mingw/include/openssl/dh.h

   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
  84 /*
  85  * new with 0.9.7h; the built-in DH
  86  * implementation now uses constant time
  87  * modular exponentiation for secret exponents
  88  * by default. This flag causes the
  89  * faster variable sliding window method to
  90  * be used for all exponents.
  91  */
  92 # define DH_FLAG_NO_EXP_CONSTTIME 0x02
  93
  94 #ifdef  __cplusplus
  95 extern "C" {
  96 #endif
  97
  98 /* Already defined in ossl_typ.h */
  99 /* typedef struct dh_st DH; */
 100 /* typedef struct dh_method DH_METHOD; */
 101
 102 struct dh_method {
 103     const char *name;
 104     /* Methods here */
 105     int (*generate_key) (DH *dh);
 106     int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh);
 107     /* Can be null */
 108     int (*bn_mod_exp) (const DH *dh, BIGNUM *r, const BIGNUM *a,
 109                        const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
 110                        BN_MONT_CTX *m_ctx);
 111     int (*init) (DH *dh);
 112     int (*finish) (DH *dh);
 113     int flags;
 114     char *app_data;
 115     /* If this is non-NULL, it will be used to generate parameters */
 116     int (*generate_params) (DH *dh, int prime_len, int generator,
 117                             BN_GENCB *cb);
 118 };
 119
 120 struct dh_st {
 121     /*
 122      * This first argument is used to pick up errors when a DH is passed
 123      * instead of a EVP_PKEY
 124      */
 125     int pad;
 126     int version;
 127     BIGNUM *p;
 128     BIGNUM *g;
 129     long length;                /* optional */
 130     BIGNUM *pub_key;            /* g^x */
 131     BIGNUM *priv_key;           /* x */
 132     int flags;
 133     BN_MONT_CTX *method_mont_p;
 134     /* Place holders if we want to do X9.42 DH */
 135     BIGNUM *q;
 136     BIGNUM *j;
 137     unsigned char *seed;
 138     int seedlen;
 139     BIGNUM *counter;
 140     int references;
 141     CRYPTO_EX_DATA ex_data;
 142     const DH_METHOD *meth;
 143     ENGINE *engine;
 144 };
 145
 146 # define DH_GENERATOR_2          2
 147 /* #define DH_GENERATOR_3       3 */
 148 # define DH_GENERATOR_5          5
 149
 150 /* DH_check error codes */
 151 # define DH_CHECK_P_NOT_PRIME            0x01
 152 # define DH_CHECK_P_NOT_SAFE_PRIME       0x02
 153 # define DH_UNABLE_TO_CHECK_GENERATOR    0x04
 154 # define DH_NOT_SUITABLE_GENERATOR       0x08
 155
 156 /* DH_check_pub_key error codes */
 157 # define DH_CHECK_PUBKEY_TOO_SMALL       0x01
 158 # define DH_CHECK_PUBKEY_TOO_LARGE       0x02
 159
 160 /*
 161  * primes p where (p-1)/2 is prime too are called "safe"; we define this for
 162  * backward compatibility:
 163  */
 164 # define DH_CHECK_P_NOT_STRONG_PRIME     DH_CHECK_P_NOT_SAFE_PRIME
 165
 166 # define DHparams_dup(x) ASN1_dup_of_const(DH,i2d_DHparams,d2i_DHparams,x)
 167 # define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
 168                 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
 169 # define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
 170                 (unsigned char *)(x))
 171 # define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x)
 172 # define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)
 173
 174 const DH_METHOD *DH_OpenSSL(void);
 175
 176 # ifdef OPENSSL_FIPS
 177 DH *FIPS_dh_new(void);
 178 void FIPS_dh_free(DH *dh);
 179 # endif
 180
 181 void DH_set_default_method(const DH_METHOD *meth);
 182 const DH_METHOD *DH_get_default_method(void);
 183 int DH_set_method(DH *dh, const DH_METHOD *meth);
 184 DH *DH_new_method(ENGINE *engine);
 185
 186 DH *DH_new(void);
 187 void DH_free(DH *dh);
 188 int DH_up_ref(DH *dh);
 189 int DH_size(const DH *dh);
 190 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 191                         CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
 192 int DH_set_ex_data(DH *d, int idx, void *arg);
 193 void *DH_get_ex_data(DH *d, int idx);
 194
 195 /* Deprecated version */
 196 # ifndef OPENSSL_NO_DEPRECATED
 197 DH *DH_generate_parameters(int prime_len, int generator,
 198                            void (*callback) (int, int, void *), void *cb_arg);
 199 # endif                         /* !defined(OPENSSL_NO_DEPRECATED) */
 200
 201 /* New version */
 202 int DH_generate_parameters_ex(DH *dh, int prime_len, int generator,
 203                               BN_GENCB *cb);
 204
 205 int DH_check(const DH *dh, int *codes);
 206 int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *codes);
 207 int DH_generate_key(DH *dh);
 208 int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh);
 209 DH *d2i_DHparams(DH **a, const unsigned char **pp, long length);
 210 int i2d_DHparams(const DH *a, unsigned char **pp);
 211 # ifndef OPENSSL_NO_FP_API
 212 int DHparams_print_fp(FILE *fp, const DH *x);
 213 # endif
 214 # ifndef OPENSSL_NO_BIO
 215 int DHparams_print(BIO *bp, const DH *x);
 216 # else
 217 int DHparams_print(char *bp, const DH *x);
 218 # endif
 219
 220 /* BEGIN ERROR CODES */
 221 /*
 222  * The following lines are auto generated by the script mkerr.pl. Any changes
 223  * made after this point may be overwritten when the script is next run.
 224  */
 225 void ERR_load_DH_strings(void);
 226
 227 /* Error codes for the DH functions. */
 228
 229 /* Function codes. */
 230 # define DH_F_COMPUTE_KEY                                 102
 231 # define DH_F_DHPARAMS_PRINT                              100
 232 # define DH_F_DHPARAMS_PRINT_FP                           101
 233 # define DH_F_DH_BUILTIN_GENPARAMS                        106
 234 # define DH_F_DH_COMPUTE_KEY                              107
 235 # define DH_F_DH_GENERATE_KEY                             108
 236 # define DH_F_DH_GENERATE_PARAMETERS                      109
 237 # define DH_F_DH_NEW_METHOD                               105
 238 # define DH_F_GENERATE_KEY                                103
 239 # define DH_F_GENERATE_PARAMETERS                         104
 240
 241 /* Reason codes. */
 242 # define DH_R_BAD_GENERATOR                               101
 243 # define DH_R_INVALID_PUBKEY                              102
 244 # define DH_R_KEY_SIZE_TOO_SMALL                          104
 245 # define DH_R_MODULUS_TOO_LARGE                           103
 246 # define DH_R_NO_PRIVATE_VALUE                            100
 247
 248 #ifdef  __cplusplus
 249 }
 250 #endif
 251 #endif