mirror of https://github.com/bitcoin/bitcoin
49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/***********************************************************************
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* Copyright (c) 2013, 2014 Pieter Wuille *
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* Distributed under the MIT software license, see the accompanying *
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* file COPYING or https://www.opensource.org/licenses/mit-license.php.*
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***********************************************************************/
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#ifndef SECP256K1_ECMULT_GEN_H
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#define SECP256K1_ECMULT_GEN_H
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#include "scalar.h"
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#include "group.h"
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#ifndef ECMULT_GEN_PREC_BITS
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# define ECMULT_GEN_PREC_BITS 4
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# ifdef DEBUG_CONFIG
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# pragma message DEBUG_CONFIG_MSG("ECMULT_GEN_PREC_BITS undefined, assuming default value")
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# endif
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#endif
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#ifdef DEBUG_CONFIG
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# pragma message DEBUG_CONFIG_DEF(ECMULT_GEN_PREC_BITS)
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#endif
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#if ECMULT_GEN_PREC_BITS != 2 && ECMULT_GEN_PREC_BITS != 4 && ECMULT_GEN_PREC_BITS != 8
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# error "Set ECMULT_GEN_PREC_BITS to 2, 4 or 8."
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#endif
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#define ECMULT_GEN_PREC_G(bits) (1 << bits)
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#define ECMULT_GEN_PREC_N(bits) (256 / bits)
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typedef struct {
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/* Whether the context has been built. */
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int built;
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/* Blinding values used when computing (n-b)G + bG. */
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secp256k1_scalar blind; /* -b */
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secp256k1_gej initial; /* bG */
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} secp256k1_ecmult_gen_context;
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static void secp256k1_ecmult_gen_context_build(secp256k1_ecmult_gen_context* ctx);
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static void secp256k1_ecmult_gen_context_clear(secp256k1_ecmult_gen_context* ctx);
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/** Multiply with the generator: R = a*G */
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static void secp256k1_ecmult_gen(const secp256k1_ecmult_gen_context* ctx, secp256k1_gej *r, const secp256k1_scalar *a);
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static void secp256k1_ecmult_gen_blind(secp256k1_ecmult_gen_context *ctx, const unsigned char *seed32);
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#endif /* SECP256K1_ECMULT_GEN_H */
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