a_object.c

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/* crypto/asn1/a_object.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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 <limits.h>
#include "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/asn1.h>
#include <openssl/objects.h>
#include <openssl/bn.h>

int i2d_ASN1_OBJECT(ASN1_OBJECT *a, unsigned char **pp)
    {
    unsigned char *p;
    int objsize;

    if ((a == NULL) || (a->data == NULL)) return(0);

    objsize = ASN1_object_size(0,a->length,V_ASN1_OBJECT);
    if (pp == NULL) return objsize;

    p= *pp;
    ASN1_put_object(&p,0,a->length,V_ASN1_OBJECT,V_ASN1_UNIVERSAL);
    memcpy(p,a->data,a->length);
    p+=a->length;

    *pp=p;
    return(objsize);
    }

int a2d_ASN1_OBJECT(unsigned char *out, int olen, const char *buf, int num)
    {
    int i,first,len=0,c, use_bn;
    char ftmp[24], *tmp = ftmp;
    int tmpsize = sizeof ftmp;
    const char *p;
    unsigned long l;
    BIGNUM *bl = NULL;

    if (num == 0)
        return(0);
    else if (num == -1)
        num=strlen(buf);

    p=buf;
    c= *(p++);
    num--;
    if ((c >= '0') && (c <= '2'))
        {
        first= c-'0';
        }
    else
        {
        ASN1err(ASN1_F_A2D_ASN1_OBJECT,ASN1_R_FIRST_NUM_TOO_LARGE);
        goto err;
        }

    if (num <= 0)
        {
        ASN1err(ASN1_F_A2D_ASN1_OBJECT,ASN1_R_MISSING_SECOND_NUMBER);
        goto err;
        }
    c= *(p++);
    num--;
    for (;;)
        {
        if (num <= 0) break;
        if ((c != '.') && (c != ' '))
            {
            ASN1err(ASN1_F_A2D_ASN1_OBJECT,ASN1_R_INVALID_SEPARATOR);
            goto err;
            }
        l=0;
        use_bn = 0;
        for (;;)
            {
            if (num <= 0) break;
            num--;
            c= *(p++);
            if ((c == ' ') || (c == '.'))
                break;
            if ((c < '0') || (c > '9'))
                {
                ASN1err(ASN1_F_A2D_ASN1_OBJECT,ASN1_R_INVALID_DIGIT);
                goto err;
                }
            if (!use_bn && l >= ((ULONG_MAX - 80) / 10L))
                {
                use_bn = 1;
                if (!bl)
                    bl = BN_new();
                if (!bl || !BN_set_word(bl, l))
                    goto err;
                }
            if (use_bn)
                {
                if (!BN_mul_word(bl, 10L)
                    || !BN_add_word(bl, c-'0'))
                    goto err;
                }
            else
                l=l*10L+(long)(c-'0');
            }
        if (len == 0)
            {
            if ((first < 2) && (l >= 40))
                {
                ASN1err(ASN1_F_A2D_ASN1_OBJECT,ASN1_R_SECOND_NUMBER_TOO_LARGE);
                goto err;
                }
            if (use_bn)
                {
                if (!BN_add_word(bl, first * 40))
                    goto err;
                }
            else
                l+=(long)first*40;
            }
        i=0;
        if (use_bn)
            {
            int blsize;
            blsize = BN_num_bits(bl);
            blsize = (blsize + 6)/7;
            if (blsize > tmpsize)
                {
                if (tmp != ftmp)
                    OPENSSL_free(tmp);
                tmpsize = blsize + 32;
                tmp = OPENSSL_malloc(tmpsize);
                if (!tmp)
                    goto err;
                }
            while(blsize--)
                tmp[i++] = (unsigned char)BN_div_word(bl, 0x80L);
            }
        else
            {
                    
            for (;;)
                {
                tmp[i++]=(unsigned char)l&0x7f;
                l>>=7L;
                if (l == 0L) break;
                }

            }
        if (out != NULL)
            {
            if (len+i > olen)
                {
                ASN1err(ASN1_F_A2D_ASN1_OBJECT,ASN1_R_BUFFER_TOO_SMALL);
                goto err;
                }
            while (--i > 0)
                out[len++]=tmp[i]|0x80;
            out[len++]=tmp[0];
            }
        else
            len+=i;
        }
    if (tmp != ftmp)
        OPENSSL_free(tmp);
    if (bl)
        BN_free(bl);
    return(len);
err:
    if (tmp != ftmp)
        OPENSSL_free(tmp);
    if (bl)
        BN_free(bl);
    return(0);
    }

int i2t_ASN1_OBJECT(char *buf, int buf_len, ASN1_OBJECT *a)
{
    return OBJ_obj2txt(buf, buf_len, a, 0);
}

int i2a_ASN1_OBJECT(BIO *bp, ASN1_OBJECT *a)
    {
    char buf[80], *p = buf;
    int i;

    if ((a == NULL) || (a->data == NULL))
        return(BIO_write(bp,"NULL",4));
    i=i2t_ASN1_OBJECT(buf,sizeof buf,a);
    if (i > (int)(sizeof(buf) - 1))
        {
        p = OPENSSL_malloc(i + 1);
        if (!p)
            return -1;
        i2t_ASN1_OBJECT(p,i + 1,a);
        }
    if (i <= 0)
        return BIO_write(bp, "<INVALID>", 9);
    BIO_write(bp,p,i);
    if (p != buf)
        OPENSSL_free(p);
    return(i);
    }

ASN1_OBJECT *d2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,
         long length)
{
    const unsigned char *p;
    long len;
    int tag,xclass;
    int inf,i;
    ASN1_OBJECT *ret = NULL;
    p= *pp;
    inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
    if (inf & 0x80)
        {
        i=ASN1_R_BAD_OBJECT_HEADER;
        goto err;
        }

    if (tag != V_ASN1_OBJECT)
        {
        i=ASN1_R_EXPECTING_AN_OBJECT;
        goto err;
        }
    ret = c2i_ASN1_OBJECT(a, &p, len);
    if(ret) *pp = p;
    return ret;
err:
    ASN1err(ASN1_F_D2I_ASN1_OBJECT,i);
    return(NULL);
}
ASN1_OBJECT *c2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,
         long len)
    {
    ASN1_OBJECT *ret=NULL;
    const unsigned char *p;
    unsigned char *data;
    int i;
    /* Sanity check OID encoding: can't have leading 0x80 in
     * subidentifiers, see: X.690 8.19.2
     */
    for (i = 0, p = *pp; i < len; i++, p++)
        {
        if (*p == 0x80 && (!i || !(p[-1] & 0x80)))
            {
            ASN1err(ASN1_F_C2I_ASN1_OBJECT,ASN1_R_INVALID_OBJECT_ENCODING);
            return NULL;
            }
        }

    /* only the ASN1_OBJECTs from the 'table' will have values
     * for ->sn or ->ln */
    if ((a == NULL) || ((*a) == NULL) ||
        !((*a)->flags & ASN1_OBJECT_FLAG_DYNAMIC))
        {
        if ((ret=ASN1_OBJECT_new()) == NULL) return(NULL);
        }
    else    ret=(*a);

    p= *pp;
    /* detach data from object */
    data = (unsigned char *)ret->data;
    ret->data = NULL;
    /* once detached we can change it */
    if ((data == NULL) || (ret->length < len))
        {
        ret->length=0;
        if (data != NULL) OPENSSL_free(data);
        data=(unsigned char *)OPENSSL_malloc(len ? (int)len : 1);
        if (data == NULL)
            { i=ERR_R_MALLOC_FAILURE; goto err; }
        ret->flags|=ASN1_OBJECT_FLAG_DYNAMIC_DATA;
        }
    memcpy(data,p,(int)len);
    /* reattach data to object, after which it remains const */
    ret->data  =data;
    ret->length=(int)len;
    ret->sn=NULL;
    ret->ln=NULL;
    /* ret->flags=ASN1_OBJECT_FLAG_DYNAMIC; we know it is dynamic */
    p+=len;

    if (a != NULL) (*a)=ret;
    *pp=p;
    return(ret);
err:
    ASN1err(ASN1_F_C2I_ASN1_OBJECT,i);
    if ((ret != NULL) && ((a == NULL) || (*a != ret)))
        ASN1_OBJECT_free(ret);
    return(NULL);
    }

ASN1_OBJECT *ASN1_OBJECT_new(void)
    {
    ASN1_OBJECT *ret;

    ret=(ASN1_OBJECT *)OPENSSL_malloc(sizeof(ASN1_OBJECT));
    if (ret == NULL)
        {
        ASN1err(ASN1_F_ASN1_OBJECT_NEW,ERR_R_MALLOC_FAILURE);
        return(NULL);
        }
    ret->length=0;
    ret->data=NULL;
    ret->nid=0;
    ret->sn=NULL;
    ret->ln=NULL;
    ret->flags=ASN1_OBJECT_FLAG_DYNAMIC;
    return(ret);
    }

void ASN1_OBJECT_free(ASN1_OBJECT *a)
    {
    if (a == NULL) return;
    if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_STRINGS)
        {
#ifndef CONST_STRICT /* disable purely for compile-time strict const checking. Doing this on a "real" compile will cause memory leaks */
        if (a->sn != NULL) OPENSSL_free((void *)a->sn);
        if (a->ln != NULL) OPENSSL_free((void *)a->ln);
#endif
        a->sn=a->ln=NULL;
        }
    if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_DATA)
        {
        if (a->data != NULL) OPENSSL_free((void *)a->data);
        a->data=NULL;
        a->length=0;
        }
    if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC)
        OPENSSL_free(a);
    }

ASN1_OBJECT *ASN1_OBJECT_create(int nid, unsigned char *data, int len,
         const char *sn, const char *ln)
    {
    ASN1_OBJECT o;

    o.sn=sn;
    o.ln=ln;
    o.data=data;
    o.nid=nid;
    o.length=len;
    o.flags=ASN1_OBJECT_FLAG_DYNAMIC|ASN1_OBJECT_FLAG_DYNAMIC_STRINGS|
        ASN1_OBJECT_FLAG_DYNAMIC_DATA;
    return(OBJ_dup(&o));
    }

IMPLEMENT_STACK_OF(ASN1_OBJECT)
IMPLEMENT_ASN1_SET_OF(ASN1_OBJECT)