Added SHA-1 class to Fun's standard libs. (0.16.1)

examples/sha1_demo.fun

@@ -0,0 +1,48 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-10-01
+ */
+
+/*
+ * SHA-1 usage demo
+ *
+ * Run without installing:
+ *   FUN_LIB_DIR="$(pwd)/lib" ./build/fun examples/sha1_demo.fun
+ */
+
+#include <crypt/sha1.fun> as sha1
+
+print("=== SHA-1 demo ===")
+
+s = "abc"
+hex_abc = "616263"   // "abc" in hex
+empty = ""
+
+// Hash ASCII string directly
+d1 = sha1.SHA1().sha1_str(s)
+print("SHA-1('abc')        = " + d1)
+
+// Hash pre-encoded hex bytes
+d2 = sha1.SHA1().sha1_hex(hex_abc)
+print("SHA-1(616263 hex)   = " + d2)
+
+// Empty string
+d3 = sha1.SHA1().sha1_str(empty)
+print("SHA-1('')           = " + d3)
+
+print("=== done ===")
+
+/* Expected output:
+=== SHA-1 demo ===
+SHA-1('abc')        = e6cd2bcee460c45d41565ac877d866a159a16e19
+SHA-1(616263 hex)   = e6cd2bcee460c45d41565ac877d866a159a16e19
+SHA-1('')           = da39a3ee5e6b4b0d3255bfef95601890afd80709
+=== done ===