Added SEC_ASN1DecodeInteger function

security/nss/lib/util/secasn1.h

@@ -36,7 +36,7 @@
  * Encoding Rules).  The routines are found in and used extensively by the
  * security library, but exported for other use.
  *
- * $Id: secasn1.h,v 1.1 2000/03/31 19:38:47 relyea%netscape.com Exp $
+ * $Id: secasn1.h,v 1.2 2000/05/22 15:24:19 chrisk%netscape.com Exp $
  */
 
 #ifndef _SECASN1_H_
@@ -137,6 +137,8 @@ extern SECItem * SEC_ASN1EncodeUnsignedInteger(PRArenaPool *pool,
 					       SECItem *dest,
 					       unsigned long value);
 
+extern SECStatus SEC_ASN1DecodeInteger(SECItem *src,
+				       unsigned long *value);
 
 /*
 ** Utilities.

security/nss/lib/util/secasn1d.c

@@ -35,7 +35,7 @@
  * Support for DEcoding ASN.1 data based on BER/DER (Basic/Distinguished
  * Encoding Rules).
  *
- * $Id: secasn1d.c,v 1.1 2000/03/31 19:38:50 relyea%netscape.com Exp $
+ * $Id: secasn1d.c,v 1.2 2000/05/22 15:24:20 chrisk%netscape.com Exp $
  */
 
 #include "secasn1.h"
@@ -2185,6 +2185,47 @@ sec_asn1d_after_choice
   sec_asn1d_pop_state(state);
 }
 
+unsigned long
+sec_asn1d_uinteger(SECItem *src)
+{
+    unsigned long value;
+    int len;
+
+    if (src->len > 5 || (src->len > 4 && src->data[0] == 0))
+	return 0;
+
+    value = 0;
+    len = src->len;
+    while (len) {
+	value <<= 8;
+	value |= src->data[--len];
+    }
+    return value;
+}
+
+SECStatus
+SEC_ASN1DecodeInteger(SECItem *src, unsigned long *value)
+{
+    unsigned long v;
+    int i;
+    
+    if (src->len > sizeof(unsigned long))
+	return SECFailure;
+
+    if (src->data[0] & 0x80)
+	v = -1;		/* signed and negative - start with all 1's */
+    else
+	v = 0;
+
+    for (i= 0; i < src->len; i++) {
+	/* shift in next byte */
+	v <<= 8;
+	v |= src->data[i];
+    }
+    *value = v;
+    return SECSuccess;
+}
+
 #ifdef DEBUG_ASN1D_STATES
 static void
 dump_states