/* 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