From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001
From: Sven Eisenhauer <sven@sven-eisenhauer.net>
Date: Fri, 10 Nov 2023 15:11:48 +0100
Subject: add new repo

---
 .../hjp5/examples/Listing4803.java                 | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Master/Reference Architectures and Patterns/hjp5/examples/Listing4803.java

(limited to 'Master/Reference Architectures and Patterns/hjp5/examples/Listing4803.java')

diff --git a/Master/Reference Architectures and Patterns/hjp5/examples/Listing4803.java b/Master/Reference Architectures and Patterns/hjp5/examples/Listing4803.java
new file mode 100644
index 0000000..dcc1e99
--- /dev/null
+++ b/Master/Reference Architectures and Patterns/hjp5/examples/Listing4803.java	
@@ -0,0 +1,49 @@
+/* Listing4803.java */
+
+import java.io.*;
+import java.security.*;
+
+public class Listing4803
+{
+  /**
+   * Konvertiert ein Byte in einen Hex-String.
+   */
+  public static String toHexString(byte b)
+  {
+    int value = (b & 0x7F) + (b < 0 ? 128 : 0);
+    String ret = (value < 16 ? "0" : "");
+    ret += Integer.toHexString(value).toUpperCase();
+    return ret;
+  }
+
+  public static void main(String[] args)
+  {
+    if (args.length < 2) {
+      System.out.println(
+        "Usage: java Listing4803 md-algorithm filename"
+      );
+      System.exit(0);
+    }
+    try {
+      //MessageDigest erstellen
+      MessageDigest md = MessageDigest.getInstance(args[0]);
+      FileInputStream in = new FileInputStream(args[1]);
+      int len;
+      byte[] data = new byte[1024];
+      while ((len = in.read(data)) > 0) {
+        //MessageDigest updaten
+        md.update(data, 0, len);
+      }
+      in.close();
+      //MessageDigest berechnen und ausgeben
+      byte[] result = md.digest();
+      for (int i = 0; i < result.length; ++i) {
+        System.out.print(toHexString(result[i]) + " ");
+      }
+      System.out.println();
+    } catch (Exception e) {
+      System.err.println(e.toString());
+      System.exit(1);
+    }
+  }
+}
\ No newline at end of file
-- 
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