diff --git a/esphome/components/md5/md5.cpp b/esphome/components/md5/md5.cpp
index 21bd2e1cab..ae4f0b108a 100644
--- a/esphome/components/md5/md5.cpp
+++ b/esphome/components/md5/md5.cpp
@@ -41,14 +41,6 @@ void MD5Digest::calculate() { br_md5_out(&this->ctx_, this->digest_); }
 
 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) {
   for (size_t i = 0; i < 16; i++) {
     if (expected[i] != this->digest_[i]) {
diff --git a/esphome/components/md5/md5.h b/esphome/components/md5/md5.h
index d777d7a143..6f1c92cf47 100644
--- a/esphome/components/md5/md5.h
+++ b/esphome/components/md5/md5.h
@@ -46,10 +46,6 @@ class MD5Digest : public HashBase {
   /// 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; }
 
@@ -61,7 +57,6 @@ class MD5Digest : public HashBase {
 
  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 a1f757cf0d..e59543cfba 100644
--- a/esphome/components/sha256/sha256.cpp
+++ b/esphome/components/sha256/sha256.cpp
@@ -19,7 +19,7 @@ void SHA256::init() {
 
 void SHA256::add(const uint8_t *data, size_t len) { mbedtls_sha256_update(&this->ctx_, data, len); }
 
-void SHA256::calculate() { mbedtls_sha256_finish(&this->ctx_, this->hash_); }
+void SHA256::calculate() { mbedtls_sha256_finish(&this->ctx_, this->digest_); }
 
 #elif defined(USE_ESP8266) || defined(USE_RP2040)
 
@@ -34,7 +34,7 @@ void SHA256::add(const uint8_t *data, size_t len) { br_sha256_update(&this->ctx_
 
 void SHA256::calculate() {
   if (!this->calculated_) {
-    br_sha256_out(&this->ctx_, this->hash_);
+    br_sha256_out(&this->ctx_, this->digest_);
     this->calculated_ = true;
   }
 }
@@ -69,7 +69,7 @@ void SHA256::calculate() {
   }
   if (!this->calculated_) {
     unsigned int len = 32;
-    EVP_DigestFinal_ex(this->ctx_, this->hash_, &len);
+    EVP_DigestFinal_ex(this->ctx_, this->digest_, &len);
     this->calculated_ = true;
   }
 }
@@ -78,15 +78,7 @@ void SHA256::calculate() {
 #error "SHA256 not supported on this platform"
 #endif
 
-void SHA256::get_bytes(uint8_t *output) { memcpy(output, this->hash_, 32); }
-
-void SHA256::get_hex(char *output) {
-  for (size_t i = 0; i < 32; i++) {
-    uint8_t byte = this->hash_[i];
-    output[i * 2] = format_hex_char(byte >> 4);
-    output[i * 2 + 1] = format_hex_char(byte & 0x0F);
-  }
-}
+void SHA256::get_bytes(uint8_t *output) { memcpy(output, this->digest_, 32); }
 
 std::string SHA256::get_hex_string() {
   char buf[65];
@@ -94,7 +86,7 @@ std::string SHA256::get_hex_string() {
   return std::string(buf);
 }
 
-bool SHA256::equals_bytes(const uint8_t *expected) { return memcmp(this->hash_, expected, 32) == 0; }
+bool SHA256::equals_bytes(const uint8_t *expected) { return memcmp(this->digest_, expected, 32) == 0; }
 
 bool SHA256::equals_hex(const char *expected) {
   uint8_t parsed[32];
diff --git a/esphome/components/sha256/sha256.h b/esphome/components/sha256/sha256.h
index 5af4c9a417..db12daac3f 100644
--- a/esphome/components/sha256/sha256.h
+++ b/esphome/components/sha256/sha256.h
@@ -34,7 +34,6 @@ 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)
@@ -46,14 +45,11 @@ class SHA256 : public esphome::HashBase {
  protected:
 #if defined(USE_ESP32) || defined(USE_LIBRETINY)
   mbedtls_sha256_context ctx_{};
-  uint8_t hash_[32];
 #elif defined(USE_ESP8266) || defined(USE_RP2040)
   br_sha256_context ctx_{};
-  uint8_t hash_[32];
   bool calculated_{false};
 #elif defined(USE_HOST)
   EVP_MD_CTX *ctx_{nullptr};
-  uint8_t hash_[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 ee646698d7..6a1e821169 100644
--- a/esphome/core/hash_base.h
+++ b/esphome/core/hash_base.h
@@ -2,6 +2,7 @@
 
 #include <cstdint>
 #include <cstddef>
+#include "esphome/core/helpers.h"
 
 namespace esphome {
 
@@ -21,10 +22,20 @@ class HashBase {
   virtual void calculate() = 0;
 
   /// Retrieve the hash as hex characters
-  virtual void get_hex(char *output) = 0;
+  virtual 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);
+    }
+  }
 
   /// 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 (MD5 uses 16 bytes, SHA256 uses 32)
 };
 
 }  // namespace esphome