evp_asn1.c

/* crypto/asn1/evp_asn1.c */
/* 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.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/asn1t.h>

int ASN1_TYPE_set_octetstring(ASN1_TYPE *a, unsigned char *data, int len)
{
    ASN1_STRING *os;

    if ((os = ASN1_OCTET_STRING_new()) == NULL)
        return (0);
    if (!ASN1_OCTET_STRING_set(os, data, len)) {
        ASN1_OCTET_STRING_free(os);
        return 0;
    }
    ASN1_TYPE_set(a, V_ASN1_OCTET_STRING, os);
    return (1);
}

/* int max_len:  for returned value    */
int ASN1_TYPE_get_octetstring(ASN1_TYPE *a, unsigned char *data, int max_len)
{
    int ret, num;
    unsigned char *p;

    if ((a->type != V_ASN1_OCTET_STRING) || (a->value.octet_string == NULL)) {
        ASN1err(ASN1_F_ASN1_TYPE_GET_OCTETSTRING, ASN1_R_DATA_IS_WRONG);
        return (-1);
    }
    p = ASN1_STRING_data(a->value.octet_string);
    ret = ASN1_STRING_length(a->value.octet_string);
    if (ret < max_len)
        num = ret;
    else
        num = max_len;
    memcpy(data, p, num);
    return (ret);
}

typedef struct {
    long num;
    ASN1_OCTET_STRING *oct;
} asn1_int_oct;

ASN1_SEQUENCE(asn1_int_oct) = {
        ASN1_SIMPLE(asn1_int_oct, num, LONG),
        ASN1_SIMPLE(asn1_int_oct, oct, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(asn1_int_oct)

DECLARE_ASN1_ITEM(asn1_int_oct)

int ASN1_TYPE_set_int_octetstring(ASN1_TYPE *a, long num, unsigned char *data,
                                  int len)
{
    asn1_int_oct atmp;
    ASN1_OCTET_STRING oct;

    atmp.num = num;
    atmp.oct = &oct;
    oct.data = data;
    oct.type = V_ASN1_OCTET_STRING;
    oct.length = len;
    oct.flags = 0;

    if (ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(asn1_int_oct), &atmp, &a))
        return 1;
    return 0;
}

/*
 * we return the actual length...
 */
/* int max_len:  for returned value    */
int ASN1_TYPE_get_int_octetstring(ASN1_TYPE *a, long *num,
                                  unsigned char *data, int max_len)
{
    asn1_int_oct *atmp = NULL;
    int ret = -1, n;

    if ((a->type != V_ASN1_SEQUENCE) || (a->value.sequence == NULL)) {
        goto err;
    }

    atmp = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(asn1_int_oct), a);

    if (atmp == NULL)
        goto err;

    if (num != NULL)
        *num = atmp->num;

    ret = ASN1_STRING_length(atmp->oct);
    if (max_len > ret)
        n = ret;
    else
        n = max_len;

    if (data != NULL)
        memcpy(data, ASN1_STRING_data(atmp->oct), n);
    if (ret == -1) {
 err:
        ASN1err(ASN1_F_ASN1_TYPE_GET_INT_OCTETSTRING, ASN1_R_DATA_IS_WRONG);
    }
    M_ASN1_free_of(atmp, asn1_int_oct);
    return ret;
}