From 8ea13115a0304f1b124bb526d0170982fc55e211 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sun, 21 Sep 2025 12:06:12 -0600
Subject: [PATCH] preen

---
 esphome/components/md5/md5.cpp       | 12 ------------
 esphome/components/md5/md5.h         | 12 ------------
 esphome/components/sha256/sha256.cpp | 12 ------------
 esphome/components/sha256/sha256.h   |  8 --------
 esphome/core/hash_base.h             | 23 +++++++++++++++++++++--
 5 files changed, 21 insertions(+), 46 deletions(-)

diff --git a/esphome/components/md5/md5.cpp b/esphome/components/md5/md5.cpp
index 202e25cadd..866f00eda4 100644
--- a/esphome/components/md5/md5.cpp
+++ b/esphome/components/md5/md5.cpp
@@ -39,18 +39,6 @@ void MD5Digest::add(const uint8_t *data, size_t len) { br_md5_update(&this->ctx_
 void MD5Digest::calculate() { br_md5_out(&this->ctx_, this->digest_); }
 #endif  // USE_RP2040
 
-void MD5Digest::get_bytes(uint8_t *output) { memcpy(output, this->digest_, 16); }
-
-void MD5Digest::get_hex(char *output) {
-  for (size_t i = 0; i < 16; i++) {
-    uint8_t byte = this->digest_[i];
-    output[i * 2] = format_hex_char(byte >> 4);
-    output[i * 2 + 1] = format_hex_char(byte & 0x0F);
-  }
-}
-
-bool MD5Digest::equals_bytes(const uint8_t *expected) { return memcmp(this->digest_, expected, 16) == 0; }
-
 }  // namespace md5
 }  // namespace esphome
 #endif
diff --git a/esphome/components/md5/md5.h b/esphome/components/md5/md5.h
index 4c741ea536..cb0acefd7d 100644
--- a/esphome/components/md5/md5.h
+++ b/esphome/components/md5/md5.h
@@ -42,23 +42,11 @@ class MD5Digest : public HashBase {
   /// Compute the digest, based on the provided data.
   void calculate() override;
 
-  /// Retrieve the MD5 digest as bytes.
-  /// The output must be able to hold 16 bytes or more.
-  void get_bytes(uint8_t *output);
-
-  /// Retrieve the MD5 digest as hex characters.
-  /// The output must be able to hold 32 bytes or more.
-  void get_hex(char *output) override;
-
   /// Get the size of the hex output (32 for MD5)
   size_t get_hex_size() const override { return 32; }
 
-  /// Compare the digest against a provided byte-encoded digest (16 bytes)
-  bool equals_bytes(const uint8_t *expected) override;
-
  protected:
   MD5_CTX_TYPE ctx_{};
-  uint8_t digest_[16];
 };
 
 }  // namespace md5
diff --git a/esphome/components/sha256/sha256.cpp b/esphome/components/sha256/sha256.cpp
index 8042700a10..24d15be4a7 100644
--- a/esphome/components/sha256/sha256.cpp
+++ b/esphome/components/sha256/sha256.cpp
@@ -78,18 +78,6 @@ void SHA256::calculate() {
 #error "SHA256 not supported on this platform"
 #endif
 
-void SHA256::get_bytes(uint8_t *output) { memcpy(output, this->digest_, 32); }
-
-void SHA256::get_hex(char *output) {
-  for (size_t i = 0; i < 32; i++) {
-    uint8_t byte = this->digest_[i];
-    output[i * 2] = format_hex_char(byte >> 4);
-    output[i * 2 + 1] = format_hex_char(byte & 0x0F);
-  }
-}
-
-bool SHA256::equals_bytes(const uint8_t *expected) { return memcmp(this->digest_, expected, 32) == 0; }
-
 std::string SHA256::get_hex_string() {
   char buf[65];
   this->get_hex(buf);
diff --git a/esphome/components/sha256/sha256.h b/esphome/components/sha256/sha256.h
index 9ba1b19802..f650008ac7 100644
--- a/esphome/components/sha256/sha256.h
+++ b/esphome/components/sha256/sha256.h
@@ -33,27 +33,19 @@ class SHA256 : public esphome::HashBase {
 
   void calculate() override;
 
-  void get_bytes(uint8_t *output);
-  void get_hex(char *output) override;
   std::string get_hex_string();
 
   /// Get the size of the hex output (64 for SHA256)
   size_t get_hex_size() const override { return 64; }
 
-  /// Compare the digest against a provided byte-encoded digest (32 bytes)
-  bool equals_bytes(const uint8_t *expected) override;
-
  protected:
 #if defined(USE_ESP32) || defined(USE_LIBRETINY)
   mbedtls_sha256_context ctx_{};
-  uint8_t digest_[32];
 #elif defined(USE_ESP8266) || defined(USE_RP2040)
   br_sha256_context ctx_{};
-  uint8_t digest_[32];
   bool calculated_{false};
 #elif defined(USE_HOST)
   EVP_MD_CTX *ctx_{nullptr};
-  uint8_t digest_[32];
   bool calculated_{false};
 #else
 #error "SHA256 not supported on this platform"
diff --git a/esphome/core/hash_base.h b/esphome/core/hash_base.h
index 48944b9e7a..e35aee0475 100644
--- a/esphome/core/hash_base.h
+++ b/esphome/core/hash_base.h
@@ -22,11 +22,27 @@ class HashBase {
   /// Compute the hash based on provided data
   virtual void calculate() = 0;
 
+  /// Retrieve the hash as bytes
+  void get_bytes(uint8_t *output) {
+    const size_t hash_bytes = this->get_hex_size() / 2;
+    memcpy(output, this->digest_, hash_bytes);
+  }
+
   /// Retrieve the hash as hex characters
-  virtual void get_hex(char *output) = 0;
+  void get_hex(char *output) {
+    const size_t hash_bytes = this->get_hex_size() / 2;
+    for (size_t i = 0; i < hash_bytes; i++) {
+      uint8_t byte = this->digest_[i];
+      output[i * 2] = format_hex_char(byte >> 4);
+      output[i * 2 + 1] = format_hex_char(byte & 0x0F);
+    }
+  }
 
   /// Compare the hash against a provided byte-encoded hash
-  virtual bool equals_bytes(const uint8_t *expected) = 0;
+  bool equals_bytes(const uint8_t *expected) {
+    const size_t hash_bytes = this->get_hex_size() / 2;
+    return memcmp(this->digest_, expected, hash_bytes) == 0;
+  }
 
   /// Compare the hash against a provided hex-encoded hash
   bool equals_hex(const char *expected) {
@@ -40,6 +56,9 @@ class HashBase {
 
   /// Get the size of the hex output (32 for MD5, 64 for SHA256)
   virtual size_t get_hex_size() const = 0;
+
+ protected:
+  uint8_t digest_[32];  // Common digest storage, sized for largest hash (SHA256)
 };
 
 }  // namespace esphome