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-rw-r--r--source4/libcli/util/asn1.c44
1 files changed, 40 insertions, 4 deletions
diff --git a/source4/libcli/util/asn1.c b/source4/libcli/util/asn1.c
index 7025808a1e..7e313bcd4a 100644
--- a/source4/libcli/util/asn1.c
+++ b/source4/libcli/util/asn1.c
@@ -107,23 +107,59 @@ BOOL asn1_pop_tag(ASN1_DATA *data)
return True;
}
-static void push_int_bigendian(ASN1_DATA *data, int i)
+/* "i" is the one's complement representation, as is the normal result of an
+ * implicit signed->unsigned conversion */
+
+static void push_int_bigendian(ASN1_DATA *data, unsigned int i, BOOL negative)
{
uint8_t lowest = i & 0xFF;
i = i >> 8;
if (i != 0)
- push_int_bigendian(data, i);
+ push_int_bigendian(data, i, negative);
+
+ if (data->nesting->start+1 == data->ofs) {
+
+ /* We did not write anything yet, looking at the highest
+ * valued byte */
+
+ if (negative) {
+ /* Don't write leading 0xff's */
+ if (lowest == 0xFF)
+ return;
+
+ if ((lowest & 0x80) == 0) {
+ /* The only exception for a leading 0xff is if
+ * the highest bit is 0, which would indicate
+ * a positive value */
+ asn1_write_uint8(data, 0xff);
+ }
+ } else {
+ if (lowest & 0x80) {
+ /* The highest bit of a positive integer is 1,
+ * this would indicate a negative number. Push
+ * a 0 to indicate a positive one */
+ asn1_write_uint8(data, 0);
+ }
+ }
+ }
asn1_write_uint8(data, lowest);
}
-
/* write an integer */
BOOL asn1_write_Integer(ASN1_DATA *data, int i)
{
if (!asn1_push_tag(data, ASN1_INTEGER)) return False;
- push_int_bigendian(data, i);
+ if (i == -1) {
+ /* -1 is special as it consists of all-0xff bytes. In
+ push_int_bigendian this is the only case that is not
+ properly handled, as all 0xff bytes would be handled as
+ leading ones to be ignored. */
+ asn1_write_uint8(data, 0xff);
+ } else {
+ push_int_bigendian(data, i, i<0);
+ }
return asn1_pop_tag(data);
}