Doxygen code comment cleanups and new blog post. No code changes. (0.41.5)

src/vm/openssl/sha512.c

@@ -8,8 +8,24 @@
  */
 
 /**
- * OpenSSL SHA-512 builtin
+ * @file sha512.c
+ * @brief Implements OP_OPENSSL_SHA512 to compute a SHA-512 hash in hex.
+ *
+ * Behavior:
+ * - Pops one value from the VM stack and converts it to bytes by first
+ *   turning it into a string with value_to_string_alloc().
+ * - Computes the SHA-512 digest via fun_openssl_sha512_hex() and pushes the
+ *   lowercase hexadecimal string back on the stack.
+ * - On allocation or hashing failure, pushes an empty string ("").
+ *
+ * Notes:
+ * - Non-string inputs are accepted and stringified first.
+ * - This file is included by vm.c and handles OP_OPENSSL_SHA512.
+ *
+ * Errors:
+ * - Does not abort the VM; failures return an empty string.
  */
+
 case OP_OPENSSL_SHA512: {
   Value vdata = pop_value(vm);
   char *s = value_to_string_alloc(&vdata);