williamr@2: /* crypto/dh/dh.h */
williamr@2: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
williamr@2:  * All rights reserved.
williamr@2:  *
williamr@2:  * This package is an SSL implementation written
williamr@2:  * by Eric Young (eay@cryptsoft.com).
williamr@2:  * The implementation was written so as to conform with Netscapes SSL.
williamr@2:  * 
williamr@2:  * This library is free for commercial and non-commercial use as long as
williamr@2:  * the following conditions are aheared to.  The following conditions
williamr@2:  * apply to all code found in this distribution, be it the RC4, RSA,
williamr@2:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
williamr@2:  * included with this distribution is covered by the same copyright terms
williamr@2:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
williamr@2:  * 
williamr@2:  * Copyright remains Eric Young's, and as such any Copyright notices in
williamr@2:  * the code are not to be removed.
williamr@2:  * If this package is used in a product, Eric Young should be given attribution
williamr@2:  * as the author of the parts of the library used.
williamr@2:  * This can be in the form of a textual message at program startup or
williamr@2:  * in documentation (online or textual) provided with the package.
williamr@2:  * 
williamr@2:  * Redistribution and use in source and binary forms, with or without
williamr@2:  * modification, are permitted provided that the following conditions
williamr@2:  * are met:
williamr@2:  * 1. Redistributions of source code must retain the copyright
williamr@2:  *    notice, this list of conditions and the following disclaimer.
williamr@2:  * 2. Redistributions in binary form must reproduce the above copyright
williamr@2:  *    notice, this list of conditions and the following disclaimer in the
williamr@2:  *    documentation and/or other materials provided with the distribution.
williamr@2:  * 3. All advertising materials mentioning features or use of this software
williamr@2:  *    must display the following acknowledgement:
williamr@2:  *    "This product includes cryptographic software written by
williamr@2:  *     Eric Young (eay@cryptsoft.com)"
williamr@2:  *    The word 'cryptographic' can be left out if the rouines from the library
williamr@2:  *    being used are not cryptographic related :-).
williamr@2:  * 4. If you include any Windows specific code (or a derivative thereof) from 
williamr@2:  *    the apps directory (application code) you must include an acknowledgement:
williamr@2:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
williamr@2:  * 
williamr@2:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
williamr@2:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
williamr@2:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
williamr@2:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
williamr@2:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
williamr@2:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
williamr@2:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
williamr@2:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
williamr@2:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
williamr@2:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
williamr@2:  * SUCH DAMAGE.
williamr@2:  * 
williamr@2:  * The licence and distribution terms for any publically available version or
williamr@2:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
williamr@2:  * copied and put under another distribution licence
williamr@2:  * [including the GNU Public Licence.]
williamr@2:  */
williamr@2: 
williamr@2: #ifndef HEADER_DH_H
williamr@2: #define HEADER_DH_H
williamr@2: 
williamr@2: #if (defined(__SYMBIAN32__) && !defined(SYMBIAN))
williamr@2: #define SYMBIAN
williamr@2: #endif
williamr@2: 
williamr@2: #include <openssl/e_os2.h>
williamr@2: 
williamr@2: #ifdef OPENSSL_NO_DH
williamr@2: #error DH is disabled.
williamr@2: #endif
williamr@2: 
williamr@2: #ifndef OPENSSL_NO_BIO
williamr@2: #include <openssl/bio.h>
williamr@2: #endif
williamr@2: #include <openssl/ossl_typ.h>
williamr@2: #ifndef OPENSSL_NO_DEPRECATED
williamr@2: #include <openssl/bn.h>
williamr@2: #endif
williamr@2: 
williamr@2: #ifndef OPENSSL_DH_MAX_MODULUS_BITS
williamr@2: # define OPENSSL_DH_MAX_MODULUS_BITS	10000
williamr@2: #endif
williamr@2: 
williamr@2: 	
williamr@2: #define DH_FLAG_CACHE_MONT_P     0x01
williamr@2: #define DH_FLAG_NO_EXP_CONSTTIME 0x02 /* new with 0.9.7h; the built-in DH
williamr@2:                                        * implementation now uses constant time
williamr@2:                                        * modular exponentiation for secret exponents
williamr@2:                                        * by default. This flag causes the
williamr@2:                                        * faster variable sliding window method to
williamr@2:                                        * be used for all exponents.
williamr@2:                                        */
williamr@2: 
williamr@2: #ifdef  __cplusplus
williamr@2: extern "C" {
williamr@2: #endif
williamr@2: 
williamr@2: /* Already defined in ossl_typ.h */
williamr@2: /* typedef struct dh_st DH; */
williamr@2: /* typedef struct dh_method DH_METHOD; */
williamr@2: 
williamr@2: struct dh_method
williamr@2: 	{
williamr@2: 	const char *name;
williamr@2: 	/* Methods here */
williamr@2: 	int (*generate_key)(DH *dh);
williamr@2: 	int (*compute_key)(unsigned char *key,const BIGNUM *pub_key,DH *dh);
williamr@2: 	int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a,
williamr@2: 				const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
williamr@2: 				BN_MONT_CTX *m_ctx); /* Can be null */
williamr@2: 
williamr@2: 	int (*init)(DH *dh);
williamr@2: 	int (*finish)(DH *dh);
williamr@2: 	int flags;
williamr@2: 	char *app_data;
williamr@2: 	/* If this is non-NULL, it will be used to generate parameters */
williamr@2: 	int (*generate_params)(DH *dh, int prime_len, int generator, BN_GENCB *cb);
williamr@2: 	};
williamr@2: 
williamr@2: struct dh_st
williamr@2: 	{
williamr@2: 	/* This first argument is used to pick up errors when
williamr@2: 	 * a DH is passed instead of a EVP_PKEY */
williamr@2: 	int pad;
williamr@2: 	int version;
williamr@2: 	BIGNUM *p;
williamr@2: 	BIGNUM *g;
williamr@2: 	long length; /* optional */
williamr@2: 	BIGNUM *pub_key;	/* g^x */
williamr@2: 	BIGNUM *priv_key;	/* x */
williamr@2: 
williamr@2: 	int flags;
williamr@2: 	BN_MONT_CTX *method_mont_p;
williamr@2: 	/* Place holders if we want to do X9.42 DH */
williamr@2: 	BIGNUM *q;
williamr@2: 	BIGNUM *j;
williamr@2: 	unsigned char *seed;
williamr@2: 	int seedlen;
williamr@2: 	BIGNUM *counter;
williamr@2: 
williamr@2: 	int references;
williamr@2: 	CRYPTO_EX_DATA ex_data;
williamr@2: 	const DH_METHOD *meth;
williamr@2: 	ENGINE *engine;
williamr@2: 	};
williamr@2: 
williamr@2: #define DH_GENERATOR_2		2
williamr@2: /* #define DH_GENERATOR_3	3 */
williamr@2: #define DH_GENERATOR_5		5
williamr@2: 
williamr@2: /* DH_check error codes */
williamr@2: #define DH_CHECK_P_NOT_PRIME		0x01
williamr@2: #define DH_CHECK_P_NOT_SAFE_PRIME	0x02
williamr@2: #define DH_UNABLE_TO_CHECK_GENERATOR	0x04
williamr@2: #define DH_NOT_SUITABLE_GENERATOR	0x08
williamr@2: 
williamr@2: /* DH_check_pub_key error codes */
williamr@2: #define DH_CHECK_PUBKEY_TOO_SMALL	0x01
williamr@2: #define DH_CHECK_PUBKEY_TOO_LARGE	0x02
williamr@2: 
williamr@2: /* primes p where (p-1)/2 is prime too are called "safe"; we define
williamr@2:    this for backward compatibility: */
williamr@2: #define DH_CHECK_P_NOT_STRONG_PRIME	DH_CHECK_P_NOT_SAFE_PRIME
williamr@2: 
williamr@2: #define DHparams_dup(x) ASN1_dup_of_const(DH,i2d_DHparams,d2i_DHparams,x)
williamr@2: #define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
williamr@2: 		(char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
williamr@2: #define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
williamr@2: 		(unsigned char *)(x))
williamr@2: #define d2i_DHparams_bio(bp,x) ASN1_d2i_bio_of(DH,DH_new,d2i_DHparams,bp,x)
williamr@2: #define i2d_DHparams_bio(bp,x) ASN1_i2d_bio_of_const(DH,i2d_DHparams,bp,x)
williamr@2: 
williamr@2: IMPORT_C const DH_METHOD *DH_OpenSSL(void);
williamr@2: 
williamr@2: IMPORT_C void DH_set_default_method(const DH_METHOD *meth);
williamr@2: IMPORT_C const DH_METHOD *DH_get_default_method(void);
williamr@2: IMPORT_C int DH_set_method(DH *dh, const DH_METHOD *meth);
williamr@2: IMPORT_C DH *DH_new_method(ENGINE *engine);
williamr@2: 
williamr@2: IMPORT_C DH *	DH_new(void);
williamr@2: IMPORT_C void	DH_free(DH *dh);
williamr@2: IMPORT_C int	DH_up_ref(DH *dh);
williamr@2: IMPORT_C int	DH_size(const DH *dh);
williamr@2: IMPORT_C int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
williamr@2: 	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
williamr@2: IMPORT_C int DH_set_ex_data(DH *d, int idx, void *arg);
williamr@2: IMPORT_C void *DH_get_ex_data(DH *d, int idx);
williamr@2: 
williamr@2: /* Deprecated version */
williamr@2: #ifndef OPENSSL_NO_DEPRECATED
williamr@2: IMPORT_C DH *	DH_generate_parameters(int prime_len,int generator,
williamr@2: 		void (*callback)(int,int,void *),void *cb_arg);
williamr@2: #endif /* !defined(OPENSSL_NO_DEPRECATED) */
williamr@2: 
williamr@2: /* New version */
williamr@2: IMPORT_C int	DH_generate_parameters_ex(DH *dh, int prime_len,int generator, BN_GENCB *cb);
williamr@2: 
williamr@2: IMPORT_C int	DH_check(const DH *dh,int *codes);
williamr@2: IMPORT_C int	DH_check_pub_key(const DH *dh,const BIGNUM *pub_key, int *codes);
williamr@2: IMPORT_C int	DH_generate_key(DH *dh);
williamr@2: IMPORT_C int	DH_compute_key(unsigned char *key,const BIGNUM *pub_key,DH *dh);
williamr@2: IMPORT_C DH *	d2i_DHparams(DH **a,const unsigned char **pp, long length);
williamr@2: IMPORT_C int	i2d_DHparams(const DH *a,unsigned char **pp);
williamr@2: #ifndef OPENSSL_NO_FP_API
williamr@2: IMPORT_C int	DHparams_print_fp(FILE *fp, const DH *x);
williamr@2: #endif
williamr@2: #ifndef OPENSSL_NO_BIO
williamr@2: IMPORT_C int	DHparams_print(BIO *bp, const DH *x);
williamr@2: #else
williamr@2: IMPORT_C int	DHparams_print(char *bp, const DH *x);
williamr@2: #endif
williamr@2: 
williamr@2: /* BEGIN ERROR CODES */
williamr@2: /* The following lines are auto generated by the script mkerr.pl. Any changes
williamr@2:  * made after this point may be overwritten when the script is next run.
williamr@2:  */
williamr@2: IMPORT_C void ERR_load_DH_strings(void);
williamr@2: 
williamr@2: /* Error codes for the DH functions. */
williamr@2: 
williamr@2: /* Function codes. */
williamr@2: #define DH_F_COMPUTE_KEY				 102
williamr@2: #define DH_F_DHPARAMS_PRINT				 100
williamr@2: #define DH_F_DHPARAMS_PRINT_FP				 101
williamr@2: #define DH_F_DH_BUILTIN_GENPARAMS			 106
williamr@2: #define DH_F_DH_NEW_METHOD				 105
williamr@2: #define DH_F_GENERATE_KEY				 103
williamr@2: #define DH_F_GENERATE_PARAMETERS			 104
williamr@2: 
williamr@2: /* Reason codes. */
williamr@2: #define DH_R_BAD_GENERATOR				 101
williamr@2: #define DH_R_NO_PRIVATE_VALUE				 100
williamr@2: #define DH_R_MODULUS_TOO_LARGE				 103
williamr@2: #define DH_R_INVALID_PUBKEY				 102
williamr@2: 
williamr@2: #ifdef  __cplusplus
williamr@2: }
williamr@2: #endif
williamr@2: #endif