include/openssl/dh.h

   1 /*
   2  * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #ifndef OPENSSL_DH_H
  11 # define OPENSSL_DH_H
  12 # pragma once
  13
  14 # include <openssl/macros.h>
  15 # ifndef OPENSSL_NO_DEPRECATED_3_0
  16 #  define HEADER_DH_H
  17 # endif
  18
  19 # include <openssl/opensslconf.h>
  20 # include <openssl/types.h>
  21
  22 # ifdef  __cplusplus
  23 extern "C" {
  24 # endif
  25
  26 #include <stdlib.h>
  27
  28 /*
  29  * DH parameter generation types used by EVP_PKEY_CTX_set_dh_paramgen_type()
  30  * Note that additions/changes to this set of values requires corresponding
  31  * adjustments to range checks in dh_gen()
  32  */
  33 # define DH_PARAMGEN_TYPE_GENERATOR     0   /* Use a safe prime generator */
  34 # define DH_PARAMGEN_TYPE_FIPS_186_2    1   /* Use FIPS186-2 standard */
  35 # define DH_PARAMGEN_TYPE_FIPS_186_4    2   /* Use FIPS186-4 standard */
  36 # define DH_PARAMGEN_TYPE_GROUP         3   /* Use a named safe prime group */
  37
  38 int EVP_PKEY_CTX_set_dh_paramgen_type(EVP_PKEY_CTX *ctx, int typ);
  39 int EVP_PKEY_CTX_set_dh_paramgen_gindex(EVP_PKEY_CTX *ctx, int gindex);
  40 int EVP_PKEY_CTX_set_dh_paramgen_seed(EVP_PKEY_CTX *ctx,
  41                                       const unsigned char *seed,
  42                                       size_t seedlen);
  43 int EVP_PKEY_CTX_set_dh_paramgen_prime_len(EVP_PKEY_CTX *ctx, int pbits);
  44 int EVP_PKEY_CTX_set_dh_paramgen_subprime_len(EVP_PKEY_CTX *ctx, int qlen);
  45 int EVP_PKEY_CTX_set_dh_paramgen_generator(EVP_PKEY_CTX *ctx, int gen);
  46 int EVP_PKEY_CTX_set_dh_nid(EVP_PKEY_CTX *ctx, int nid);
  47 int EVP_PKEY_CTX_set_dh_rfc5114(EVP_PKEY_CTX *ctx, int gen);
  48 int EVP_PKEY_CTX_set_dhx_rfc5114(EVP_PKEY_CTX *ctx, int gen);
  49 int EVP_PKEY_CTX_set_dh_pad(EVP_PKEY_CTX *ctx, int pad);
  50
  51 int EVP_PKEY_CTX_set_dh_kdf_type(EVP_PKEY_CTX *ctx, int kdf);
  52 int EVP_PKEY_CTX_get_dh_kdf_type(EVP_PKEY_CTX *ctx);
  53 int EVP_PKEY_CTX_set0_dh_kdf_oid(EVP_PKEY_CTX *ctx, ASN1_OBJECT *oid);
  54 int EVP_PKEY_CTX_get0_dh_kdf_oid(EVP_PKEY_CTX *ctx, ASN1_OBJECT **oid);
  55 int EVP_PKEY_CTX_set_dh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
  56 int EVP_PKEY_CTX_get_dh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
  57 int EVP_PKEY_CTX_set_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int len);
  58 int EVP_PKEY_CTX_get_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int *len);
  59 int EVP_PKEY_CTX_set0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm, int len);
  60 # ifndef OPENSSL_NO_DEPRECATED_3_0
  61 OSSL_DEPRECATEDIN_3_0
  62 int EVP_PKEY_CTX_get0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **ukm);
  63 #endif
  64
  65 # define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN     (EVP_PKEY_ALG_CTRL + 1)
  66 # define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR     (EVP_PKEY_ALG_CTRL + 2)
  67 # define EVP_PKEY_CTRL_DH_RFC5114                (EVP_PKEY_ALG_CTRL + 3)
  68 # define EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN  (EVP_PKEY_ALG_CTRL + 4)
  69 # define EVP_PKEY_CTRL_DH_PARAMGEN_TYPE          (EVP_PKEY_ALG_CTRL + 5)
  70 # define EVP_PKEY_CTRL_DH_KDF_TYPE               (EVP_PKEY_ALG_CTRL + 6)
  71 # define EVP_PKEY_CTRL_DH_KDF_MD                 (EVP_PKEY_ALG_CTRL + 7)
  72 # define EVP_PKEY_CTRL_GET_DH_KDF_MD             (EVP_PKEY_ALG_CTRL + 8)
  73 # define EVP_PKEY_CTRL_DH_KDF_OUTLEN             (EVP_PKEY_ALG_CTRL + 9)
  74 # define EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN         (EVP_PKEY_ALG_CTRL + 10)
  75 # define EVP_PKEY_CTRL_DH_KDF_UKM                (EVP_PKEY_ALG_CTRL + 11)
  76 # define EVP_PKEY_CTRL_GET_DH_KDF_UKM            (EVP_PKEY_ALG_CTRL + 12)
  77 # define EVP_PKEY_CTRL_DH_KDF_OID                (EVP_PKEY_ALG_CTRL + 13)
  78 # define EVP_PKEY_CTRL_GET_DH_KDF_OID            (EVP_PKEY_ALG_CTRL + 14)
  79 # define EVP_PKEY_CTRL_DH_NID                    (EVP_PKEY_ALG_CTRL + 15)
  80 # define EVP_PKEY_CTRL_DH_PAD                    (EVP_PKEY_ALG_CTRL + 16)
  81
  82 /* KDF types */
  83 # define EVP_PKEY_DH_KDF_NONE                            1
  84 # define EVP_PKEY_DH_KDF_X9_42                           2
  85
  86 # ifndef OPENSSL_NO_STDIO
  87 #  include <stdio.h>
  88 # endif
  89 # ifndef OPENSSL_NO_DH
  90 #  include <openssl/e_os2.h>
  91 #  include <openssl/bio.h>
  92 #  include <openssl/asn1.h>
  93 #  ifndef OPENSSL_NO_DEPRECATED_1_1_0
  94 #   include <openssl/bn.h>
  95 #  endif
  96 #  include <openssl/dherr.h>
  97
  98 #  ifndef OPENSSL_DH_MAX_MODULUS_BITS
  99 #   define OPENSSL_DH_MAX_MODULUS_BITS        10000
 100 #  endif
 101
 102 #  ifndef OPENSSL_DH_CHECK_MAX_MODULUS_BITS
 103 #   define OPENSSL_DH_CHECK_MAX_MODULUS_BITS  32768
 104 #  endif
 105
 106 #  define OPENSSL_DH_FIPS_MIN_MODULUS_BITS 1024
 107
 108 #  define DH_FLAG_CACHE_MONT_P     0x01
 109
 110 #  define DH_FLAG_TYPE_MASK             0xF000
 111 #  define DH_FLAG_TYPE_DH               0x0000
 112 #  define DH_FLAG_TYPE_DHX              0x1000
 113
 114 #  ifndef OPENSSL_NO_DEPRECATED_1_1_0
 115 /*
 116  * Does nothing. Previously this switched off constant time behaviour.
 117  */
 118 #   define DH_FLAG_NO_EXP_CONSTTIME 0x00
 119 #  endif
 120
 121 #  ifndef OPENSSL_NO_DEPRECATED_3_0
 122 /*
 123  * If this flag is set the DH method is FIPS compliant and can be used in
 124  * FIPS mode. This is set in the validated module method. If an application
 125  * sets this flag in its own methods it is its responsibility to ensure the
 126  * result is compliant.
 127  */
 128
 129 #   define DH_FLAG_FIPS_METHOD                     0x0400
 130
 131 /*
 132  * If this flag is set the operations normally disabled in FIPS mode are
 133  * permitted it is then the applications responsibility to ensure that the
 134  * usage is compliant.
 135  */
 136
 137 #   define DH_FLAG_NON_FIPS_ALLOW                  0x0400
 138 #  endif
 139
 140 /* Already defined in ossl_typ.h */
 141 /* typedef struct dh_st DH; */
 142 /* typedef struct dh_method DH_METHOD; */
 143
 144 DECLARE_ASN1_ITEM(DHparams)
 145
 146 #  ifndef OPENSSL_NO_DEPRECATED_3_0
 147 #   define DH_GENERATOR_2          2
 148 #   define DH_GENERATOR_3          3
 149 #   define DH_GENERATOR_5          5
 150
 151 /* DH_check error codes, some of them shared with DH_check_pub_key */
 152 /*
 153  * NB: These values must align with the equivalently named macros in
 154  * internal/ffc.h.
 155  */
 156 #   define DH_CHECK_P_NOT_PRIME            0x01
 157 #   define DH_CHECK_P_NOT_SAFE_PRIME       0x02
 158 #   define DH_UNABLE_TO_CHECK_GENERATOR    0x04
 159 #   define DH_NOT_SUITABLE_GENERATOR       0x08
 160 #   define DH_CHECK_Q_NOT_PRIME            0x10
 161 #   define DH_CHECK_INVALID_Q_VALUE        0x20 /* +DH_check_pub_key */
 162 #   define DH_CHECK_INVALID_J_VALUE        0x40
 163 #   define DH_MODULUS_TOO_SMALL            0x80
 164 #   define DH_MODULUS_TOO_LARGE            0x100 /* +DH_check_pub_key */
 165
 166 /* DH_check_pub_key error codes */
 167 #   define DH_CHECK_PUBKEY_TOO_SMALL       0x01
 168 #   define DH_CHECK_PUBKEY_TOO_LARGE       0x02
 169 #   define DH_CHECK_PUBKEY_INVALID         0x04
 170
 171 /*
 172  * primes p where (p-1)/2 is prime too are called "safe"; we define this for
 173  * backward compatibility:
 174  */
 175 #   define DH_CHECK_P_NOT_STRONG_PRIME     DH_CHECK_P_NOT_SAFE_PRIME
 176
 177 #   define d2i_DHparams_fp(fp, x) \
 178         (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
 179                           (char *(*)())d2i_DHparams, \
 180                           (fp), \
 181                           (unsigned char **)(x))
 182 #   define i2d_DHparams_fp(fp, x) \
 183         ASN1_i2d_fp(i2d_DHparams,(fp), (unsigned char *)(x))
 184 #   define d2i_DHparams_bio(bp, x) \
 185         ASN1_d2i_bio_of(DH, DH_new, d2i_DHparams, bp, x)
 186 #   define i2d_DHparams_bio(bp, x) \
 187         ASN1_i2d_bio_of(DH, i2d_DHparams, bp, x)
 188
 189 #   define d2i_DHxparams_fp(fp,x) \
 190         (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
 191                           (char *(*)())d2i_DHxparams, \
 192                           (fp), \
 193                           (unsigned char **)(x))
 194 #   define i2d_DHxparams_fp(fp, x) \
 195         ASN1_i2d_fp(i2d_DHxparams,(fp), (unsigned char *)(x))
 196 #   define d2i_DHxparams_bio(bp, x) \
 197         ASN1_d2i_bio_of(DH, DH_new, d2i_DHxparams, bp, x)
 198 #   define i2d_DHxparams_bio(bp, x) \
 199         ASN1_i2d_bio_of(DH, i2d_DHxparams, bp, x)
 200
 201 DECLARE_ASN1_DUP_FUNCTION_name_attr(OSSL_DEPRECATEDIN_3_0, DH, DHparams)
 202
 203 OSSL_DEPRECATEDIN_3_0 const DH_METHOD *DH_OpenSSL(void);
 204
 205 OSSL_DEPRECATEDIN_3_0 void DH_set_default_method(const DH_METHOD *meth);
 206 OSSL_DEPRECATEDIN_3_0 const DH_METHOD *DH_get_default_method(void);
 207 OSSL_DEPRECATEDIN_3_0 int DH_set_method(DH *dh, const DH_METHOD *meth);
 208 OSSL_DEPRECATEDIN_3_0 DH *DH_new_method(ENGINE *engine);
 209
 210 OSSL_DEPRECATEDIN_3_0 DH *DH_new(void);
 211 OSSL_DEPRECATEDIN_3_0 void DH_free(DH *dh);
 212 OSSL_DEPRECATEDIN_3_0 int DH_up_ref(DH *dh);
 213 OSSL_DEPRECATEDIN_3_0 int DH_bits(const DH *dh);
 214 OSSL_DEPRECATEDIN_3_0 int DH_size(const DH *dh);
 215 OSSL_DEPRECATEDIN_3_0 int DH_security_bits(const DH *dh);
 216
 217 #   define DH_get_ex_new_index(l, p, newf, dupf, freef) \
 218         CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, l, p, newf, dupf, freef)
 219
 220 OSSL_DEPRECATEDIN_3_0 int DH_set_ex_data(DH *d, int idx, void *arg);
 221 OSSL_DEPRECATEDIN_3_0 void *DH_get_ex_data(const DH *d, int idx);
 222
 223 OSSL_DEPRECATEDIN_3_0 int DH_generate_parameters_ex(DH *dh, int prime_len,
 224                                                     int generator,
 225                                                     BN_GENCB *cb);
 226
 227 OSSL_DEPRECATEDIN_3_0 int DH_check_params_ex(const DH *dh);
 228 OSSL_DEPRECATEDIN_3_0 int DH_check_ex(const DH *dh);
 229 OSSL_DEPRECATEDIN_3_0 int DH_check_pub_key_ex(const DH *dh, const BIGNUM *pub_key);
 230 OSSL_DEPRECATEDIN_3_0 int DH_check_params(const DH *dh, int *ret);
 231 OSSL_DEPRECATEDIN_3_0 int DH_check(const DH *dh, int *codes);
 232 OSSL_DEPRECATEDIN_3_0 int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key,
 233                                            int *codes);
 234 OSSL_DEPRECATEDIN_3_0 int DH_generate_key(DH *dh);
 235 OSSL_DEPRECATEDIN_3_0 int DH_compute_key(unsigned char *key,
 236                                          const BIGNUM *pub_key, DH *dh);
 237 OSSL_DEPRECATEDIN_3_0 int DH_compute_key_padded(unsigned char *key,
 238                                                 const BIGNUM *pub_key, DH *dh);
 239
 240 DECLARE_ASN1_ENCODE_FUNCTIONS_only_attr(OSSL_DEPRECATEDIN_3_0, DH, DHparams)
 241 DECLARE_ASN1_ENCODE_FUNCTIONS_only_attr(OSSL_DEPRECATEDIN_3_0, DH, DHxparams)
 242
 243 #   ifndef OPENSSL_NO_STDIO
 244 OSSL_DEPRECATEDIN_3_0 int DHparams_print_fp(FILE *fp, const DH *x);
 245 #   endif
 246 OSSL_DEPRECATEDIN_3_0 int DHparams_print(BIO *bp, const DH *x);
 247
 248 /* RFC 5114 parameters */
 249 OSSL_DEPRECATEDIN_3_0 DH *DH_get_1024_160(void);
 250 OSSL_DEPRECATEDIN_3_0 DH *DH_get_2048_224(void);
 251 OSSL_DEPRECATEDIN_3_0 DH *DH_get_2048_256(void);
 252
 253 /* Named parameters, currently RFC7919 and RFC3526 */
 254 OSSL_DEPRECATEDIN_3_0 DH *DH_new_by_nid(int nid);
 255 OSSL_DEPRECATEDIN_3_0 int DH_get_nid(const DH *dh);
 256
 257 /* RFC2631 KDF */
 258 OSSL_DEPRECATEDIN_3_0 int DH_KDF_X9_42(unsigned char *out, size_t outlen,
 259                                        const unsigned char *Z, size_t Zlen,
 260                                        ASN1_OBJECT *key_oid,
 261                                        const unsigned char *ukm,
 262                                        size_t ukmlen, const EVP_MD *md);
 263
 264 OSSL_DEPRECATEDIN_3_0 void DH_get0_pqg(const DH *dh, const BIGNUM **p,
 265                                        const BIGNUM **q, const BIGNUM **g);
 266 OSSL_DEPRECATEDIN_3_0 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
 267 OSSL_DEPRECATEDIN_3_0 void DH_get0_key(const DH *dh, const BIGNUM **pub_key,
 268                                        const BIGNUM **priv_key);
 269 OSSL_DEPRECATEDIN_3_0 int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
 270 OSSL_DEPRECATEDIN_3_0 const BIGNUM *DH_get0_p(const DH *dh);
 271 OSSL_DEPRECATEDIN_3_0 const BIGNUM *DH_get0_q(const DH *dh);
 272 OSSL_DEPRECATEDIN_3_0 const BIGNUM *DH_get0_g(const DH *dh);
 273 OSSL_DEPRECATEDIN_3_0 const BIGNUM *DH_get0_priv_key(const DH *dh);
 274 OSSL_DEPRECATEDIN_3_0 const BIGNUM *DH_get0_pub_key(const DH *dh);
 275 OSSL_DEPRECATEDIN_3_0 void DH_clear_flags(DH *dh, int flags);
 276 OSSL_DEPRECATEDIN_3_0 int DH_test_flags(const DH *dh, int flags);
 277 OSSL_DEPRECATEDIN_3_0 void DH_set_flags(DH *dh, int flags);
 278 OSSL_DEPRECATEDIN_3_0 ENGINE *DH_get0_engine(DH *d);
 279 OSSL_DEPRECATEDIN_3_0 long DH_get_length(const DH *dh);
 280 OSSL_DEPRECATEDIN_3_0 int DH_set_length(DH *dh, long length);
 281
 282 OSSL_DEPRECATEDIN_3_0 DH_METHOD *DH_meth_new(const char *name, int flags);
 283 OSSL_DEPRECATEDIN_3_0 void DH_meth_free(DH_METHOD *dhm);
 284 OSSL_DEPRECATEDIN_3_0 DH_METHOD *DH_meth_dup(const DH_METHOD *dhm);
 285 OSSL_DEPRECATEDIN_3_0 const char *DH_meth_get0_name(const DH_METHOD *dhm);
 286 OSSL_DEPRECATEDIN_3_0 int DH_meth_set1_name(DH_METHOD *dhm, const char *name);
 287 OSSL_DEPRECATEDIN_3_0 int DH_meth_get_flags(const DH_METHOD *dhm);
 288 OSSL_DEPRECATEDIN_3_0 int DH_meth_set_flags(DH_METHOD *dhm, int flags);
 289 OSSL_DEPRECATEDIN_3_0 void *DH_meth_get0_app_data(const DH_METHOD *dhm);
 290 OSSL_DEPRECATEDIN_3_0 int DH_meth_set0_app_data(DH_METHOD *dhm, void *app_data);
 291 OSSL_DEPRECATEDIN_3_0 int (*DH_meth_get_generate_key(const DH_METHOD *dhm)) (DH *);
 292 OSSL_DEPRECATEDIN_3_0 int DH_meth_set_generate_key(DH_METHOD *dhm,
 293                                                    int (*generate_key) (DH *));
 294 OSSL_DEPRECATEDIN_3_0 int (*DH_meth_get_compute_key(const DH_METHOD *dhm))
 295                                                    (unsigned char *key,
 296                                                     const BIGNUM *pub_key,
 297                                                     DH *dh);
 298 OSSL_DEPRECATEDIN_3_0 int DH_meth_set_compute_key(DH_METHOD *dhm,
 299                                                   int (*compute_key)
 300                                                   (unsigned char *key,
 301                                                    const BIGNUM *pub_key,
 302                                                    DH *dh));
 303 OSSL_DEPRECATEDIN_3_0 int (*DH_meth_get_bn_mod_exp(const DH_METHOD *dhm))
 304                                                    (const DH *, BIGNUM *,
 305                                                     const BIGNUM *,
 306                                                     const BIGNUM *,
 307                                                     const BIGNUM *, BN_CTX *,
 308                                                     BN_MONT_CTX *);
 309 OSSL_DEPRECATEDIN_3_0 int DH_meth_set_bn_mod_exp(DH_METHOD *dhm,
 310                                                  int (*bn_mod_exp)
 311                                                  (const DH *, BIGNUM *,
 312                                                   const BIGNUM *, const BIGNUM *,
 313                                                   const BIGNUM *, BN_CTX *,
 314                                                   BN_MONT_CTX *));
 315 OSSL_DEPRECATEDIN_3_0 int (*DH_meth_get_init(const DH_METHOD *dhm))(DH *);
 316 OSSL_DEPRECATEDIN_3_0 int DH_meth_set_init(DH_METHOD *dhm, int (*init)(DH *));
 317 OSSL_DEPRECATEDIN_3_0 int (*DH_meth_get_finish(const DH_METHOD *dhm)) (DH *);
 318 OSSL_DEPRECATEDIN_3_0 int DH_meth_set_finish(DH_METHOD *dhm, int (*finish) (DH *));
 319 OSSL_DEPRECATEDIN_3_0 int (*DH_meth_get_generate_params(const DH_METHOD *dhm))
 320                                                         (DH *, int, int,
 321                                                          BN_GENCB *);
 322 OSSL_DEPRECATEDIN_3_0 int DH_meth_set_generate_params(DH_METHOD *dhm,
 323                                                       int (*generate_params)
 324                                                       (DH *, int, int,
 325                                                        BN_GENCB *));
 326 #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
 327
 328 #  ifndef OPENSSL_NO_DEPRECATED_0_9_8
 329 OSSL_DEPRECATEDIN_0_9_8 DH *DH_generate_parameters(int prime_len, int generator,
 330                                                    void (*callback) (int, int,
 331                                                                 void *),
 332                                                    void *cb_arg);
 333 #  endif
 334
 335 # endif
 336 # ifdef  __cplusplus
 337 }
 338 # endif
 339 #endif