265 lines
7 KiB
C
265 lines
7 KiB
C
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/* $OpenBSD: a_bitstr.c,v 1.30 2020/09/03 17:19:27 tb Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <string.h>
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#include <openssl/asn1.h>
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#include <openssl/err.h>
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int
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ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
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{
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return ASN1_STRING_set(x, d, len);
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}
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int
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i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
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{
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int ret, j, bits, len;
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unsigned char *p, *d;
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if (a == NULL)
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return (0);
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len = a->length;
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if (len > 0) {
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if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) {
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bits = (int)a->flags & 0x07;
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} else {
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for (; len > 0; len--) {
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if (a->data[len - 1])
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break;
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}
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j = a->data[len - 1];
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if (j & 0x01)
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bits = 0;
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else if (j & 0x02)
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bits = 1;
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else if (j & 0x04)
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bits = 2;
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else if (j & 0x08)
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bits = 3;
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else if (j & 0x10)
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bits = 4;
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else if (j & 0x20)
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bits = 5;
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else if (j & 0x40)
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bits = 6;
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else if (j & 0x80)
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bits = 7;
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else
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bits = 0; /* should not happen */
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}
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} else
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bits = 0;
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ret = 1 + len;
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if (pp == NULL)
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return (ret);
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p= *pp;
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*(p++) = (unsigned char)bits;
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d = a->data;
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if (len > 0) {
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memcpy(p, d, len);
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p += len;
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p[-1] &= 0xff << bits;
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}
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*pp = p;
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return (ret);
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}
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ASN1_BIT_STRING *
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c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, const unsigned char **pp, long len)
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{
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ASN1_BIT_STRING *ret = NULL;
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const unsigned char *p;
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unsigned char *s;
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int i;
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if (len < 1) {
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ASN1error(ASN1_R_STRING_TOO_SHORT);
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goto err;
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}
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if (a == NULL || *a == NULL) {
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if ((ret = ASN1_BIT_STRING_new()) == NULL)
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return (NULL);
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} else
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ret = *a;
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p = *pp;
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i = *(p++);
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if (i > 7) {
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ASN1error(ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
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goto err;
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}
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/*
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* We do this to preserve the settings. If we modify the settings,
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* via the _set_bit function, we will recalculate on output.
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*/
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ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */
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ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | i); /* set */
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/* using one because of the bits left byte */
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if (len-- > 1) {
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if ((s = malloc(len)) == NULL) {
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ASN1error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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memcpy(s, p, len);
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s[len - 1] &= (0xff << i);
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p += len;
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} else
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s = NULL;
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free(ret->data);
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ret->data = s;
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ret->length = (int)len;
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ret->type = V_ASN1_BIT_STRING;
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if (a != NULL)
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*a = ret;
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*pp = p;
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return (ret);
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err:
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if (a == NULL || *a != ret)
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ASN1_BIT_STRING_free(ret);
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return (NULL);
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}
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int
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ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
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{
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int w, v, iv;
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unsigned char *c;
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w = n/8;
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v = 1 << (7 - (n & 0x07));
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iv = ~v;
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if (!value)
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v = 0;
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if (a == NULL)
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return 0;
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a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */
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if ((a->length < (w + 1)) || (a->data == NULL)) {
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if (!value)
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return(1); /* Don't need to set */
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if ((c = recallocarray(a->data, a->length, w + 1, 1)) == NULL) {
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ASN1error(ERR_R_MALLOC_FAILURE);
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return 0;
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}
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a->data = c;
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a->length = w + 1;
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}
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a->data[w] = ((a->data[w]) & iv) | v;
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while ((a->length > 0) && (a->data[a->length - 1] == 0))
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a->length--;
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return (1);
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}
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int
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ASN1_BIT_STRING_get_bit(const ASN1_BIT_STRING *a, int n)
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{
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int w, v;
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w = n / 8;
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v = 1 << (7 - (n & 0x07));
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if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL))
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return (0);
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return ((a->data[w] & v) != 0);
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}
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/*
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* Checks if the given bit string contains only bits specified by
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* the flags vector. Returns 0 if there is at least one bit set in 'a'
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* which is not specified in 'flags', 1 otherwise.
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* 'len' is the length of 'flags'.
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*/
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int
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ASN1_BIT_STRING_check(const ASN1_BIT_STRING *a, const unsigned char *flags,
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int flags_len)
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{
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int i, ok;
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/* Check if there is one bit set at all. */
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if (!a || !a->data)
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return 1;
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/* Check each byte of the internal representation of the bit string. */
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ok = 1;
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for (i = 0; i < a->length && ok; ++i) {
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unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
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/* We are done if there is an unneeded bit set. */
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ok = (a->data[i] & mask) == 0;
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}
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return ok;
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}
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