Add byte-swapping utility function for endian conversion

- Implement swab32() function to perform 32-bit byte-order reversal
- Provides a static inline utility for converting between big and little-endian representations
- Supports potential cross-platform hashing requirements in VIPStar implementation

Author: emerauda

package-lock.json

@@ -16,12 +16,12 @@
     },
     "dependencies": {
         "bindings": "^1.5.0",
-        "nan": "^2.22.0"
+        "nan": "^2.22.2"
     },
     "devDependencies": {
-        "@babel/core": "7.26.0",
+        "@babel/core": "7.26.9",
         "@babel/register": "^7.25.9",
-        "mocha": "^11.0.1"
+        "mocha": "^11.1.0"
     },
     "keywords": [
         "argon2",

package.json

@@ -21,6 +21,14 @@ static inline void sha256_init_256(__m256i *state)
 }
 #endif /* __SSE2__ */
 
+static inline uint32_t swab32(uint32_t x)
+{
+	return ((x & 0x000000FF) << 24) |
+		   ((x & 0x0000FF00) << 8) |
+		   ((x & 0x00FF0000) >> 8) |
+		   ((x & 0xFF000000) >> 24);
+}
+
 static inline void sha256d_preextend(uint32_t *W)
 {
 	W[16] = s1(W[14]) + W[9] + s0(W[1]) + W[0];