mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-17 21:22:10 +00:00
312 lines
9.3 KiB
C
312 lines
9.3 KiB
C
/**
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* Copyright (c) SatoshiLabs
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdbool.h>
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#include <string.h>
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#include "memzero.h"
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#include "sha2.h"
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#include "zkp_context.h"
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#include "vendor/secp256k1-zkp/include/secp256k1.h"
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#include "vendor/secp256k1-zkp/include/secp256k1_extrakeys.h"
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#include "vendor/secp256k1-zkp/include/secp256k1_schnorrsig.h"
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#include "zkp_bip340.h"
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// Initial hash value H for SHA-256 TapTweak:
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const uint32_t sha256_initial_taptweak_state[8] = {
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0xd129a2f3UL, 0x701c655dUL, 0x6583b6c3UL, 0xb9419727UL,
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0x95f4e232UL, 0x94fd54f4UL, 0xa2ae8d85UL, 0x47ca590bUL,
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};
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// BIP340 Schnorr public key derivation
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// private_key_bytes has 32 bytes
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// public_key_bytes has 32 bytes
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// returns 0 on success
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int zkp_bip340_get_public_key(const uint8_t *private_key_bytes,
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uint8_t *public_key_bytes) {
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int result = 0;
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secp256k1_pubkey pubkey = {0};
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if (result == 0) {
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secp256k1_context *context_writable = zkp_context_acquire_writable();
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if (context_writable) {
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secp256k1_context_writable_randomize(context_writable);
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if (secp256k1_ec_pubkey_create(context_writable, &pubkey,
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private_key_bytes) != 1) {
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result = -1;
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}
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zkp_context_release_writable();
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} else {
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result = -1;
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}
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}
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secp256k1_xonly_pubkey xonly_pubkey = {0};
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const secp256k1_context *context_read_only = zkp_context_get_read_only();
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if (result == 0) {
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if (secp256k1_xonly_pubkey_from_pubkey(context_read_only, &xonly_pubkey,
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NULL, &pubkey) != 1) {
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result = -1;
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}
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}
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memzero(&pubkey, sizeof(pubkey));
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if (result == 0) {
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if (secp256k1_xonly_pubkey_serialize(context_read_only, public_key_bytes,
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&xonly_pubkey) != 1) {
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result = -1;
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}
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}
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memzero(&xonly_pubkey, sizeof(xonly_pubkey));
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return result;
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}
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// BIP340 Schnorr signature signing
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// private_key_bytes has 32 bytes
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// digest has 32 bytes
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// signature_bytes has 64 bytes
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// auxiliary_data has 32 bytes or is NULL
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// returns 0 on success
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int zkp_bip340_sign_digest(const uint8_t *private_key_bytes,
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const uint8_t *digest, uint8_t *signature_bytes,
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uint8_t *auxiliary_data) {
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int result = 0;
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secp256k1_keypair keypair = {0};
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if (result == 0) {
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secp256k1_context *context_writable = zkp_context_acquire_writable();
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if (context_writable) {
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secp256k1_context_writable_randomize(context_writable);
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if (secp256k1_keypair_create(context_writable, &keypair,
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private_key_bytes) != 1) {
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result = -1;
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}
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zkp_context_release_writable();
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} else {
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result = -1;
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}
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}
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if (result == 0) {
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secp256k1_context *context_writable = zkp_context_acquire_writable();
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if (context_writable) {
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secp256k1_context_writable_randomize(context_writable);
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if (secp256k1_schnorrsig_sign(context_writable, signature_bytes, digest,
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&keypair, auxiliary_data) != 1) {
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result = -1;
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}
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zkp_context_release_writable();
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} else {
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result = -1;
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}
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}
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memzero(&keypair, sizeof(keypair));
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return result;
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}
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// BIP340 Schnorr signature verification
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// public_key_bytes has 32 bytes
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// signature_bytes has 64 bytes
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// digest has 32 bytes
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// returns 0 if verification succeeded
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int zkp_bip340_verify_digest(const uint8_t *public_key_bytes,
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const uint8_t *signature_bytes,
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const uint8_t *digest) {
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int result = 0;
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secp256k1_xonly_pubkey xonly_pubkey = {0};
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const secp256k1_context *context_read_only = zkp_context_get_read_only();
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if (result == 0) {
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if (secp256k1_xonly_pubkey_parse(context_read_only, &xonly_pubkey,
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public_key_bytes) != 1) {
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result = 1;
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}
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}
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if (result == 0) {
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if (secp256k1_schnorrsig_verify(context_read_only, signature_bytes, digest,
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32, &xonly_pubkey) != 1) {
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result = 5;
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}
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}
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memzero(&xonly_pubkey, sizeof(xonly_pubkey));
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return result;
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}
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// BIP340 Schnorr public key tweak
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// internal_public_key has 32 bytes
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// root_hash has 32 bytes or is empty (NULL)
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// output_public_key has 32 bytes
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// returns 0 on success
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int zkp_bip340_tweak_public_key(const uint8_t *internal_public_key,
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const uint8_t *root_hash,
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uint8_t *output_public_key) {
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int result = 0;
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uint8_t tweak[SHA256_DIGEST_LENGTH] = {0};
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if (result == 0) {
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SHA256_CTX ctx = {0};
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sha256_Init_ex(&ctx, sha256_initial_taptweak_state, 512);
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sha256_Update(&ctx, internal_public_key, 32);
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if (root_hash != NULL) {
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sha256_Update(&ctx, root_hash, 32);
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}
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sha256_Final(&ctx, tweak);
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}
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const secp256k1_context *context_read_only = zkp_context_get_read_only();
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secp256k1_xonly_pubkey internal_pubkey = {0};
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if (result == 0) {
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if (secp256k1_xonly_pubkey_parse(context_read_only, &internal_pubkey,
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internal_public_key) != 1) {
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result = -1;
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}
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}
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secp256k1_pubkey output_pubkey = {0};
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if (result == 0) {
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if (secp256k1_xonly_pubkey_tweak_add(context_read_only, &output_pubkey,
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&internal_pubkey, tweak) != 1) {
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result = -1;
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}
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}
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memzero(tweak, sizeof(tweak));
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memzero(&internal_pubkey, sizeof(internal_pubkey));
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secp256k1_xonly_pubkey xonly_output_pubkey = {0};
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if (result == 0) {
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if (secp256k1_xonly_pubkey_from_pubkey(context_read_only,
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&xonly_output_pubkey, NULL,
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&output_pubkey) != 1) {
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result = -1;
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}
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}
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memzero(&output_pubkey, sizeof(output_pubkey));
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if (result == 0) {
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if (secp256k1_xonly_pubkey_serialize(context_read_only, output_public_key,
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&xonly_output_pubkey) != 1) {
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result = -1;
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}
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}
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memzero(&xonly_output_pubkey, sizeof(xonly_output_pubkey));
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return result;
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}
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// BIP340 Schnorr private key tweak
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// internal_private_key has 32 bytes
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// root_hash has 32 bytes or is empty (NULL)
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// output_private_key has 32 bytes
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// returns 0 on success
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int zkp_bip340_tweak_private_key(const uint8_t *internal_private_key,
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const uint8_t *root_hash,
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uint8_t *output_private_key) {
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int result = 0;
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secp256k1_keypair keypair = {0};
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if (result == 0) {
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secp256k1_context *context_writable = zkp_context_acquire_writable();
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if (context_writable) {
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secp256k1_context_writable_randomize(context_writable);
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if (secp256k1_keypair_create(context_writable, &keypair,
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internal_private_key) != 1) {
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result = -1;
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}
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zkp_context_release_writable();
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} else {
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result = -1;
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}
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}
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const secp256k1_context *context_read_only = zkp_context_get_read_only();
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secp256k1_xonly_pubkey internal_xonly_pubkey = {0};
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if (result == 0) {
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if (secp256k1_keypair_xonly_pub(context_read_only, &internal_xonly_pubkey,
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NULL, &keypair) != 1) {
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result = -1;
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}
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}
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uint8_t internal_public_key[32] = {0};
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if (result == 0) {
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if (secp256k1_xonly_pubkey_serialize(context_read_only, internal_public_key,
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&internal_xonly_pubkey) != 1) {
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result = -1;
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}
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}
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memzero(&internal_xonly_pubkey, sizeof(internal_xonly_pubkey));
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uint8_t tweak[SHA256_DIGEST_LENGTH] = {0};
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if (result == 0) {
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SHA256_CTX ctx = {0};
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sha256_Init_ex(&ctx, sha256_initial_taptweak_state, 512);
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sha256_Update(&ctx, internal_public_key, 32);
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if (root_hash != NULL) {
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sha256_Update(&ctx, root_hash, 32);
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}
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sha256_Final(&ctx, tweak);
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}
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memzero(&internal_public_key, sizeof(internal_public_key));
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if (result == 0) {
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if (secp256k1_keypair_xonly_tweak_add(context_read_only, &keypair, tweak) !=
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1) {
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result = -1;
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}
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}
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memzero(tweak, sizeof(tweak));
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if (result == 0) {
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if (secp256k1_keypair_sec(context_read_only, output_private_key,
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&keypair) != 1) {
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result = -1;
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}
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}
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memzero(&keypair, sizeof(keypair));
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return result;
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}
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