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/* crypto/dh/dh.h */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#ifndef HEADER_DH_H
#define HEADER_DH_H
#include <openssl/e_os2.h>
#ifdef OPENSSL_NO_DH
#error DH is disabled.
#endif
#ifndef OPENSSL_NO_BIO
#include <openssl/bio.h>
#endif
#include <openssl/ossl_typ.h>
#ifndef OPENSSL_NO_DEPRECATED
#include <openssl/bn.h>
#endif
#ifndef OPENSSL_DH_MAX_MODULUS_BITS
# define OPENSSL_DH_MAX_MODULUS_BITS 10000
#endif
#define DH_FLAG_CACHE_MONT_P 0x01
#define DH_FLAG_NO_EXP_CONSTTIME 0x02 /* new with 0.9.7h; the built-in DH
* implementation now uses constant time
* modular exponentiation for secret exponents
* by default. This flag causes the
* faster variable sliding window method to
* be used for all exponents.
*/
#ifdef __cplusplus
extern "C" {
#endif
/* Already defined in ossl_typ.h */
/* typedef struct dh_st DH; */
/* typedef struct dh_method DH_METHOD; */
struct dh_method
{
const char *name;
/* Methods here */
int (*generate_key)(DH *dh);
int (*compute_key)(unsigned char *key,const BIGNUM *pub_key,DH *dh);
int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a,
const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
BN_MONT_CTX *m_ctx); /* Can be null */
int (*init)(DH *dh);
int (*finish)(DH *dh);
int flags;
char *app_data;
/* If this is non-NULL, it will be used to generate parameters */
int (*generate_params)(DH *dh, int prime_len, int generator, BN_GENCB *cb);
};
struct dh_st
{
/* This first argument is used to pick up errors when
* a DH is passed instead of a EVP_PKEY */
int pad;
int version;
BIGNUM *p;
BIGNUM *g;
long length; /* optional */
BIGNUM *pub_key; /* g^x */
BIGNUM *priv_key; /* x */
int flags;
BN_MONT_CTX *method_mont_p;
/* Place holders if we want to do X9.42 DH */
BIGNUM *q;
BIGNUM *j;
unsigned char *seed;
int seedlen;
BIGNUM *counter;
int references;
CRYPTO_EX_DATA ex_data;
const DH_METHOD *meth;
ENGINE *engine;
};
#define DH_GENERATOR_2 2
/* #define DH_GENERATOR_3 3 */
#define DH_GENERATOR_5 5
/* DH_check error codes */
#define DH_CHECK_P_NOT_PRIME 0x01
#define DH_CHECK_P_NOT_SAFE_PRIME 0x02
#define DH_UNABLE_TO_CHECK_GENERATOR 0x04
#define DH_NOT_SUITABLE_GENERATOR 0x08
/* DH_check_pub_key error codes */
#define DH_CHECK_PUBKEY_TOO_SMALL 0x01
#define DH_CHECK_PUBKEY_TOO_LARGE 0x02
/* primes p where (p-1)/2 is prime too are called "safe"; we define
this for backward compatibility: */
#define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME
#define DHparams_dup(x) ASN1_dup_of_const(DH,i2d_DHparams,d2i_DHparams,x)
#define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
(char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
#define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
(unsigned char *)(x))
#define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x)
#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)
const DH_METHOD *DH_OpenSSL(void);
void DH_set_default_method(const DH_METHOD *meth);
const DH_METHOD *DH_get_default_method(void);
int DH_set_method(DH *dh, const DH_METHOD *meth);
DH *DH_new_method(ENGINE *engine);
DH * DH_new(void);
void DH_free(DH *dh);
int DH_up_ref(DH *dh);
int DH_size(const DH *dh);
int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
int DH_set_ex_data(DH *d, int idx, void *arg);
void *DH_get_ex_data(DH *d, int idx);
/* Deprecated version */
#ifndef OPENSSL_NO_DEPRECATED
DH * DH_generate_parameters(int prime_len,int generator,
void (*callback)(int,int,void *),void *cb_arg);
#endif /* !defined(OPENSSL_NO_DEPRECATED) */
/* New version */
int DH_generate_parameters_ex(DH *dh, int prime_len,int generator, BN_GENCB *cb);
int DH_check(const DH *dh,int *codes);
int DH_check_pub_key(const DH *dh,const BIGNUM *pub_key, int *codes);
int DH_generate_key(DH *dh);
int DH_compute_key(unsigned char *key,const BIGNUM *pub_key,DH *dh);
DH * d2i_DHparams(DH **a,const unsigned char **pp, long length);
int i2d_DHparams(const DH *a,unsigned char **pp);
#ifndef OPENSSL_NO_FP_API
int DHparams_print_fp(FILE *fp, const DH *x);
#endif
#ifndef OPENSSL_NO_BIO
int DHparams_print(BIO *bp, const DH *x);
#else
int DHparams_print(char *bp, const DH *x);
#endif
/* BEGIN ERROR CODES */
/* The following lines are auto generated by the script mkerr.pl. Any changes
* made after this point may be overwritten when the script is next run.
*/
void ERR_load_DH_strings(void);
/* Error codes for the DH functions. */
/* Function codes. */
#define DH_F_COMPUTE_KEY 102
#define DH_F_DHPARAMS_PRINT 100
#define DH_F_DHPARAMS_PRINT_FP 101
#define DH_F_DH_BUILTIN_GENPARAMS 106
#define DH_F_DH_NEW_METHOD 105
#define DH_F_GENERATE_KEY 103
#define DH_F_GENERATE_PARAMETERS 104
/* Reason codes. */
#define DH_R_BAD_GENERATOR 101
#define DH_R_INVALID_PUBKEY 102
#define DH_R_MODULUS_TOO_LARGE 103
#define DH_R_NO_PRIVATE_VALUE 100
#ifdef __cplusplus
}
#endif
#endif
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