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
  24 # ifdef  __cplusplus
  25 extern "C" {
  26 # endif
  27
  28 # ifndef OPENSSL_DH_MAX_MODULUS_BITS
  29 #  define OPENSSL_DH_MAX_MODULUS_BITS    10000
  30 # endif
  31
  32 # define OPENSSL_DH_FIPS_MIN_MODULUS_BITS 1024
  33
  34 # define DH_FLAG_CACHE_MONT_P     0x01
  35
  36 # if OPENSSL_API_COMPAT < 0x10100000L
  37 /*
  38  * Does nothing. Previously this switched off constant time behaviour.
  39  */
  40 #  define DH_FLAG_NO_EXP_CONSTTIME 0x00
  41 # endif
  42
  43 /*
  44  * If this flag is set the DH method is FIPS compliant and can be used in
  45  * FIPS mode. This is set in the validated module method. If an application
  46  * sets this flag in its own methods it is its responsibility to ensure the
  47  * result is compliant.
  48  */
  49
  50 # define DH_FLAG_FIPS_METHOD                     0x0400
  51
  52 /*
  53  * If this flag is set the operations normally disabled in FIPS mode are
  54  * permitted it is then the applications responsibility to ensure that the
  55  * usage is compliant.
  56  */
  57
  58 # define DH_FLAG_NON_FIPS_ALLOW                  0x0400
  59
  60 /* Already defined in ossl_typ.h */
  61 /* typedef struct dh_st DH; */
  62 /* typedef struct dh_method DH_METHOD; */
  63
  64 DECLARE_ASN1_ITEM(DHparams)
  65
  66 # define DH_GENERATOR_2          2
  67 /* #define DH_GENERATOR_3       3 */
  68 # define DH_GENERATOR_5          5
  69
  70 /* DH_check error codes */
  71 # define DH_CHECK_P_NOT_PRIME            0x01
  72 # define DH_CHECK_P_NOT_SAFE_PRIME       0x02
  73 # define DH_UNABLE_TO_CHECK_GENERATOR    0x04
  74 # define DH_NOT_SUITABLE_GENERATOR       0x08
  75 # define DH_CHECK_Q_NOT_PRIME            0x10
  76 # define DH_CHECK_INVALID_Q_VALUE        0x20
  77 # define DH_CHECK_INVALID_J_VALUE        0x40
  78
  79 /* DH_check_pub_key error codes */
  80 # define DH_CHECK_PUBKEY_TOO_SMALL       0x01
  81 # define DH_CHECK_PUBKEY_TOO_LARGE       0x02
  82 # define DH_CHECK_PUBKEY_INVALID         0x04
  83
  84 /*
  85  * primes p where (p-1)/2 is prime too are called "safe"; we define this for
  86  * backward compatibility:
  87  */
  88 # define DH_CHECK_P_NOT_STRONG_PRIME     DH_CHECK_P_NOT_SAFE_PRIME
  89
  90 # define d2i_DHparams_fp(fp,x) \
  91     (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
  92                       (char *(*)())d2i_DHparams, \
  93                       (fp), \
  94                       (unsigned char **)(x))
  95 # define i2d_DHparams_fp(fp,x) \
  96     ASN1_i2d_fp(i2d_DHparams,(fp), (unsigned char *)(x))
  97 # define d2i_DHparams_bio(bp,x) \
  98     ASN1_d2i_bio_of(DH, DH_new, d2i_DHparams, bp, x)
  99 # define i2d_DHparams_bio(bp,x) \
 100     ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)
 101
 102 # define d2i_DHxparams_fp(fp,x) \
 103     (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
 104                       (char *(*)())d2i_DHxparams, \
 105                       (fp), \
 106                       (unsigned char **)(x))
 107 # define i2d_DHxparams_fp(fp,x) \
 108     ASN1_i2d_fp(i2d_DHxparams,(fp), (unsigned char *)(x))
 109 # define d2i_DHxparams_bio(bp,x) \
 110     ASN1_d2i_bio_of(DH, DH_new, d2i_DHxparams, bp, x)
 111 # define i2d_DHxparams_bio(bp,x) \
 112     ASN1_i2d_bio_of_const(DH, i2d_DHxparams, bp, x)
 113
 114 DH *DHparams_dup(DH *);
 115
 116 const DH_METHOD *DH_OpenSSL(void);
 117
 118 void DH_set_default_method(const DH_METHOD *meth);
 119 const DH_METHOD *DH_get_default_method(void);
 120 int DH_set_method(DH *dh, const DH_METHOD *meth);
 121 DH *DH_new_method(ENGINE *engine);
 122
 123 DH *DH_new(void);
 124 void DH_free(DH *dh);
 125 int DH_up_ref(DH *dh);
 126 int DH_bits(const DH *dh);
 127 int DH_size(const DH *dh);
 128 int DH_security_bits(const DH *dh);
 129 #define DH_get_ex_new_index(l, p, newf, dupf, freef) \
 130     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, l, p, newf, dupf, freef)
 131 int DH_set_ex_data(DH *d, int idx, void *arg);
 132 void *DH_get_ex_data(DH *d, int idx);
 133
 134 /* Deprecated version */
 135 DEPRECATEDIN_0_9_8(DH *DH_generate_parameters(int prime_len, int generator,
 136                                               void (*callback) (int, int,
 137                                                                 void *),
 138                                               void *cb_arg))
 139
 140 /* New version */
 141 int DH_generate_parameters_ex(DH *dh, int prime_len, int generator,
 142                               BN_GENCB *cb);
 143
 144 int DH_check_params(const DH *dh, int *ret);
 145 int DH_check(const DH *dh, int *codes);
 146 int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *codes);
 147 int DH_generate_key(DH *dh);
 148 int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh);
 149 int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
 150 DH *d2i_DHparams(DH **a, const unsigned char **pp, long length);
 151 int i2d_DHparams(const DH *a, unsigned char **pp);
 152 DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length);
 153 int i2d_DHxparams(const DH *a, unsigned char **pp);
 154 # ifndef OPENSSL_NO_STDIO
 155 int DHparams_print_fp(FILE *fp, const DH *x);
 156 # endif
 157 int DHparams_print(BIO *bp, const DH *x);
 158
 159 /* RFC 5114 parameters */
 160 DH *DH_get_1024_160(void);
 161 DH *DH_get_2048_224(void);
 162 DH *DH_get_2048_256(void);
 163
 164 # ifndef OPENSSL_NO_CMS
 165 /* RFC2631 KDF */
 166 int DH_KDF_X9_42(unsigned char *out, size_t outlen,
 167                  const unsigned char *Z, size_t Zlen,
 168                  ASN1_OBJECT *key_oid,
 169                  const unsigned char *ukm, size_t ukmlen, const EVP_MD *md);
 170 # endif
 171
 172 void DH_get0_pqg(const DH *dh,
 173                  const BIGNUM **p, const BIGNUM **q, const BIGNUM **g);
 174 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
 175 void DH_get0_key(const DH *dh,
 176                  const BIGNUM **pub_key, const BIGNUM **priv_key);
 177 int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
 178 void DH_clear_flags(DH *dh, int flags);
 179 int DH_test_flags(const DH *dh, int flags);
 180 void DH_set_flags(DH *dh, int flags);
 181 ENGINE *DH_get0_engine(DH *d);
 182 long DH_get_length(const DH *dh);
 183 int DH_set_length(DH *dh, long length);
 184
 185 DH_METHOD *DH_meth_new(const char *name, int flags);
 186 void DH_meth_free(DH_METHOD *dhm);
 187 DH_METHOD *DH_meth_dup(const DH_METHOD *dhm);
 188 const char *DH_meth_get0_name(const DH_METHOD *dhm);
 189 int DH_meth_set1_name(DH_METHOD *dhm, const char *name);
 190 int DH_meth_get_flags(DH_METHOD *dhm);
 191 int DH_meth_set_flags(DH_METHOD *dhm, int flags);
 192 void *DH_meth_get0_app_data(const DH_METHOD *dhm);
 193 int DH_meth_set0_app_data(DH_METHOD *dhm, void *app_data);
 194 int (*DH_meth_get_generate_key(const DH_METHOD *dhm)) (DH *);
 195 int DH_meth_set_generate_key(DH_METHOD *dhm, int (*generate_key) (DH *));
 196 int (*DH_meth_get_compute_key(const DH_METHOD *dhm))
 197         (unsigned char *key, const BIGNUM *pub_key, DH *dh);
 198 int DH_meth_set_compute_key(DH_METHOD *dhm,
 199         int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh));
 200 int (*DH_meth_get_bn_mod_exp(const DH_METHOD *dhm))
 201     (const DH *, BIGNUM *, const BIGNUM *, const BIGNUM *, const BIGNUM *,
 202      BN_CTX *, BN_MONT_CTX *);
 203 int DH_meth_set_bn_mod_exp(DH_METHOD *dhm,
 204     int (*bn_mod_exp) (const DH *, BIGNUM *, const BIGNUM *, const BIGNUM *,
 205                        const BIGNUM *, BN_CTX *, BN_MONT_CTX *));
 206 int (*DH_meth_get_init(const DH_METHOD *dhm))(DH *);
 207 int DH_meth_set_init(DH_METHOD *dhm, int (*init)(DH *));
 208 int (*DH_meth_get_finish(const DH_METHOD *dhm)) (DH *);
 209 int DH_meth_set_finish(DH_METHOD *dhm, int (*finish) (DH *));
 210 int (*DH_meth_get_generate_params(const DH_METHOD *dhm))
 211         (DH *, int, int, BN_GENCB *);
 212 int DH_meth_set_generate_params(DH_METHOD *dhm,
 213         int (*generate_params) (DH *, int, int, BN_GENCB *));
 214
 215
 216 # define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \
 217         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 218                         EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL)
 219
 220 # define EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len) \
 221         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 222                         EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN, len, NULL)
 223
 224 # define EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ) \
 225         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 226                         EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL)
 227
 228 # define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \
 229         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
 230                         EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL)
 231
 232 # define EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen) \
 233         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
 234                         EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)
 235
 236 # define EVP_PKEY_CTX_set_dhx_rfc5114(ctx, gen) \
 237         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
 238                         EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)
 239
 240 # define EVP_PKEY_CTX_set_dh_kdf_type(ctx, kdf) \
 241         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 242                                 EVP_PKEY_OP_DERIVE, \
 243                                 EVP_PKEY_CTRL_DH_KDF_TYPE, kdf, NULL)
 244
 245 # define EVP_PKEY_CTX_get_dh_kdf_type(ctx) \
 246         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 247                                 EVP_PKEY_OP_DERIVE, \
 248                                 EVP_PKEY_CTRL_DH_KDF_TYPE, -2, NULL)
 249
 250 # define EVP_PKEY_CTX_set0_dh_kdf_oid(ctx, oid) \
 251         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 252                                 EVP_PKEY_OP_DERIVE, \
 253                                 EVP_PKEY_CTRL_DH_KDF_OID, 0, (void *)(oid))
 254
 255 # define EVP_PKEY_CTX_get0_dh_kdf_oid(ctx, poid) \
 256         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 257                                 EVP_PKEY_OP_DERIVE, \
 258                                 EVP_PKEY_CTRL_GET_DH_KDF_OID, 0, (void *)(poid))
 259
 260 # define EVP_PKEY_CTX_set_dh_kdf_md(ctx, md) \
 261         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 262                                 EVP_PKEY_OP_DERIVE, \
 263                                 EVP_PKEY_CTRL_DH_KDF_MD, 0, (void *)(md))
 264
 265 # define EVP_PKEY_CTX_get_dh_kdf_md(ctx, pmd) \
 266         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 267                                 EVP_PKEY_OP_DERIVE, \
 268                                 EVP_PKEY_CTRL_GET_DH_KDF_MD, 0, (void *)(pmd))
 269
 270 # define EVP_PKEY_CTX_set_dh_kdf_outlen(ctx, len) \
 271         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 272                                 EVP_PKEY_OP_DERIVE, \
 273                                 EVP_PKEY_CTRL_DH_KDF_OUTLEN, len, NULL)
 274
 275 # define EVP_PKEY_CTX_get_dh_kdf_outlen(ctx, plen) \
 276         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 277                                 EVP_PKEY_OP_DERIVE, \
 278                         EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN, 0, (void *)(plen))
 279
 280 # define EVP_PKEY_CTX_set0_dh_kdf_ukm(ctx, p, plen) \
 281         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 282                                 EVP_PKEY_OP_DERIVE, \
 283                                 EVP_PKEY_CTRL_DH_KDF_UKM, plen, (void *)(p))
 284
 285 # define EVP_PKEY_CTX_get0_dh_kdf_ukm(ctx, p) \
 286         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
 287                                 EVP_PKEY_OP_DERIVE, \
 288                                 EVP_PKEY_CTRL_GET_DH_KDF_UKM, 0, (void *)(p))
 289
 290 # define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN     (EVP_PKEY_ALG_CTRL + 1)
 291 # define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR     (EVP_PKEY_ALG_CTRL + 2)
 292 # define EVP_PKEY_CTRL_DH_RFC5114                (EVP_PKEY_ALG_CTRL + 3)
 293 # define EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN  (EVP_PKEY_ALG_CTRL + 4)
 294 # define EVP_PKEY_CTRL_DH_PARAMGEN_TYPE          (EVP_PKEY_ALG_CTRL + 5)
 295 # define EVP_PKEY_CTRL_DH_KDF_TYPE               (EVP_PKEY_ALG_CTRL + 6)
 296 # define EVP_PKEY_CTRL_DH_KDF_MD                 (EVP_PKEY_ALG_CTRL + 7)
 297 # define EVP_PKEY_CTRL_GET_DH_KDF_MD             (EVP_PKEY_ALG_CTRL + 8)
 298 # define EVP_PKEY_CTRL_DH_KDF_OUTLEN             (EVP_PKEY_ALG_CTRL + 9)
 299 # define EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN         (EVP_PKEY_ALG_CTRL + 10)
 300 # define EVP_PKEY_CTRL_DH_KDF_UKM                (EVP_PKEY_ALG_CTRL + 11)
 301 # define EVP_PKEY_CTRL_GET_DH_KDF_UKM            (EVP_PKEY_ALG_CTRL + 12)
 302 # define EVP_PKEY_CTRL_DH_KDF_OID                (EVP_PKEY_ALG_CTRL + 13)
 303 # define EVP_PKEY_CTRL_GET_DH_KDF_OID            (EVP_PKEY_ALG_CTRL + 14)
 304
 305 /* KDF types */
 306 # define EVP_PKEY_DH_KDF_NONE                            1
 307 # ifndef OPENSSL_NO_CMS
 308 # define EVP_PKEY_DH_KDF_X9_42                           2
 309 # endif
 310
 311 /* BEGIN ERROR CODES */
 312 /*
 313  * The following lines are auto generated by the script mkerr.pl. Any changes
 314  * made after this point may be overwritten when the script is next run.
 315  */
 316
 317 int ERR_load_DH_strings(void);
 318
 319 /* Error codes for the DH functions. */
 320
 321 /* Function codes. */
 322 # define DH_F_COMPUTE_KEY                                 102
 323 # define DH_F_DHPARAMS_PRINT_FP                           101
 324 # define DH_F_DH_BUILTIN_GENPARAMS                        106
 325 # define DH_F_DH_CMS_DECRYPT                              114
 326 # define DH_F_DH_CMS_SET_PEERKEY                          115
 327 # define DH_F_DH_CMS_SET_SHARED_INFO                      116
 328 # define DH_F_DH_METH_DUP                                 117
 329 # define DH_F_DH_METH_NEW                                 118
 330 # define DH_F_DH_METH_SET1_NAME                           119
 331 # define DH_F_DH_NEW_METHOD                               105
 332 # define DH_F_DH_PARAM_DECODE                             107
 333 # define DH_F_DH_PRIV_DECODE                              110
 334 # define DH_F_DH_PRIV_ENCODE                              111
 335 # define DH_F_DH_PUB_DECODE                               108
 336 # define DH_F_DH_PUB_ENCODE                               109
 337 # define DH_F_DO_DH_PRINT                                 100
 338 # define DH_F_GENERATE_KEY                                103
 339 # define DH_F_PKEY_DH_DERIVE                              112
 340 # define DH_F_PKEY_DH_KEYGEN                              113
 341
 342 /* Reason codes. */
 343 # define DH_R_BAD_GENERATOR                               101
 344 # define DH_R_BN_DECODE_ERROR                             109
 345 # define DH_R_BN_ERROR                                    106
 346 # define DH_R_DECODE_ERROR                                104
 347 # define DH_R_INVALID_PUBKEY                              102
 348 # define DH_R_KDF_PARAMETER_ERROR                         112
 349 # define DH_R_KEYS_NOT_SET                                108
 350 # define DH_R_MODULUS_TOO_LARGE                           103
 351 # define DH_R_NO_PARAMETERS_SET                           107
 352 # define DH_R_NO_PRIVATE_VALUE                            100
 353 # define DH_R_PARAMETER_ENCODING_ERROR                    105
 354 # define DH_R_PEER_KEY_ERROR                              111
 355 # define DH_R_SHARED_INFO_ERROR                           113
 356
 357 #  ifdef  __cplusplus
 358 }
 359 #  endif
 360 # endif
 361 #endif