Bitcoin Core  26.99.0
P2P Digital Currency
scalar_low.h
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1 /***********************************************************************
2  * Copyright (c) 2015, 2022 Andrew Poelstra, Pieter Wuille *
3  * Distributed under the MIT software license, see the accompanying *
4  * file COPYING or https://www.opensource.org/licenses/mit-license.php.*
5  ***********************************************************************/
6 
7 #ifndef SECP256K1_SCALAR_REPR_H
8 #define SECP256K1_SCALAR_REPR_H
9 
10 #include <stdint.h>
11 
13 typedef uint32_t secp256k1_scalar;
14 
15 /* A compile-time constant equal to 2^32 (modulo order). */
16 #define SCALAR_2P32 ((0xffffffffUL % EXHAUSTIVE_TEST_ORDER) + 1U)
17 
18 /* Compute a*2^32 + b (modulo order). */
19 #define SCALAR_HORNER(a, b) (((uint64_t)(a) * SCALAR_2P32 + (b)) % EXHAUSTIVE_TEST_ORDER)
20 
21 /* Evaluates to the provided 256-bit constant reduced modulo order. */
22 #define SECP256K1_SCALAR_CONST(d7, d6, d5, d4, d3, d2, d1, d0) SCALAR_HORNER(SCALAR_HORNER(SCALAR_HORNER(SCALAR_HORNER(SCALAR_HORNER(SCALAR_HORNER(SCALAR_HORNER((d7), (d6)), (d5)), (d4)), (d3)), (d2)), (d1)), (d0))
23 
24 #endif /* SECP256K1_SCALAR_REPR_H */
uint32_t secp256k1_scalar
A scalar modulo the group order of the secp256k1 curve.
Definition: scalar_low.h:13