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

32 lines (27 loc) · 747 Bytes

import java.io.*;

import java.security.*;

public class ReturnDigest extends Thread {

private String filename;

private byte[] digest;

public ReturnDigest(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();

digest = sha.digest();

} catch (IOException ex) {

System.err.println(ex);

} catch (NoSuchAlgorithmException ex) {

System.err.println(ex);

}

public byte[] getDigest() {

return digest;

}

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