dh_asn1.c

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/* dh_asn1.c */
/* Written by Dr Stephen N Henson ([email protected]) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000-2005 The OpenSSL Project.  All rights reserved.
 *
 * 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 above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
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 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
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 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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 *
 * This product includes cryptographic software written by Eric Young
 * ([email protected]).  This product includes software written by Tim
 * Hudson ([email protected]).
 *
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/objects.h>
#include <openssl/asn1t.h>

/* Override the default free and new methods */
static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
                        void *exarg)
{
    if(operation == ASN1_OP_NEW_PRE) {
        *pval = (ASN1_VALUE *)DH_new();
        if(*pval) return 2;
        return 0;
    } else if(operation == ASN1_OP_FREE_PRE) {
        DH_free((DH *)*pval);
        *pval = NULL;
        return 2;
    }
    return 1;
}

ASN1_SEQUENCE_cb(DHparams, dh_cb) = {
    ASN1_SIMPLE(DH, p, BIGNUM),
    ASN1_SIMPLE(DH, g, BIGNUM),
    ASN1_OPT(DH, length, ZLONG),
} ASN1_SEQUENCE_END_cb(DH, DHparams)

IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams)

DH *DHparams_dup(DH *dh)
    {
    return ASN1_item_dup(ASN1_ITEM_rptr(DHparams), dh);
    }