change(MD5Builder): Const-correctness. (espressif#9104)

* change(HashBuilder): Const-correctness

Propagate 'const' of buffer variable from underlying functions.

* Remove char* methods

---------

Co-authored-by: Lucas Saavedra Vaz <32426024+lucasssvaz@users.noreply.github.com>

Author: StefanOberhumer

cores/esp32/HashBuilder.h

@@ -26,25 +26,17 @@ class HashBuilder : public HEXBuilder
     virtual ~HashBuilder() {}
     virtual void begin() = 0;
 
-    virtual void add(uint8_t* data, size_t len) = 0;
+    virtual void add(const uint8_t* data, size_t len) = 0;
     virtual void add(const char* data)
     {
-        add((uint8_t*)data, strlen(data));
-    }
-    virtual void add(char* data)
-    {
-        add((const char*)data);
+        add((const uint8_t*)data, strlen(data));
     }
     virtual void add(String data)
     {
         add(data.c_str());
     }
 
     virtual void addHexString(const char* data) = 0;
-    virtual void addHexString(char* data)
-    {
-        addHexString((const char*)data);
-    }
     virtual void addHexString(String data)
     {
         addHexString(data.c_str());

cores/esp32/MD5Builder.cpp

@@ -27,7 +27,7 @@ void MD5Builder::begin(void)
     esp_rom_md5_init(&_ctx);
 }
 
-void MD5Builder::add(uint8_t * data, size_t len)
+void MD5Builder::add(const uint8_t * data, size_t len)
 {
     esp_rom_md5_update(&_ctx, data, len);
 }

cores/esp32/MD5Builder.h

@@ -38,7 +38,7 @@ class MD5Builder : public HashBuilder
     void begin(void) override;
 
     using HashBuilder::add;
-    void add(uint8_t * data, size_t len) override;
+    void add(const uint8_t * data, size_t len) override;
 
     using HashBuilder::addHexString;
     void addHexString(const char * data) override;

cores/esp32/SHA1Builder.cpp

@@ -230,7 +230,7 @@ void SHA1Builder::begin(void)
     memset(hash, 0x00, sizeof(hash));
 }
 
-void SHA1Builder::add(uint8_t* data, size_t len)
+void SHA1Builder::add(const uint8_t* data, size_t len)
 {
     size_t fill;
     uint32_t left;

cores/esp32/SHA1Builder.h

@@ -36,7 +36,7 @@ class SHA1Builder : public HashBuilder
     void begin() override;
 
     using HashBuilder::add;
-    void add(uint8_t* data, size_t len) override;
+    void add(const uint8_t* data, size_t len) override;
 
     using HashBuilder::addHexString;
     void addHexString(const char* data) override;