include/openssl/dh.h

   1 /*
   2  * Copyright 1995-2019 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
  13 # include <openssl/opensslconf.h>
  14
  15 # ifndef OPENSSL_NO_DH
  16 # include <openssl/e_os2.h>
  17 # include <openssl/bio.h>
  18 # include <openssl/asn1.h>
  19 # include <openssl/types.h>
  20 # if !OPENSSL_API_1_1_0
  21 #  include <openssl/bn.h>
  22 # endif
  23 # include <openssl/dherr.h>
  24
  25 # ifdef  __cplusplus
  26 extern "C" {
  27 # endif
  28
  29 # ifndef OPENSSL_DH_MAX_MODULUS_BITS
  30 #  define OPENSSL_DH_MAX_MODULUS_BITS    10000
  31 # endif
  32
  33 # define OPENSSL_DH_FIPS_MIN_MODULUS_BITS 1024
  34
  35 # define DH_FLAG_CACHE_MONT_P     0x01
  36
  37 # if !OPENSSL_API_1_1_0
  38 /*
  39  * Does nothing. Previously this switched off constant time behaviour.
  40  */
  41 #  define DH_FLAG_NO_EXP_CONSTTIME 0x00
  42 # endif
  43
  44 /*
  45  * If this flag is set the DH method is FIPS compliant and can be used in
  46  * FIPS mode. This is set in the validated module method. If an application
  47  * sets this flag in its own methods it is its responsibility to ensure the
  48  * result is compliant.
  49  */
  50
  51 # define DH_FLAG_FIPS_METHOD                     0x0400
  52
  53 /*
  54  * If this flag is set the operations normally disabled in FIPS mode are
  55  * permitted it is then the applications responsibility to ensure that the
  56  * usage is compliant.
  57  */
  58
  59 # define DH_FLAG_NON_FIPS_ALLOW                  0x0400
  60
  61 /* Already defined in ossl_typ.h */
  62 /* typedef struct dh_st DH; */
  63 /* typedef struct dh_method DH_METHOD; */
  64
  65 DECLARE_ASN1_ITEM(DHparams)
  66
  67 # define DH_GENERATOR_2          2
  68 # define DH_GENERATOR_3          3
  69 # define DH_GENERATOR_5          5
  70
  71 /* DH_check error codes */
  72 # define DH_CHECK_P_NOT_PRIME            0x01
  73 # define DH_CHECK_P_NOT_SAFE_PRIME       0x02
  74 # define DH_UNABLE_TO_CHECK_GENERATOR    0x04
  75 # define DH_NOT_SUITABLE_GENERATOR       0x08
  76 # define DH_CHECK_Q_NOT_PRIME            0x10
  77 # define DH_CHECK_INVALID_Q_VALUE        0x20
  78 # define DH_CHECK_INVALID_J_VALUE        0x40
  79 # define DH_MODULUS_TOO_SMALL            0x80
  80 # define DH_MODULUS_TOO_LARGE            0x100
  81
  82 /* DH_check_pub_key error codes */
  83 # define DH_CHECK_PUBKEY_TOO_SMALL       0x01
  84 # define DH_CHECK_PUBKEY_TOO_LARGE       0x02
  85 # define DH_CHECK_PUBKEY_INVALID         0x04
  86
  87 /*
  88  * primes p where (p-1)/2 is prime too are called "safe"; we define this for
  89  * backward compatibility:
  90  */
  91 # define DH_CHECK_P_NOT_STRONG_PRIME     DH_CHECK_P_NOT_SAFE_PRIME
  92
  93 # define d2i_DHparams_fp(fp,x) \
  94     (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
  95                       (char *(*)())d2i_DHparams, \
  96                       (fp), \
  97                       (unsigned char **)(x))
  98 # define i2d_DHparams_fp(fp,x) \
  99     ASN1_i2d_fp(i2d_DHparams,(fp), (unsigned char *)(x))
 100 # define d2i_DHparams_bio(bp,x) \
 101     ASN1_d2i_bio_of(DH, DH_new, d2i_DHparams, bp, x)
 102 # define i2d_DHparams_bio(bp,x) \
 103     ASN1_i2d_bio_of(DH,i2d_DHparams,bp,x)
 104
 105 # define d2i_DHxparams_fp(fp,x) \
 106     (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
 107                       (char *(*)())d2i_DHxparams, \
 108                       (fp), \
 109                       (unsigned char **)(x))
 110 # define i2d_DHxparams_fp(fp,x) \
 111     ASN1_i2d_fp(i2d_DHxparams,(fp), (unsigned char *)(x))
 112 # define d2i_DHxparams_bio(bp,x) \
 113     ASN1_d2i_bio_of(DH, DH_new, d2i_DHxparams, bp, x)
 114 # define i2d_DHxparams_bio(bp,x) \
 115     ASN1_i2d_bio_of(DH, i2d_DHxparams, bp, x)
 116
 117 DECLARE_ASN1_DUP_FUNCTION_name(DH, DHparams)
 118
 119 const DH_METHOD *DH_OpenSSL(void);
 120
 121 void DH_set_default_method(const DH_METHOD *meth);
 122 const DH_METHOD *DH_get_default_method(void);
 123 int DH_set_method(DH *dh, const DH_METHOD *meth);
 124 DH *DH_new_method(ENGINE *engine);
 125
 126 DH *DH_new(void);
 127 void DH_free(DH *dh);
 128 int DH_up_ref(DH *dh);
 129 int DH_bits(const DH *dh);
 130 int DH_size(const DH *dh);
 131 int DH_security_bits(const DH *dh);
 132 #define DH_get_ex_new_index(l, p, newf, dupf, freef) \
 133     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, l, p, newf, dupf, freef)
 134 int DH_set_ex_data(DH *d, int idx, void *arg);
 135 void *DH_get_ex_data(DH *d, int idx);
 136
 137 /* Deprecated version */
 138 DEPRECATEDIN_0_9_8(DH *DH_generate_parameters(int prime_len, int generator,
 139                                               void (*callback) (int, int,
 140                                                                 void *),
 141                                               void *cb_arg))
 142
 143 /* New version */
 144 int DH_generate_parameters_ex(DH *dh, int prime_len, int generator,
 145                               BN_GENCB *cb);
 146
 147 int DH_check_params_ex(const DH *dh);
 148 int DH_check_ex(const DH *dh);
 149 int DH_check_pub_key_ex(const DH *dh, const BIGNUM *pub_key);
 150 int DH_check_params(const DH *dh, int *ret);
 151 int DH_check(const DH *dh, int *codes);
 152 int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *codes);
 153 int DH_generate_key(DH *dh);
 154 int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh);
 155 int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
 156 DECLARE_ASN1_ENCODE_FUNCTIONS_only(DH, DHparams)
 157 DECLARE_ASN1_ENCODE_FUNCTIONS_only(DH, DHxparams)
 158 # ifndef OPENSSL_NO_STDIO
 159 int DHparams_print_fp(FILE *fp, const DH *x);
 160 # endif
 161 int DHparams_print(BIO *bp, const DH *x);
 162
 163 /* RFC 5114 parameters */
 164 DH *DH_get_1024_160(void);
 165 DH *DH_get_2048_224(void);
 166 DH *DH_get_2048_256(void);
 167
 168 /* Named parameters, currently RFC7919 */
 169 DH *DH_new_by_nid(int nid);
 170 int DH_get_nid(const DH *dh);
 171
 172 # ifndef OPENSSL_NO_CMS
 173 /* RFC2631 KDF */
 174 int DH_KDF_X9_42(unsigned char *out, size_t outlen,
 175                  const unsigned char *Z, size_t Zlen,
 176                  ASN1_OBJECT *key_oid,
 177                  const unsigned char *ukm, size_t ukmlen, const EVP_MD *md);
 178 # endif
 179
 180 void DH_get0_pqg(const DH *dh,
 181                  const BIGNUM **p, const BIGNUM **q, const BIGNUM **g);
 182 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
 183 void DH_get0_key(const DH *dh,
 184                  const BIGNUM **pub_key, const BIGNUM **priv_key);
 185 int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
 186 const BIGNUM *DH_get0_p(const DH *dh);
 187 const BIGNUM *DH_get0_q(const DH *dh);
 188 const BIGNUM *DH_get0_g(const DH *dh);
 189 const BIGNUM *DH_get0_priv_key(const DH *dh);
 190 const BIGNUM *DH_get0_pub_key(const DH *dh);
 191 void DH_clear_flags(DH *dh, int flags);
 192 int DH_test_flags(const DH *dh, int flags);
 193 void DH_set_flags(DH *dh, int flags);
 194 ENGINE *DH_get0_engine(DH *d);
 195 long DH_get_length(const DH *dh);
 196 int DH_set_length(DH *dh, long length);
 197
 198 DH_METHOD *DH_meth_new(const char *name, int flags);
 199 void DH_meth_free(DH_METHOD *dhm);
 200 DH_METHOD *DH_meth_dup(const DH_METHOD *dhm);
 201 const char *DH_meth_get0_name(const DH_METHOD *dhm);
 202 int DH_meth_set1_name(DH_METHOD *dhm, const char *name);
 203 int DH_meth_get_flags(const DH_METHOD *dhm);
 204 int DH_meth_set_flags(DH_METHOD *dhm, int flags);
 205 void *DH_meth_get0_app_data(const DH_METHOD *dhm);
 206 int DH_meth_set0_app_data(DH_METHOD *dhm, void *app_data);
 207 int (*DH_meth_get_generate_key(const DH_METHOD *dhm)) (DH *);
 208 int DH_meth_set_generate_key(DH_METHOD *dhm, int (*generate_key) (DH *));
 209 int (*DH_meth_get_compute_key(const DH_METHOD *dhm))
 210         (unsigned char *key, const BIGNUM *pub_key, DH *dh);
 211 int DH_meth_set_compute_key(DH_METHOD *dhm,
 212         int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh));
 213 int (*DH_meth_get_bn_mod_exp(const DH_METHOD *dhm))
 214     (const DH *, BIGNUM *, const BIGNUM *, const BIGNUM *, const BIGNUM *,
 215      BN_CTX *, BN_MONT_CTX *);
 216 int DH_meth_set_bn_mod_exp(DH_METHOD *dhm,
 217     int (*bn_mod_exp) (const DH *, BIGNUM *, const BIGNUM *, const BIGNUM *,
 218                        const BIGNUM *, BN_CTX *, BN_MONT_CTX *));
 219 int (*DH_meth_get_init(const DH_METHOD *dhm))(DH *);
 220 int DH_meth_set_init(DH_METHOD *dhm, int (*init)(DH *));
 221 int (*DH_meth_get_finish(const DH_METHOD *dhm)) (DH *);
 222 int DH_meth_set_finish(DH_METHOD *dhm, int (*finish) (DH *));
 223 int (*DH_meth_get_generate_params(const DH_METHOD *dhm))
 224         (DH *, int, int, BN_GENCB *);
 225 int DH_meth_set_generate_params(DH_METHOD *dhm,
 226         int (*generate_params) (DH *, int, int, BN_GENCB *));
 227
 228
 229 # define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \
 230         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 231                         EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL)
 232
 233 # define EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len) \
 234         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 235                         EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN, len, NULL)
 236
 237 # define EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ) \
 238         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 239                         EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL)
 240
 241 # define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \
 242         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 243                         EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL)
 244
 245 # define EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen) \
 246         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
 247                         EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)
 248
 249 # define EVP_PKEY_CTX_set_dhx_rfc5114(ctx, gen) \
 250         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
 251                         EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)
 252
 253 # define EVP_PKEY_CTX_set_dh_nid(ctx, nid) \
 254         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, \
 255                         EVP_PKEY_OP_PARAMGEN | EVP_PKEY_OP_KEYGEN, \
 256                         EVP_PKEY_CTRL_DH_NID, nid, NULL)
 257
 258 int EVP_PKEY_CTX_set_dh_pad(EVP_PKEY_CTX *ctx, int pad);
 259
 260 # define EVP_PKEY_CTX_set_dh_kdf_type(ctx, kdf) \
 261         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 262                                 EVP_PKEY_OP_DERIVE, \
 263                                 EVP_PKEY_CTRL_DH_KDF_TYPE, kdf, NULL)
 264
 265 # define EVP_PKEY_CTX_get_dh_kdf_type(ctx) \
 266         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 267                                 EVP_PKEY_OP_DERIVE, \
 268                                 EVP_PKEY_CTRL_DH_KDF_TYPE, -2, NULL)
 269
 270 # define EVP_PKEY_CTX_set0_dh_kdf_oid(ctx, oid) \
 271         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 272                                 EVP_PKEY_OP_DERIVE, \
 273                                 EVP_PKEY_CTRL_DH_KDF_OID, 0, (void *)(oid))
 274
 275 # define EVP_PKEY_CTX_get0_dh_kdf_oid(ctx, poid) \
 276         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 277                                 EVP_PKEY_OP_DERIVE, \
 278                                 EVP_PKEY_CTRL_GET_DH_KDF_OID, 0, (void *)(poid))
 279
 280 # define EVP_PKEY_CTX_set_dh_kdf_md(ctx, md) \
 281         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 282                                 EVP_PKEY_OP_DERIVE, \
 283                                 EVP_PKEY_CTRL_DH_KDF_MD, 0, (void *)(md))
 284
 285 # define EVP_PKEY_CTX_get_dh_kdf_md(ctx, pmd) \
 286         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 287                                 EVP_PKEY_OP_DERIVE, \
 288                                 EVP_PKEY_CTRL_GET_DH_KDF_MD, 0, (void *)(pmd))
 289
 290 # define EVP_PKEY_CTX_set_dh_kdf_outlen(ctx, len) \
 291         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 292                                 EVP_PKEY_OP_DERIVE, \
 293                                 EVP_PKEY_CTRL_DH_KDF_OUTLEN, len, NULL)
 294
 295 # define EVP_PKEY_CTX_get_dh_kdf_outlen(ctx, plen) \
 296         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 297                                 EVP_PKEY_OP_DERIVE, \
 298                         EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN, 0, (void *)(plen))
 299
 300 # define EVP_PKEY_CTX_set0_dh_kdf_ukm(ctx, p, plen) \
 301         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 302                                 EVP_PKEY_OP_DERIVE, \
 303                                 EVP_PKEY_CTRL_DH_KDF_UKM, plen, (void *)(p))
 304
 305 # define EVP_PKEY_CTX_get0_dh_kdf_ukm(ctx, p) \
 306         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 307                                 EVP_PKEY_OP_DERIVE, \
 308                                 EVP_PKEY_CTRL_GET_DH_KDF_UKM, 0, (void *)(p))
 309
 310 # define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN     (EVP_PKEY_ALG_CTRL + 1)
 311 # define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR     (EVP_PKEY_ALG_CTRL + 2)
 312 # define EVP_PKEY_CTRL_DH_RFC5114                (EVP_PKEY_ALG_CTRL + 3)
 313 # define EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN  (EVP_PKEY_ALG_CTRL + 4)
 314 # define EVP_PKEY_CTRL_DH_PARAMGEN_TYPE          (EVP_PKEY_ALG_CTRL + 5)
 315 # define EVP_PKEY_CTRL_DH_KDF_TYPE               (EVP_PKEY_ALG_CTRL + 6)
 316 # define EVP_PKEY_CTRL_DH_KDF_MD                 (EVP_PKEY_ALG_CTRL + 7)
 317 # define EVP_PKEY_CTRL_GET_DH_KDF_MD             (EVP_PKEY_ALG_CTRL + 8)
 318 # define EVP_PKEY_CTRL_DH_KDF_OUTLEN             (EVP_PKEY_ALG_CTRL + 9)
 319 # define EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN         (EVP_PKEY_ALG_CTRL + 10)
 320 # define EVP_PKEY_CTRL_DH_KDF_UKM                (EVP_PKEY_ALG_CTRL + 11)
 321 # define EVP_PKEY_CTRL_GET_DH_KDF_UKM            (EVP_PKEY_ALG_CTRL + 12)
 322 # define EVP_PKEY_CTRL_DH_KDF_OID                (EVP_PKEY_ALG_CTRL + 13)
 323 # define EVP_PKEY_CTRL_GET_DH_KDF_OID            (EVP_PKEY_ALG_CTRL + 14)
 324 # define EVP_PKEY_CTRL_DH_NID                    (EVP_PKEY_ALG_CTRL + 15)
 325 # define EVP_PKEY_CTRL_DH_PAD                    (EVP_PKEY_ALG_CTRL + 16)
 326
 327 /* KDF types */
 328 # define EVP_PKEY_DH_KDF_NONE                            1
 329 # ifndef OPENSSL_NO_CMS
 330 # define EVP_PKEY_DH_KDF_X9_42                           2
 331 # endif
 332
 333
 334 #  ifdef  __cplusplus
 335 }
 336 #  endif
 337 # endif
 338 #endif