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[hmac_sha256] Replace unsafe sprintf with format_hex_to (#13290)

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This commit is contained in:
J. Nick Koston
2026-01-16 22:16:38 -05:00
committed by GitHub
parent bbe1155518
commit e54d5ee898
1 changed files with 1 additions and 4 deletions
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esphome/components/hmac_sha256/hmac_sha256.cpp
+1 -4
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@@ -1,4 +1,3 @@
#include <cstdio>
#include <cstring>
#include "hmac_sha256.h"
#if defined(USE_ESP32) || defined(USE_ESP8266) || defined(USE_RP2040) || defined(USE_LIBRETINY) || defined(USE_HOST)
@@ -26,9 +25,7 @@ void HmacSHA256::calculate() { mbedtls_md_hmac_finish(&this->ctx_, this->digest_
void HmacSHA256::get_bytes(uint8_t *output) { memcpy(output, this->digest_, SHA256_DIGEST_SIZE); }
void HmacSHA256::get_hex(char *output) {
for (size_t i = 0; i < SHA256_DIGEST_SIZE; i++) {
sprintf(output + (i * 2), "%02x", this->digest_[i]);
}
format_hex_to(output, SHA256_DIGEST_SIZE * 2 + 1, this->digest_, SHA256_DIGEST_SIZE);
}
bool HmacSHA256::equals_bytes(const uint8_t *expected) {