/* 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 #include #include "cryptlib.h" #include #include static int asn1_get_length(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; int ASN1_check_infinite_end(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_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass, long omax) { int i,ret; long l; 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(unsigned char **pp, int *inf, long *rl, int max) { unsigned char *p= *pp; unsigned long ret=0; 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) && (length == 0)) *(p++)=0x80; /* der_put_length would output 0 instead */ else asn1_put_length(&p,length); *pp=p; } 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 ((length == 0) && (constructed == 2)) ret+=2; ret++; if (length > 127) { while (length > 0) { length>>=8; ret++; } } return(ret); } int asn1_Finish(ASN1_CTX *c) { if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) { if (!ASN1_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_GetSequence(ASN1_CTX *c, long *length) { 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]='\0'; } 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(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); }