ecmult.h File Reference

#include "group.h"
#include "scalar.h"
#include "scratch.h"

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Classes
struct	secp256k1_ecmult_context

Typedefs
typedef int()	secp256k1_ecmult_multi_callback(secp256k1_scalar *sc, secp256k1_ge *pt, size_t idx, void *data)

Functions
static void	secp256k1_ecmult_context_init (secp256k1_ecmult_context *ctx)
static void	secp256k1_ecmult_context_build (secp256k1_ecmult_context *ctx, void **prealloc)
static void	secp256k1_ecmult_context_finalize_memcpy (secp256k1_ecmult_context *dst, const secp256k1_ecmult_context *src)
static void	secp256k1_ecmult_context_clear (secp256k1_ecmult_context *ctx)
static int	secp256k1_ecmult_context_is_built (const secp256k1_ecmult_context *ctx)
static void	secp256k1_ecmult (const secp256k1_ecmult_context *ctx, secp256k1_gej *r, const secp256k1_gej *a, const secp256k1_scalar *na, const secp256k1_scalar *ng)
	Double multiply: R = na*A + ng*G.
static int	secp256k1_ecmult_multi_var (const secp256k1_callback *error_callback, const secp256k1_ecmult_context *ctx, secp256k1_scratch *scratch, secp256k1_gej *r, const secp256k1_scalar *inp_g_sc, secp256k1_ecmult_multi_callback cb, void *cbdata, size_t n)
	Multi-multiply: R = inp_g_sc * G + sum_i ni * Ai.

Typedef Documentation

secp256k1_ecmult_multi_callback

typedef int() secp256k1_ecmult_multi_callback(secp256k1_scalar *sc, secp256k1_ge *pt, size_t idx, void *data)

Definition at line 29 of file ecmult.h.

Function Documentation

secp256k1_ecmult()

static void secp256k1_ecmult ( const secp256k1_ecmult_context *  ctx, secp256k1_gej *  r, const secp256k1_gej *  a, const secp256k1_scalar *  na, const secp256k1_scalar *  ng  )

static

Double multiply: R = na*A + ng*G.

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secp256k1_ecmult_context_build()

static void secp256k1_ecmult_context_build ( secp256k1_ecmult_context *  ctx, void **  prealloc  )

static

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secp256k1_ecmult_context_clear()

static void secp256k1_ecmult_context_clear ( secp256k1_ecmult_context *  ctx )

static

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secp256k1_ecmult_context_finalize_memcpy()

static void secp256k1_ecmult_context_finalize_memcpy ( secp256k1_ecmult_context *  dst, const secp256k1_ecmult_context *  src  )

static

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secp256k1_ecmult_context_init()

static void secp256k1_ecmult_context_init ( secp256k1_ecmult_context *  ctx )

static

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secp256k1_ecmult_context_is_built()

static int secp256k1_ecmult_context_is_built ( const secp256k1_ecmult_context *  ctx )

static

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secp256k1_ecmult_multi_var()

static int secp256k1_ecmult_multi_var ( const secp256k1_callback *  error_callback, const secp256k1_ecmult_context *  ctx, secp256k1_scratch *  scratch, secp256k1_gej *  r, const secp256k1_scalar *  inp_g_sc, secp256k1_ecmult_multi_callback  cb, void *  cbdata, size_t  n  )

static

Multi-multiply: R = inp_g_sc * G + sum_i ni * Ai.

Chooses the right algorithm for a given number of points and scratch space size. Resets and overwrites the given scratch space. If the points do not fit in the scratch space the algorithm is repeatedly run with batches of points. If no scratch space is given then a simple algorithm is used that simply multiplies the points with the corresponding scalars and adds them up. Returns: 1 on success (including when inp_g_sc is NULL and n is 0) 0 if there is not enough scratch space for a single point or callback returns 0

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