xxhash: Add custom secret tests.

tests/core/hash/test_core_hash.odin

@@ -167,7 +167,7 @@ test_xxhash_vectors :: proc(t: ^testing.T) {
 	defer delete(buf)
 
 	for seed, table in XXHASH_TEST_VECTOR_SEEDED {
-        fmt.printf("Seed: %v\n", seed)
+		fmt.printf("\tSeed: %v\n", seed)
 
 		for v, i in table {
 			b := buf[:i]
@@ -185,4 +185,20 @@ test_xxhash_vectors :: proc(t: ^testing.T) {
 			expect(t, xxh3_128  == v.xxh3_128, xxh3_128_error)
 		}
 	}
+
+	fmt.println("Verifying against XXHASH_TEST_VECTOR_SEEDED:")
+	for secret, table in XXHASH_TEST_VECTOR_SECRET {
+		fmt.printf("\tSecret:\n\t\t\"%v\"\n", secret)
+
+		secret_bytes := transmute([]u8)secret
+
+		for v, i in table {
+			b := buf[:i]
+
+			xxh3_128 := xxhash.XXH3_128(b, secret_bytes)
+			xxh3_128_error := fmt.tprintf("[XXH3_128(%03d)] Expected: %32x. Got: %32x.", i, v.xxh3_128_secret, xxh3_128)
+
+			expect(t, xxh3_128  == v.xxh3_128_secret, xxh3_128_error)
+		}
+	}
 }