asn1_lib.c

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/* crypto/asn1/asn1_lib.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/asn1.h>
#include <openssl/asn1_mac.h>

static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max);
static void asn1_put_length(unsigned char **pp, int length);
const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT;

static int _asn1_check_infinite_end(const unsigned char **p, long len)
    {
    /* If there is 0 or 1 byte left, the length check should pick
     * things up */
    if (len <= 0)
        return(1);
    else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
        {
        (*p)+=2;
        return(1);
        }
    return(0);
    }

int ASN1_check_infinite_end(unsigned char **p, long len)
    {
    return _asn1_check_infinite_end((const unsigned char **)p, len);
    }

int ASN1_const_check_infinite_end(const unsigned char **p, long len)
    {
    return _asn1_check_infinite_end(p, len);
    }


int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
    int *pclass, long omax)
    {
    int i,ret;
    long l;
    const unsigned char *p= *pp;
    int tag,xclass,inf;
    long max=omax;

    if (!max) goto err;
    ret=(*p&V_ASN1_CONSTRUCTED);
    xclass=(*p&V_ASN1_PRIVATE);
    i= *p&V_ASN1_PRIMITIVE_TAG;
    if (i == V_ASN1_PRIMITIVE_TAG)
        {       /* high-tag */
        p++;
        if (--max == 0) goto err;
        l=0;
        while (*p&0x80)
            {
            l<<=7L;
            l|= *(p++)&0x7f;
            if (--max == 0) goto err;
            if (l > (INT_MAX >> 7L)) goto err;
            }
        l<<=7L;
        l|= *(p++)&0x7f;
        tag=(int)l;
        if (--max == 0) goto err;
        }
    else
        { 
        tag=i;
        p++;
        if (--max == 0) goto err;
        }
    *ptag=tag;
    *pclass=xclass;
    if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;

#if 0
    fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n", 
        (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
        (int)(omax+ *pp));

#endif
    if (*plength > (omax - (p - *pp)))
        {
        ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
        /* Set this so that even if things are not long enough
         * the values are set correctly */
        ret|=0x80;
        }
    *pp=p;
    return(ret|inf);
err:
    ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
    return(0x80);
    }

static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)
    {
    const unsigned char *p= *pp;
    unsigned long ret=0;
    unsigned int i;

    if (max-- < 1) return(0);
    if (*p == 0x80)
        {
        *inf=1;
        ret=0;
        p++;
        }
    else
        {
        *inf=0;
        i= *p&0x7f;
        if (*(p++) & 0x80)
            {
            if (i > sizeof(long))
                return 0;
            if (max-- == 0) return(0);
            while (i-- > 0)
                {
                ret<<=8L;
                ret|= *(p++);
                if (max-- == 0) return(0);
                }
            }
        else
            ret=i;
        }
    if (ret > LONG_MAX)
        return 0;
    *pp=p;
    *rl=(long)ret;
    return(1);
    }

/* class 0 is constructed
 * constructed == 2 for indefinite length constructed */
void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
         int xclass)
    {
    unsigned char *p= *pp;
    int i, ttag;

    i=(constructed)?V_ASN1_CONSTRUCTED:0;
    i|=(xclass&V_ASN1_PRIVATE);
    if (tag < 31)
        *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
    else
        {
        *(p++)=i|V_ASN1_PRIMITIVE_TAG;
        for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
        ttag = i;
        while(i-- > 0)
            {
            p[i] = tag & 0x7f;
            if(i != (ttag - 1)) p[i] |= 0x80;
            tag >>= 7;
            }
        p += ttag;
        }
    if (constructed == 2)
        *(p++)=0x80;
    else
        asn1_put_length(&p,length);
    *pp=p;
    }

int ASN1_put_eoc(unsigned char **pp)
    {
    unsigned char *p = *pp;
    *p++ = 0;
    *p++ = 0;
    *pp = p;
    return 2;
    }

static void asn1_put_length(unsigned char **pp, int length)
    {
    unsigned char *p= *pp;
    int i,l;
    if (length <= 127)
        *(p++)=(unsigned char)length;
    else
        {
        l=length;
        for (i=0; l > 0; i++)
            l>>=8;
        *(p++)=i|0x80;
        l=i;
        while (i-- > 0)
            {
            p[i]=length&0xff;
            length>>=8;
            }
        p+=l;
        }
    *pp=p;
    }

int ASN1_object_size(int constructed, int length, int tag)
    {
    int ret;

    ret=length;
    ret++;
    if (tag >= 31)
        {
        while (tag > 0)
            {
            tag>>=7;
            ret++;
            }
        }
    if (constructed == 2)
        return ret + 3;
    ret++;
    if (length > 127)
        {
        while (length > 0)
            {
            length>>=8;
            ret++;
            }
        }
    return(ret);
    }

static int _asn1_Finish(ASN1_const_CTX *c)
    {
    if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
        {
        if (!ASN1_const_check_infinite_end(&c->p,c->slen))
            {
            c->error=ERR_R_MISSING_ASN1_EOS;
            return(0);
            }
        }
    if (    ((c->slen != 0) && !(c->inf & 1)) ||
        ((c->slen < 0) && (c->inf & 1)))
        {
        c->error=ERR_R_ASN1_LENGTH_MISMATCH;
        return(0);
        }
    return(1);
    }

int asn1_Finish(ASN1_CTX *c)
    {
    return _asn1_Finish((ASN1_const_CTX *)c);
    }

int asn1_const_Finish(ASN1_const_CTX *c)
    {
    return _asn1_Finish(c);
    }

int asn1_GetSequence(ASN1_const_CTX *c, long *length)
    {
    const unsigned char *q;

    q=c->p;
    c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
        *length);
    if (c->inf & 0x80)
        {
        c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
        return(0);
        }
    if (c->tag != V_ASN1_SEQUENCE)
        {
        c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
        return(0);
        }
    (*length)-=(c->p-q);
    if (c->max && (*length < 0))
        {
        c->error=ERR_R_ASN1_LENGTH_MISMATCH;
        return(0);
        }
    if (c->inf == (1|V_ASN1_CONSTRUCTED))
        c->slen= *length+ *(c->pp)-c->p;
    c->eos=0;
    return(1);
    }

int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
    {
    if (str == NULL)
        return 0;
    dst->type = str->type;
    if (!ASN1_STRING_set(dst,str->data,str->length))
        return 0;
    dst->flags = str->flags;
    return 1;
    }

ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
    {
    ASN1_STRING *ret;
    if (!str)
         return NULL;
    ret=ASN1_STRING_new();
    if (!ret)
        return NULL;
    if (!ASN1_STRING_copy(ret,str))
        {
        ASN1_STRING_free(ret);
        return NULL;
        }
    return ret;
    }

int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
    {
    unsigned char *c;
    const char *data=_data;

    if (len < 0)
        {
        if (data == NULL)
            return(0);
        else
            len=strlen(data);
        }
    if ((str->length < len) || (str->data == NULL))
        {
        c=str->data;
        if (c == NULL)
            str->data=OPENSSL_malloc(len+1);
        else
            str->data=OPENSSL_realloc(c,len+1);

        if (str->data == NULL)
            {
            ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
            str->data=c;
            return(0);
            }
        }
    str->length=len;
    if (data != NULL)
        {
        memcpy(str->data,data,len);
        /* an allowance for strings :-) */
        str->data[len]='\0';
        }
    return(1);
    }

void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
    {
    if (str->data)
        OPENSSL_free(str->data);
    str->data = data;
    str->length = len;
    }

ASN1_STRING *ASN1_STRING_new(void)
    {
    return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
    }


ASN1_STRING *ASN1_STRING_type_new(int type)
    {
    ASN1_STRING *ret;

    ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
    if (ret == NULL)
        {
        ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
        return(NULL);
        }
    ret->length=0;
    ret->type=type;
    ret->data=NULL;
    ret->flags=0;
    return(ret);
    }

void ASN1_STRING_free(ASN1_STRING *a)
    {
    if (a == NULL) return;
    if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
        OPENSSL_free(a->data);
    OPENSSL_free(a);
    }

int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
    {
    int i;

    i=(a->length-b->length);
    if (i == 0)
        {
        i=memcmp(a->data,b->data,a->length);
        if (i == 0)
            return(a->type-b->type);
        else
            return(i);
        }
    else
        return(i);
    }

void asn1_add_error(const unsigned char *address, int offset)
    {
    char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];

    BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
    BIO_snprintf(buf2,sizeof buf2,"%d",offset);
    ERR_add_error_data(4,"address=",buf1," offset=",buf2);
    }

int ASN1_STRING_length(const ASN1_STRING *x)
{ return M_ASN1_STRING_length(x); }

void ASN1_STRING_length_set(ASN1_STRING *x, int len)
{ M_ASN1_STRING_length_set(x, len); return; }

int ASN1_STRING_type(ASN1_STRING *x)
{ return M_ASN1_STRING_type(x); }

unsigned char * ASN1_STRING_data(ASN1_STRING *x)
{ return M_ASN1_STRING_data(x); }