/* 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#ifdef OPENSSL_NO_DH#error DH is disabled.#endif#ifndef OPENSSL_NO_BIO#include <openssl/bio.h>#endif#include <openssl/bn.h>#include <openssl/crypto.h>#include <openssl/ossl_typ.h>	#define DH_FLAG_CACHE_MONT_P	0x01#ifdef  __cplusplusextern "C" {#endiftypedef struct dh_st DH;typedef 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;} DH_METHOD;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;	char *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/* 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) (DH *)ASN1_dup((int (*)())i2d_DHparams, \		(char *(*)())d2i_DHparams,(char *)(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) (DH *)ASN1_d2i_bio((char *(*)())DH_new, \		(char *(*)())d2i_DHparams,(bp),(unsigned char **)(x))#ifdef  __cplusplus#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio((int (*)())i2d_DHparams,(bp), \		(unsigned char *)(x))#else#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio(i2d_DHparams,(bp), \		(unsigned char *)(x))#endifconst 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);DH *	DH_generate_parameters(int prime_len,int generator,		void (*callback)(int,int,void *),void *cb_arg);int	DH_check(const DH *dh,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_APIint	DHparams_print_fp(FILE *fp, const DH *x);#endif#ifndef OPENSSL_NO_BIOint	DHparams_print(BIO *bp, const DH *x);#elseint	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_DHPARAMS_PRINT				 100#define DH_F_DHPARAMS_PRINT_FP				 101#define DH_F_DH_COMPUTE_KEY				 102#define DH_F_DH_GENERATE_KEY				 103#define DH_F_DH_GENERATE_PARAMETERS			 104#define DH_F_DH_NEW_METHOD				 105/* Reason codes. */#define DH_R_BAD_GENERATOR				 101#define DH_R_NO_PRIVATE_VALUE				 100#ifdef  __cplusplus}#endif#endif