f_int.c

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/* crypto/asn1/f_int.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/buffer.h>
#include <openssl/asn1.h>

int i2a_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *a)
    {
    int i,n=0;
    static const char *h="0123456789ABCDEF";
    char buf[2];

    if (a == NULL) return(0);

    if (a->type & V_ASN1_NEG)
        {
        if (BIO_write(bp, "-", 1) != 1) goto err;
        n = 1;
        }

    if (a->length == 0)
        {
        if (BIO_write(bp,"00",2) != 2) goto err;
        n += 2;
        }
    else
        {
        for (i=0; i<a->length; i++)
            {
            if ((i != 0) && (i%35 == 0))
                {
                if (BIO_write(bp,"\\\n",2) != 2) goto err;
                n+=2;
                }
            buf[0]=h[((unsigned char)a->data[i]>>4)&0x0f];
            buf[1]=h[((unsigned char)a->data[i]   )&0x0f];
            if (BIO_write(bp,buf,2) != 2) goto err;
            n+=2;
            }
        }
    return(n);
err:
    return(-1);
    }

int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
    {
    int ret=0;
    int i,j,k,m,n,again,bufsize;
    unsigned char *s=NULL,*sp;
    unsigned char *bufp;
    int num=0,slen=0,first=1;

    bs->type=V_ASN1_INTEGER;

    bufsize=BIO_gets(bp,buf,size);
    for (;;)
        {
        if (bufsize < 1) goto err_sl;
        i=bufsize;
        if (buf[i-1] == '\n') buf[--i]='\0';
        if (i == 0) goto err_sl;
        if (buf[i-1] == '\r') buf[--i]='\0';
        if (i == 0) goto err_sl;
        again=(buf[i-1] == '\\');

        for (j=0; j<i; j++)
            {
#ifndef CHARSET_EBCDIC
            if (!(  ((buf[j] >= '0') && (buf[j] <= '9')) ||
                ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
                ((buf[j] >= 'A') && (buf[j] <= 'F'))))
#else
            /* This #ifdef is not strictly necessary, since
             * the characters A...F a...f 0...9 are contiguous
             * (yes, even in EBCDIC - but not the whole alphabet).
             * Nevertheless, isxdigit() is faster.
             */
            if (!isxdigit(buf[j]))
#endif
                {
                i=j;
                break;
                }
            }
        buf[i]='\0';
        /* We have now cleared all the crap off the end of the
         * line */
        if (i < 2) goto err_sl;

        bufp=(unsigned char *)buf;
        if (first)
            {
            first=0;
            if ((bufp[0] == '0') && (buf[1] == '0'))
                {
                bufp+=2;
                i-=2;
                }
            }
        k=0;
        i-=again;
        if (i%2 != 0)
            {
            ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_ODD_NUMBER_OF_CHARS);
            goto err;
            }
        i/=2;
        if (num+i > slen)
            {
            if (s == NULL)
                sp=(unsigned char *)OPENSSL_malloc(
                    (unsigned int)num+i*2);
            else
                sp=OPENSSL_realloc_clean(s,slen,num+i*2);
            if (sp == NULL)
                {
                ASN1err(ASN1_F_A2I_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
                if (s != NULL) OPENSSL_free(s);
                goto err;
                }
            s=sp;
            slen=num+i*2;
            }
        for (j=0; j<i; j++,k+=2)
            {
            for (n=0; n<2; n++)
                {
                m=bufp[k+n];
                if ((m >= '0') && (m <= '9'))
                    m-='0';
                else if ((m >= 'a') && (m <= 'f'))
                    m=m-'a'+10;
                else if ((m >= 'A') && (m <= 'F'))
                    m=m-'A'+10;
                else
                    {
                    ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_NON_HEX_CHARACTERS);
                    goto err;
                    }
                s[num+j]<<=4;
                s[num+j]|=m;
                }
            }
        num+=i;
        if (again)
            bufsize=BIO_gets(bp,buf,size);
        else
            break;
        }
    bs->length=num;
    bs->data=s;
    ret=1;
err:
    if (0)
        {
err_sl:
        ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_SHORT_LINE);
        }
    return(ret);
    }