- /**XXX should be two's-complement */
- int len;
- u_char *bin = (u_char *)buffer_get_string(buffer, (u_int *)&len);
+ if (buffer_put_bignum2_ret(buffer, value) == -1)
+ fatal("buffer_put_bignum2: buffer error");
+}
+
+int
+buffer_get_bignum2_ret(Buffer *buffer, BIGNUM *value)
+{
+ u_int len;
+ u_char *bin;
+
+ if ((bin = buffer_get_string_ret(buffer, &len)) == NULL) {
+ error("buffer_get_bignum2_ret: invalid bignum");
+ return (-1);
+ }
+
+ if (len > 0 && (bin[0] & 0x80)) {
+ error("buffer_get_bignum2_ret: negative numbers not supported");
+ return (-1);
+ }
+ if (len > 8 * 1024) {
+ error("buffer_get_bignum2_ret: cannot handle BN of size %d", len);
+ return (-1);
+ }