crypto/asn1/a_int.c - boringssl - Git at Google

 /* 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 <openssl/asn1.h>

 #include <openssl/err.h>
 #include <openssl/mem.h>


 ASN1_INTEGER *ASN1_INTEGER_dup(const ASN1_INTEGER *x)
 { return M_ASN1_INTEGER_dup(x);}

 int ASN1_INTEGER_cmp(const ASN1_INTEGER *x, const ASN1_INTEGER *y)
 	{
 	int neg, ret;
 	/* Compare signs */
 	neg = x->type & V_ASN1_NEG;
 	if (neg != (y->type & V_ASN1_NEG))
 		{
 		if (neg)
 			return -1;
 		else
 			return 1;
 		}

 	ret = ASN1_STRING_cmp(x, y);

 	if (neg)
 		return -ret;
 	else
 		return ret;
 	}


 /*
  * This converts an ASN1 INTEGER into its content encoding.
  * The internal representation is an ASN1_STRING whose data is a big endian
  * representation of the value, ignoring the sign. The sign is determined by
  * the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative.
  *
  * Positive integers are no problem: they are almost the same as the DER
  * encoding, except if the first byte is >= 0x80 we need to add a zero pad.
  *
  * Negative integers are a bit trickier...
  * The DER representation of negative integers is in 2s complement form.
  * The internal form is converted by complementing each octet and finally
  * adding one to the result. This can be done less messily with a little trick.
  * If the internal form has trailing zeroes then they will become FF by the
  * complement and 0 by the add one (due to carry) so just copy as many trailing
  * zeros to the destination as there are in the source. The carry will add one
  * to the last none zero octet: so complement this octet and add one and finally
  * complement any left over until you get to the start of the string.
  *
  * Padding is a little trickier too. If the first bytes is > 0x80 then we pad
  * with 0xff. However if the first byte is 0x80 and one of the following bytes
  * is non-zero we pad with 0xff. The reason for this distinction is that 0x80
  * followed by optional zeros isn't padded.
  */

 int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
 	{
 	int pad=0,ret,i,neg;
 	unsigned char *p,*n,pb=0;

 	if (a == NULL) return(0);
 	neg=a->type & V_ASN1_NEG;
 	if (a->length == 0)
 		ret=1;
 	else
 		{
 		ret=a->length;
 		i=a->data[0];
 		if (!neg && (i > 127)) {
 			pad=1;
 			pb=0;
 		} else if(neg) {
 			if(i>128) {
 				pad=1;
 				pb=0xFF;
 			} else if(i == 128) {
 			/*
 			 * Special case: if any other bytes non zero we pad:
 			 * otherwise we don't.
 			 */
 				for(i = 1; i < a->length; i++) if(a->data[i]) {
 						pad=1;
 						pb=0xFF;
 						break;
 				}
 			}
 		}
 		ret+=pad;
 		}
 	if (pp == NULL) return(ret);
 	p= *pp;

 	if (pad) *(p++)=pb;
 	if (a->length == 0) *(p++)=0;
 	else if (!neg) memcpy(p,a->data,(unsigned int)a->length);
 	else {
 		/* Begin at the end of the encoding */
 		n=a->data + a->length - 1;
 		p += a->length - 1;
 		i = a->length;
 		/* Copy zeros to destination as long as source is zero */
 		while(!*n) {
 			*(p--) = 0;
 			n--;
 			i--;
 		}
 		/* Complement and increment next octet */
 		*(p--) = ((*(n--)) ^ 0xff) + 1;
 		i--;
 		/* Complement any octets left */
 		for(;i > 0; i--) *(p--) = *(n--) ^ 0xff;
 	}

 	*pp+=ret;
 	return(ret);
 	}

 /* Convert just ASN1 INTEGER content octets to ASN1_INTEGER structure */

 ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **pp,
 	     long len)
 	{
 	ASN1_INTEGER *ret=NULL;
 	const unsigned char *p, *pend;
 	unsigned char *to,*s;
 	int i;

 	if ((a == NULL) || ((*a) == NULL))
 		{
 		if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
 		ret->type=V_ASN1_INTEGER;
 		}
 	else
 		ret=(*a);

 	p= *pp;
 	pend = p + len;

 	/* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
 	 * signifies a missing NULL parameter. */
 	s=(unsigned char *)OPENSSL_malloc((int)len+1);
 	if (s == NULL)
 		{
 		i=ERR_R_MALLOC_FAILURE;
 		goto err;
 		}
 	to=s;
 	if(!len) {
 		/* Strictly speaking this is an illegal INTEGER but we
 		 * tolerate it.
 		 */
 		ret->type=V_ASN1_INTEGER;
 	} else if (*p & 0x80) /* a negative number */
 		{
 		ret->type=V_ASN1_NEG_INTEGER;
 		if ((*p == 0xff) && (len != 1)) {
 			p++;
 			len--;
 		}
 		i = len;
 		p += i - 1;
 		to += i - 1;
 		while((!*p) && i) {
 			*(to--) = 0;
 			i--;
 			p--;
 		}
 		/* Special case: if all zeros then the number will be of
 		 * the form FF followed by n zero bytes: this corresponds to
 		 * 1 followed by n zero bytes. We've already written n zeros
 		 * so we just append an extra one and set the first byte to
 		 * a 1. This is treated separately because it is the only case
 		 * where the number of bytes is larger than len.
 		 */
 		if(!i) {
 			*s = 1;
 			s[len] = 0;
 			len++;
 		} else {
 			*(to--) = (*(p--) ^ 0xff) + 1;
 			i--;
 			for(;i > 0; i--) *(to--) = *(p--) ^ 0xff;
 		}
 	} else {
 		ret->type=V_ASN1_INTEGER;
 		if ((*p == 0) && (len != 1))
 			{
 			p++;
 			len--;
 			}
 		memcpy(s,p,(int)len);
 	}

 	if (ret->data != NULL) OPENSSL_free(ret->data);
 	ret->data=s;
 	ret->length=(int)len;
 	if (a != NULL) (*a)=ret;
 	*pp=pend;
 	return(ret);
 err:
 	OPENSSL_PUT_ERROR(ASN1, c2i_ASN1_INTEGER, i);
 	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 		M_ASN1_INTEGER_free(ret);
 	return(NULL);
 	}


 /* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
  * ASN1 integers: some broken software can encode a positive INTEGER
  * with its MSB set as negative (it doesn't add a padding zero).
  */

 ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp,
 	     long length)
 	{
 	ASN1_INTEGER *ret=NULL;
 	const unsigned char *p;
 	unsigned char *s;
 	long len;
 	int inf,tag,xclass;
 	int i;

 	if ((a == NULL) || ((*a) == NULL))
 		{
 		if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
 		ret->type=V_ASN1_INTEGER;
 		}
 	else
 		ret=(*a);

 	p= *pp;
 	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 	if (inf & 0x80)
 		{
 		i=ASN1_R_BAD_OBJECT_HEADER;
 		goto err;
 		}

 	if (tag != V_ASN1_INTEGER)
 		{
 		i=ASN1_R_EXPECTING_AN_INTEGER;
 		goto err;
 		}

 	/* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
 	 * signifies a missing NULL parameter. */
 	s=(unsigned char *)OPENSSL_malloc((int)len+1);
 	if (s == NULL)
 		{
 		i=ERR_R_MALLOC_FAILURE;
 		goto err;
 		}
 	ret->type=V_ASN1_INTEGER;
 	if(len) {
 		if ((*p == 0) && (len != 1))
 			{
 			p++;
 			len--;
 			}
 		memcpy(s,p,(int)len);
 		p+=len;
 	}

 	if (ret->data != NULL) OPENSSL_free(ret->data);
 	ret->data=s;
 	ret->length=(int)len;
 	if (a != NULL) (*a)=ret;
 	*pp=p;
 	return(ret);
 err:
 	OPENSSL_PUT_ERROR(ASN1, d2i_ASN1_UINTEGER, i);
 	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 		M_ASN1_INTEGER_free(ret);
 	return(NULL);
 	}

 int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
 	{
 	int j,k;
 	unsigned int i;
 	unsigned char buf[sizeof(long)+1];
 	long d;

 	a->type=V_ASN1_INTEGER;
 	if (a->length < (int)(sizeof(long)+1))
 		{
 		if (a->data != NULL)
 			OPENSSL_free(a->data);
 		if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL)
 			memset((char *)a->data,0,sizeof(long)+1);
 		}
 	if (a->data == NULL)
 		{
 		OPENSSL_PUT_ERROR(ASN1, ASN1_INTEGER_set, ERR_R_MALLOC_FAILURE);
 		return(0);
 		}
 	d=v;
 	if (d < 0)
 		{
 		d= -d;
 		a->type=V_ASN1_NEG_INTEGER;
 		}

 	for (i=0; i<sizeof(long); i++)
 		{
 		if (d == 0) break;
 		buf[i]=(int)d&0xff;
 		d>>=8;
 		}
 	j=0;
 	for (k=i-1; k >=0; k--)
 		a->data[j++]=buf[k];
 	a->length=j;
 	return(1);
 	}

 long ASN1_INTEGER_get(const ASN1_INTEGER *a)
 	{
 	int neg=0,i;
 	long r=0;

 	if (a == NULL) return(0L);
 	i=a->type;
 	if (i == V_ASN1_NEG_INTEGER)
 		neg=1;
 	else if (i != V_ASN1_INTEGER)
 		return -1;

 	if (a->length > (int)sizeof(long))
 		{
 		/* hmm... a bit ugly, return all ones */
 		return -1;
 		}
 	if (a->data == NULL)
 		return 0;

 	for (i=0; i<a->length; i++)
 		{
 		r<<=8;
 		r|=(unsigned char)a->data[i];
 		}
 	if (neg) r= -r;
 	return(r);
 	}

 ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai)
 	{
 	ASN1_INTEGER *ret;
 	int len,j;

 	if (ai == NULL)
 		ret=M_ASN1_INTEGER_new();
 	else
 		ret=ai;
 	if (ret == NULL)
 		{
 		OPENSSL_PUT_ERROR(ASN1, BN_to_ASN1_INTEGER, ASN1_R_NESTED_ASN1_ERROR);
 		goto err;
 		}
 	if (BN_is_negative(bn))
 		ret->type = V_ASN1_NEG_INTEGER;
 	else ret->type=V_ASN1_INTEGER;
 	j=BN_num_bits(bn);
 	len=((j == 0)?0:((j/8)+1));
 	if (ret->length < len+4)
 		{
 		unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);
 		if (!new_data)
 			{
 			OPENSSL_PUT_ERROR(ASN1, BN_to_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
 			goto err;
 			}
 		ret->data=new_data;
 		}
 	ret->length=BN_bn2bin(bn,ret->data);
 	/* Correct zero case */
 	if(!ret->length)
 		{
 		ret->data[0] = 0;
 		ret->length = 1;
 		}
 	return(ret);
 err:
 	if (ret != ai) M_ASN1_INTEGER_free(ret);
 	return(NULL);
 	}

 BIGNUM *ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn)
 	{
 	BIGNUM *ret;

 	if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
 		OPENSSL_PUT_ERROR(ASN1, ASN1_INTEGER_to_BN, ASN1_R_BN_LIB);
 	else if(ai->type == V_ASN1_NEG_INTEGER)
 		BN_set_negative(ret, 1);
 	return(ret);
 	}
	/* 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 <openssl/asn1.h>

	#include <openssl/err.h>
	#include <openssl/mem.h>


	ASN1_INTEGER ASN1_INTEGER_dup(const ASN1_INTEGER x)
	{ return M_ASN1_INTEGER_dup(x);}

	int ASN1_INTEGER_cmp(const ASN1_INTEGER x, const ASN1_INTEGER y)
	{
	int neg, ret;
	/* Compare signs */
	neg = x->type & V_ASN1_NEG;
	if (neg != (y->type & V_ASN1_NEG))
	{
	if (neg)
	return -1;
	else
	return 1;
	}

	ret = ASN1_STRING_cmp(x, y);

	if (neg)
	return -ret;
	else
	return ret;
	}


	/*
	* This converts an ASN1 INTEGER into its content encoding.
	* The internal representation is an ASN1_STRING whose data is a big endian
	* representation of the value, ignoring the sign. The sign is determined by
	* the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative.
	*
	* Positive integers are no problem: they are almost the same as the DER
	* encoding, except if the first byte is >= 0x80 we need to add a zero pad.
	*
	* Negative integers are a bit trickier...
	* The DER representation of negative integers is in 2s complement form.
	* The internal form is converted by complementing each octet and finally
	* adding one to the result. This can be done less messily with a little trick.
	* If the internal form has trailing zeroes then they will become FF by the
	* complement and 0 by the add one (due to carry) so just copy as many trailing
	* zeros to the destination as there are in the source. The carry will add one
	* to the last none zero octet: so complement this octet and add one and finally
	* complement any left over until you get to the start of the string.
	*
	* Padding is a little trickier too. If the first bytes is > 0x80 then we pad
	* with 0xff. However if the first byte is 0x80 and one of the following bytes
	* is non-zero we pad with 0xff. The reason for this distinction is that 0x80
	* followed by optional zeros isn't padded.
	*/

	int i2c_ASN1_INTEGER(ASN1_INTEGER a, unsigned char *pp)
	{
	int pad=0,ret,i,neg;
	unsigned char p,n,pb=0;

	if (a == NULL) return(0);
	neg=a->type & V_ASN1_NEG;
	if (a->length == 0)
	ret=1;
	else
	{
	ret=a->length;
	i=a->data[0];
	if (!neg && (i > 127)) {
	pad=1;
	pb=0;
	} else if(neg) {
	if(i>128) {
	pad=1;
	pb=0xFF;
	} else if(i == 128) {
	/*
	* Special case: if any other bytes non zero we pad:
	* otherwise we don't.
	*/
	for(i = 1; i < a->length; i++) if(a->data[i]) {
	pad=1;
	pb=0xFF;
	break;
	}
	}
	}
	ret+=pad;
	}
	if (pp == NULL) return(ret);
	p= *pp;

	if (pad) *(p++)=pb;
	if (a->length == 0) *(p++)=0;
	else if (!neg) memcpy(p,a->data,(unsigned int)a->length);
	else {
	/* Begin at the end of the encoding */
	n=a->data + a->length - 1;
	p += a->length - 1;
	i = a->length;
	/* Copy zeros to destination as long as source is zero */
	while(!*n) {
	*(p--) = 0;
	n--;
	i--;
	}
	/* Complement and increment next octet */
	(p--) = (((n--)) ^ 0xff) + 1;
	i--;
	/* Complement any octets left */
	for(;i > 0; i--) (p--) = (n--) ^ 0xff;
	}

	*pp+=ret;
	return(ret);
	}

	/* Convert just ASN1 INTEGER content octets to ASN1_INTEGER structure */

	ASN1_INTEGER c2i_ASN1_INTEGER(ASN1_INTEGER a, const unsigned char *pp,
	long len)
	{
	ASN1_INTEGER *ret=NULL;
	const unsigned char p, pend;
	unsigned char to,s;
	int i;

	if ((a == NULL) \|\| ((*a) == NULL))
	{
	if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
	ret->type=V_ASN1_INTEGER;
	}
	else
	ret=(*a);

	p= *pp;
	pend = p + len;

	/* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
	* signifies a missing NULL parameter. */
	s=(unsigned char *)OPENSSL_malloc((int)len+1);
	if (s == NULL)
	{
	i=ERR_R_MALLOC_FAILURE;
	goto err;
	}
	to=s;
	if(!len) {
	/* Strictly speaking this is an illegal INTEGER but we
	* tolerate it.
	*/
	ret->type=V_ASN1_INTEGER;
	} else if (p & 0x80) / a negative number */
	{
	ret->type=V_ASN1_NEG_INTEGER;
	if ((*p == 0xff) && (len != 1)) {
	p++;
	len--;
	}
	i = len;
	p += i - 1;
	to += i - 1;
	while((!*p) && i) {
	*(to--) = 0;
	i--;
	p--;
	}
	/* Special case: if all zeros then the number will be of
	* the form FF followed by n zero bytes: this corresponds to
	* 1 followed by n zero bytes. We've already written n zeros
	* so we just append an extra one and set the first byte to
	* a 1. This is treated separately because it is the only case
	* where the number of bytes is larger than len.
	*/
	if(!i) {
	*s = 1;
	s[len] = 0;
	len++;
	} else {
	(to--) = ((p--) ^ 0xff) + 1;
	i--;
	for(;i > 0; i--) (to--) = (p--) ^ 0xff;
	}
	} else {
	ret->type=V_ASN1_INTEGER;
	if ((*p == 0) && (len != 1))
	{
	p++;
	len--;
	}
	memcpy(s,p,(int)len);
	}

	if (ret->data != NULL) OPENSSL_free(ret->data);
	ret->data=s;
	ret->length=(int)len;
	if (a != NULL) (*a)=ret;
	*pp=pend;
	return(ret);
	err:
	OPENSSL_PUT_ERROR(ASN1, c2i_ASN1_INTEGER, i);
	if ((ret != NULL) && ((a == NULL) \|\| (*a != ret)))
	M_ASN1_INTEGER_free(ret);
	return(NULL);
	}


	/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
	* ASN1 integers: some broken software can encode a positive INTEGER
	* with its MSB set as negative (it doesn't add a padding zero).
	*/

	ASN1_INTEGER d2i_ASN1_UINTEGER(ASN1_INTEGER a, const unsigned char *pp,
	long length)
	{
	ASN1_INTEGER *ret=NULL;
	const unsigned char *p;
	unsigned char *s;
	long len;
	int inf,tag,xclass;
	int i;

	if ((a == NULL) \|\| ((*a) == NULL))
	{
	if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
	ret->type=V_ASN1_INTEGER;
	}
	else
	ret=(*a);

	p= *pp;
	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
	if (inf & 0x80)
	{
	i=ASN1_R_BAD_OBJECT_HEADER;
	goto err;
	}

	if (tag != V_ASN1_INTEGER)
	{
	i=ASN1_R_EXPECTING_AN_INTEGER;
	goto err;
	}

	/* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
	* signifies a missing NULL parameter. */
	s=(unsigned char *)OPENSSL_malloc((int)len+1);
	if (s == NULL)
	{
	i=ERR_R_MALLOC_FAILURE;
	goto err;
	}
	ret->type=V_ASN1_INTEGER;
	if(len) {
	if ((*p == 0) && (len != 1))
	{
	p++;
	len--;
	}
	memcpy(s,p,(int)len);
	p+=len;
	}

	if (ret->data != NULL) OPENSSL_free(ret->data);
	ret->data=s;
	ret->length=(int)len;
	if (a != NULL) (*a)=ret;
	*pp=p;
	return(ret);
	err:
	OPENSSL_PUT_ERROR(ASN1, d2i_ASN1_UINTEGER, i);
	if ((ret != NULL) && ((a == NULL) \|\| (*a != ret)))
	M_ASN1_INTEGER_free(ret);
	return(NULL);
	}

	int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
	{
	int j,k;
	unsigned int i;
	unsigned char buf[sizeof(long)+1];
	long d;

	a->type=V_ASN1_INTEGER;
	if (a->length < (int)(sizeof(long)+1))
	{
	if (a->data != NULL)
	OPENSSL_free(a->data);
	if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL)
	memset((char *)a->data,0,sizeof(long)+1);
	}
	if (a->data == NULL)
	{
	OPENSSL_PUT_ERROR(ASN1, ASN1_INTEGER_set, ERR_R_MALLOC_FAILURE);
	return(0);
	}
	d=v;
	if (d < 0)
	{
	d= -d;
	a->type=V_ASN1_NEG_INTEGER;
	}

	for (i=0; i<sizeof(long); i++)
	{
	if (d == 0) break;
	buf[i]=(int)d&0xff;
	d>>=8;
	}
	j=0;
	for (k=i-1; k >=0; k--)
	a->data[j++]=buf[k];
	a->length=j;
	return(1);
	}

	long ASN1_INTEGER_get(const ASN1_INTEGER *a)
	{
	int neg=0,i;
	long r=0;

	if (a == NULL) return(0L);
	i=a->type;
	if (i == V_ASN1_NEG_INTEGER)
	neg=1;
	else if (i != V_ASN1_INTEGER)
	return -1;

	if (a->length > (int)sizeof(long))
	{
	/* hmm... a bit ugly, return all ones */
	return -1;
	}
	if (a->data == NULL)
	return 0;

	for (i=0; i<a->length; i++)
	{
	r<<=8;
	r\|=(unsigned char)a->data[i];
	}
	if (neg) r= -r;
	return(r);
	}

	ASN1_INTEGER BN_to_ASN1_INTEGER(const BIGNUM bn, ASN1_INTEGER *ai)
	{
	ASN1_INTEGER *ret;
	int len,j;

	if (ai == NULL)
	ret=M_ASN1_INTEGER_new();
	else
	ret=ai;
	if (ret == NULL)
	{
	OPENSSL_PUT_ERROR(ASN1, BN_to_ASN1_INTEGER, ASN1_R_NESTED_ASN1_ERROR);
	goto err;
	}
	if (BN_is_negative(bn))
	ret->type = V_ASN1_NEG_INTEGER;
	else ret->type=V_ASN1_INTEGER;
	j=BN_num_bits(bn);
	len=((j == 0)?0:((j/8)+1));
	if (ret->length < len+4)
	{
	unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);
	if (!new_data)
	{
	OPENSSL_PUT_ERROR(ASN1, BN_to_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
	goto err;
	}
	ret->data=new_data;
	}
	ret->length=BN_bn2bin(bn,ret->data);
	/* Correct zero case */
	if(!ret->length)
	{
	ret->data[0] = 0;
	ret->length = 1;
	}
	return(ret);
	err:
	if (ret != ai) M_ASN1_INTEGER_free(ret);
	return(NULL);
	}

	BIGNUM ASN1_INTEGER_to_BN(const ASN1_INTEGER ai, BIGNUM *bn)
	{
	BIGNUM *ret;

	if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
	OPENSSL_PUT_ERROR(ASN1, ASN1_INTEGER_to_BN, ASN1_R_BN_LIB);
	else if(ai->type == V_ASN1_NEG_INTEGER)
	BN_set_negative(ret, 1);
	return(ret);
	}