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 #ifdef NO_DH 63 #error DH is disabled. 64 #endif 65 66 #ifndef NO_BIO 67 #include <openssl/bio.h> 68 #endif 69 #include <openssl/bn.h> 70 #include <openssl/crypto.h> 71 72 #define DH_FLAG_CACHE_MONT_P 0x01 73 74 #ifdef __cplusplus 75 extern "C" { 76 #endif 77 78 typedef struct dh_st DH; 79 80 typedef struct dh_method { 81 const char *name; 82 /* Methods here */ 83 int (*generate_key)(DH *dh); 84 int (*compute_key)(unsigned char *key,BIGNUM *pub_key,DH *dh); 85 int (*bn_mod_exp)(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p, 86 const BIGNUM *m, BN_CTX *ctx, 87 BN_MONT_CTX *m_ctx); /* Can be null */ 88 89 int (*init)(DH *dh); 90 int (*finish)(DH *dh); 91 int flags; 92 char *app_data; 93 } DH_METHOD; 94 95 struct dh_st 96 { 97 /* This first argument is used to pick up errors when 98 * a DH is passed instead of a EVP_PKEY */ 99 int pad; 100 int version; 101 BIGNUM *p; 102 BIGNUM *g; 103 int length; /* optional */ 104 BIGNUM *pub_key; /* g^x */ 105 BIGNUM *priv_key; /* x */ 106 107 int flags; 108 char *method_mont_p; 109 /* Place holders if we want to do X9.42 DH */ 110 BIGNUM *q; 111 BIGNUM *j; 112 unsigned char *seed; 113 int seedlen; 114 BIGNUM *counter; 115 116 int references; 117 CRYPTO_EX_DATA ex_data; 118 #if 0 119 DH_METHOD *meth; 120 #else 121 struct engine_st *engine; 122 #endif 123 }; 124 125 #define DH_GENERATOR_2 2 126 /* #define DH_GENERATOR_3 3 */ 127 #define DH_GENERATOR_5 5 128 129 /* DH_check error codes */ 130 #define DH_CHECK_P_NOT_PRIME 0x01 131 #define DH_CHECK_P_NOT_SAFE_PRIME 0x02 132 #define DH_UNABLE_TO_CHECK_GENERATOR 0x04 133 #define DH_NOT_SUITABLE_GENERATOR 0x08 134 135 /* primes p where (p-1)/2 is prime too are called "safe"; we define 136 this for backward compatibility: */ 137 #define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME 138 139 #define DHparams_dup(x) (DH *)ASN1_dup((int (*)())i2d_DHparams, \ 140 (char *(*)())d2i_DHparams,(char *)(x)) 141 #define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \ 142 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x)) 143 #define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \ 144 (unsigned char *)(x)) 145 #define d2i_DHparams_bio(bp,x) (DH *)ASN1_d2i_bio((char *(*)())DH_new, \ 146 (char *(*)())d2i_DHparams,(bp),(unsigned char **)(x)) 147 #ifdef __cplusplus 148 #define i2d_DHparams_bio(bp,x) ASN1_i2d_bio((int (*)())i2d_DHparams,(bp), \ 149 (unsigned char *)(x)) 150 #else 151 #define i2d_DHparams_bio(bp,x) ASN1_i2d_bio(i2d_DHparams,(bp), \ 152 (unsigned char *)(x)) 153 #endif 154 155 DH_METHOD *DH_OpenSSL(void); 156 157 void DH_set_default_openssl_method(DH_METHOD *meth); 158 DH_METHOD *DH_get_default_openssl_method(void); 159 #if 0 160 DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth); 161 DH *DH_new_method(DH_METHOD *meth); 162 #else 163 int DH_set_method(DH *dh, struct engine_st *engine); 164 DH *DH_new_method(struct engine_st *engine); 165 #endif 166 167 DH * DH_new(void); 168 void DH_free(DH *dh); 169 int DH_size(DH *dh); 170 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 171 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func); 172 int DH_set_ex_data(DH *d, int idx, void *arg); 173 void *DH_get_ex_data(DH *d, int idx); 174 DH * DH_generate_parameters(int prime_len,int generator, 175 void (*callback)(int,int,void *),void *cb_arg); 176 int DH_check(DH *dh,int *codes); 177 int DH_generate_key(DH *dh); 178 int DH_compute_key(unsigned char *key,BIGNUM *pub_key,DH *dh); 179 DH * d2i_DHparams(DH **a,unsigned char **pp, long length); 180 int i2d_DHparams(DH *a,unsigned char **pp); 181 #ifndef NO_FP_API 182 int DHparams_print_fp(FILE *fp, DH *x); 183 #endif 184 #ifndef NO_BIO 185 int DHparams_print(BIO *bp, DH *x); 186 #else 187 int DHparams_print(char *bp, DH *x); 188 #endif 189 void ERR_load_DH_strings(void ); 190 191 /* BEGIN ERROR CODES */ 192 /* The following lines are auto generated by the script mkerr.pl. Any changes 193 * made after this point may be overwritten when the script is next run. 194 */ 195 196 /* Error codes for the DH functions. */ 197 198 /* Function codes. */ 199 #define DH_F_DHPARAMS_PRINT 100 200 #define DH_F_DHPARAMS_PRINT_FP 101 201 #define DH_F_DH_COMPUTE_KEY 102 202 #define DH_F_DH_GENERATE_KEY 103 203 #define DH_F_DH_GENERATE_PARAMETERS 104 204 #define DH_F_DH_NEW 105 205 206 /* Reason codes. */ 207 #define DH_R_NO_PRIVATE_VALUE 100 208 209 #ifdef __cplusplus 210 } 211 #endif 212 #endif 213 214