git / moonbite-core / src/secp256k1-zkp/src/eckey_impl.h · raw

/********************************************************************** * Copyright (c) 2013, 2014 Pieter Wuille                             * * Distributed under the MIT software license, see the accompanying   * * file COPYING or http://www.opensource.org/licenses/mit-license.php.* **********************************************************************/#ifndef SECP256K1_ECKEY_IMPL_H#define SECP256K1_ECKEY_IMPL_H#include "eckey.h"#include "scalar.h"#include "field.h"#include "group.h"#include "ecmult_gen.h"static int secp256k1_eckey_pubkey_parse(secp256k1_ge *elem, const unsigned char *pub, size_t size) {    if (size == 33 && (pub[0] == SECP256K1_TAG_PUBKEY_EVEN || pub[0] == SECP256K1_TAG_PUBKEY_ODD)) {        secp256k1_fe x;        return secp256k1_fe_set_b32(&x, pub+1) && secp256k1_ge_set_xo_var(elem, &x, pub[0] == SECP256K1_TAG_PUBKEY_ODD);    } else if (size == 65 && (pub[0] == 0x04 || pub[0] == 0x06 || pub[0] == 0x07)) {        secp256k1_fe x, y;        if (!secp256k1_fe_set_b32(&x, pub+1) || !secp256k1_fe_set_b32(&y, pub+33)) {            return 0;        }        secp256k1_ge_set_xy(elem, &x, &y);        if ((pub[0] == SECP256K1_TAG_PUBKEY_HYBRID_EVEN || pub[0] == SECP256K1_TAG_PUBKEY_HYBRID_ODD) &&            secp256k1_fe_is_odd(&y) != (pub[0] == SECP256K1_TAG_PUBKEY_HYBRID_ODD)) {            return 0;        }        return secp256k1_ge_is_valid_var(elem);    } else {        return 0;    }}static int secp256k1_eckey_pubkey_serialize(secp256k1_ge *elem, unsigned char *pub, size_t *size, int compressed) {    if (secp256k1_ge_is_infinity(elem)) {        return 0;    }    secp256k1_fe_normalize_var(&elem->x);    secp256k1_fe_normalize_var(&elem->y);    secp256k1_fe_get_b32(&pub[1], &elem->x);    if (compressed) {        *size = 33;        pub[0] = secp256k1_fe_is_odd(&elem->y) ? SECP256K1_TAG_PUBKEY_ODD : SECP256K1_TAG_PUBKEY_EVEN;    } else {        *size = 65;        pub[0] = SECP256K1_TAG_PUBKEY_UNCOMPRESSED;        secp256k1_fe_get_b32(&pub[33], &elem->y);    }    return 1;}static int secp256k1_eckey_privkey_tweak_add(secp256k1_scalar *key, const secp256k1_scalar *tweak) {    secp256k1_scalar_add(key, key, tweak);    if (secp256k1_scalar_is_zero(key)) {        return 0;    }    return 1;}static int secp256k1_eckey_pubkey_tweak_add(const secp256k1_ecmult_context *ctx, secp256k1_ge *key, const secp256k1_scalar *tweak) {    secp256k1_gej pt;    secp256k1_scalar one;    secp256k1_gej_set_ge(&pt, key);    secp256k1_scalar_set_int(&one, 1);    secp256k1_ecmult(ctx, &pt, &pt, &one, tweak);    if (secp256k1_gej_is_infinity(&pt)) {        return 0;    }    secp256k1_ge_set_gej(key, &pt);    return 1;}static int secp256k1_eckey_privkey_tweak_mul(secp256k1_scalar *key, const secp256k1_scalar *tweak) {    if (secp256k1_scalar_is_zero(tweak)) {        return 0;    }    secp256k1_scalar_mul(key, key, tweak);    return 1;}static int secp256k1_eckey_pubkey_tweak_mul(const secp256k1_ecmult_context *ctx, secp256k1_ge *key, const secp256k1_scalar *tweak) {    secp256k1_scalar zero;    secp256k1_gej pt;    if (secp256k1_scalar_is_zero(tweak)) {        return 0;    }    secp256k1_scalar_set_int(&zero, 0);    secp256k1_gej_set_ge(&pt, key);    secp256k1_ecmult(ctx, &pt, &pt, tweak, &zero);    secp256k1_ge_set_gej(key, &pt);    return 1;}#endif /* SECP256K1_ECKEY_IMPL_H */