/* crypto/bn/bn_print.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.]

 */

/*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#include <stdio.h>

#include <ctype.h>

#include "cryptlib.h"

#include <openssl/buffer.h>

#include "bn_lcl.h"

#if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

#ifndef EMULATOR

static const char Hex[]="0123456789ABCDEF";

#else

static const char *const Hex="0123456789ABCDEF";

#endif

/* Must 'OPENSSL_free' the returned data */

EXPORT_C char *BN_bn2hex(const BIGNUM *a)

	{

	int i,j,v,z=0;

	char *buf;

	char *p;

	buf=(char *)OPENSSL_malloc(a->top*BN_BYTES*2+2);

	if (buf == NULL)

		{

		BNerr(BN_F_BN_BN2HEX,ERR_R_MALLOC_FAILURE);

		goto err;

		}

	p=buf;

	if (a->neg) *(p++)='-';

	if (BN_is_zero(a)) *(p++)='0';

	for (i=a->top-1; i >=0; i--)

		{

		for (j=BN_BITS2-8; j >= 0; j-=8)

			{

			/* strip leading zeros */

			v=((int)(a->d[i]>>(long)j))&0xff;

			if (z || (v != 0))

				{

				*(p++)=Hex[v>>4];

				*(p++)=Hex[v&0x0f];

				z=1;

				}

			}

		}

	*p='\0';

err:

	return(buf);

	}

/* Must 'OPENSSL_free' the returned data */

EXPORT_C char *BN_bn2dec(const BIGNUM *a)

	{

	int i=0,num, ok = 0;

	char *buf=NULL;

	char *p;

	BIGNUM *t=NULL;

	BN_ULONG *bn_data=NULL,*lp;

	/* get an upper bound for the length of the decimal integer

	 * num <= (BN_num_bits(a) + 1) * log(2)

	 *     <= 3 * BN_num_bits(a) * 0.1001 + log(2) + 1     (rounding error)

	 *     <= BN_num_bits(a)/10 + BN_num_bits/1000 + 1 + 1 

	 */

	i=BN_num_bits(a)*3;

	num=(i/10+i/1000+1)+1;

	bn_data=(BN_ULONG *)OPENSSL_malloc((num/BN_DEC_NUM+1)*sizeof(BN_ULONG));

	buf=(char *)OPENSSL_malloc(num+3);

	if ((buf == NULL) || (bn_data == NULL))

		{

		BNerr(BN_F_BN_BN2DEC,ERR_R_MALLOC_FAILURE);

		goto err;

		}

	if ((t=BN_dup(a)) == NULL) goto err;

#define BUF_REMAIN (num+3 - (size_t)(p - buf))

	p=buf;

	lp=bn_data;

	if (BN_is_zero(t))

		{

		*(p++)='0';

		*(p++)='\0';

		}

	else

		{

		if (BN_is_negative(t))

			*p++ = '-';

		i=0;

		while (!BN_is_zero(t))

			{

			*lp=BN_div_word(t,BN_DEC_CONV);

			lp++;

			}

		lp--;

		/* We now have a series of blocks, BN_DEC_NUM chars

		 * in length, where the last one needs truncation.

		 * The blocks need to be reversed in order. */

		BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT1,*lp);

		while (*p) p++;

		while (lp != bn_data)

			{

			lp--;

			BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT2,*lp);

			while (*p) p++;

			}

		}

	ok = 1;

err:

	if (bn_data != NULL) OPENSSL_free(bn_data);

	if (t != NULL) BN_free(t);

	if (!ok && buf)

		{

		OPENSSL_free(buf);

		buf = NULL;

		}

	return(buf);

	}

EXPORT_C int BN_hex2bn(BIGNUM **bn, const char *a)

	{

	BIGNUM *ret=NULL;

	BN_ULONG l=0;

	int neg=0,h,m,i,j,k,c;

	int num;

	if ((a == NULL) || (*a == '\0')) return(0);

	if (*a == '-') { neg=1; a++; }

	for (i=0; isxdigit((unsigned char) a[i]); i++)

		;

	num=i+neg;

	if (bn == NULL) return(num);

	/* a is the start of the hex digits, and it is 'i' long */

	if (*bn == NULL)

		{

		if ((ret=BN_new()) == NULL) return(0);

		}

	else

		{

		ret= *bn;

		BN_zero(ret);

		}

	/* i is the number of hex digests; */

	if (bn_expand(ret,i*4) == NULL) goto err;

	j=i; /* least significant 'hex' */

	m=0;

	h=0;

	while (j > 0)

		{

		m=((BN_BYTES*2) <= j)?(BN_BYTES*2):j;

		l=0;

		for (;;)

			{

			c=a[j-m];

			if ((c >= '0') && (c <= '9')) k=c-'0';

			else if ((c >= 'a') && (c <= 'f')) k=c-'a'+10;

			else if ((c >= 'A') && (c <= 'F')) k=c-'A'+10;

			else k=0; /* paranoia */

			l=(l<<4)|k;

			if (--m <= 0)

				{

				ret->d[h++]=l;

				break;

				}

			}

		j-=(BN_BYTES*2);

		}

	ret->top=h;

	bn_correct_top(ret);

	ret->neg=neg;

	*bn=ret;

	bn_check_top(ret);

	return(num);

err:

	if (*bn == NULL) BN_free(ret);

	return(0);

	}

EXPORT_C int BN_dec2bn(BIGNUM **bn, const char *a)

	{

	BIGNUM *ret=NULL;

	BN_ULONG l=0;

	int neg=0,i,j;

	int num;

	if ((a == NULL) || (*a == '\0')) return(0);

	if (*a == '-') { neg=1; a++; }

	for (i=0; isdigit((unsigned char) a[i]); i++)

		;

	num=i+neg;

	if (bn == NULL) return(num);

	/* a is the start of the digits, and it is 'i' long.

	 * We chop it into BN_DEC_NUM digits at a time */

	if (*bn == NULL)

		{

		if ((ret=BN_new()) == NULL) return(0);

		}

	else

		{

		ret= *bn;

		BN_zero(ret);

		}

	/* i is the number of digests, a bit of an over expand; */

	if (bn_expand(ret,i*4) == NULL) goto err;

	j=BN_DEC_NUM-(i%BN_DEC_NUM);

	if (j == BN_DEC_NUM) j=0;

	l=0;

	while (*a)

		{

		l*=10;

		l+= *a-'0';

		a++;

		if (++j == BN_DEC_NUM)

			{

			BN_mul_word(ret,BN_DEC_CONV);

			BN_add_word(ret,l);

			l=0;

			j=0;

			}

		}

	ret->neg=neg;

	bn_correct_top(ret);

	*bn=ret;

	bn_check_top(ret);

	return(num);

err:

	if (*bn == NULL) BN_free(ret);

	return(0);

	}

#ifndef OPENSSL_NO_BIO

#ifndef OPENSSL_NO_FP_API

EXPORT_C int BN_print_fp(FILE *fp, const BIGNUM *a)

	{

	BIO *b;

	int ret;

	if ((b=BIO_new(BIO_s_file())) == NULL)

		return(0);

	BIO_set_fp(b,fp,BIO_NOCLOSE);

	ret=BN_print(b,a);

	BIO_free(b);

	return(ret);

	}

#endif

EXPORT_C int BN_print(BIO *bp, const BIGNUM *a)

	{

	int i,j,v,z=0;

	int ret=0;

	if ((a->neg) && (BIO_write(bp,"-",1) != 1)) goto end;

	if (BN_is_zero(a) && (BIO_write(bp,"0",1) != 1)) goto end;

	for (i=a->top-1; i >=0; i--)

		{

		for (j=BN_BITS2-4; j >= 0; j-=4)

			{

			/* strip leading zeros */

			v=((int)(a->d[i]>>(long)j))&0x0f;

			if (z || (v != 0))

				{

				if (BIO_write(bp,&(Hex[v]),1) != 1)

					goto end;

				z=1;

				}

			}

		}

	ret=1;

end:

	return(ret);

	}

#endif