/* $OpenBSD: asn1_old_lib.c,v 1.7 2025/05/10 05:54:38 tb Exp $ */ /* 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 <limits.h> #include <stdio.h> #include <string.h> #include <openssl/asn1.h> #include "asn1_local.h" #include "err_local.h" static void asn1_put_length(unsigned char **pp, int length); int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag, int *pclass, long omax) { int constructed, indefinite; uint32_t tag_number; uint8_t tag_class; size_t length; CBS cbs; int ret = 0; *pclass = 0; *ptag = 0; *plength = 0; CBS_init(&cbs, *pp, omax); if (!asn1_get_object_cbs(&cbs, 0, &tag_class, &constructed, &tag_number, &indefinite, &length)) { ASN1error(ASN1_R_HEADER_TOO_LONG); return 0x80; } if (tag_number > INT_MAX) { ASN1error(ASN1_R_HEADER_TOO_LONG); return 0x80; } /* * API insanity ahead... in this case we add an error to the stack and * signal an error by setting the 8th bit in the return value... but we * still provide all of the decoded data. */ if (length > CBS_len(&cbs) || length > LONG_MAX) { ASN1error(ASN1_R_TOO_LONG); ret = 0x80; } *pclass = tag_class << 6; *ptag = tag_number; *plength = length; *pp = CBS_data(&cbs); if (constructed) ret |= 1 << 5; if (indefinite) ret |= 1; return ret; } LCRYPTO_ALIAS(ASN1_get_object); /* 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; } LCRYPTO_ALIAS(ASN1_put_object); int ASN1_put_eoc(unsigned char **pp) { unsigned char *p = *pp; *p++ = 0; *p++ = 0; *pp = p; return 2; } LCRYPTO_ALIAS(ASN1_put_eoc); 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); } LCRYPTO_ALIAS(ASN1_object_size);
