a_bytes.c

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/* crypto/asn1/a_bytes.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 "cryptlib.h"
#include <openssl/asn1.h>

static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c);
/* 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=(unsigned char *)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);
    }

ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp,
         long length, int Ptag, int Pclass)
    {
    ASN1_STRING *ret=NULL;
    const unsigned char *p;
    unsigned char *s;
    long len;
    int inf,tag,xclass;
    int i=0;

    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)
        {
        i=ASN1_R_BAD_OBJECT_HEADER;
        goto err;
        }

    if (tag != Ptag)
        {
        i=ASN1_R_WRONG_TAG;
        goto err;
        }

    if (inf & V_ASN1_CONSTRUCTED)
        {
        ASN1_const_CTX c;

        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)) 
            goto err; 
        else
            {
            p=c.p;
            }
        }
    else
        {
        if (len != 0)
            {
            if ((ret->length < len) || (ret->data == NULL))
                {
                if (ret->data != NULL) OPENSSL_free(ret->data);
                s=(unsigned char *)OPENSSL_malloc((int)len + 1);
                if (s == NULL)
                    {
                    i=ERR_R_MALLOC_FAILURE;
                    goto err;
                    }
                }
            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);
    ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
    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 <[email protected]>, many thanks to him */
static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c)
    {
    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 (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
            == NULL)
            {
            c->error=ERR_R_ASN1_LIB;
            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:
    ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE,c->error);
    if (os != NULL) ASN1_STRING_free(os);
    if (b.data != NULL) OPENSSL_free(b.data);
    return(0);
    }