SHA256: allow build if board uses mbedtls

Author: pennam

src/tls/utility/SHA256.cpp

@@ -33,15 +33,28 @@ constexpr size_t SHA256::HASH_SIZE;
 
 void SHA256::begin()
 {
+#if defined(HAS_BEARSSL)
   br_sha256_init(&_ctx);
+#else
+  mbedtls_sha256_init(&_ctx);
+  mbedtls_sha256_starts(&_ctx, 0);
+#endif
 }
 
 void SHA256::update(uint8_t const * data, size_t const len)
 {
+#if defined(HAS_BEARSSL)
   br_sha256_update(&_ctx, data, len);
+#else
+  mbedtls_sha256_update(&_ctx, data, len);
+#endif
 }
 
 void SHA256::finalize(uint8_t * hash)
 {
+#if defined(HAS_BEARSSL)
   br_sha256_out(&_ctx, hash);
+#else
+  mbedtls_sha256_finish(&_ctx, hash);
+#endif
 }

src/tls/utility/SHA256.h

@@ -21,8 +21,19 @@
 /******************************************************************************
  * INCLUDE
  ******************************************************************************/
+#include <AIoTC_Config.h>
 
-#include "../bearssl/bearssl_hash.h"
+#if defined(BOARD_HAS_OFFLOADED_ECCX08) || defined(BOARD_HAS_ECCX08)
+  #define HAS_BEARSSL
+#else
+  #define HAS_MBEDTLS
+#endif
+
+#if defined(HAS_BEARSSL)
+  #include <bearssl/bearssl_hash.h>
+#else
+  #include <mbedtls/sha256.h>
+#endif
 
 /******************************************************************************
  * CLASS DECLARATION
@@ -41,7 +52,11 @@ class SHA256
 
 private:
 
+#if defined(HAS_BEARSSL)
   br_sha256_context _ctx;
+#else
+  mbedtls_sha256_context _ctx;
+#endif
 
 };