Refactored some type EIP712 formatting and hashing code to re-use it

src_features/signMessageEIP712/hash_bytes.c

@@ -0,0 +1,33 @@
+#ifdef HAVE_EIP712_FULL_SUPPORT
+
+#include "hash_bytes.h"
+
+/**
+ * Continue given progressive hash on given bytes
+ *
+ * @param[in] bytes_ptr pointer to bytes
+ * @param[in] n number of bytes to hash
+ * @param[in] hash_ctx pointer to the hashing context
+ */
+void hash_nbytes(const uint8_t *const bytes_ptr, uint8_t n, cx_hash_t *hash_ctx)
+{
+    cx_hash(hash_ctx,
+            0,
+            bytes_ptr,
+            n,
+            NULL,
+            0);
+}
+
+/**
+ * Continue given progressive hash on given byte
+ *
+ * @param[in] byte byte to hash
+ * @param[in] hash_ctx pointer to the hashing context
+ */
+void hash_byte(uint8_t byte, cx_hash_t *hash_ctx)
+{
+    hash_nbytes(&byte, 1, hash_ctx);
+}
+
+#endif // HAVE_EIP712_FULL_SUPPORT