262 lines
8.2 KiB
C
262 lines
8.2 KiB
C
/* crypto/asn1/a_bitstr.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 "cryptlib.h"
|
|
#include <openssl/asn1.h>
|
|
|
|
int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
|
|
{
|
|
return M_ASN1_BIT_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;
|
|
memcpy(p, d, len);
|
|
p += len;
|
|
if (len > 0)
|
|
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 ((a == NULL) || ((*a) == NULL)) {
|
|
if ((ret = M_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 = (unsigned char *)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;
|
|
if (ret->data != NULL)
|
|
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 ((ret != NULL) && ((a == NULL) || (*a != ret)))
|
|
M_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 */
|
|
if (a->data == NULL)
|
|
c = (unsigned char *)OPENSSL_malloc(w + 1);
|
|
else
|
|
c = (unsigned char *)OPENSSL_realloc_clean(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(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_check(ASN1_BIT_STRING *a,
|
|
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;
|
|
}
|