include/openssl/dh.h

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 HEADER_DH_H
  11 # define HEADER_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/ossl_typ.h>
  20 # if OPENSSL_API_COMPAT < 0x10100000L
  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_COMPAT < 0x10100000L
  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
  80 /* DH_check_pub_key error codes */
  81 # define DH_CHECK_PUBKEY_TOO_SMALL       0x01
  82 # define DH_CHECK_PUBKEY_TOO_LARGE       0x02
  83 # define DH_CHECK_PUBKEY_INVALID         0x04
  84
  85 /*
  86  * primes p where (p-1)/2 is prime too are called "safe"; we define this for
  87  * backward compatibility:
  88  */
  89 # define DH_CHECK_P_NOT_STRONG_PRIME     DH_CHECK_P_NOT_SAFE_PRIME
  90
  91 # define d2i_DHparams_fp(fp,x) \
  92     (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
  93                       (char *(*)())d2i_DHparams, \
  94                       (fp), \
  95                       (unsigned char **)(x))
  96 # define i2d_DHparams_fp(fp,x) \
  97     ASN1_i2d_fp(i2d_DHparams,(fp), (unsigned char *)(x))
  98 # define d2i_DHparams_bio(bp,x) \
  99     ASN1_d2i_bio_of(DH, DH_new, d2i_DHparams, bp, x)
 100 # define i2d_DHparams_bio(bp,x) \
 101     ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)
 102
 103 # define d2i_DHxparams_fp(fp,x) \
 104     (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
 105                       (char *(*)())d2i_DHxparams, \
 106                       (fp), \
 107                       (unsigned char **)(x))
 108 # define i2d_DHxparams_fp(fp,x) \
 109     ASN1_i2d_fp(i2d_DHxparams,(fp), (unsigned char *)(x))
 110 # define d2i_DHxparams_bio(bp,x) \
 111     ASN1_d2i_bio_of(DH, DH_new, d2i_DHxparams, bp, x)
 112 # define i2d_DHxparams_bio(bp,x) \
 113     ASN1_i2d_bio_of_const(DH, i2d_DHxparams, bp, x)
 114
 115 DH *DHparams_dup(DH *);
 116
 117 const DH_METHOD *DH_OpenSSL(void);
 118
 119 void DH_set_default_method(const DH_METHOD *meth);
 120 const DH_METHOD *DH_get_default_method(void);
 121 int DH_set_method(DH *dh, const DH_METHOD *meth);
 122 DH *DH_new_method(ENGINE *engine);
 123
 124 DH *DH_new(void);
 125 void DH_free(DH *dh);
 126 int DH_up_ref(DH *dh);
 127 int DH_bits(const DH *dh);
 128 int DH_size(const DH *dh);
 129 int DH_security_bits(const DH *dh);
 130 #define DH_get_ex_new_index(l, p, newf, dupf, freef) \
 131     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, l, p, newf, dupf, freef)
 132 int DH_set_ex_data(DH *d, int idx, void *arg);
 133 void *DH_get_ex_data(DH *d, int idx);
 134
 135 /* Deprecated version */
 136 DEPRECATEDIN_0_9_8(DH *DH_generate_parameters(int prime_len, int generator,
 137                                               void (*callback) (int, int,
 138                                                                 void *),
 139                                               void *cb_arg))
 140
 141 /* New version */
 142 int DH_generate_parameters_ex(DH *dh, int prime_len, int generator,
 143                               BN_GENCB *cb);
 144
 145 int DH_check_params(const DH *dh, int *ret);
 146 int DH_check(const DH *dh, int *codes);
 147 int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *codes);
 148 int DH_generate_key(DH *dh);
 149 int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh);
 150 int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
 151 DH *d2i_DHparams(DH **a, const unsigned char **pp, long length);
 152 int i2d_DHparams(const DH *a, unsigned char **pp);
 153 DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length);
 154 int i2d_DHxparams(const DH *a, unsigned char **pp);
 155 # ifndef OPENSSL_NO_STDIO
 156 int DHparams_print_fp(FILE *fp, const DH *x);
 157 # endif
 158 int DHparams_print(BIO *bp, const DH *x);
 159
 160 /* RFC 5114 parameters */
 161 DH *DH_get_1024_160(void);
 162 DH *DH_get_2048_224(void);
 163 DH *DH_get_2048_256(void);
 164
 165 /* Named parameters, currently RFC7919 */
 166 DH *DH_new_by_nid(int nid);
 167 int DH_get_nid(const DH *dh);
 168
 169 # ifndef OPENSSL_NO_CMS
 170 /* RFC2631 KDF */
 171 int DH_KDF_X9_42(unsigned char *out, size_t outlen,
 172                  const unsigned char *Z, size_t Zlen,
 173                  ASN1_OBJECT *key_oid,
 174                  const unsigned char *ukm, size_t ukmlen, const EVP_MD *md);
 175 # endif
 176
 177 void DH_get0_pqg(const DH *dh,
 178                  const BIGNUM **p, const BIGNUM **q, const BIGNUM **g);
 179 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
 180 void DH_get0_key(const DH *dh,
 181                  const BIGNUM **pub_key, const BIGNUM **priv_key);
 182 int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
 183 void DH_clear_flags(DH *dh, int flags);
 184 int DH_test_flags(const DH *dh, int flags);
 185 void DH_set_flags(DH *dh, int flags);
 186 ENGINE *DH_get0_engine(DH *d);
 187 long DH_get_length(const DH *dh);
 188 int DH_set_length(DH *dh, long length);
 189
 190 DH_METHOD *DH_meth_new(const char *name, int flags);
 191 void DH_meth_free(DH_METHOD *dhm);
 192 DH_METHOD *DH_meth_dup(const DH_METHOD *dhm);
 193 const char *DH_meth_get0_name(const DH_METHOD *dhm);
 194 int DH_meth_set1_name(DH_METHOD *dhm, const char *name);
 195 int DH_meth_get_flags(DH_METHOD *dhm);
 196 int DH_meth_set_flags(DH_METHOD *dhm, int flags);
 197 void *DH_meth_get0_app_data(const DH_METHOD *dhm);
 198 int DH_meth_set0_app_data(DH_METHOD *dhm, void *app_data);
 199 int (*DH_meth_get_generate_key(const DH_METHOD *dhm)) (DH *);
 200 int DH_meth_set_generate_key(DH_METHOD *dhm, int (*generate_key) (DH *));
 201 int (*DH_meth_get_compute_key(const DH_METHOD *dhm))
 202         (unsigned char *key, const BIGNUM *pub_key, DH *dh);
 203 int DH_meth_set_compute_key(DH_METHOD *dhm,
 204         int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh));
 205 int (*DH_meth_get_bn_mod_exp(const DH_METHOD *dhm))
 206     (const DH *, BIGNUM *, const BIGNUM *, const BIGNUM *, const BIGNUM *,
 207      BN_CTX *, BN_MONT_CTX *);
 208 int DH_meth_set_bn_mod_exp(DH_METHOD *dhm,
 209     int (*bn_mod_exp) (const DH *, BIGNUM *, const BIGNUM *, const BIGNUM *,
 210                        const BIGNUM *, BN_CTX *, BN_MONT_CTX *));
 211 int (*DH_meth_get_init(const DH_METHOD *dhm))(DH *);
 212 int DH_meth_set_init(DH_METHOD *dhm, int (*init)(DH *));
 213 int (*DH_meth_get_finish(const DH_METHOD *dhm)) (DH *);
 214 int DH_meth_set_finish(DH_METHOD *dhm, int (*finish) (DH *));
 215 int (*DH_meth_get_generate_params(const DH_METHOD *dhm))
 216         (DH *, int, int, BN_GENCB *);
 217 int DH_meth_set_generate_params(DH_METHOD *dhm,
 218         int (*generate_params) (DH *, int, int, BN_GENCB *));
 219
 220
 221 # define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \
 222         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 223                         EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL)
 224
 225 # define EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len) \
 226         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 227                         EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN, len, NULL)
 228
 229 # define EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ) \
 230         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 231                         EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL)
 232
 233 # define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \
 234         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 235                         EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL)
 236
 237 # define EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen) \
 238         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
 239                         EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)
 240
 241 # define EVP_PKEY_CTX_set_dhx_rfc5114(ctx, gen) \
 242         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
 243                         EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)
 244
 245 # define EVP_PKEY_CTX_set_dh_nid(ctx, nid) \
 246         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, \
 247                         EVP_PKEY_OP_PARAMGEN | EVP_PKEY_OP_KEYGEN, \
 248                         EVP_PKEY_CTRL_DH_NID, nid, NULL)
 249
 250 # define EVP_PKEY_CTX_set_dh_pad(ctx, pad) \
 251         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_DERIVE, \
 252                           EVP_PKEY_CTRL_DH_PAD, pad, NULL)
 253
 254 # define EVP_PKEY_CTX_set_dh_kdf_type(ctx, kdf) \
 255         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 256                                 EVP_PKEY_OP_DERIVE, \
 257                                 EVP_PKEY_CTRL_DH_KDF_TYPE, kdf, NULL)
 258
 259 # define EVP_PKEY_CTX_get_dh_kdf_type(ctx) \
 260         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 261                                 EVP_PKEY_OP_DERIVE, \
 262                                 EVP_PKEY_CTRL_DH_KDF_TYPE, -2, NULL)
 263
 264 # define EVP_PKEY_CTX_set0_dh_kdf_oid(ctx, oid) \
 265         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 266                                 EVP_PKEY_OP_DERIVE, \
 267                                 EVP_PKEY_CTRL_DH_KDF_OID, 0, (void *)(oid))
 268
 269 # define EVP_PKEY_CTX_get0_dh_kdf_oid(ctx, poid) \
 270         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 271                                 EVP_PKEY_OP_DERIVE, \
 272                                 EVP_PKEY_CTRL_GET_DH_KDF_OID, 0, (void *)(poid))
 273
 274 # define EVP_PKEY_CTX_set_dh_kdf_md(ctx, md) \
 275         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 276                                 EVP_PKEY_OP_DERIVE, \
 277                                 EVP_PKEY_CTRL_DH_KDF_MD, 0, (void *)(md))
 278
 279 # define EVP_PKEY_CTX_get_dh_kdf_md(ctx, pmd) \
 280         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 281                                 EVP_PKEY_OP_DERIVE, \
 282                                 EVP_PKEY_CTRL_GET_DH_KDF_MD, 0, (void *)(pmd))
 283
 284 # define EVP_PKEY_CTX_set_dh_kdf_outlen(ctx, len) \
 285         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 286                                 EVP_PKEY_OP_DERIVE, \
 287                                 EVP_PKEY_CTRL_DH_KDF_OUTLEN, len, NULL)
 288
 289 # define EVP_PKEY_CTX_get_dh_kdf_outlen(ctx, plen) \
 290         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 291                                 EVP_PKEY_OP_DERIVE, \
 292                         EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN, 0, (void *)(plen))
 293
 294 # define EVP_PKEY_CTX_set0_dh_kdf_ukm(ctx, p, plen) \
 295         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 296                                 EVP_PKEY_OP_DERIVE, \
 297                                 EVP_PKEY_CTRL_DH_KDF_UKM, plen, (void *)(p))
 298
 299 # define EVP_PKEY_CTX_get0_dh_kdf_ukm(ctx, p) \
 300         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 301                                 EVP_PKEY_OP_DERIVE, \
 302                                 EVP_PKEY_CTRL_GET_DH_KDF_UKM, 0, (void *)(p))
 303
 304 # define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN     (EVP_PKEY_ALG_CTRL + 1)
 305 # define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR     (EVP_PKEY_ALG_CTRL + 2)
 306 # define EVP_PKEY_CTRL_DH_RFC5114                (EVP_PKEY_ALG_CTRL + 3)
 307 # define EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN  (EVP_PKEY_ALG_CTRL + 4)
 308 # define EVP_PKEY_CTRL_DH_PARAMGEN_TYPE          (EVP_PKEY_ALG_CTRL + 5)
 309 # define EVP_PKEY_CTRL_DH_KDF_TYPE               (EVP_PKEY_ALG_CTRL + 6)
 310 # define EVP_PKEY_CTRL_DH_KDF_MD                 (EVP_PKEY_ALG_CTRL + 7)
 311 # define EVP_PKEY_CTRL_GET_DH_KDF_MD             (EVP_PKEY_ALG_CTRL + 8)
 312 # define EVP_PKEY_CTRL_DH_KDF_OUTLEN             (EVP_PKEY_ALG_CTRL + 9)
 313 # define EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN         (EVP_PKEY_ALG_CTRL + 10)
 314 # define EVP_PKEY_CTRL_DH_KDF_UKM                (EVP_PKEY_ALG_CTRL + 11)
 315 # define EVP_PKEY_CTRL_GET_DH_KDF_UKM            (EVP_PKEY_ALG_CTRL + 12)
 316 # define EVP_PKEY_CTRL_DH_KDF_OID                (EVP_PKEY_ALG_CTRL + 13)
 317 # define EVP_PKEY_CTRL_GET_DH_KDF_OID            (EVP_PKEY_ALG_CTRL + 14)
 318 # define EVP_PKEY_CTRL_DH_NID                    (EVP_PKEY_ALG_CTRL + 15)
 319 # define EVP_PKEY_CTRL_DH_PAD                    (EVP_PKEY_ALG_CTRL + 16)
 320
 321 /* KDF types */
 322 # define EVP_PKEY_DH_KDF_NONE                            1
 323 # ifndef OPENSSL_NO_CMS
 324 # define EVP_PKEY_DH_KDF_X9_42                           2
 325 # endif
 326
 327 int ERR_load_DH_strings(void);
 328
 329 #  ifdef  __cplusplus
 330 }
 331 #  endif
 332 # endif
 333 #endif