-/* crypto/asn1/a_bitstr.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. 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.]
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
+#include <limits.h>
#include <stdio.h>
-#include "cryptlib.h"
-#include "asn1.h"
-
-/* ASN1err(ASN1_F_ASN1_STRING_NEW,ASN1_R_STRING_TOO_SHORT);
- * ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,ASN1_R_EXPECTING_A_BIT_STRING);
+#include "internal/cryptlib.h"
+#include <openssl/asn1.h>
+#include "asn1_locl.h"
+
+int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
+{
+ return ASN1_STRING_set(x, d, len);
+}
+
+int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
+{
+ int ret, j, bits, len;
+ unsigned char *p, *d;
+
+ if (a == NULL)
+ return (0);
+
+ len = a->length;
+
+ if (len > 0) {
+ if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) {
+ bits = (int)a->flags & 0x07;
+ } else {
+ for (; len > 0; len--) {
+ if (a->data[len - 1])
+ break;
+ }
+ j = a->data[len - 1];
+ if (j & 0x01)
+ bits = 0;
+ else if (j & 0x02)
+ bits = 1;
+ else if (j & 0x04)
+ bits = 2;
+ else if (j & 0x08)
+ bits = 3;
+ else if (j & 0x10)
+ bits = 4;
+ else if (j & 0x20)
+ bits = 5;
+ else if (j & 0x40)
+ bits = 6;
+ else if (j & 0x80)
+ bits = 7;
+ else
+ bits = 0; /* should not happen */
+ }
+ } else
+ bits = 0;
+
+ ret = 1 + len;
+ if (pp == NULL)
+ return (ret);
+
+ p = *pp;
+
+ *(p++) = (unsigned char)bits;
+ d = a->data;
+ if (len > 0) {
+ memcpy(p, d, len);
+ p += len;
+ p[-1] &= (0xff << bits);
+ }
+ *pp = p;
+ return (ret);
+}
+
+ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,
+ const unsigned char **pp, long len)
+{
+ ASN1_BIT_STRING *ret = NULL;
+ const unsigned char *p;
+ unsigned char *s;
+ int i;
+
+ if (len < 1) {
+ i = ASN1_R_STRING_TOO_SHORT;
+ goto err;
+ }
+
+ if (len > INT_MAX) {
+ i = ASN1_R_STRING_TOO_LONG;
+ goto err;
+ }
+
+ if ((a == NULL) || ((*a) == NULL)) {
+ if ((ret = ASN1_BIT_STRING_new()) == NULL)
+ return (NULL);
+ } else
+ ret = (*a);
+
+ p = *pp;
+ i = *(p++);
+ if (i > 7) {
+ i = ASN1_R_INVALID_BIT_STRING_BITS_LEFT;
+ goto err;
+ }
+ /*
+ * We do this to preserve the settings. If we modify the settings, via
+ * the _set_bit function, we will recalculate on output
+ */
+ ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */
+ ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | i); /* set */
+
+ if (len-- > 1) { /* using one because of the bits left byte */
+ s = OPENSSL_malloc((int)len);
+ if (s == NULL) {
+ i = ERR_R_MALLOC_FAILURE;
+ goto err;
+ }
+ memcpy(s, p, (int)len);
+ s[len - 1] &= (0xff << i);
+ p += len;
+ } else
+ s = NULL;
+
+ ret->length = (int)len;
+ OPENSSL_free(ret->data);
+ ret->data = s;
+ ret->type = V_ASN1_BIT_STRING;
+ if (a != NULL)
+ (*a) = ret;
+ *pp = p;
+ return (ret);
+ err:
+ ASN1err(ASN1_F_C2I_ASN1_BIT_STRING, i);
+ if ((a == NULL) || (*a != ret))
+ ASN1_BIT_STRING_free(ret);
+ return (NULL);
+}
+
+/*
+ * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
*/
-
-int i2d_ASN1_BIT_STRING(a,pp)
-ASN1_BIT_STRING *a;
-unsigned char **pp;
- {
- int ret,j,r,bits;
- unsigned char *p,*d;
-
- if (a == NULL) return(0);
-
- /* our bit strings are always a multiple of 8 :-) */
- bits=0;
- ret=1+a->length;
- r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING);
- if (pp == NULL) return(r);
- p= *pp;
-
- ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
- if (bits == 0)
- j=0;
- else j=8-bits;
- *(p++)=(unsigned char)j;
- d=a->data;
- memcpy(p,d,a->length);
- p+=a->length;
- if (a->length > 0) p[-1]&=(0xff<<j);
- *pp=p;
- return(r);
- }
-
-ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(a, pp, length)
-ASN1_BIT_STRING **a;
-unsigned char **pp;
-long length;
- {
- ASN1_BIT_STRING *ret=NULL;
- unsigned char *p,*s;
- long len;
- int inf,tag,xclass;
- int i;
-
- if ((a == NULL) || ((*a) == NULL))
- {
- if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL);
- }
- 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_BIT_STRING)
- {
- i=ASN1_R_EXPECTING_A_BIT_STRING;
- goto err;
- }
- if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
-
- i= *(p++);
- if (len-- > 1) /* using one because of the bits left byte */
- {
- s=(unsigned char *)Malloc((int)len);
- if (s == NULL)
- {
- i=ERR_R_MALLOC_FAILURE;
- goto err;
- }
- memcpy(s,p,(int)len);
- s[len-1]&=(0xff<<i);
- p+=len;
- }
- else
- s=NULL;
-
- ret->length=(int)len;
- if (ret->data != NULL) Free((char *)ret->data);
- ret->data=s;
- ret->type=V_ASN1_BIT_STRING;
- if (a != NULL) (*a)=ret;
- *pp=p;
- return(ret);
-err:
- ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
- if ((ret != NULL) && ((a == NULL) || (*a != ret)))
- ASN1_BIT_STRING_free(ret);
- return(NULL);
- }
-
-/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
+int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
+{
+ int w, v, iv;
+ unsigned char *c;
+
+ w = n / 8;
+ v = 1 << (7 - (n & 0x07));
+ iv = ~v;
+ if (!value)
+ v = 0;
+
+ if (a == NULL)
+ return 0;
+
+ a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */
+
+ if ((a->length < (w + 1)) || (a->data == NULL)) {
+ if (!value)
+ return (1); /* Don't need to set */
+ c = OPENSSL_clear_realloc(a->data, a->length, w + 1);
+ if (c == NULL) {
+ ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ if (w + 1 - a->length > 0)
+ memset(c + a->length, 0, w + 1 - a->length);
+ a->data = c;
+ a->length = w + 1;
+ }
+ a->data[w] = ((a->data[w]) & iv) | v;
+ while ((a->length > 0) && (a->data[a->length - 1] == 0))
+ a->length--;
+ return (1);
+}
+
+int ASN1_BIT_STRING_get_bit(const ASN1_BIT_STRING *a, int n)
+{
+ int w, v;
+
+ w = n / 8;
+ v = 1 << (7 - (n & 0x07));
+ if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL))
+ return (0);
+ return ((a->data[w] & v) != 0);
+}
+
+/*
+ * Checks if the given bit string contains only bits specified by
+ * the flags vector. Returns 0 if there is at least one bit set in 'a'
+ * which is not specified in 'flags', 1 otherwise.
+ * 'len' is the length of 'flags'.
*/
-int ASN1_BIT_STRING_set_bit(a,n,value)
-ASN1_BIT_STRING *a;
-int n;
-int value;
- {
- int w,v,iv;
- unsigned char *c;
-
- w=n/8;
- v=1<<(7-(n&0x07));
- iv= ~v;
-
- if (a == NULL) return(0);
- if ((a->length < (w+1)) || (a->data == NULL))
- {
- if (!value) return(1); /* Don't need to set */
- if (a->data == NULL)
- c=(unsigned char *)Malloc(w+1);
- else
- c=(unsigned char *)Realloc(a->data,w+1);
- if (c == NULL) return(0);
- a->data=c;
- a->length=w+1;
- c[w]=0;
- }
- a->data[w]=((a->data[w])&iv)|v;
- while ((a->length > 0) && (a->data[a->length-1] == 0))
- a->length--;
- return(1);
- }
-
-int ASN1_BIT_STRING_get_bit(a,n)
-ASN1_BIT_STRING *a;
-int n;
- {
- int w,v;
-
- w=n/8;
- v=1<<(7-(n&0x07));
- if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
- return(0);
- return((a->data[w]&v) != 0);
- }
-
+int ASN1_BIT_STRING_check(const ASN1_BIT_STRING *a,
+ const unsigned char *flags, int flags_len)
+{
+ int i, ok;
+ /* Check if there is one bit set at all. */
+ if (!a || !a->data)
+ return 1;
+
+ /*
+ * Check each byte of the internal representation of the bit string.
+ */
+ ok = 1;
+ for (i = 0; i < a->length && ok; ++i) {
+ unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
+ /* We are done if there is an unneeded bit set. */
+ ok = (a->data[i] & mask) == 0;
+ }
+ return ok;
+}
projects / openssl.git / blobdiff