/* crypto/asn1/a_bytes.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>

static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c,

                                  int depth);

static ASN1_STRING *int_d2i_ASN1_bytes(ASN1_STRING **a,

                                       const unsigned char **pp, long length,

                                       int Ptag, int Pclass, int depth,

                                       int *perr);

/*

 * type is a 'bitmap' of acceptable string types.

 */

ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp,

                                 long length, int type)

{

    ASN1_STRING *ret = NULL;

    const unsigned char *p;

    unsigned char *s;

    long len;

    int inf, tag, xclass;

    int i = 0;

    p = *pp;

    inf = ASN1_get_object(&p, &len, &tag, &xclass, length);

    if (inf & 0x80)

        goto err;

    if (tag >= 32) {

        i = ASN1_R_TAG_VALUE_TOO_HIGH;

        goto err;

    }

    if (!(ASN1_tag2bit(tag) & type)) {

        i = ASN1_R_WRONG_TYPE;

        goto err;

    }

    /* If a bit-string, exit early */

    if (tag == V_ASN1_BIT_STRING)

        return (d2i_ASN1_BIT_STRING(a, pp, length));

    if ((a == NULL) || ((*a) == NULL)) {

        if ((ret = ASN1_STRING_new()) == NULL)

            return (NULL);

    } else

        ret = (*a);

    if (len != 0) {

        s = OPENSSL_malloc((int)len + 1);

        if (s == NULL) {

            i = ERR_R_MALLOC_FAILURE;

            goto err;

        }

        memcpy(s, p, (int)len);

        s[len] = '\0';

        p += len;

    } else

        s = NULL;

    if (ret->data != NULL)

        OPENSSL_free(ret->data);

    ret->length = (int)len;

    ret->data = s;

    ret->type = tag;

    if (a != NULL)

        (*a) = ret;

    *pp = p;

    return (ret);

 err:

    ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES, i);

    if ((ret != NULL) && ((a == NULL) || (*a != ret)))

        ASN1_STRING_free(ret);

    return (NULL);

}

int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)

{

    int ret, r, constructed;

    unsigned char *p;

    if (a == NULL)

        return (0);

    if (tag == V_ASN1_BIT_STRING)

        return (i2d_ASN1_BIT_STRING(a, pp));

    ret = a->length;

    r = ASN1_object_size(0, ret, tag);

    if (pp == NULL)

        return (r);

    p = *pp;

    if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))

        constructed = 1;

    else

        constructed = 0;

    ASN1_put_object(&p, constructed, ret, tag, xclass);

    memcpy(p, a->data, a->length);

    p += a->length;

    *pp = p;

    return (r);

}

/*

 * Maximum recursion depth of d2i_ASN1_bytes(): much more than should be

 * encountered in pratice.

 */

#define ASN1_BYTES_MAXDEPTH 20

ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp,

                            long length, int Ptag, int Pclass)

{

    int err = 0;

    ASN1_STRING *s = int_d2i_ASN1_bytes(a, pp, length, Ptag, Pclass, 0, &err);

    if (err != 0)

        ASN1err(ASN1_F_D2I_ASN1_BYTES, err);

    return s;

}

static ASN1_STRING *int_d2i_ASN1_bytes(ASN1_STRING **a,

                                       const unsigned char **pp, long length,

                                       int Ptag, int Pclass,

                                       int depth, int *perr)

{

    ASN1_STRING *ret = NULL;

    const unsigned char *p;

    unsigned char *s;

    long len;

    int inf, tag, xclass;

    if (depth > ASN1_BYTES_MAXDEPTH) {

        *perr = ASN1_R_NESTED_ASN1_STRING;

        return NULL;

    }

    if ((a == NULL) || ((*a) == NULL)) {

        if ((ret = ASN1_STRING_new()) == NULL)

            return (NULL);

    } else

        ret = (*a);

    p = *pp;

    inf = ASN1_get_object(&p, &len, &tag, &xclass, length);

    if (inf & 0x80) {

        *perr = ASN1_R_BAD_OBJECT_HEADER;

        goto err;

    }

    if (tag != Ptag) {

        *perr = ASN1_R_WRONG_TAG;

        goto err;

    }

    if (inf & V_ASN1_CONSTRUCTED) {

        ASN1_const_CTX c;

        c.error = 0;

        c.pp = pp;

        c.p = p;

        c.inf = inf;

        c.slen = len;

        c.tag = Ptag;

        c.xclass = Pclass;

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

        if (!asn1_collate_primitive(ret, &c, depth)) {

            *perr = c.error;

            goto err;

        } else {

            p = c.p;

        }

    } else {

        if (len != 0) {

            if ((ret->length < len) || (ret->data == NULL)) {

                s = OPENSSL_malloc((int)len + 1);

                if (s == NULL) {

                    *perr = ERR_R_MALLOC_FAILURE;

                    goto err;

                }

                if (ret->data != NULL)

                    OPENSSL_free(ret->data);

            } else

                s = ret->data;

            memcpy(s, p, (int)len);

            s[len] = '\0';

            p += len;

        } else {

            s = NULL;

            if (ret->data != NULL)

                OPENSSL_free(ret->data);

        }

        ret->length = (int)len;

        ret->data = s;

        ret->type = Ptag;

    }

    if (a != NULL)

        (*a) = ret;

    *pp = p;

    return (ret);

 err:

    if ((ret != NULL) && ((a == NULL) || (*a != ret)))

        ASN1_STRING_free(ret);

    return (NULL);

}

/*

 * We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse them

 * into the one structure that is then returned

 */

/*

 * There have been a few bug fixes for this function from Paul Keogh

 * <paul.keogh@sse.ie>, many thanks to him

 */

static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c,

                                  int depth)

{

    ASN1_STRING *os = NULL;

    BUF_MEM b;

    int num;

    b.length = 0;

    b.max = 0;

    b.data = NULL;

    if (a == NULL) {

        c->error = ERR_R_PASSED_NULL_PARAMETER;

        goto err;

    }

    num = 0;

    for (;;) {

        if (c->inf & 1) {

            c->eos = ASN1_const_check_infinite_end(&c->p,

                                                   (long)(c->max - c->p));

            if (c->eos)

                break;

        } else {

            if (c->slen <= 0)

                break;

        }

        c->q = c->p;

        if (int_d2i_ASN1_bytes(&os, &c->p, c->max - c->p, c->tag, c->xclass,

                               depth + 1, &c->error) == NULL) {

            goto err;

        }

        if (!BUF_MEM_grow_clean(&b, num + os->length)) {

            c->error = ERR_R_BUF_LIB;

            goto err;

        }

        memcpy(&(b.data[num]), os->data, os->length);

        if (!(c->inf & 1))

            c->slen -= (c->p - c->q);

        num += os->length;

    }

    if (!asn1_const_Finish(c))

        goto err;

    a->length = num;

    if (a->data != NULL)

        OPENSSL_free(a->data);

    a->data = (unsigned char *)b.data;

    if (os != NULL)

        ASN1_STRING_free(os);

    return (1);

 err:

    if (os != NULL)

        ASN1_STRING_free(os);

    if (b.data != NULL)

        OPENSSL_free(b.data);

    return (0);

}