--- /dev/null
+/* 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++);
+ /* 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&0x07)); /* 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;
+ }
projects / cassiopeia.git / blobdiff