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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 DH_FLAG_CACHE_MONT_P 0x01
81#define DH_FLAG_NO_EXP_CONSTTIME 0x02 /* new with 0.9.7h; the built-in DH
82 * implementation now uses constant time
83 * modular exponentiation for secret exponents
84 * by default. This flag causes the
85 * faster variable sliding window method to
86 * be used for all exponents.
87 */
88
89/* If this flag is set the DH method is FIPS compliant and can be used
90 * in FIPS mode. This is set in the validated module method. If an
91 * application sets this flag in its own methods it is its reposibility
92 * to ensure the result is compliant.
93 */
94
95#define DH_FLAG_FIPS_METHOD 0x0400
96
97/* If this flag is set the operations normally disabled in FIPS mode are
98 * permitted it is then the applications responsibility to ensure that the
99 * usage is compliant.
100 */
101
102#define DH_FLAG_NON_FIPS_ALLOW 0x0400
103
104#ifdef __cplusplus
105extern "C" {
106#endif
107
108/* Already defined in ossl_typ.h */
109/* typedef struct dh_st DH; */
110/* typedef struct dh_method DH_METHOD; */
111
112struct dh_method
113 {
114 const char *name;
115 /* Methods here */
116 int (*generate_key)(DH *dh);
117 int (*compute_key)(unsigned char *key,const BIGNUM *pub_key,DH *dh);
118 int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a,
119 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
120 BN_MONT_CTX *m_ctx); /* Can be null */
121
122 int (*init)(DH *dh);
123 int (*finish)(DH *dh);
124 int flags;
125 char *app_data;
126 /* If this is non-NULL, it will be used to generate parameters */
127 int (*generate_params)(DH *dh, int prime_len, int generator, BN_GENCB *cb);
128 };
129
130struct dh_st
131 {
132 /* This first argument is used to pick up errors when
133 * a DH is passed instead of a EVP_PKEY */
134 int pad;
135 int version;
136 BIGNUM *p;
137 BIGNUM *g;
138 long length; /* optional */
139 BIGNUM *pub_key; /* g^x */
140 BIGNUM *priv_key; /* x */
141
142 int flags;
143 BN_MONT_CTX *method_mont_p;
144 /* Place holders if we want to do X9.42 DH */
145 BIGNUM *q;
146 BIGNUM *j;
147 unsigned char *seed;
148 int seedlen;
149 BIGNUM *counter;
150
151 int references;
152 CRYPTO_EX_DATA ex_data;
153 const DH_METHOD *meth;
154 ENGINE *engine;
155 };
156
157#define DH_GENERATOR_2 2
158/* #define DH_GENERATOR_3 3 */
159#define DH_GENERATOR_5 5
160
161/* DH_check error codes */
162#define DH_CHECK_P_NOT_PRIME 0x01
163#define DH_CHECK_P_NOT_SAFE_PRIME 0x02
164#define DH_UNABLE_TO_CHECK_GENERATOR 0x04
165#define DH_NOT_SUITABLE_GENERATOR 0x08
166
167/* DH_check_pub_key error codes */
168#define DH_CHECK_PUBKEY_TOO_SMALL 0x01
169#define DH_CHECK_PUBKEY_TOO_LARGE 0x02
170
171/* primes p where (p-1)/2 is prime too are called "safe"; we define
172 this for backward compatibility: */
173#define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME
174
175#define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
176 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
177#define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
178 (unsigned char *)(x))
179#define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x)
180#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)
181
182DH *DHparams_dup(DH *);
183
184const DH_METHOD *DH_OpenSSL(void);
185
186void DH_set_default_method(const DH_METHOD *meth);
187const DH_METHOD *DH_get_default_method(void);
188int DH_set_method(DH *dh, const DH_METHOD *meth);
189DH *DH_new_method(ENGINE *engine);
190
191DH * DH_new(void);
192void DH_free(DH *dh);
193int DH_up_ref(DH *dh);
194int DH_size(const DH *dh);
195int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
196 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
197int DH_set_ex_data(DH *d, int idx, void *arg);
198void *DH_get_ex_data(DH *d, int idx);
199
200/* Deprecated version */
201#ifndef OPENSSL_NO_DEPRECATED
202DH * DH_generate_parameters(int prime_len,int generator,
203 void (*callback)(int,int,void *),void *cb_arg);
204#endif /* !defined(OPENSSL_NO_DEPRECATED) */
205
206/* New version */
207int DH_generate_parameters_ex(DH *dh, int prime_len,int generator, BN_GENCB *cb);
208
209int DH_check(const DH *dh,int *codes);
210int DH_check_pub_key(const DH *dh,const BIGNUM *pub_key, int *codes);
211int DH_generate_key(DH *dh);
212int DH_compute_key(unsigned char *key,const BIGNUM *pub_key,DH *dh);
213DH * d2i_DHparams(DH **a,const unsigned char **pp, long length);
214int i2d_DHparams(const DH *a,unsigned char **pp);
215#ifndef OPENSSL_NO_FP_API
216int DHparams_print_fp(FILE *fp, const DH *x);
217#endif
218#ifndef OPENSSL_NO_BIO
219int DHparams_print(BIO *bp, const DH *x);
220#else
221int DHparams_print(char *bp, const DH *x);
222#endif
223
224#define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \
225 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
226 EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL)
227
228#define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \
229 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
230 EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL)
231
232#define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN (EVP_PKEY_ALG_CTRL + 1)
233#define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR (EVP_PKEY_ALG_CTRL + 2)
234
235
236/* BEGIN ERROR CODES */
237/* The following lines are auto generated by the script mkerr.pl. Any changes
238 * made after this point may be overwritten when the script is next run.
239 */
240void ERR_load_DH_strings(void);
241
242/* Error codes for the DH functions. */
243
244/* Function codes. */
245#define DH_F_COMPUTE_KEY 102
246#define DH_F_DHPARAMS_PRINT_FP 101
247#define DH_F_DH_BUILTIN_GENPARAMS 106
248#define DH_F_DH_COMPUTE_KEY 114
249#define DH_F_DH_GENERATE_KEY 115
250#define DH_F_DH_GENERATE_PARAMETERS_EX 116
251#define DH_F_DH_NEW_METHOD 105
252#define DH_F_DH_PARAM_DECODE 107
253#define DH_F_DH_PRIV_DECODE 110
254#define DH_F_DH_PRIV_ENCODE 111
255#define DH_F_DH_PUB_DECODE 108
256#define DH_F_DH_PUB_ENCODE 109
257#define DH_F_DO_DH_PRINT 100
258#define DH_F_GENERATE_KEY 103
259#define DH_F_GENERATE_PARAMETERS 104
260#define DH_F_PKEY_DH_DERIVE 112
261#define DH_F_PKEY_DH_KEYGEN 113
262
263/* Reason codes. */
264#define DH_R_BAD_GENERATOR 101
265#define DH_R_BN_DECODE_ERROR 109
266#define DH_R_BN_ERROR 106
267#define DH_R_DECODE_ERROR 104
268#define DH_R_INVALID_PUBKEY 102
269#define DH_R_KEYS_NOT_SET 108
270#define DH_R_KEY_SIZE_TOO_SMALL 110
271#define DH_R_MODULUS_TOO_LARGE 103
272#define DH_R_NON_FIPS_METHOD 111
273#define DH_R_NO_PARAMETERS_SET 107
274#define DH_R_NO_PRIVATE_VALUE 100
275#define DH_R_PARAMETER_ENCODING_ERROR 105
276
277#ifdef __cplusplus
278}
279#endif
280#endif
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