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Eip191 review (#314)

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* Avoid using a global for is_ascii

* Fix unused var, missing init, and use size_t for length

* Use snprintf where possible
This commit is contained in:
yhql
2022-06-10 09:45:12 +02:00
committed by GitHub
parent fb677fc187
commit 6768ccaf78
2 changed files with 23 additions and 26 deletions
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47
src_features/signMessage/cmd_signMessage.c
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@@ -25,7 +25,7 @@ static inline bool is_char_special(char c) {
* @param[in] the length of the input data
* @return wether the data is fully ASCII or not
*/
static bool is_data_ascii(const uint8_t *const data, uint8_t length) {
static bool is_data_ascii(const uint8_t *const data, size_t length) {
for (uint8_t idx = 0; idx < length; ++idx) {
if (!is_char_special(data[idx]) && ((data[idx] < 0x20) || (data[idx] > 0x7e))) {
return false;
@@ -47,6 +47,13 @@ static void init_value_str(bool is_ascii) {
}
}
/**
* @return Whether the currently stored data is initialized as ASCII or not
*/
static bool is_value_str_ascii() {
return (memcmp(strings.tmp.tmp, "0x", 2) != 0);
}
/**
* Update the global UI string variable by formatting & appending the new data to it
*
@@ -54,7 +61,7 @@ static void init_value_str(bool is_ascii) {
* @param[in] length the data length
* @param[in] is_ascii wether the data is ASCII or not
*/
static void feed_value_str(const uint8_t *const data, uint8_t length, bool is_ascii) {
static void feed_value_str(const uint8_t *const data, size_t length, bool is_ascii) {
uint16_t value_strlen = strlen(strings.tmp.tmp);
if ((value_strlen + 1) < sizeof(strings.tmp.tmp)) {
@@ -92,11 +99,14 @@ static void feed_value_str(const uint8_t *const data, uint8_t length, bool is_as
sizeof(marker));
}
} else {
snprintf(strings.tmp.tmp + value_strlen,
sizeof(strings.tmp.tmp) - value_strlen,
"%.*H",
length,
data);
// truncate to strings.tmp.tmp 's size
length = MIN(length, (sizeof(strings.tmp.tmp) - value_strlen)/2);
for (size_t i = 0; i < length; i++ ) {
snprintf(strings.tmp.tmp + value_strlen + 2*i,
sizeof(strings.tmp.tmp) - value_strlen - 2*i,
"%02X",
data[i]);
}
}
}
}
@@ -107,16 +117,11 @@ void handleSignPersonalMessage(uint8_t p1,
uint16_t dataLength,
unsigned int *flags,
unsigned int *tx) {
// Point to this unused global variable for persistency
bool *is_ascii = (bool *) &strings.tmp.tmp2[0];
UNUSED(tx);
uint8_t hashMessage[INT256_LENGTH];
if (p1 == P1_FIRST) {
char tmp[11];
uint32_t index;
uint32_t base = 10;
uint8_t pos = 0;
char tmp[11] = {0};
uint32_t i;
if (dataLength < 1) {
PRINTF("Invalid data\n");
@@ -159,19 +164,11 @@ void handleSignPersonalMessage(uint8_t p1,
sizeof(SIGN_MAGIC) - 1,
NULL,
0);
for (index = 1; (((index * base) <= tmpCtx.messageSigningContext.remainingLength) &&
(((index * base) / base) == index));
index *= base)
;
for (; index; index /= base) {
tmp[pos++] = '0' + ((tmpCtx.messageSigningContext.remainingLength / index) % base);
}
tmp[pos] = '\0';
cx_hash((cx_hash_t *) &global_sha3, 0, (uint8_t *) tmp, pos, NULL, 0);
snprintf(tmp, sizeof(tmp), "%u", tmpCtx.messageSigningContext.remainingLength);
cx_hash((cx_hash_t *) &global_sha3, 0, (uint8_t *) tmp, strlen(tmp), NULL, 0);
cx_sha256_init(&tmpContent.sha2);
*is_ascii = is_data_ascii(workBuffer, dataLength);
init_value_str(*is_ascii);
init_value_str(is_data_ascii(workBuffer, dataLength));
} else if (p1 != P1_MORE) {
THROW(0x6B00);
@@ -191,7 +188,7 @@ void handleSignPersonalMessage(uint8_t p1,
cx_hash((cx_hash_t *) &tmpContent.sha2, 0, workBuffer, dataLength, NULL, 0);
tmpCtx.messageSigningContext.remainingLength -= dataLength;
feed_value_str(workBuffer, dataLength, *is_ascii);
feed_value_str(workBuffer, dataLength, is_value_str_ascii());
if (tmpCtx.messageSigningContext.remainingLength == 0) {
cx_hash((cx_hash_t *) &global_sha3,