On Fri, 16 Oct 2020 18:53:39 +0000, Sasso, Len <[email protected]> wrote:
>Anyone know if a Checksum/Md5 file can be created on a IBM Mainframe?
Yes.
>If so, how?
package com.jantje.checksum;
import com.ibm.jzos.FileFactory;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5CheckSum {
public static byte[] createChecksum(String filename) throws IOException,
NoSuchAlgorithmException {
InputStream inputStream = FileFactory.newInputStream(filename);
//InputStream inputStream = new FileInputStream(filename);
byte[] buffer = new byte[1024];
MessageDigest complete = MessageDigest.getInstance("MD5");
int numRead;
do {
numRead = inputStream.read(buffer);
if (numRead > 0) {
complete.update(buffer, 0, numRead);
}
} while (numRead != -1);
inputStream.close();
return complete.digest();
}
public static String getMD5Checksum(String filename) throws IOException,
NoSuchAlgorithmException {
byte[] b = createChecksum(filename);
String result = "";
for (int i = 0; i < b.length; i++) {
result +=
Integer.toString((b[i] & 0xff) + 0x100, 16).substring(1);
}
return result;
}
public static void getMD5CheckSums(String parmFileName) throws IOException,
NoSuchAlgorithmException {
BufferedReader fileNames = FileFactory.newBufferedReader(parmFileName);
try {
String datasetName;
while ((datasetName = fileNames.readLine()) != null) {
System.out.print(String.format("%1$-50s", datasetName));
System.out.println(getMD5Checksum(datasetName));
}
} finally {
fileNames.close();
}
}
public static void main(String args[]) {
try {
getMD5CheckSums(args[0]);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Cheers,
Jantje.
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