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Add secp256k1_scalar_half for halving scalars (+ tests/benchmarks).

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Co-authored-by: Jonas Nick <jonasd.nick@gmail.com>
Co-authored-by: Tim Ruffing <crypto@timruffing.de>
This commit is contained in:
Pieter Wuille
2022-12-29 11:48:06 -05:00
parent 1f1bb78b7f
commit 2140da9cd5
6 changed files with 153 additions and 0 deletions
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src/scalar.h
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@@ -67,6 +67,9 @@ static void secp256k1_scalar_inverse_var(secp256k1_scalar *r, const secp256k1_sc
/** Compute the complement of a scalar (modulo the group order). */
static void secp256k1_scalar_negate(secp256k1_scalar *r, const secp256k1_scalar *a);
/** Multiply a scalar with the multiplicative inverse of 2. */
static void secp256k1_scalar_half(secp256k1_scalar *r, const secp256k1_scalar *a);
/** Check whether a scalar equals zero. */
static int secp256k1_scalar_is_zero(const secp256k1_scalar *a);