/* crypto/asn1/a_bitstr.c */
-/* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
#include <stdio.h>
#include "cryptlib.h"
-#include "asn1.h"
+#include <openssl/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);
- */
-
-int i2d_ASN1_BIT_STRING(a,pp)
-ASN1_BIT_STRING *a;
-unsigned char **pp;
+int i2d_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
{
- int ret,j,r,bits;
+ int ret,j,r,bits,len;
unsigned char *p,*d;
if (a == NULL) return(0);
- /* our bit strings are always a multiple of 8 :-) */
- bits=0;
- ret=1+a->length;
+ 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;
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;
+ *(p++)=(unsigned char)bits;
d=a->data;
- memcpy(p,d,a->length);
- p+=a->length;
- if (a->length > 0) p[-1]&=(0xff<<j);
+ memcpy(p,d,len);
+ p+=len;
+ if (len > 0) p[-1]&=(0xff<<bits);
*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 *d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp,
+ long length)
{
ASN1_BIT_STRING *ret=NULL;
unsigned char *p,*s;
if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
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 *)Malloc((int)len);
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;
+
+ a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */
+
+ 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(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);
+ }
+