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refactor(legacy): deduplicate bigint256 parsing in ethereum.c

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Roman Zeyde 2025-04-20 12:13:48 +03:00 committed by Roman Zeyde
parent 08a918a008
commit c4a916e5fc
1 changed files with 14 additions and 21 deletions
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35
legacy/firmware/ethereum.c
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@ -331,14 +331,19 @@ static void ethereumFormatAmount(const bignum256 *amnt,
bn_format(amnt, NULL, suffix, decimals, 0, false, ',', buf, buflen);
}
static void parse_bignum256(const uint8_t *value, uint32_t value_len,
bignum256 *result) {
uint8_t padded[32] = {0};
memzero(padded, sizeof(padded));
memcpy(padded + (32 - value_len), value, value_len);
bn_read_be(padded, result);
}
static void layoutEthereumConfirmTx(const uint8_t *to, uint32_t to_len,
const uint8_t *value, uint32_t value_len,
const EthereumTokenInfo *token) {
bignum256 val = {0};
uint8_t pad_val[32] = {0};
memzero(pad_val, sizeof(pad_val));
memcpy(pad_val + (32 - value_len), value, value_len);
bn_read_be(pad_val, &val);
parse_bignum256(value, value_len, &val);
char amount[64] = {0};
if (token == NULL) {
@ -418,27 +423,19 @@ static void layoutEthereumFee(const uint8_t *value, uint32_t value_len,
const uint8_t *gas_limit, uint32_t gas_limit_len,
bool is_token) {
bignum256 val = {0}, gas = {0};
uint8_t pad_val[32] = {0};
char tx_value[32] = {0};
char gas_value[32] = {0};
memzero(tx_value, sizeof(tx_value));
memzero(gas_value, sizeof(gas_value));
memzero(pad_val, sizeof(pad_val));
memcpy(pad_val + (32 - gas_price_len), gas_price, gas_price_len);
bn_read_be(pad_val, &val);
memzero(pad_val, sizeof(pad_val));
memcpy(pad_val + (32 - gas_limit_len), gas_limit, gas_limit_len);
bn_read_be(pad_val, &gas);
parse_bignum256(gas_price, gas_price_len, &val);
parse_bignum256(gas_limit, gas_limit_len, &gas);
bn_multiply(&val, &gas, &secp256k1.prime);
ethereumFormatAmount(&gas, NULL, gas_value, sizeof(gas_value));
memzero(pad_val, sizeof(pad_val));
memcpy(pad_val + (32 - value_len), value, value_len);
bn_read_be(pad_val, &val);
parse_bignum256(value, value_len, &val);
if (bn_is_zero(&val)) {
strcpy(tx_value, is_token ? _("token") : _("message"));
@ -457,18 +454,14 @@ static void layoutEthereumFeeEIP1559(const char *description,
const uint8_t *multiplier_bytes,
uint32_t multiplier_len) {
bignum256 amount_val = {0};
uint8_t padded[32] = {0};
char amount_str[32] = {0};
memcpy(padded + (32 - amount_len), amount_bytes, amount_len);
bn_read_be(padded, &amount_val);
parse_bignum256(amount_bytes, amount_len, &amount_val);
if (multiplier_len > 0) {
bignum256 multiplier_val = {0};
memzero(padded, sizeof(padded));
memcpy(padded + (32 - multiplier_len), multiplier_bytes, multiplier_len);
bn_read_be(padded, &multiplier_val);
parse_bignum256(multiplier_bytes, multiplier_len, &multiplier_val);
bn_multiply(&multiplier_val, &amount_val, &secp256k1.prime);
}