+ uint32_t len;
+ int looks_negative = (d->data[0] & 0x80);
+ unsigned char zero = 0;
+
+ /* if the first bit is 1, then the datum will appear negative in the
+ MPI encoding style used by OpenSSH. In that case, we'll increase
+ the length by one, and dump out one more byte */
+
+ if (looks_negative) {
+ len = htonl(d->size + 1);
+ } else {
+ len = htonl(d->size);
+ }