crypto/bn/bn_print.c - platform/external/openssl - Git at Google

 /* 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.]
  */

 #include <stdio.h>
 #include <ctype.h>
 #include "cryptlib.h"
 #include <openssl/buffer.h>
 #include "bn_lcl.h"

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

 /* Must 'OPENSSL_free' the returned data */
 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 */
 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);
 	}

 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);
 	}

 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);
 	}

 int BN_asc2bn(BIGNUM **bn, const char *a)
 	{
 	const char *p = a;
 	if (*p == '-')
 		p++;

 	if (p[0] == '0' && (p[1] == 'X' || p[1] == 'x'))
 		{
 		if (!BN_hex2bn(bn, p + 2))
 			return 0;
 		}
 	else
 		{
 		if (!BN_dec2bn(bn, p))
 			return 0;
 		}
 	if (*a == '-')
 		(*bn)->neg = 1;
 	return 1;
 	}

 #ifndef OPENSSL_NO_BIO
 #ifndef OPENSSL_NO_FP_API
 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

 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
	/* 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.]
	*/

	#include <stdio.h>
	#include <ctype.h>
	#include "cryptlib.h"
	#include <openssl/buffer.h>
	#include "bn_lcl.h"

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

	/* Must 'OPENSSL_free' the returned data */
	char BN_bn2hex(const BIGNUM a)
	{
	int i,j,v,z=0;
	char *buf;
	char *p;

	buf=(char )OPENSSL_malloc(a->topBN_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 */
	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);
	}

	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_BYTES2) <= j)?(BN_BYTES2):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);
	}

	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);
	}

	int BN_asc2bn(BIGNUM *bn, const char a)
	{
	const char *p = a;
	if (*p == '-')
	p++;

	if (p[0] == '0' && (p[1] == 'X' \|\| p[1] == 'x'))
	{
	if (!BN_hex2bn(bn, p + 2))
	return 0;
	}
	else
	{
	if (!BN_dec2bn(bn, p))
	return 0;
	}
	if (*a == '-')
	(*bn)->neg = 1;
	return 1;
	}

	#ifndef OPENSSL_NO_BIO
	#ifndef OPENSSL_NO_FP_API
	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

	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