29 lines
2.1 KiB
C
29 lines
2.1 KiB
C
/**********************************************************************
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* Copyright (c) 2020 The libsecp256k1-zkp Developers *
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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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**********************************************************************/
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#ifndef SECP256K1_ECCOMMIT_H
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#define SECP256K1_ECCOMMIT_H
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/** Helper function to add a 32-byte value to a scalar */
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static int secp256k1_ec_seckey_tweak_add_helper(secp256k1_scalar *sec, const unsigned char *tweak);
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/** Helper function to add a 32-byte value, times G, to an EC point */
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static int secp256k1_ec_pubkey_tweak_add_helper(const secp256k1_ecmult_context* ecmult_ctx, secp256k1_ge *p, const unsigned char *tweak);
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/** Serializes elem as a 33 byte array. This is non-constant time with respect to
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* whether pubp is the point at infinity. Thus, you may need to declassify
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* pubp->infinity before calling this function. */
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static int secp256k1_ec_commit_pubkey_serialize_const(secp256k1_ge *pubp, unsigned char *buf33);
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/** Compute an ec commitment tweak as hash(pubkey, data). */
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static int secp256k1_ec_commit_tweak(unsigned char *tweak32, secp256k1_ge* pubp, secp256k1_sha256* sha, const unsigned char *data, size_t data_size);
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/** Compute an ec commitment as pubkey + hash(pubkey, data)*G. */
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static int secp256k1_ec_commit(const secp256k1_ecmult_context* ecmult_ctx, secp256k1_ge* commitp, const secp256k1_ge* pubp, secp256k1_sha256* sha, const unsigned char *data, size_t data_size);
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/** Compute a secret key commitment as seckey + hash(pubkey, data). */
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static int secp256k1_ec_commit_seckey(const secp256k1_ecmult_gen_context* ecmult_gen_ctx, secp256k1_scalar* seckey, secp256k1_ge* pubp, secp256k1_sha256* sha, const unsigned char *data, size_t data_size);
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/** Verify an ec commitment as pubkey + hash(pubkey, data)*G ?= commitment. */
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static int secp256k1_ec_commit_verify(const secp256k1_ecmult_context* ecmult_ctx, const secp256k1_ge* commitp, const secp256k1_ge* pubp, secp256k1_sha256* sha, const unsigned char *data, size_t data_size);
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#endif /* SECP256K1_ECCOMMIT_H */
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