openssl/crypto/asn1/a_set.c

/* crypto/asn1/a_set.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_mac.h>

#ifndef NO_ASN1_OLD

typedef struct {
    unsigned char *pbData;
    int cbData;
} MYBLOB;

/*
 * SetBlobCmp This function compares two elements of SET_OF block
 */
static int SetBlobCmp(const void *elem1, const void *elem2)
{
    const MYBLOB *b1 = (const MYBLOB *)elem1;
    const MYBLOB *b2 = (const MYBLOB *)elem2;
    int r;

    r = memcmp(b1->pbData, b2->pbData,
               b1->cbData < b2->cbData ? b1->cbData : b2->cbData);
    if (r != 0)
        return r;
    return b1->cbData - b2->cbData;
}

/*
 * int is_set: if TRUE, then sort the contents (i.e. it isn't a SEQUENCE)
 */
int i2d_ASN1_SET(STACK * a, unsigned char **pp, i2d_of_void *i2d, int ex_tag,
                 int ex_class, int is_set)
{
    int ret = 0, r;
    int i;
    unsigned char *p;
    unsigned char *pStart, *pTempMem;
    MYBLOB *rgSetBlob;
    int totSize;

    if (a == NULL)
        return (0);
    for (i = sk_num(a) - 1; i >= 0; i--)
        ret += i2d(sk_value(a, i), NULL);
    r = ASN1_object_size(1, ret, ex_tag);
    if (pp == NULL)
        return (r);

    p = *pp;
    ASN1_put_object(&p, 1, ret, ex_tag, ex_class);

/* Modified by gp@nsj.co.jp */
    /* And then again by Ben */
    /* And again by Steve */

    if (!is_set || (sk_num(a) < 2)) {
        for (i = 0; i < sk_num(a); i++)
            i2d(sk_value(a, i), &p);

        *pp = p;
        return (r);
    }

    pStart = p;                 /* Catch the beg of Setblobs */
    /* In this array we will store the SET blobs */
    rgSetBlob = (MYBLOB *) OPENSSL_malloc(sk_num(a) * sizeof(MYBLOB));
    if (rgSetBlob == NULL) {
        ASN1err(ASN1_F_I2D_ASN1_SET, ERR_R_MALLOC_FAILURE);
        return (0);
    }

    for (i = 0; i < sk_num(a); i++) {
        rgSetBlob[i].pbData = p; /* catch each set encode blob */
        i2d(sk_value(a, i), &p);
        rgSetBlob[i].cbData = p - rgSetBlob[i].pbData; /* Length of this
                                                        * SetBlob */
    }
    *pp = p;
    totSize = p - pStart;       /* This is the total size of all set blobs */

    /*
     * Now we have to sort the blobs. I am using a simple algo. *Sort ptrs
     * *Copy to temp-mem *Copy from temp-mem to user-mem
     */
    qsort(rgSetBlob, sk_num(a), sizeof(MYBLOB), SetBlobCmp);
    if (!(pTempMem = OPENSSL_malloc(totSize))) {
        ASN1err(ASN1_F_I2D_ASN1_SET, ERR_R_MALLOC_FAILURE);
        return (0);
    }

/* Copy to temp mem */
    p = pTempMem;
    for (i = 0; i < sk_num(a); ++i) {
        memcpy(p, rgSetBlob[i].pbData, rgSetBlob[i].cbData);
        p += rgSetBlob[i].cbData;
    }

/* Copy back to user mem*/
    memcpy(pStart, pTempMem, totSize);
    OPENSSL_free(pTempMem);
    OPENSSL_free(rgSetBlob);

    return (r);
}

STACK *d2i_ASN1_SET(STACK ** a, const unsigned char **pp, long length,
                    d2i_of_void *d2i, void (*free_func) (void *), int ex_tag,
                    int ex_class)
{
    ASN1_const_CTX c;
    STACK *ret = NULL;

    if ((a == NULL) || ((*a) == NULL)) {
        if ((ret = sk_new_null()) == NULL) {
            ASN1err(ASN1_F_D2I_ASN1_SET, ERR_R_MALLOC_FAILURE);
            goto err;
        }
    } else
        ret = (*a);

    c.p = *pp;
    c.max = (length == 0) ? 0 : (c.p + length);

    c.inf = ASN1_get_object(&c.p, &c.slen, &c.tag, &c.xclass, c.max - c.p);
    if (c.inf & 0x80)
        goto err;
    if (ex_class != c.xclass) {
        ASN1err(ASN1_F_D2I_ASN1_SET, ASN1_R_BAD_CLASS);
        goto err;
    }
    if (ex_tag != c.tag) {
        ASN1err(ASN1_F_D2I_ASN1_SET, ASN1_R_BAD_TAG);
        goto err;
    }
    if ((c.slen + c.p) > c.max) {
        ASN1err(ASN1_F_D2I_ASN1_SET, ASN1_R_LENGTH_ERROR);
        goto err;
    }
    /*
     * check for infinite constructed - it can be as long as the amount of
     * data passed to us
     */
    if (c.inf == (V_ASN1_CONSTRUCTED + 1))
        c.slen = length + *pp - c.p;
    c.max = c.p + c.slen;

    while (c.p < c.max) {
        char *s;

        if (M_ASN1_D2I_end_sequence())
            break;
        /*
         * XXX: This was called with 4 arguments, incorrectly, it seems if
         * ((s=func(NULL,&c.p,c.slen,c.max-c.p)) == NULL)
         */
        if ((s = d2i(NULL, &c.p, c.slen)) == NULL) {
            ASN1err(ASN1_F_D2I_ASN1_SET, ASN1_R_ERROR_PARSING_SET_ELEMENT);
            asn1_add_error(*pp, (int)(c.q - *pp));
            goto err;
        }
        if (!sk_push(ret, s))
            goto err;
    }
    if (a != NULL)
        (*a) = ret;
    *pp = c.p;
    return (ret);
 err:
    if ((ret != NULL) && ((a == NULL) || (*a != ret))) {
        if (free_func != NULL)
            sk_pop_free(ret, free_func);
        else
            sk_free(ret);
    }
    return (NULL);
}

#endif