/* crypto/asn1/f_int.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/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->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 *)Malloc(
					(unsigned int)num+i*2);
			else
				sp=(unsigned char *)Realloc(s,
					(unsigned int)num+i*2);
			if (sp == NULL)
				{
				ASN1err(ASN1_F_A2I_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
				if (s != NULL) Free((char *)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);
	}