CSE2410 Fall 2014 Bounce

/* crypto/asn1/evp_asn1.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>

#include <openssl/asn1_mac.h>

int ASN1_TYPE_set_octetstring(ASN1_TYPE *a, unsigned char *data, int len)

        {

        ASN1_STRING *os;

        if ((os=M_ASN1_OCTET_STRING_new()) == NULL) return(0);

        if (!M_ASN1_OCTET_STRING_set(os,data,len))

                {

                M_ASN1_OCTET_STRING_free(os);

                return 0;

                }

        ASN1_TYPE_set(a,V_ASN1_OCTET_STRING,os);

        return(1);

        }

/* int max_len:  for returned value    */

int ASN1_TYPE_get_octetstring(ASN1_TYPE *a, unsigned char *data,

             int max_len)

        {

        int ret,num;

        unsigned char *p;

        if ((a->type != V_ASN1_OCTET_STRING) || (a->value.octet_string == NULL))

                {

                ASN1err(ASN1_F_ASN1_TYPE_GET_OCTETSTRING,ASN1_R_DATA_IS_WRONG);

                return(-1);

                }

        p=M_ASN1_STRING_data(a->value.octet_string);

        ret=M_ASN1_STRING_length(a->value.octet_string);

        if (ret < max_len)

                num=ret;

        else

                num=max_len;

        memcpy(data,p,num);

        return(ret);

        }

int ASN1_TYPE_set_int_octetstring(ASN1_TYPE *a, long num, unsigned char *data,

             int len)

        {

        int n,size;

        ASN1_OCTET_STRING os,*osp;

        ASN1_INTEGER in;

        unsigned char *p;

        unsigned char buf[32]; /* when they have 256bit longs, 

                                * I'll be in trouble */

        in.data=buf;

        in.length=32;

        os.data=data;

        os.type=V_ASN1_OCTET_STRING;

        os.length=len;

        ASN1_INTEGER_set(&in,num);

        n =  i2d_ASN1_INTEGER(&in,NULL);

        n+=M_i2d_ASN1_OCTET_STRING(&os,NULL);

        size=ASN1_object_size(1,n,V_ASN1_SEQUENCE);

        if ((osp=ASN1_STRING_new()) == NULL) return(0);

        /* Grow the 'string' */

        if (!ASN1_STRING_set(osp,NULL,size))

                {

                ASN1_STRING_free(osp);

                return(0);

                }

        M_ASN1_STRING_length_set(osp, size);

        p=M_ASN1_STRING_data(osp);

        ASN1_put_object(&p,1,n,V_ASN1_SEQUENCE,V_ASN1_UNIVERSAL);

          i2d_ASN1_INTEGER(&in,&p);

        M_i2d_ASN1_OCTET_STRING(&os,&p);

        ASN1_TYPE_set(a,V_ASN1_SEQUENCE,osp);

        return(1);

        }

/* we return the actual length..., num may be missing, in which

 * case, set it to zero */

/* int max_len:  for returned value    */

int ASN1_TYPE_get_int_octetstring(ASN1_TYPE *a, long *num, unsigned char *data,

             int max_len)

        {

        int ret= -1,n;

        ASN1_INTEGER *ai=NULL;

        ASN1_OCTET_STRING *os=NULL;

        const unsigned char *p;

        long length;

        ASN1_const_CTX c;

        if ((a->type != V_ASN1_SEQUENCE) || (a->value.sequence == NULL))

                {

                goto err;

                }

        p=M_ASN1_STRING_data(a->value.sequence);

        length=M_ASN1_STRING_length(a->value.sequence);

        c.pp= &p;

        c.p=p;

        c.max=p+length;

        c.error=ASN1_R_DATA_IS_WRONG;

        M_ASN1_D2I_start_sequence();

        c.q=c.p;

        if ((ai=d2i_ASN1_INTEGER(NULL,&c.p,c.slen)) == NULL) goto err;

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

        c.q=c.p;

        if ((os=d2i_ASN1_OCTET_STRING(NULL,&c.p,c.slen)) == NULL) goto err;

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

        if (!M_ASN1_D2I_end_sequence()) goto err;

        if (num != NULL)

                *num=ASN1_INTEGER_get(ai);

        ret=M_ASN1_STRING_length(os);

        if (max_len > ret)

                n=ret;

        else

                n=max_len;

        if (data != NULL)

                memcpy(data,M_ASN1_STRING_data(os),n);

        if (0)

                {

err:

                ASN1err(ASN1_F_ASN1_TYPE_GET_INT_OCTETSTRING,ASN1_R_DATA_IS_WRONG);

                }

        if (os != NULL) M_ASN1_OCTET_STRING_free(os);

        if (ai != NULL) M_ASN1_INTEGER_free(ai);

        return(ret);

        }