diff options
| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Master/Reference Architectures and Patterns/hjp5/examples/Listing4803.java | |
| download | Studium-master.tar.gz Studium-master.tar.bz2 | |
Diffstat (limited to 'Master/Reference Architectures and Patterns/hjp5/examples/Listing4803.java')
| -rw-r--r-- | Master/Reference Architectures and Patterns/hjp5/examples/Listing4803.java | 49 |
1 files changed, 49 insertions, 0 deletions
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 |