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 OPENSSL_DH_FIPS_MIN_MODULUS_BITS 1024 81 82 #define DH_FLAG_CACHE_MONT_P 0x01 83 #define DH_FLAG_NO_EXP_CONSTTIME 0x02 /* 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 91 #ifdef __cplusplus 92 extern "C" { 93 #endif 94 95 /* Already defined in ossl_typ.h */ 96 /* typedef struct dh_st DH; */ 97 /* typedef struct dh_method DH_METHOD; */ 98 99 struct dh_method 100 { 101 const char *name; 102 /* Methods here */ 103 int (*generate_key)(DH *dh); 104 int (*compute_key)(unsigned char *key,const BIGNUM *pub_key,DH *dh); 105 int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a, 106 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, 107 BN_MONT_CTX *m_ctx); /* Can be null */ 108 109 int (*init)(DH *dh); 110 int (*finish)(DH *dh); 111 int flags; 112 char *app_data; 113 /* If this is non-NULL, it will be used to generate parameters */ 114 int (*generate_params)(DH *dh, int prime_len, int generator, BN_GENCB *cb); 115 }; 116 117 struct dh_st 118 { 119 /* This first argument is used to pick up errors when 120 * a DH is passed instead of a EVP_PKEY */ 121 int pad; 122 int version; 123 BIGNUM *p; 124 BIGNUM *g; 125 long length; /* optional */ 126 BIGNUM *pub_key; /* g^x */ 127 BIGNUM *priv_key; /* x */ 128 129 int flags; 130 BN_MONT_CTX *method_mont_p; 131 /* Place holders if we want to do X9.42 DH */ 132 BIGNUM *q; 133 BIGNUM *j; 134 unsigned char *seed; 135 int seedlen; 136 BIGNUM *counter; 137 138 int references; 139 CRYPTO_EX_DATA ex_data; 140 const DH_METHOD *meth; 141 ENGINE *engine; 142 }; 143 144 #define DH_GENERATOR_2 2 145 /* #define DH_GENERATOR_3 3 */ 146 #define DH_GENERATOR_5 5 147 148 /* DH_check error codes */ 149 #define DH_CHECK_P_NOT_PRIME 0x01 150 #define DH_CHECK_P_NOT_SAFE_PRIME 0x02 151 #define DH_UNABLE_TO_CHECK_GENERATOR 0x04 152 #define DH_NOT_SUITABLE_GENERATOR 0x08 153 154 /* DH_check_pub_key error codes */ 155 #define DH_CHECK_PUBKEY_TOO_SMALL 0x01 156 #define DH_CHECK_PUBKEY_TOO_LARGE 0x02 157 158 /* primes p where (p-1)/2 is prime too are called "safe"; we define 159 this for backward compatibility: */ 160 #define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME 161 162 #define DHparams_dup(x) ASN1_dup_of_const(DH,i2d_DHparams,d2i_DHparams,x) 163 #define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \ 164 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x)) 165 #define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \ 166 (unsigned char *)(x)) 167 #define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x) 168 #define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x) 169 170 const DH_METHOD *DH_OpenSSL(void); 171 172 #ifdef OPENSSL_FIPS 173 DH * FIPS_dh_new(void); 174 void FIPS_dh_free(DH *dh); 175 #endif 176 177 void DH_set_default_method(const DH_METHOD *meth); 178 const DH_METHOD *DH_get_default_method(void); 179 int DH_set_method(DH *dh, const DH_METHOD *meth); 180 DH *DH_new_method(ENGINE *engine); 181 182 DH * DH_new(void); 183 void DH_free(DH *dh); 184 int DH_up_ref(DH *dh); 185 int DH_size(const DH *dh); 186 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 187 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func); 188 int DH_set_ex_data(DH *d, int idx, void *arg); 189 void *DH_get_ex_data(DH *d, int idx); 190 191 /* Deprecated version */ 192 #ifndef OPENSSL_NO_DEPRECATED 193 DH * DH_generate_parameters(int prime_len,int generator, 194 void (*callback)(int,int,void *),void *cb_arg); 195 #endif /* !defined(OPENSSL_NO_DEPRECATED) */ 196 197 /* New version */ 198 int DH_generate_parameters_ex(DH *dh, int prime_len,int generator, BN_GENCB *cb); 199 200 int DH_check(const DH *dh,int *codes); 201 int DH_check_pub_key(const DH *dh,const BIGNUM *pub_key, int *codes); 202 int DH_generate_key(DH *dh); 203 int DH_compute_key(unsigned char *key,const BIGNUM *pub_key,DH *dh); 204 DH * d2i_DHparams(DH **a,const unsigned char **pp, long length); 205 int i2d_DHparams(const DH *a,unsigned char **pp); 206 #ifndef OPENSSL_NO_FP_API 207 int DHparams_print_fp(FILE *fp, const DH *x); 208 #endif 209 #ifndef OPENSSL_NO_BIO 210 int DHparams_print(BIO *bp, const DH *x); 211 #else 212 int DHparams_print(char *bp, const DH *x); 213 #endif 214 215 /* BEGIN ERROR CODES */ 216 /* The following lines are auto generated by the script mkerr.pl. Any changes 217 * made after this point may be overwritten when the script is next run. 218 */ 219 void ERR_load_DH_strings(void); 220 221 /* Error codes for the DH functions. */ 222 223 /* Function codes. */ 224 #define DH_F_COMPUTE_KEY 102 225 #define DH_F_DHPARAMS_PRINT 100 226 #define DH_F_DHPARAMS_PRINT_FP 101 227 #define DH_F_DH_BUILTIN_GENPARAMS 106 228 #define DH_F_DH_COMPUTE_KEY 107 229 #define DH_F_DH_GENERATE_KEY 108 230 #define DH_F_DH_GENERATE_PARAMETERS 109 231 #define DH_F_DH_NEW_METHOD 105 232 #define DH_F_GENERATE_KEY 103 233 #define DH_F_GENERATE_PARAMETERS 104 234 235 /* Reason codes. */ 236 #define DH_R_BAD_GENERATOR 101 237 #define DH_R_INVALID_PUBKEY 102 238 #define DH_R_KEY_SIZE_TOO_SMALL 104 239 #define DH_R_MODULUS_TOO_LARGE 103 240 #define DH_R_NO_PRIVATE_VALUE 100 241 242 #ifdef __cplusplus 243 } 244 #endif 245 #endif 246