java_network_programming_4th/src/CallbackDigest.java at master · cristobalc/java_network_programming_4th

28 lines (24 loc) · 748 Bytes

import java.io.*;

import java.security.*;

public class CallbackDigest implements Runnable {

private String filename;

public CallbackDigest(String filename) {

this.filename = filename;

}

@Override

public void run() {

try {

FileInputStream in = new FileInputStream(filename);

MessageDigest sha = MessageDigest.getInstance("SHA-256");

DigestInputStream din = new DigestInputStream(in, sha);

while (din.read() != -1) ; // read entire file

din.close();

byte[] digest = sha.digest();

CallbackDigestUserInterface.receiveDigest(digest, filename);

} catch (IOException ex) {

System.err.println(ex);

} catch (NoSuchAlgorithmException ex) {

System.err.println(ex);

}

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