Detailed comments for secp256k1_scalar_split_lambda

[secp256k1.git] / src / scalar.h

diff --git a/src/scalar.h b/src/scalar.h
index 95d3e326c9c6f0f6959b90b30f191de988b509eb..ed01c7ec97d680c3b6e6c1c050943cc4985067c4 100644 (file)
--- a/src/scalar.h
+++ b/src/scalar.h
@@ -103,10 +103,11 @@ static void secp256k1_scalar_order_get_num(secp256k1_num *r);
 static int secp256k1_scalar_eq(const secp256k1_scalar *a, const secp256k1_scalar *b);
 
 #ifdef USE_ENDOMORPHISM
-/** Find r1 and r2 such that r1+r2*2^128 = a. */
-static void secp256k1_scalar_split_128(secp256k1_scalar *r1, secp256k1_scalar *r2, const secp256k1_scalar *a);
-/** Find r1 and r2 such that r1+r2*lambda = a, and r1 and r2 are maximum 128 bits long (see secp256k1_gej_mul_lambda). */
-static void secp256k1_scalar_split_lambda(secp256k1_scalar *r1, secp256k1_scalar *r2, const secp256k1_scalar *a);
+/** Find r1 and r2 such that r1+r2*2^128 = k. */
+static void secp256k1_scalar_split_128(secp256k1_scalar *r1, secp256k1_scalar *r2, const secp256k1_scalar *k);
+/** Find r1 and r2 such that r1+r2*lambda = k,
+ * where r1 and r2 or their negations are maximum 128 bits long (see secp256k1_ge_mul_lambda). */
+static void secp256k1_scalar_split_lambda(secp256k1_scalar *r1, secp256k1_scalar *r2, const secp256k1_scalar *k);
 #endif
 
 /** Multiply a and b (without taking the modulus!), divide by 2**shift, and round to the nearest integer. Shift must be at least 256. */