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Merge dashpay#634: Add a descriptive comment for secp256k1_ecmult_const.
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ee9e68c Add a descriptive comment for secp256k1_ecmult_const. (Gregory Maxwell)

Pull request description:

  Helps issue dashpay#633

ACKs for commit ee9e68:

Tree-SHA512: 552bebbd99bf8e8225ef6028e6a3bd188d412977d9c6caa90515041622accd2ea43e320217bf097180343921e967f4627a76c73e4529097bca50be414503e63b
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gmaxwell committed Jun 4, 2019
2 parents d0d738d + ee9e68c commit fa33017
Showing 1 changed file with 5 additions and 2 deletions.
7 changes: 5 additions & 2 deletions src/ecmult_const.h
Original file line number Diff line number Diff line change
Expand Up @@ -10,8 +10,11 @@
#include "scalar.h"
#include "group.h"

/* 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. */
/**
* Multiply: R = q*A (in constant-time)
* 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 */

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