parameterize ecmult_const over input size

2018-03-13 16:32:51 +00:00
parent dbc3ddd5e2
commit 7c1b91ba4b
7 changed files with 78 additions and 49 deletions
--- a/src/ecmult_const.h
+++ b/src/ecmult_const.h
@@ -10,6 +10,8 @@
 #include "scalar.h"
 #include "group.h"

-static void secp256k1_ecmult_const(secp256k1_gej *r, const secp256k1_ge *a, const secp256k1_scalar *q);
+/* Here `bits` should be set to the maximum bitlength of the _absolute value_ of `q`, plus
+ * one because we internally sometimes add 2 to the number during the WNAF conversion. */
+static void secp256k1_ecmult_const(secp256k1_gej *r, const secp256k1_ge *a, const secp256k1_scalar *q, int bits);

 #endif /* SECP256K1_ECMULT_CONST_H */