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cobuild.c
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cobuild.c
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/**
This is an implementation in C of cobuild. See reference implementation in Rust:
https://github.com/cryptape/ckb-transaction-cobuild-poc/blob/main/ckb-transaction-cobuild/src/lib.rs
*/
// clang-format off
#define CKB_DECLARATION_ONLY
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#define MOLECULEC_C2_DECLARATION_ONLY
#define MOLECULEC2_VERSION 6001
#define MOLECULE2_API_VERSION_MIN 5000
#include "cobuild.h"
#include "molecule2_reader.h"
#include "blake2b_decl_only.h"
#include "ckb_consts.h"
#include "ckb_syscall_apis.h"
// clang-format on
#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
#define BLAKE2B_BLOCK_SIZE 32
#define CHECK2(cond, code) \
do { \
if (!(cond)) { \
printf("error at %s:%d, error code %d", __FILE__, __LINE__, code); \
err = code; \
ASSERT(0); \
goto exit; \
} \
} while (0)
#define CHECK(_code) \
do { \
int code = (_code); \
if (code != 0) { \
printf("error at %s:%d, error code %d", __FILE__, __LINE__, code); \
err = code; \
ASSERT(0); \
goto exit; \
} \
} while (0)
enum CobuildErrorCode {
// cobuild error code is from 110
ERROR_GENERAL = 110,
ERROR_HASH,
ERROR_NONEMPTY_WITNESS,
ERROR_SIGHASHALL_DUP,
ERROR_SIGHASHALL_NOSEAL,
};
enum WitnessLayoutId {
WitnessLayoutSighashAll = 4278190081,
WitnessLayoutSighashAllOnly = 4278190082,
WitnessLayoutOtx = 4278190083,
WitnessLayoutOtxStart = 4278190084,
};
const char *PERSONAL_SIGHASH_ALL = "ckb-tcob-sighash";
const char *PERSONAL_SIGHASH_ALL_ONLY = "ckb-tcob-sgohash";
const char *PERSONAL_OTX = "ckb-tcob-otxhash";
/*
The seal cursor uses this data source. So the lifetime of data source should
be long enough.
*/
static uint8_t g_cobuild_seal_data_source[DEFAULT_DATA_SOURCE_LENGTH];
#ifdef CKB_C_STDLIB_PRINTF
static void bin_to_hex(const uint8_t *source, uint8_t *dest, size_t len) {
const static uint8_t HEX_TABLE[] = {'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
for (int i = 0; i < len; i++) {
dest[i * 2] = HEX_TABLE[source[i] >> 4];
dest[i * 2 + 1] = HEX_TABLE[source[i] & 0x0F];
}
}
void print_raw_data(const char *name, uint8_t *data, size_t len) {
uint8_t str[924] = {0};
const int limit = (sizeof(str) - 1) / 2;
if (len > limit) {
printf("The data length (%d) is too long, truncated to %d", len, limit);
len = limit;
}
bin_to_hex(data, str, len);
printf("%s(len=%d): %s", name, len, str);
}
void print_cursor(const char *name, mol2_cursor_t cursor) {
uint8_t data[256] = {0};
uint32_t read_len = mol2_read_at(&cursor, data, sizeof(data));
if (read_len >= sizeof(data)) {
printf("the cursor length (%d) is too long, truncated to %d", cursor.size,
read_len);
}
print_raw_data(name, data, MIN(read_len, sizeof(data)));
}
// After being enabled, there will be a lot of logs.
#define BLAKE2B_UPDATE blake2b_update_debug
// #define BLAKE2B_UPDATE blake2b_update
int blake2b_update_debug(blake2b_state *S, const void *pin, size_t inlen) {
blake2b_update(S, pin, inlen);
print_raw_data("blake2b_update: ", (uint8_t *)pin, inlen);
return 0;
}
#else
void print_raw_data(const char *name, uint8_t *data, size_t len) {}
void print_cursor(const char *name, mol2_cursor_t cursor) {}
#define BLAKE2B_UPDATE blake2b_update
#endif
static void store32(void *dst, uint32_t w) {
uint8_t *p = (uint8_t *)dst;
p[0] = (uint8_t)(w >> 0);
p[1] = (uint8_t)(w >> 8);
p[2] = (uint8_t)(w >> 16);
p[3] = (uint8_t)(w >> 24);
}
int ckb_blake2b_init_personal(blake2b_state *S, size_t outlen,
const char *personal) {
blake2b_param P[1];
if ((!outlen) || (outlen > BLAKE2B_OUTBYTES)) return -1;
P->digest_length = (uint8_t)outlen;
P->key_length = 0;
P->fanout = 1;
P->depth = 1;
store32(&P->leaf_length, 0);
store32(&P->node_offset, 0);
store32(&P->xof_length, 0);
P->node_depth = 0;
P->inner_length = 0;
memset(P->reserved, 0, sizeof(P->reserved));
memset(P->salt, 0, sizeof(P->salt));
memset(P->personal, 0, sizeof(P->personal));
for (int i = 0; i < BLAKE2B_PERSONALBYTES; ++i) {
(P->personal)[i] = personal[i];
}
return blake2b_init_param(S, P);
}
int new_sighash_all_blake2b(blake2b_state *S) {
return ckb_blake2b_init_personal(S, 32, PERSONAL_SIGHASH_ALL);
}
int new_sighash_all_only_blake2b(blake2b_state *S) {
return ckb_blake2b_init_personal(S, 32, PERSONAL_SIGHASH_ALL_ONLY);
}
int new_otx_blake2b(blake2b_state *S) {
return ckb_blake2b_init_personal(S, 32, PERSONAL_OTX);
}
// for lock script with message, the other witness in script group except first
// one should be empty
int ckb_check_others_in_group() {
int err = ERROR_GENERAL;
for (size_t index = 1;; index++) {
uint64_t witness_len = 0;
err = ckb_load_witness(0, &witness_len, 0, index, CKB_SOURCE_GROUP_INPUT);
if (err == CKB_INDEX_OUT_OF_BOUND) {
err = CKB_SUCCESS;
break;
}
CHECK(err);
// tested by test_non_empty_witness
CHECK2(witness_len == 0, ERROR_NONEMPTY_WITNESS);
}
exit:
return err;
}
typedef uint32_t(read_from_t)(uintptr_t arg[], uint8_t *ptr, uint32_t len,
uint32_t offset);
static uint32_t read_from_witness(uintptr_t arg[], uint8_t *ptr, uint32_t len,
uint32_t offset) {
int err = ERROR_GENERAL;
uint64_t output_len = len;
err = ckb_load_witness(ptr, &output_len, offset, arg[0], arg[1]);
if (err != 0) {
return 0;
}
if (output_len > len) {
return len;
} else {
return (uint32_t)output_len;
}
}
static uint32_t read_from_cell_data(uintptr_t arg[], uint8_t *ptr, uint32_t len,
uint32_t offset) {
int err;
uint64_t output_len = len;
err = ckb_load_cell_data(ptr, &output_len, offset, arg[0], arg[1]);
if (err != 0) {
return 0;
}
if (output_len > len) {
return len;
} else {
return (uint32_t)output_len;
}
}
void ckb_new_cursor(mol2_cursor_t *cursor, uint32_t total_len,
read_from_t read_from, uint8_t *data_source,
uint32_t cache_len, size_t index, size_t source) {
cursor->offset = 0;
cursor->size = (uint32_t)total_len;
mol2_data_source_t *ptr = (mol2_data_source_t *)data_source;
ptr->read = read_from;
ptr->total_size = total_len;
ptr->args[0] = index;
ptr->args[1] = source;
ptr->cache_size = 0;
ptr->start_point = 0;
ptr->max_cache_size = cache_len;
cursor->data_source = ptr;
}
int ckb_new_witness_cursor(mol2_cursor_t *cursor, uint8_t *data_source,
uint32_t cache_len, size_t index, size_t source) {
int err = ERROR_GENERAL;
uint64_t len = 0;
err = ckb_load_witness(0, &len, 0, index, source);
CHECK(err);
ckb_new_cursor(cursor, len, read_from_witness, data_source, cache_len, index,
source);
exit:
return err;
}
int ckb_hash_cursor(blake2b_state *ctx, mol2_cursor_t cursor) {
// one batch to drain whole cache perfectly
// tested by test_input_cell_data_size_0
// test_input_cell_data_size_1
// test_input_cell_data_size_2048
// test_input_cell_data_size_2049
// test_input_cell_data_size_500k
uint8_t batch[MAX_CACHE_SIZE];
while (true) {
uint32_t read_len = mol2_read_at(&cursor, batch, sizeof(batch));
BLAKE2B_UPDATE(ctx, batch, read_len);
// adjust cursor
mol2_add_offset(&cursor, read_len);
mol2_sub_size(&cursor, read_len);
mol2_validate(&cursor);
if (cursor.size == 0) {
break;
}
}
return 0;
}
static uint32_t try_union_unpack_id(const mol2_cursor_t *cursor, uint32_t *id) {
uint32_t len = mol2_read_at(cursor, (uint8_t *)id, 4);
if (len != 4) {
// tested by:
// tested_by_no_cobuild_append_sighash_all
// tested_by_insert_witness_less_4_before_sighashall
return MOL2_ERR_DATA;
}
return CKB_SUCCESS;
}
int ckb_fetch_message(bool *has_message, mol2_cursor_t *message_cursor,
uint8_t *data_source, size_t cache_len) {
int err = ERROR_GENERAL;
*has_message = false;
for (size_t index = 0;; index++) {
uint32_t id = 0;
uint64_t len = sizeof(id);
err = ckb_load_witness(&id, &len, 0, index, CKB_SOURCE_INPUT);
if (err == CKB_INDEX_OUT_OF_BOUND) {
err = 0;
break;
}
CHECK(err);
if (len >= sizeof(id) && id == WitnessLayoutSighashAll) {
// tested by:
// tested_by_sighashall_dup
CHECK2(!*has_message, ERROR_SIGHASHALL_DUP);
*has_message = true;
mol2_cursor_t cursor = {0};
err = ckb_new_witness_cursor(&cursor, data_source, cache_len, index,
CKB_SOURCE_INPUT);
CHECK(err);
mol2_union_t uni = mol2_union_unpack(&cursor);
/* See molecule defintion, the index is 0:
table SighashAll {
message: Message,
seal: Bytes,
}
*/
*message_cursor = mol2_table_slice_by_index(&uni.cursor, 0);
} else {
// there are some possibilities:
// 1. an invalid witness (e.g. empty)
// 2. WitnessArgs
// 3. Other cobuild WitnessLayout(e.g. SighashAllOnly)
// tested by:
// tested_by_append_witnessed_less_than_4
// tested_by_append_witnessargs
// tested_by_append_other_witnesslayout
}
}
exit:
return err;
}
int ckb_fetch_seal(mol2_cursor_t *seal_cursor) {
int err = ERROR_GENERAL;
mol2_cursor_t cursor;
err = ckb_new_witness_cursor(&cursor, g_cobuild_seal_data_source,
MAX_CACHE_SIZE, 0, CKB_SOURCE_GROUP_INPUT);
CHECK(err);
uint32_t id = 0;
err = try_union_unpack_id(&cursor, &id);
// when error occurs here, it might be a WitnessArgs layout. It shouldn't be
// cobuild and returns early.
CHECK(err);
if (id == WitnessLayoutSighashAll) {
mol2_union_t uni = mol2_union_unpack(&cursor);
/* See molecule defintion, the index is 1:
table SighashAll {
message: Message,
seal: Bytes,
}
*/
*seal_cursor = mol2_table_slice_by_index(&uni.cursor, 1);
} else if (id == WitnessLayoutSighashAllOnly) {
/* See molecule defintion, the index is 0:
table SighashAllOnly {
seal: Bytes,
}
tested by test_sighash_all_only
*/
mol2_union_t uni = mol2_union_unpack(&cursor);
*seal_cursor = mol2_table_slice_by_index(&uni.cursor, 0);
} else {
// the union id should be SighashAll or SighashAllOnly. otherwise, it fails
// and mark it as non cobuild.
// tested by test_wrong_union_id
printf("error in fetch_seal, id = %u", id);
CHECK2(false, ERROR_SIGHASHALL_NOSEAL);
}
exit:
return err;
}
int ckb_generate_signing_message_hash(bool has_message,
mol2_cursor_t message_cursor,
uint8_t *signing_message_hash) {
int err = 0;
// this data source is on stack. When this function returns, all cursors bound
// to this buffer become invalid.
uint8_t data_source[DEFAULT_DATA_SOURCE_LENGTH];
blake2b_state ctx;
size_t count = 0;
// use different hash based on message
if (has_message) {
// tested by test_input_cell_data_size_0
new_sighash_all_blake2b(&ctx);
ckb_hash_cursor(&ctx, message_cursor);
count += message_cursor.size;
} else {
// tested by:
// tested_by_no_has_message
new_sighash_all_only_blake2b(&ctx);
}
// hash tx hash
uint8_t tx_hash[BLAKE2B_BLOCK_SIZE];
uint64_t tx_hash_len = sizeof(tx_hash);
err = ckb_load_tx_hash(tx_hash, &tx_hash_len, 0);
CHECK(err);
BLAKE2B_UPDATE(&ctx, tx_hash, sizeof(tx_hash));
count += 32;
// hash input cell and data
size_t index = 0;
for (;; index++) {
// default input size is 44 bytes
uint8_t input[128];
uint64_t input_len = sizeof(input);
err = ckb_load_input(input, &input_len, 0, index, CKB_SOURCE_INPUT);
if (err == CKB_INDEX_OUT_OF_BOUND) {
err = 0;
break;
}
CHECK(err);
BLAKE2B_UPDATE(&ctx, input, input_len);
count += input_len;
uint64_t cell_data_len = 0;
err = ckb_load_cell_data(0, &cell_data_len, 0, index, CKB_SOURCE_INPUT);
CHECK(err);
mol2_cursor_t cell_data_cursor;
ckb_new_cursor(&cell_data_cursor, cell_data_len, read_from_cell_data,
data_source, MAX_CACHE_SIZE, index, CKB_SOURCE_INPUT);
// only hash as uint32_t. 4 bytes is enough
BLAKE2B_UPDATE(&ctx, &cell_data_len, 4);
count += 4;
err = ckb_hash_cursor(&ctx, cell_data_cursor);
count += cell_data_cursor.size;
CHECK(err);
}
size_t input_len = index;
// hash remaining witnesses
for (size_t index = input_len;; index++) {
uint64_t witness_len = 0;
err = ckb_load_witness(0, &witness_len, 0, index, CKB_SOURCE_INPUT);
if (err == CKB_INDEX_OUT_OF_BOUND) {
err = 0;
break;
}
CHECK(err);
mol2_cursor_t witness_cursor;
ckb_new_cursor(&witness_cursor, witness_len, read_from_witness, data_source,
MAX_CACHE_SIZE, index, CKB_SOURCE_INPUT);
// only hash as uint32_t. 4 bytes is enough
BLAKE2B_UPDATE(&ctx, &witness_len, 4);
count += 4;
err = ckb_hash_cursor(&ctx, witness_cursor);
count += witness_cursor.size;
CHECK(err);
}
blake2b_final(&ctx, signing_message_hash, BLAKE2B_BLOCK_SIZE);
printf("ckb_generate_signing_message_hash total hashed %d bytes", count);
exit:
return err;
}
int ckb_parse_message(uint8_t *signing_message_hash, mol2_cursor_t *seal) {
int err = ERROR_GENERAL;
err = ckb_check_others_in_group();
// tested by test_non_empty_witness
CHECK(err);
bool has_message = false;
mol2_cursor_t message;
// the message cursor requires longer lifetime of data_source
uint8_t data_source[DEFAULT_DATA_SOURCE_LENGTH];
err = ckb_fetch_message(&has_message, &message, data_source, MAX_CACHE_SIZE);
CHECK(err);
print_cursor("message", message);
err = ckb_generate_signing_message_hash(has_message, message,
signing_message_hash);
CHECK(err);
print_raw_data("signing_message_hash", signing_message_hash, 32);
err = ckb_fetch_seal(seal);
CHECK(err);
print_cursor("seal", *seal);
exit:
return err;
}