[thirdparty/openssl.git] / crypto / asn1 / a_int.c

/* crypto/asn1/a_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/asn1.h>

int i2d_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
	{
	int pad=0,ret,r,i,t;
	unsigned char *p,*pt,*n,pb=0;

	if ((a == NULL) || (a->data == NULL)) return(0);
	t=a->type;
	if (a->length == 0)
		ret=1;
	else
		{
		ret=a->length;
		i=a->data[0];
		if ((t == V_ASN1_INTEGER) && (i > 127))
			{
			pad=1;
			pb=0;
			}
		else if ((t == V_ASN1_NEG_INTEGER) && (i>128))
			{
			pad=1;
			pb=0xFF;
			}
		ret+=pad;
		}
	r=ASN1_object_size(0,ret,V_ASN1_INTEGER);
	if (pp == NULL) return(r);
	p= *pp;

	ASN1_put_object(&p,0,ret,V_ASN1_INTEGER,V_ASN1_UNIVERSAL);
	if (pad) *(p++)=pb;
	if (a->length == 0)
		*(p++)=0;
	else if (t == V_ASN1_INTEGER)
		{
		memcpy(p,a->data,(unsigned int)a->length);
		p+=a->length;
		}
	else
		{
		n=a->data;
		pt=p;
		for (i=a->length; i>0; i--)
			*(p++)= (*(n++)^0xFF)+1;
		if (!pad) *pt|=0x80;
		}

	*pp=p;
	return(r);
	}

ASN1_INTEGER *d2i_ASN1_INTEGER(ASN1_INTEGER **a, unsigned char **pp,
	     long length)
	{
	ASN1_INTEGER *ret=NULL;
	unsigned char *p,*to,*s;
	long len;
	int inf,tag,xclass;
	int i;

	if ((a == NULL) || ((*a) == NULL))
		{
		if ((ret=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 Malloc stuff, even for 0 bytes otherwise it
	 * signifies a missing NULL parameter. */
	s=(unsigned char *)Malloc((int)len+1);
	if (s == NULL)
		{
		i=ERR_R_MALLOC_FAILURE;
		goto err;
		}
	to=s;
	if (*p & 0x80) /* a negative number */
		{
		ret->type=V_ASN1_NEG_INTEGER;
		if (*p == 0xff)
			{
			p++;
			len--;
			}
		for (i=(int)len; i>0; i--)
			*(to++)= (*(p++)^0xFF)+1;
		}
	else
		{
		ret->type=V_ASN1_INTEGER;
		if ((*p == 0) && (len != 1))
			{
			p++;
			len--;
			}
		memcpy(s,p,(int)len);
		p+=len;
		}

	if (ret->data != NULL) Free((char *)ret->data);
	ret->data=s;
	ret->length=(int)len;
	if (a != NULL) (*a)=ret;
	*pp=p;
	return(ret);
err:
	ASN1err(ASN1_F_D2I_ASN1_INTEGER,i);
	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
		ASN1_INTEGER_free(ret);
	return(NULL);
	}

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

	a->type=V_ASN1_INTEGER;
	if (a->length < (sizeof(long)+1))
		{
		if (a->data != NULL)
			Free((char *)a->data);
		if ((a->data=(unsigned char *)Malloc(sizeof(long)+1)) != NULL)
			memset((char *)a->data,0,sizeof(long)+1);
		}
	if (a->data == NULL)
		{
		ASN1err(ASN1_F_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;
	if (v < 0) a->data[j++]=0;
	for (k=i-1; k >=0; k--)
		a->data[j++]=buf[k];
	a->length=j;
	return(1);
	}

long ASN1_INTEGER_get(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(0);
	
	if (a->length > sizeof(long))
		{
		/* hmm... a bit ugly */
		return(0xffffffffL);
		}
	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(BIGNUM *bn, ASN1_INTEGER *ai)
	{
	ASN1_INTEGER *ret;
	int len,j;

	if (ai == NULL)
		ret=ASN1_INTEGER_new();
	else
		ret=ai;
	if (ret == NULL)
		{
		ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR);
		goto err;
		}
	ret->type=V_ASN1_INTEGER;
	j=BN_num_bits(bn);
	len=((j == 0)?0:((j/8)+1));
	ret->data=(unsigned char *)Malloc(len+4);
	ret->length=BN_bn2bin(bn,ret->data);
	return(ret);
err:
	if (ret != ai) ASN1_INTEGER_free(ret);
	return(NULL);
	}

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

	if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
		ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB);
	return(ret);
	}
Commit	Line	Data
d02b48c6	1	/* crypto/asn1/a_int.c */
58964a49	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6 RE	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
	59	#include <stdio.h>
	60	#include "cryptlib.h"
ec577822	61	#include <openssl/asn1.h>
d02b48c6	62
6b691a5c	63	int i2d_ASN1_INTEGER(ASN1_INTEGER a, unsigned char *pp)
d02b48c6 RE	64	{
	65	int pad=0,ret,r,i,t;
	66	unsigned char p,pt,*n,pb=0;
	67
	68	if ((a == NULL) \|\| (a->data == NULL)) return(0);
	69	t=a->type;
	70	if (a->length == 0)
	71	ret=1;
	72	else
	73	{
	74	ret=a->length;
	75	i=a->data[0];
	76	if ((t == V_ASN1_INTEGER) && (i > 127))
	77	{
	78	pad=1;
	79	pb=0;
	80	}
	81	else if ((t == V_ASN1_NEG_INTEGER) && (i>128))
	82	{
	83	pad=1;
	84	pb=0xFF;
	85	}
	86	ret+=pad;
	87	}
	88	r=ASN1_object_size(0,ret,V_ASN1_INTEGER);
	89	if (pp == NULL) return(r);
	90	p= *pp;
	91
	92	ASN1_put_object(&p,0,ret,V_ASN1_INTEGER,V_ASN1_UNIVERSAL);
	93	if (pad) *(p++)=pb;
	94	if (a->length == 0)
	95	*(p++)=0;
	96	else if (t == V_ASN1_INTEGER)
	97	{
	98	memcpy(p,a->data,(unsigned int)a->length);
	99	p+=a->length;
	100	}
	101	else
	102	{
	103	n=a->data;
	104	pt=p;
	105	for (i=a->length; i>0; i--)
	106	(p++)= ((n++)^0xFF)+1;
	107	if (!pad) *pt\|=0x80;
	108	}
	109
	110	*pp=p;
	111	return(r);
	112	}
	113
6b691a5c UM	114	ASN1_INTEGER d2i_ASN1_INTEGER(ASN1_INTEGER a, unsigned char *pp,
6b691a5c UM	115	long length)
d02b48c6 RE	116	{
	117	ASN1_INTEGER *ret=NULL;
	118	unsigned char p,to,*s;
	119	long len;
	120	int inf,tag,xclass;
	121	int i;
	122
	123	if ((a == NULL) \|\| ((*a) == NULL))
	124	{
	125	if ((ret=ASN1_INTEGER_new()) == NULL) return(NULL);
	126	ret->type=V_ASN1_INTEGER;
	127	}
	128	else
	129	ret=(*a);
	130
	131	p= *pp;
	132	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
	133	if (inf & 0x80)
	134	{
	135	i=ASN1_R_BAD_OBJECT_HEADER;
	136	goto err;
	137	}
	138
	139	if (tag != V_ASN1_INTEGER)
	140	{
	141	i=ASN1_R_EXPECTING_AN_INTEGER;
	142	goto err;
	143	}
	144
	145	/* We must Malloc stuff, even for 0 bytes otherwise it
	146	* signifies a missing NULL parameter. */
	147	s=(unsigned char *)Malloc((int)len+1);
	148	if (s == NULL)
	149	{
	150	i=ERR_R_MALLOC_FAILURE;
	151	goto err;
	152	}
	153	to=s;
	154	if (p & 0x80) / a negative number */
	155	{
	156	ret->type=V_ASN1_NEG_INTEGER;
	157	if (*p == 0xff)
	158	{
	159	p++;
	160	len--;
	161	}
	162	for (i=(int)len; i>0; i--)
	163	(to++)= ((p++)^0xFF)+1;
	164	}
	165	else
	166	{
	167	ret->type=V_ASN1_INTEGER;
	168	if ((*p == 0) && (len != 1))
	169	{
	170	p++;
	171	len--;
	172	}
	173	memcpy(s,p,(int)len);
	174	p+=len;
	175	}
	176
	177	if (ret->data != NULL) Free((char *)ret->data);
	178	ret->data=s;
	179	ret->length=(int)len;
180	if (a != NULL) (*a)=ret;
181	*pp=p;
182	return(ret);
183	err:
184	ASN1err(ASN1_F_D2I_ASN1_INTEGER,i);
185	if ((ret != NULL) && ((a == NULL) \|\| (*a != ret)))
186	ASN1_INTEGER_free(ret);
187	return(NULL);
188	}
189
6b691a5c	190	int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
d02b48c6 RE	191	{
	192	int i,j,k;
	193	unsigned char buf[sizeof(long)+1];
	194	long d;
	195
	196	a->type=V_ASN1_INTEGER;
	197	if (a->length < (sizeof(long)+1))
	198	{
	199	if (a->data != NULL)
	200	Free((char *)a->data);
	201	if ((a->data=(unsigned char *)Malloc(sizeof(long)+1)) != NULL)
	202	memset((char *)a->data,0,sizeof(long)+1);
	203	}
	204	if (a->data == NULL)
	205	{
	206	ASN1err(ASN1_F_ASN1_INTEGER_SET,ERR_R_MALLOC_FAILURE);
	207	return(0);
	208	}
	209	d=v;
	210	if (d < 0)
	211	{
	212	d= -d;
	213	a->type=V_ASN1_NEG_INTEGER;
	214	}
	215
	216	for (i=0; i<sizeof(long); i++)
	217	{
	218	if (d == 0) break;
	219	buf[i]=(int)d&0xff;
	220	d>>=8;
	221	}
	222	j=0;
	223	if (v < 0) a->data[j++]=0;
	224	for (k=i-1; k >=0; k--)
	225	a->data[j++]=buf[k];
	226	a->length=j;
	227	return(1);
	228	}
	229
6b691a5c	230	long ASN1_INTEGER_get(ASN1_INTEGER *a)
d02b48c6 RE	231	{
	232	int neg=0,i;
	233	long r=0;
	234
	235	if (a == NULL) return(0L);
	236	i=a->type;
	237	if (i == V_ASN1_NEG_INTEGER)
	238	neg=1;
	239	else if (i != V_ASN1_INTEGER)
	240	return(0);
	241
	242	if (a->length > sizeof(long))
	243	{
58964a49 RE	244	/* hmm... a bit ugly */
58964a49 RE	245	return(0xffffffffL);
d02b48c6 RE	246	}
	247	if (a->data == NULL)
	248	return(0);
	249
	250	for (i=0; i<a->length; i++)
	251	{
	252	r<<=8;
	253	r\|=(unsigned char)a->data[i];
	254	}
	255	if (neg) r= -r;
	256	return(r);
	257	}
	258
6b691a5c	259	ASN1_INTEGER BN_to_ASN1_INTEGER(BIGNUM bn, ASN1_INTEGER *ai)
d02b48c6 RE	260	{
	261	ASN1_INTEGER *ret;
	262	int len,j;
	263
	264	if (ai == NULL)
	265	ret=ASN1_INTEGER_new();
	266	else
	267	ret=ai;
	268	if (ret == NULL)
	269	{
dfeab068	270	ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR);
d02b48c6 RE	271	goto err;
	272	}
	273	ret->type=V_ASN1_INTEGER;
	274	j=BN_num_bits(bn);
	275	len=((j == 0)?0:((j/8)+1));
	276	ret->data=(unsigned char *)Malloc(len+4);
	277	ret->length=BN_bn2bin(bn,ret->data);
	278	return(ret);
	279	err:
	280	if (ret != ai) ASN1_INTEGER_free(ret);
	281	return(NULL);
	282	}
	283
6b691a5c	284	BIGNUM ASN1_INTEGER_to_BN(ASN1_INTEGER ai, BIGNUM *bn)
d02b48c6 RE	285	{
	286	BIGNUM *ret;
	287
	288	if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
	289	ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB);
	290	return(ret);
	291	}