dh.h revision 291719
1/* crypto/dh/dh.h */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#ifndef HEADER_DH_H 60# define HEADER_DH_H 61 62# include <openssl/e_os2.h> 63 64# ifdef OPENSSL_NO_DH 65# error DH is disabled. 66# endif 67 68# ifndef OPENSSL_NO_BIO 69# include <openssl/bio.h> 70# endif 71# include <openssl/ossl_typ.h> 72# ifndef OPENSSL_NO_DEPRECATED 73# include <openssl/bn.h> 74# endif 75 76# ifndef OPENSSL_DH_MAX_MODULUS_BITS 77# define OPENSSL_DH_MAX_MODULUS_BITS 10000 78# endif 79 80# define DH_FLAG_CACHE_MONT_P 0x01 81 82/* 83 * new with 0.9.7h; the built-in DH 84 * implementation now uses constant time 85 * modular exponentiation for secret exponents 86 * by default. This flag causes the 87 * faster variable sliding window method to 88 * be used for all exponents. 89 */ 90# define DH_FLAG_NO_EXP_CONSTTIME 0x02 91 92/* 93 * If this flag is set the DH method is FIPS compliant and can be used in 94 * FIPS mode. This is set in the validated module method. If an application 95 * sets this flag in its own methods it is its reposibility to ensure the 96 * result is compliant. 97 */ 98 99# define DH_FLAG_FIPS_METHOD 0x0400 100 101/* 102 * If this flag is set the operations normally disabled in FIPS mode are 103 * permitted it is then the applications responsibility to ensure that the 104 * usage is compliant. 105 */ 106 107# define DH_FLAG_NON_FIPS_ALLOW 0x0400 108 109#ifdef __cplusplus 110extern "C" { 111#endif 112 113/* Already defined in ossl_typ.h */ 114/* typedef struct dh_st DH; */ 115/* typedef struct dh_method DH_METHOD; */ 116 117struct dh_method { 118 const char *name; 119 /* Methods here */ 120 int (*generate_key) (DH *dh); 121 int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh); 122 /* Can be null */ 123 int (*bn_mod_exp) (const DH *dh, BIGNUM *r, const BIGNUM *a, 124 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, 125 BN_MONT_CTX *m_ctx); 126 int (*init) (DH *dh); 127 int (*finish) (DH *dh); 128 int flags; 129 char *app_data; 130 /* If this is non-NULL, it will be used to generate parameters */ 131 int (*generate_params) (DH *dh, int prime_len, int generator, 132 BN_GENCB *cb); 133}; 134 135struct dh_st { 136 /* 137 * This first argument is used to pick up errors when a DH is passed 138 * instead of a EVP_PKEY 139 */ 140 int pad; 141 int version; 142 BIGNUM *p; 143 BIGNUM *g; 144 long length; /* optional */ 145 BIGNUM *pub_key; /* g^x % p */ 146 BIGNUM *priv_key; /* x */ 147 int flags; 148 BN_MONT_CTX *method_mont_p; 149 /* Place holders if we want to do X9.42 DH */ 150 BIGNUM *q; 151 BIGNUM *j; 152 unsigned char *seed; 153 int seedlen; 154 BIGNUM *counter; 155 int references; 156 CRYPTO_EX_DATA ex_data; 157 const DH_METHOD *meth; 158 ENGINE *engine; 159}; 160 161# define DH_GENERATOR_2 2 162/* #define DH_GENERATOR_3 3 */ 163# define DH_GENERATOR_5 5 164 165/* DH_check error codes */ 166# define DH_CHECK_P_NOT_PRIME 0x01 167# define DH_CHECK_P_NOT_SAFE_PRIME 0x02 168# define DH_UNABLE_TO_CHECK_GENERATOR 0x04 169# define DH_NOT_SUITABLE_GENERATOR 0x08 170# define DH_CHECK_Q_NOT_PRIME 0x10 171# define DH_CHECK_INVALID_Q_VALUE 0x20 172# define DH_CHECK_INVALID_J_VALUE 0x40 173 174/* DH_check_pub_key error codes */ 175# define DH_CHECK_PUBKEY_TOO_SMALL 0x01 176# define DH_CHECK_PUBKEY_TOO_LARGE 0x02 177 178/* 179 * primes p where (p-1)/2 is prime too are called "safe"; we define this for 180 * backward compatibility: 181 */ 182# define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME 183 184# define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \ 185 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x)) 186# define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \ 187 (unsigned char *)(x)) 188# define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x) 189# define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x) 190 191DH *DHparams_dup(DH *); 192 193const DH_METHOD *DH_OpenSSL(void); 194 195void DH_set_default_method(const DH_METHOD *meth); 196const DH_METHOD *DH_get_default_method(void); 197int DH_set_method(DH *dh, const DH_METHOD *meth); 198DH *DH_new_method(ENGINE *engine); 199 200DH *DH_new(void); 201void DH_free(DH *dh); 202int DH_up_ref(DH *dh); 203int DH_size(const DH *dh); 204int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 205 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func); 206int DH_set_ex_data(DH *d, int idx, void *arg); 207void *DH_get_ex_data(DH *d, int idx); 208 209/* Deprecated version */ 210# ifndef OPENSSL_NO_DEPRECATED 211DH *DH_generate_parameters(int prime_len, int generator, 212 void (*callback) (int, int, void *), void *cb_arg); 213# endif /* !defined(OPENSSL_NO_DEPRECATED) */ 214 215/* New version */ 216int DH_generate_parameters_ex(DH *dh, int prime_len, int generator, 217 BN_GENCB *cb); 218 219int DH_check(const DH *dh, int *codes); 220int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *codes); 221int DH_generate_key(DH *dh); 222int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh); 223int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh); 224DH *d2i_DHparams(DH **a, const unsigned char **pp, long length); 225int i2d_DHparams(const DH *a, unsigned char **pp); 226DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length); 227int i2d_DHxparams(const DH *a, unsigned char **pp); 228# ifndef OPENSSL_NO_FP_API 229int DHparams_print_fp(FILE *fp, const DH *x); 230# endif 231# ifndef OPENSSL_NO_BIO 232int DHparams_print(BIO *bp, const DH *x); 233# else 234int DHparams_print(char *bp, const DH *x); 235# endif 236 237/* RFC 5114 parameters */ 238DH *DH_get_1024_160(void); 239DH *DH_get_2048_224(void); 240DH *DH_get_2048_256(void); 241 242/* RFC2631 KDF */ 243int DH_KDF_X9_42(unsigned char *out, size_t outlen, 244 const unsigned char *Z, size_t Zlen, 245 ASN1_OBJECT *key_oid, 246 const unsigned char *ukm, size_t ukmlen, const EVP_MD *md); 247 248# define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \ 249 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \ 250 EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL) 251 252# define EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len) \ 253 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \ 254 EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN, len, NULL) 255 256# define EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ) \ 257 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \ 258 EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL) 259 260# define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \ 261 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \ 262 EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL) 263 264# define EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen) \ 265 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \ 266 EVP_PKEY_CTRL_DH_RFC5114, gen, NULL) 267 268# define EVP_PKEY_CTX_set_dhx_rfc5114(ctx, gen) \ 269 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \ 270 EVP_PKEY_CTRL_DH_RFC5114, gen, NULL) 271 272# define EVP_PKEY_CTX_set_dh_kdf_type(ctx, kdf) \ 273 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ 274 EVP_PKEY_OP_DERIVE, \ 275 EVP_PKEY_CTRL_DH_KDF_TYPE, kdf, NULL) 276 277# define EVP_PKEY_CTX_get_dh_kdf_type(ctx) \ 278 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ 279 EVP_PKEY_OP_DERIVE, \ 280 EVP_PKEY_CTRL_DH_KDF_TYPE, -2, NULL) 281 282# define EVP_PKEY_CTX_set0_dh_kdf_oid(ctx, oid) \ 283 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ 284 EVP_PKEY_OP_DERIVE, \ 285 EVP_PKEY_CTRL_DH_KDF_OID, 0, (void *)oid) 286 287# define EVP_PKEY_CTX_get0_dh_kdf_oid(ctx, poid) \ 288 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ 289 EVP_PKEY_OP_DERIVE, \ 290 EVP_PKEY_CTRL_GET_DH_KDF_OID, 0, (void *)poid) 291 292# define EVP_PKEY_CTX_set_dh_kdf_md(ctx, md) \ 293 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ 294 EVP_PKEY_OP_DERIVE, \ 295 EVP_PKEY_CTRL_DH_KDF_MD, 0, (void *)md) 296 297# define EVP_PKEY_CTX_get_dh_kdf_md(ctx, pmd) \ 298 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ 299 EVP_PKEY_OP_DERIVE, \ 300 EVP_PKEY_CTRL_GET_DH_KDF_MD, 0, (void *)pmd) 301 302# define EVP_PKEY_CTX_set_dh_kdf_outlen(ctx, len) \ 303 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ 304 EVP_PKEY_OP_DERIVE, \ 305 EVP_PKEY_CTRL_DH_KDF_OUTLEN, len, NULL) 306 307# define EVP_PKEY_CTX_get_dh_kdf_outlen(ctx, plen) \ 308 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ 309 EVP_PKEY_OP_DERIVE, \ 310 EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN, 0, (void *)plen) 311 312# define EVP_PKEY_CTX_set0_dh_kdf_ukm(ctx, p, plen) \ 313 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ 314 EVP_PKEY_OP_DERIVE, \ 315 EVP_PKEY_CTRL_DH_KDF_UKM, plen, (void *)p) 316 317# define EVP_PKEY_CTX_get0_dh_kdf_ukm(ctx, p) \ 318 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \ 319 EVP_PKEY_OP_DERIVE, \ 320 EVP_PKEY_CTRL_GET_DH_KDF_UKM, 0, (void *)p) 321 322# define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN (EVP_PKEY_ALG_CTRL + 1) 323# define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR (EVP_PKEY_ALG_CTRL + 2) 324# define EVP_PKEY_CTRL_DH_RFC5114 (EVP_PKEY_ALG_CTRL + 3) 325# define EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN (EVP_PKEY_ALG_CTRL + 4) 326# define EVP_PKEY_CTRL_DH_PARAMGEN_TYPE (EVP_PKEY_ALG_CTRL + 5) 327# define EVP_PKEY_CTRL_DH_KDF_TYPE (EVP_PKEY_ALG_CTRL + 6) 328# define EVP_PKEY_CTRL_DH_KDF_MD (EVP_PKEY_ALG_CTRL + 7) 329# define EVP_PKEY_CTRL_GET_DH_KDF_MD (EVP_PKEY_ALG_CTRL + 8) 330# define EVP_PKEY_CTRL_DH_KDF_OUTLEN (EVP_PKEY_ALG_CTRL + 9) 331# define EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN (EVP_PKEY_ALG_CTRL + 10) 332# define EVP_PKEY_CTRL_DH_KDF_UKM (EVP_PKEY_ALG_CTRL + 11) 333# define EVP_PKEY_CTRL_GET_DH_KDF_UKM (EVP_PKEY_ALG_CTRL + 12) 334# define EVP_PKEY_CTRL_DH_KDF_OID (EVP_PKEY_ALG_CTRL + 13) 335# define EVP_PKEY_CTRL_GET_DH_KDF_OID (EVP_PKEY_ALG_CTRL + 14) 336 337/* KDF types */ 338# define EVP_PKEY_DH_KDF_NONE 1 339# define EVP_PKEY_DH_KDF_X9_42 2 340 341/* BEGIN ERROR CODES */ 342/* 343 * The following lines are auto generated by the script mkerr.pl. Any changes 344 * made after this point may be overwritten when the script is next run. 345 */ 346void ERR_load_DH_strings(void); 347 348/* Error codes for the DH functions. */ 349 350/* Function codes. */ 351# define DH_F_COMPUTE_KEY 102 352# define DH_F_DHPARAMS_PRINT_FP 101 353# define DH_F_DH_BUILTIN_GENPARAMS 106 354# define DH_F_DH_CMS_DECRYPT 117 355# define DH_F_DH_CMS_SET_PEERKEY 118 356# define DH_F_DH_CMS_SET_SHARED_INFO 119 357# define DH_F_DH_COMPUTE_KEY 114 358# define DH_F_DH_GENERATE_KEY 115 359# define DH_F_DH_GENERATE_PARAMETERS_EX 116 360# define DH_F_DH_NEW_METHOD 105 361# define DH_F_DH_PARAM_DECODE 107 362# define DH_F_DH_PRIV_DECODE 110 363# define DH_F_DH_PRIV_ENCODE 111 364# define DH_F_DH_PUB_DECODE 108 365# define DH_F_DH_PUB_ENCODE 109 366# define DH_F_DO_DH_PRINT 100 367# define DH_F_GENERATE_KEY 103 368# define DH_F_GENERATE_PARAMETERS 104 369# define DH_F_PKEY_DH_DERIVE 112 370# define DH_F_PKEY_DH_KEYGEN 113 371 372/* Reason codes. */ 373# define DH_R_BAD_GENERATOR 101 374# define DH_R_BN_DECODE_ERROR 109 375# define DH_R_BN_ERROR 106 376# define DH_R_DECODE_ERROR 104 377# define DH_R_INVALID_PUBKEY 102 378# define DH_R_KDF_PARAMETER_ERROR 112 379# define DH_R_KEYS_NOT_SET 108 380# define DH_R_KEY_SIZE_TOO_SMALL 110 381# define DH_R_MODULUS_TOO_LARGE 103 382# define DH_R_NON_FIPS_METHOD 111 383# define DH_R_NO_PARAMETERS_SET 107 384# define DH_R_NO_PRIVATE_VALUE 100 385# define DH_R_PARAMETER_ENCODING_ERROR 105 386# define DH_R_PEER_KEY_ERROR 113 387# define DH_R_SHARED_INFO_ERROR 114 388 389#ifdef __cplusplus 390} 391#endif 392#endif 393