include/openssl/dh.h

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #ifndef HEADER_DH_H
  59 # define HEADER_DH_H
  60
  61 # include <openssl/opensslconf.h>
  62
  63 # ifndef OPENSSL_NO_DH
  64 # include <openssl/e_os2.h>
  65 # include <openssl/bio.h>
  66 # include <openssl/asn1.h>
  67 # include <openssl/ossl_typ.h>
  68 # if OPENSSL_API_COMPAT < 0x10100000L
  69 #  include <openssl/bn.h>
  70 # endif
  71
  72 # ifdef  __cplusplus
  73 extern "C" {
  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 # define DH_FLAG_NO_EXP_CONSTTIME 0x02
  84
  85 /*
  86  * If this flag is set the DH method is FIPS compliant and can be used in
  87  * FIPS mode. This is set in the validated module method. If an application
  88  * sets this flag in its own methods it is its reposibility to ensure the
  89  * result is compliant.
  90  */
  91
  92 # define DH_FLAG_FIPS_METHOD                     0x0400
  93
  94 /*
  95  * If this flag is set the operations normally disabled in FIPS mode are
  96  * permitted it is then the applications responsibility to ensure that the
  97  * usage is compliant.
  98  */
  99
 100 # define DH_FLAG_NON_FIPS_ALLOW                  0x0400
 101
 102 /* Already defined in ossl_typ.h */
 103 /* typedef struct dh_st DH; */
 104 /* typedef struct dh_method DH_METHOD; */
 105
 106 struct dh_method {
 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     /* Can be null */
 112     int (*bn_mod_exp) (const DH *dh, BIGNUM *r, const BIGNUM *a,
 113                        const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
 114                        BN_MONT_CTX *m_ctx);
 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,
 121                             BN_GENCB *cb);
 122 };
 123
 124 DECLARE_ASN1_ITEM(DHparams)
 125
 126 # define DH_GENERATOR_2          2
 127 /* #define DH_GENERATOR_3       3 */
 128 # define DH_GENERATOR_5          5
 129
 130 /* DH_check error codes */
 131 # define DH_CHECK_P_NOT_PRIME            0x01
 132 # define DH_CHECK_P_NOT_SAFE_PRIME       0x02
 133 # define DH_UNABLE_TO_CHECK_GENERATOR    0x04
 134 # define DH_NOT_SUITABLE_GENERATOR       0x08
 135 # define DH_CHECK_Q_NOT_PRIME            0x10
 136 # define DH_CHECK_INVALID_Q_VALUE        0x20
 137 # define DH_CHECK_INVALID_J_VALUE        0x40
 138
 139 /* DH_check_pub_key error codes */
 140 # define DH_CHECK_PUBKEY_TOO_SMALL       0x01
 141 # define DH_CHECK_PUBKEY_TOO_LARGE       0x02
 142 # define DH_CHECK_PUBKEY_INVALID         0x04
 143
 144 /*
 145  * primes p where (p-1)/2 is prime too are called "safe"; we define this for
 146  * backward compatibility:
 147  */
 148 # define DH_CHECK_P_NOT_STRONG_PRIME     DH_CHECK_P_NOT_SAFE_PRIME
 149
 150 # define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
 151                 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
 152 # define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
 153                 (unsigned char *)(x))
 154 # define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x)
 155 # define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)
 156
 157 DH *DHparams_dup(DH *);
 158
 159 const DH_METHOD *DH_OpenSSL(void);
 160
 161 void DH_set_default_method(const DH_METHOD *meth);
 162 const DH_METHOD *DH_get_default_method(void);
 163 int DH_set_method(DH *dh, const DH_METHOD *meth);
 164 DH *DH_new_method(ENGINE *engine);
 165
 166 DH *DH_new(void);
 167 void DH_free(DH *dh);
 168 int DH_up_ref(DH *dh);
 169 int DH_bits(const DH *dh);
 170 int DH_size(const DH *dh);
 171 int DH_security_bits(const DH *dh);
 172 #define DH_get_ex_new_index(l, p, newf, dupf, freef) \
 173     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, l, p, newf, dupf, freef)
 174 int DH_set_ex_data(DH *d, int idx, void *arg);
 175 void *DH_get_ex_data(DH *d, int idx);
 176
 177 /* Deprecated version */
 178 DEPRECATEDIN_0_9_8(DH *DH_generate_parameters(int prime_len, int generator,
 179                                               void (*callback) (int, int,
 180                                                                 void *),
 181                                               void *cb_arg))
 182
 183 /* New version */
 184 int DH_generate_parameters_ex(DH *dh, int prime_len, int generator,
 185                               BN_GENCB *cb);
 186
 187 int DH_check(const DH *dh, int *codes);
 188 int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *codes);
 189 int DH_generate_key(DH *dh);
 190 int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh);
 191 int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
 192 DH *d2i_DHparams(DH **a, const unsigned char **pp, long length);
 193 int i2d_DHparams(const DH *a, unsigned char **pp);
 194 DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length);
 195 int i2d_DHxparams(const DH *a, unsigned char **pp);
 196 # ifndef OPENSSL_NO_STDIO
 197 int DHparams_print_fp(FILE *fp, const DH *x);
 198 # endif
 199 int DHparams_print(BIO *bp, const DH *x);
 200
 201 /* RFC 5114 parameters */
 202 DH *DH_get_1024_160(void);
 203 DH *DH_get_2048_224(void);
 204 DH *DH_get_2048_256(void);
 205
 206 # ifndef OPENSSL_NO_CMS
 207 /* RFC2631 KDF */
 208 int DH_KDF_X9_42(unsigned char *out, size_t outlen,
 209                  const unsigned char *Z, size_t Zlen,
 210                  ASN1_OBJECT *key_oid,
 211                  const unsigned char *ukm, size_t ukmlen, const EVP_MD *md);
 212 # endif
 213
 214 void DH_get0_pqg(const DH *dh, BIGNUM **p, BIGNUM **q, BIGNUM **g);
 215 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
 216 void DH_get0_key(const DH *dh, BIGNUM **pub_key, BIGNUM **priv_key);
 217 int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
 218 void DH_clear_flags(DH *dh, int flags);
 219 int DH_test_flags(const DH *dh, int flags);
 220 void DH_set_flags(DH *dh, int flags);
 221 ENGINE *DH_get0_engine(DH *d);
 222 long DH_get_length(const DH *dh);
 223 int DH_set_length(DH *dh, long length);
 224
 225
 226 # define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \
 227         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 228                         EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL)
 229
 230 # define EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len) \
 231         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 232                         EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN, len, NULL)
 233
 234 # define EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ) \
 235         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 236                         EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL)
 237
 238 # define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \
 239         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 240                         EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL)
 241
 242 # define EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen) \
 243         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
 244                         EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)
 245
 246 # define EVP_PKEY_CTX_set_dhx_rfc5114(ctx, gen) \
 247         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
 248                         EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)
 249
 250 # define EVP_PKEY_CTX_set_dh_kdf_type(ctx, kdf) \
 251         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 252                                 EVP_PKEY_OP_DERIVE, \
 253                                 EVP_PKEY_CTRL_DH_KDF_TYPE, kdf, NULL)
 254
 255 # define EVP_PKEY_CTX_get_dh_kdf_type(ctx) \
 256         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 257                                 EVP_PKEY_OP_DERIVE, \
 258                                 EVP_PKEY_CTRL_DH_KDF_TYPE, -2, NULL)
 259
 260 # define EVP_PKEY_CTX_set0_dh_kdf_oid(ctx, oid) \
 261         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 262                                 EVP_PKEY_OP_DERIVE, \
 263                                 EVP_PKEY_CTRL_DH_KDF_OID, 0, (void *)oid)
 264
 265 # define EVP_PKEY_CTX_get0_dh_kdf_oid(ctx, poid) \
 266         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 267                                 EVP_PKEY_OP_DERIVE, \
 268                                 EVP_PKEY_CTRL_GET_DH_KDF_OID, 0, (void *)poid)
 269
 270 # define EVP_PKEY_CTX_set_dh_kdf_md(ctx, md) \
 271         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 272                                 EVP_PKEY_OP_DERIVE, \
 273                                 EVP_PKEY_CTRL_DH_KDF_MD, 0, (void *)md)
 274
 275 # define EVP_PKEY_CTX_get_dh_kdf_md(ctx, pmd) \
 276         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 277                                 EVP_PKEY_OP_DERIVE, \
 278                                 EVP_PKEY_CTRL_GET_DH_KDF_MD, 0, (void *)pmd)
 279
 280 # define EVP_PKEY_CTX_set_dh_kdf_outlen(ctx, len) \
 281         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 282                                 EVP_PKEY_OP_DERIVE, \
 283                                 EVP_PKEY_CTRL_DH_KDF_OUTLEN, len, NULL)
 284
 285 # define EVP_PKEY_CTX_get_dh_kdf_outlen(ctx, plen) \
 286         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 287                                 EVP_PKEY_OP_DERIVE, \
 288                         EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN, 0, (void *)plen)
 289
 290 # define EVP_PKEY_CTX_set0_dh_kdf_ukm(ctx, p, plen) \
 291         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 292                                 EVP_PKEY_OP_DERIVE, \
 293                                 EVP_PKEY_CTRL_DH_KDF_UKM, plen, (void *)p)
 294
 295 # define EVP_PKEY_CTX_get0_dh_kdf_ukm(ctx, p) \
 296         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 297                                 EVP_PKEY_OP_DERIVE, \
 298                                 EVP_PKEY_CTRL_GET_DH_KDF_UKM, 0, (void *)p)
 299
 300 # define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN     (EVP_PKEY_ALG_CTRL + 1)
 301 # define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR     (EVP_PKEY_ALG_CTRL + 2)
 302 # define EVP_PKEY_CTRL_DH_RFC5114                (EVP_PKEY_ALG_CTRL + 3)
 303 # define EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN  (EVP_PKEY_ALG_CTRL + 4)
 304 # define EVP_PKEY_CTRL_DH_PARAMGEN_TYPE          (EVP_PKEY_ALG_CTRL + 5)
 305 # define EVP_PKEY_CTRL_DH_KDF_TYPE               (EVP_PKEY_ALG_CTRL + 6)
 306 # define EVP_PKEY_CTRL_DH_KDF_MD                 (EVP_PKEY_ALG_CTRL + 7)
 307 # define EVP_PKEY_CTRL_GET_DH_KDF_MD             (EVP_PKEY_ALG_CTRL + 8)
 308 # define EVP_PKEY_CTRL_DH_KDF_OUTLEN             (EVP_PKEY_ALG_CTRL + 9)
 309 # define EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN         (EVP_PKEY_ALG_CTRL + 10)
 310 # define EVP_PKEY_CTRL_DH_KDF_UKM                (EVP_PKEY_ALG_CTRL + 11)
 311 # define EVP_PKEY_CTRL_GET_DH_KDF_UKM            (EVP_PKEY_ALG_CTRL + 12)
 312 # define EVP_PKEY_CTRL_DH_KDF_OID                (EVP_PKEY_ALG_CTRL + 13)
 313 # define EVP_PKEY_CTRL_GET_DH_KDF_OID            (EVP_PKEY_ALG_CTRL + 14)
 314
 315 /* KDF types */
 316 # define EVP_PKEY_DH_KDF_NONE                            1
 317 # ifndef OPENSSL_NO_CMS
 318 # define EVP_PKEY_DH_KDF_X9_42                           2
 319 # endif
 320
 321 /* BEGIN ERROR CODES */
 322 /*
 323  * The following lines are auto generated by the script mkerr.pl. Any changes
 324  * made after this point may be overwritten when the script is next run.
 325  */
 326 void ERR_load_DH_strings(void);
 327
 328 /* Error codes for the DH functions. */
 329
 330 /* Function codes. */
 331 # define DH_F_COMPUTE_KEY                                 102
 332 # define DH_F_DHPARAMS_PRINT_FP                           101
 333 # define DH_F_DH_BUILTIN_GENPARAMS                        106
 334 # define DH_F_DH_CMS_DECRYPT                              114
 335 # define DH_F_DH_CMS_SET_PEERKEY                          115
 336 # define DH_F_DH_CMS_SET_SHARED_INFO                      116
 337 # define DH_F_DH_NEW_METHOD                               105
 338 # define DH_F_DH_PARAM_DECODE                             107
 339 # define DH_F_DH_PRIV_DECODE                              110
 340 # define DH_F_DH_PRIV_ENCODE                              111
 341 # define DH_F_DH_PUB_DECODE                               108
 342 # define DH_F_DH_PUB_ENCODE                               109
 343 # define DH_F_DO_DH_PRINT                                 100
 344 # define DH_F_GENERATE_KEY                                103
 345 # define DH_F_GENERATE_PARAMETERS                         104
 346 # define DH_F_PKEY_DH_DERIVE                              112
 347 # define DH_F_PKEY_DH_KEYGEN                              113
 348
 349 /* Reason codes. */
 350 # define DH_R_BAD_GENERATOR                               101
 351 # define DH_R_BN_DECODE_ERROR                             109
 352 # define DH_R_BN_ERROR                                    106
 353 # define DH_R_DECODE_ERROR                                104
 354 # define DH_R_INVALID_PUBKEY                              102
 355 # define DH_R_KDF_PARAMETER_ERROR                         112
 356 # define DH_R_KEYS_NOT_SET                                108
 357 # define DH_R_KEY_SIZE_TOO_SMALL                          110
 358 # define DH_R_MODULUS_TOO_LARGE                           103
 359 # define DH_R_NO_PARAMETERS_SET                           107
 360 # define DH_R_NO_PRIVATE_VALUE                            100
 361 # define DH_R_PARAMETER_ENCODING_ERROR                    105
 362 # define DH_R_PEER_KEY_ERROR                              111
 363 # define DH_R_SHARED_INFO_ERROR                           113
 364
 365 # ifdef  __cplusplus
 366 }
 367 # endif
 368 # endif
 369
 370 #endif