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55 lines
2.1 KiB
C
55 lines
2.1 KiB
C
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// Copyright (c) 2014 Pieter Wuille
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef _SECP256K1_SCALAR_
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#define _SECP256K1_SCALAR_
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#include "num.h"
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/** A scalar modulo the group order of the secp256k1 curve. */
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typedef struct {
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secp256k1_num_t n;
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} secp256k1_scalar_t;
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/** Initialize a scalar. */
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void static secp256k1_scalar_init(secp256k1_scalar_t *r);
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/** Clear a scalar to prevent the leak of sensitive data. */
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void static secp256k1_scalar_clear(secp256k1_scalar_t *r);
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/** Free a scalar. */
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void static secp256k1_scalar_free(secp256k1_scalar_t *r);
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/** Access bits from a scalar. */
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int static secp256k1_scalar_get_bits(const secp256k1_scalar_t *a, int offset, int count);
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/** Set a scalar from a big endian byte array. */
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void static secp256k1_scalar_set_bin(secp256k1_scalar_t *r, const unsigned char *bin, int len, int *overflow);
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/** Convert a scalar to a byte array. */
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void static secp256k1_scalar_get_bin(unsigned char *bin, int len, const secp256k1_scalar_t* a);
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/** Add two scalars together (modulo the group order). */
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void static secp256k1_scalar_add(secp256k1_scalar_t *r, const secp256k1_scalar_t *a, const secp256k1_scalar_t *b);
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/** Multiply two scalars (modulo the group order). */
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void static secp256k1_scalar_mul(secp256k1_scalar_t *r, const secp256k1_scalar_t *a, const secp256k1_scalar_t *b);
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/** Compute the inverse of a scalar (modulo the group order). */
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void static secp256k1_scalar_inverse(secp256k1_scalar_t *r, const secp256k1_scalar_t *a);
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/** Compute the complement of a scalar (modulo the group order). */
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void static secp256k1_scalar_negate(secp256k1_scalar_t *r, const secp256k1_scalar_t *a);
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/** Check whether a scalar equals zero. */
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int static secp256k1_scalar_is_zero(const secp256k1_scalar_t *a);
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/** Check whether a scalar is higher than the group order divided by 2. */
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int static secp256k1_scalar_is_high(const secp256k1_scalar_t *a);
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/** Convert a scalar to a number. */
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void static secp256k1_scalar_get_num(secp256k1_num_t *r, const secp256k1_scalar_t *a);
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#endif
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