be |generator|, which should be |DH_GENERATOR_2| unless there's a
* good reason to use a different value. The |cb| argument contains a callback
* function that will be called during the generation. See the documentation in
* |bn.h| about this. In addition to the callback invocations from |BN|, |cb|
* will also be called with |event| equal to three when the generation is
* complete. */
OPENSSL_EXPORT int DH_generate_parameters_ex(DH *dh, int prime_bits,
int generator, BN_GENCB *cb);
/* Diffie-Hellman operations. */
/* DH_generate_key generates a new, random, private key and stores it in
* |dh|. It returns one on success and zero on error. */
OPENSSL_EXPORT int DH_generate_key(DH *dh);
/* DH_compute_key calculates the shared key between |dh| and |peers_key| and
* writes it as a big-endian integer into |out|, which must have |DH_size|
* bytes of space. It returns the number of bytes written, or a negative number
* on error. */
OPENSSL_EXPORT int DH_compute_key(uint8_t *out, const BIGNUM *peers_key,
DH *dh);
/* Utility functions. */
/* DH_size returns the number of bytes in the DH group's prime. */
OPENSSL_EXPORT int DH_size(const DH *dh);
#define DH_CHECK_P_NOT_PRIME 0x01
#define DH_CHECK_P_NOT_SAFE_PRIME 0x02
#define DH_CHECK_UNABLE_TO_CHECK_GENERATOR 0x04
#define DH_CHECK_NOT_SUITABLE_GENERATOR 0x08
#define DH_CHECK_Q_NOT_PRIME 0x10
#define DH_CHECK_INVALID_Q_VALUE 0x20
#define DH_CHECK_INVALID_J_VALUE 0x40
/* DH_check checks the suitability of |dh| as a Diffie-Hellman group. and sets
* |DH_CHECK_*| flags in |*out_flags| if it finds any errors. It returns one if
* |*out_flags| was successfully set and zero on error.
*
* Note: these checks may be quite computationally expensive. */
OPENSSL_EXPORT int DH_check(const DH *dh, int *out_flags);
#define DH_CHECK_PUBKEY_TOO_SMALL 1
#define DH_CHECK_PUBKEY_TOO_LARGE 2
/* DH_check_pub_key checks the suitability of |pub_key| as a public key for the
* DH group in |dh| and sets |DH_CHECK_PUBKEY_*| flags in |*out_flags| if it
* finds any errors. It returns one if |*out_flags| was successfully set and
* zero on error. */
OPENSSL_EXPORT int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key,
int *out_flags);
/* DHparams_dup allocates a fresh |DH| and copies the parameters from |dh| into
* it. It returns the new |DH| or NULL on error. */
OPENSSL_EXPORT DH *DHparams_dup(const DH *dh);
/* ASN.1 functions. */
/* d2i_DHparams parses an ASN.1, DER encoded Diffie-Hellman parameters
* structure from |len| bytes at |*inp|. If |ret| is not NULL then, on exit, a
* pointer to the result is in |*ret|. If |*ret| is already non-NULL on entry
* then the result is written directly into |*ret|, otherwise a fresh |DH| is
* allocated. On successful exit, |*inp| is advanced past the DER structure. It
* returns the result or NULL on error. */
OPENSSL_EXPORT DH *d2i_DHparams(DH **ret, const unsigned char **inp, long len);
/* i2d_DHparams marshals |in| to an ASN.1, DER structure. If |outp| is not NULL
* then the result is written to |*outp| and |*outp| is advanced just past the
* output. It returns the number of bytes in the result, whether written or
* not, or a negative value on error. */
OPENSSL_EXPORT int i2d_DHparams(const DH *in, unsigned char **outp);
/* ex_data functions.
*
* These functions are wrappers. See |ex_data.h| for details. */
OPENSSL_EXPORT int DH_get_ex_new_index(long argl, void *argp,
CRYPTO_EX_new *new_func,
CRYPTO_EX_dup *dup_func,
CRYPTO_EX_free *free_func);
OPENSSL_EXPORT int DH_set_ex_data(DH *d, int idx, void *arg);
OPENSSL_EXPORT void *DH_get_ex_data(DH *d, int idx);
/* dh_method contains function pointers to override the implementation of DH.
* See |engine.h| for details. */
struct dh_method {
struct openssl_method_common_st common;
/* app_data is an opaque pointer for the method to use. */
void *app_data;
/* init is called just before the return of |DH_new_method|. It returns one
* on success or zero on error. */
int (*init)(DH *dh);
/* finish is called before |dh| is destructed. */
void (*finish)(DH *dh);
/* generate_parameters is called by |DH_generate_parameters_ex|. */
int (*generate_parameters)(DH *dh, int prime_bits, int generator,
BN_GENCB *cb);
/* generate_parameters is called by |DH_generate_key|. */
int (*generate_key)(DH *dh);
/* compute_key is called by |DH_compute_key|. */
int (*compute_key)(DH *dh, uint8_t *out, const BIGNUM *pub_key);
};
struct dh_st {
DH_METHOD *meth;
BIGNUM *p;
BIGNUM *g;
BIGNUM *pub_key; /* g^x */
BIGNUM *priv_key; /* x */
/* priv_length contains the length, in bits, of the private value. If zero,
* the private value will be the same length as |p|. */
unsigned priv_length;
BN_MONT_CTX *method_mont_p;
/* Place holders if we want to do X9.42 DH */
BIGNUM *q;
BIGNUM *j;
unsigned char *seed;
int seedlen;
BIGNUM *counter;
int flags;
int references;
CRYPTO_EX_DATA ex_data;
};
#if defined(__cplusplus)
} /* extern C */
#endif
#define DH_F_generate_parameters 100
#define DH_F_generate_key 101
#define DH_F_compute_key 102
#define DH_F_DH_new_method 103
#define DH_R_INVALID_PUBKEY 100
#define DH_R_BAD_GENERATOR 101
#define DH_R_MODULUS_TOO_LARGE 102
#define DH_R_NO_PRIVATE_VALUE 103
#endif /* OPENSSL_HEADER_DH_H */
|
