asn1_lib.c
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- /* crypto/asn1/asn1_lib.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 <limits.h>
- #include "cryptlib.h"
- #include <openssl/asn1.h>
- #include <openssl/asn1_mac.h>
- static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max);
- static void asn1_put_length(unsigned char **pp, int length);
- const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT;
- static int _asn1_check_infinite_end(const unsigned char **p, long len)
- {
- /* If there is 0 or 1 byte left, the length check should pick
- * things up */
- if (len <= 0)
- return(1);
- else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
- {
- (*p)+=2;
- return(1);
- }
- return(0);
- }
- int ASN1_check_infinite_end(unsigned char **p, long len)
- {
- return _asn1_check_infinite_end((const unsigned char **)p, len);
- }
- int ASN1_const_check_infinite_end(const unsigned char **p, long len)
- {
- return _asn1_check_infinite_end(p, len);
- }
- int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
- int *pclass, long omax)
- {
- int i,ret;
- long l;
- const unsigned char *p= *pp;
- int tag,xclass,inf;
- long max=omax;
- if (!max) goto err;
- ret=(*p&V_ASN1_CONSTRUCTED);
- xclass=(*p&V_ASN1_PRIVATE);
- i= *p&V_ASN1_PRIMITIVE_TAG;
- if (i == V_ASN1_PRIMITIVE_TAG)
- { /* high-tag */
- p++;
- if (--max == 0) goto err;
- l=0;
- while (*p&0x80)
- {
- l<<=7L;
- l|= *(p++)&0x7f;
- if (--max == 0) goto err;
- if (l > (INT_MAX >> 7L)) goto err;
- }
- l<<=7L;
- l|= *(p++)&0x7f;
- tag=(int)l;
- if (--max == 0) goto err;
- }
- else
- {
- tag=i;
- p++;
- if (--max == 0) goto err;
- }
- *ptag=tag;
- *pclass=xclass;
- if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
- #if 0
- fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)n",
- (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
- (int)(omax+ *pp));
- #endif
- if (*plength > (omax - (p - *pp)))
- {
- ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
- /* Set this so that even if things are not long enough
- * the values are set correctly */
- ret|=0x80;
- }
- *pp=p;
- return(ret|inf);
- err:
- ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
- return(0x80);
- }
- static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)
- {
- const unsigned char *p= *pp;
- unsigned long ret=0;
- unsigned int i;
- if (max-- < 1) return(0);
- if (*p == 0x80)
- {
- *inf=1;
- ret=0;
- p++;
- }
- else
- {
- *inf=0;
- i= *p&0x7f;
- if (*(p++) & 0x80)
- {
- if (i > sizeof(long))
- return 0;
- if (max-- == 0) return(0);
- while (i-- > 0)
- {
- ret<<=8L;
- ret|= *(p++);
- if (max-- == 0) return(0);
- }
- }
- else
- ret=i;
- }
- if (ret > LONG_MAX)
- return 0;
- *pp=p;
- *rl=(long)ret;
- return(1);
- }
- /* class 0 is constructed
- * constructed == 2 for indefinite length constructed */
- void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
- int xclass)
- {
- unsigned char *p= *pp;
- int i, ttag;
- i=(constructed)?V_ASN1_CONSTRUCTED:0;
- i|=(xclass&V_ASN1_PRIVATE);
- if (tag < 31)
- *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
- else
- {
- *(p++)=i|V_ASN1_PRIMITIVE_TAG;
- for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
- ttag = i;
- while(i-- > 0)
- {
- p[i] = tag & 0x7f;
- if(i != (ttag - 1)) p[i] |= 0x80;
- tag >>= 7;
- }
- p += ttag;
- }
- if (constructed == 2)
- *(p++)=0x80;
- else
- asn1_put_length(&p,length);
- *pp=p;
- }
- int ASN1_put_eoc(unsigned char **pp)
- {
- unsigned char *p = *pp;
- *p++ = 0;
- *p++ = 0;
- *pp = p;
- return 2;
- }
- static void asn1_put_length(unsigned char **pp, int length)
- {
- unsigned char *p= *pp;
- int i,l;
- if (length <= 127)
- *(p++)=(unsigned char)length;
- else
- {
- l=length;
- for (i=0; l > 0; i++)
- l>>=8;
- *(p++)=i|0x80;
- l=i;
- while (i-- > 0)
- {
- p[i]=length&0xff;
- length>>=8;
- }
- p+=l;
- }
- *pp=p;
- }
- int ASN1_object_size(int constructed, int length, int tag)
- {
- int ret;
- ret=length;
- ret++;
- if (tag >= 31)
- {
- while (tag > 0)
- {
- tag>>=7;
- ret++;
- }
- }
- if (constructed == 2)
- return ret + 3;
- ret++;
- if (length > 127)
- {
- while (length > 0)
- {
- length>>=8;
- ret++;
- }
- }
- return(ret);
- }
- static int _asn1_Finish(ASN1_const_CTX *c)
- {
- if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
- {
- if (!ASN1_const_check_infinite_end(&c->p,c->slen))
- {
- c->error=ERR_R_MISSING_ASN1_EOS;
- return(0);
- }
- }
- if ( ((c->slen != 0) && !(c->inf & 1)) ||
- ((c->slen < 0) && (c->inf & 1)))
- {
- c->error=ERR_R_ASN1_LENGTH_MISMATCH;
- return(0);
- }
- return(1);
- }
- int asn1_Finish(ASN1_CTX *c)
- {
- return _asn1_Finish((ASN1_const_CTX *)c);
- }
- int asn1_const_Finish(ASN1_const_CTX *c)
- {
- return _asn1_Finish(c);
- }
- int asn1_GetSequence(ASN1_const_CTX *c, long *length)
- {
- const unsigned char *q;
- q=c->p;
- c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
- *length);
- if (c->inf & 0x80)
- {
- c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
- return(0);
- }
- if (c->tag != V_ASN1_SEQUENCE)
- {
- c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
- return(0);
- }
- (*length)-=(c->p-q);
- if (c->max && (*length < 0))
- {
- c->error=ERR_R_ASN1_LENGTH_MISMATCH;
- return(0);
- }
- if (c->inf == (1|V_ASN1_CONSTRUCTED))
- c->slen= *length+ *(c->pp)-c->p;
- c->eos=0;
- return(1);
- }
- ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
- {
- ASN1_STRING *ret;
- if (str == NULL) return(NULL);
- if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
- return(NULL);
- if (!ASN1_STRING_set(ret,str->data,str->length))
- {
- ASN1_STRING_free(ret);
- return(NULL);
- }
- ret->flags = str->flags;
- return(ret);
- }
- int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
- {
- unsigned char *c;
- const char *data=_data;
- if (len < 0)
- {
- if (data == NULL)
- return(0);
- else
- len=strlen(data);
- }
- if ((str->length < len) || (str->data == NULL))
- {
- c=str->data;
- if (c == NULL)
- str->data=OPENSSL_malloc(len+1);
- else
- str->data=OPENSSL_realloc(c,len+1);
- if (str->data == NULL)
- {
- ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
- str->data=c;
- return(0);
- }
- }
- str->length=len;
- if (data != NULL)
- {
- memcpy(str->data,data,len);
- /* an allowance for strings :-) */
- str->data[len]=' ';
- }
- return(1);
- }
- ASN1_STRING *ASN1_STRING_new(void)
- {
- return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
- }
- ASN1_STRING *ASN1_STRING_type_new(int type)
- {
- ASN1_STRING *ret;
- ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
- if (ret == NULL)
- {
- ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
- return(NULL);
- }
- ret->length=0;
- ret->type=type;
- ret->data=NULL;
- ret->flags=0;
- return(ret);
- }
- void ASN1_STRING_free(ASN1_STRING *a)
- {
- if (a == NULL) return;
- if (a->data != NULL) OPENSSL_free(a->data);
- OPENSSL_free(a);
- }
- int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
- {
- int i;
- i=(a->length-b->length);
- if (i == 0)
- {
- i=memcmp(a->data,b->data,a->length);
- if (i == 0)
- return(a->type-b->type);
- else
- return(i);
- }
- else
- return(i);
- }
- void asn1_add_error(const unsigned char *address, int offset)
- {
- char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
- BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
- BIO_snprintf(buf2,sizeof buf2,"%d",offset);
- ERR_add_error_data(4,"address=",buf1," offset=",buf2);
- }
- int ASN1_STRING_length(ASN1_STRING *x)
- { return M_ASN1_STRING_length(x); }
- void ASN1_STRING_length_set(ASN1_STRING *x, int len)
- { M_ASN1_STRING_length_set(x, len); return; }
- int ASN1_STRING_type(ASN1_STRING *x)
- { return M_ASN1_STRING_type(x); }
- unsigned char * ASN1_STRING_data(ASN1_STRING *x)
- { return M_ASN1_STRING_data(x); }