dh.h revision 280304
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 */ 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 170 171/* DH_check_pub_key error codes */ 172# define DH_CHECK_PUBKEY_TOO_SMALL 0x01 173# define DH_CHECK_PUBKEY_TOO_LARGE 0x02 174 175/* 176 * primes p where (p-1)/2 is prime too are called "safe"; we define this for 177 * backward compatibility: 178 */ 179# define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME 180 181# define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \ 182 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x)) 183# define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \ 184 (unsigned char *)(x)) 185# define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x) 186# define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x) 187 188DH *DHparams_dup(DH *); 189 190const DH_METHOD *DH_OpenSSL(void); 191 192void DH_set_default_method(const DH_METHOD *meth); 193const DH_METHOD *DH_get_default_method(void); 194int DH_set_method(DH *dh, const DH_METHOD *meth); 195DH *DH_new_method(ENGINE *engine); 196 197DH *DH_new(void); 198void DH_free(DH *dh); 199int DH_up_ref(DH *dh); 200int DH_size(const DH *dh); 201int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 202 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func); 203int DH_set_ex_data(DH *d, int idx, void *arg); 204void *DH_get_ex_data(DH *d, int idx); 205 206/* Deprecated version */ 207# ifndef OPENSSL_NO_DEPRECATED 208DH *DH_generate_parameters(int prime_len, int generator, 209 void (*callback) (int, int, void *), void *cb_arg); 210# endif /* !defined(OPENSSL_NO_DEPRECATED) */ 211 212/* New version */ 213int DH_generate_parameters_ex(DH *dh, int prime_len, int generator, 214 BN_GENCB *cb); 215 216int DH_check(const DH *dh, int *codes); 217int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *codes); 218int DH_generate_key(DH *dh); 219int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh); 220DH *d2i_DHparams(DH **a, const unsigned char **pp, long length); 221int i2d_DHparams(const DH *a, unsigned char **pp); 222# ifndef OPENSSL_NO_FP_API 223int DHparams_print_fp(FILE *fp, const DH *x); 224# endif 225# ifndef OPENSSL_NO_BIO 226int DHparams_print(BIO *bp, const DH *x); 227# else 228int DHparams_print(char *bp, const DH *x); 229# endif 230 231# define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \ 232 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \ 233 EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL) 234 235# define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \ 236 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \ 237 EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL) 238 239# define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN (EVP_PKEY_ALG_CTRL + 1) 240# define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR (EVP_PKEY_ALG_CTRL + 2) 241 242/* BEGIN ERROR CODES */ 243/* 244 * The following lines are auto generated by the script mkerr.pl. Any changes 245 * made after this point may be overwritten when the script is next run. 246 */ 247void ERR_load_DH_strings(void); 248 249/* Error codes for the DH functions. */ 250 251/* Function codes. */ 252# define DH_F_COMPUTE_KEY 102 253# define DH_F_DHPARAMS_PRINT_FP 101 254# define DH_F_DH_BUILTIN_GENPARAMS 106 255# define DH_F_DH_COMPUTE_KEY 114 256# define DH_F_DH_GENERATE_KEY 115 257# define DH_F_DH_GENERATE_PARAMETERS_EX 116 258# define DH_F_DH_NEW_METHOD 105 259# define DH_F_DH_PARAM_DECODE 107 260# define DH_F_DH_PRIV_DECODE 110 261# define DH_F_DH_PRIV_ENCODE 111 262# define DH_F_DH_PUB_DECODE 108 263# define DH_F_DH_PUB_ENCODE 109 264# define DH_F_DO_DH_PRINT 100 265# define DH_F_GENERATE_KEY 103 266# define DH_F_GENERATE_PARAMETERS 104 267# define DH_F_PKEY_DH_DERIVE 112 268# define DH_F_PKEY_DH_KEYGEN 113 269 270/* Reason codes. */ 271# define DH_R_BAD_GENERATOR 101 272# define DH_R_BN_DECODE_ERROR 109 273# define DH_R_BN_ERROR 106 274# define DH_R_DECODE_ERROR 104 275# define DH_R_INVALID_PUBKEY 102 276# define DH_R_KEYS_NOT_SET 108 277# define DH_R_KEY_SIZE_TOO_SMALL 110 278# define DH_R_MODULUS_TOO_LARGE 103 279# define DH_R_NON_FIPS_METHOD 111 280# define DH_R_NO_PARAMETERS_SET 107 281# define DH_R_NO_PRIVATE_VALUE 100 282# define DH_R_PARAMETER_ENCODING_ERROR 105 283 284#ifdef __cplusplus 285} 286#endif 287#endif 288