Sono ancora io,ho il mio solito problema sono riuscito a creare un file che generi un impronta hash esadecimale ora vorrei che l'impronta venisse memorizzata in un file di testo come posso fare? ecco il mio code
<code >
package miaclasse ;
import java.io.*;
import java.security.*;
public class MessageDigestEncoder {
public static String valore;
static private byte [] loadByteData (String filename) {
FileInputStream fis = null;
try {
fis = new FileInputStream (filename);
BufferedInputStream bis = new BufferedInputStream (fis);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int ch;
while ((ch = bis.read()) != -1) {
baos.write (ch);
}
return baos.toByteArray();
} catch (IOException e) {
if (fis != null) {
try {
fis.close();
} catch (IOException ee) {
// ignore
}
}
return null;
}
}
static private String hexDigit(byte x) {
StringBuffer sb = new StringBuffer();
char c;
// First nibble
c = (char) ((x >> 4) & 0xf);
if (c > 9) {
c = (char) ((c - 10) + 'a');
} else {
c = (char) (c + '0');
}
sb.append (c);
// Second nibble
c = (char) (x & 0xf);
if (c > 9) {
c = (char)((c - 10) + 'a');
} else {
c = (char)(c + '0');
}
sb.append (c);
return sb.toString();
}
static private String computeDigest (MessageDigest algorithm, String filename) {
byte[] content = loadByteData (filename);
if (content != null) {
algorithm.reset();
algorithm.update (content);
byte digest[] = algorithm.digest();
StringBuffer hexString = new StringBuffer();
int digestLength = digest.length;
for (int i=0;i<digestLength;i++) {
hexString.append (hexDigit(digest[i]));
hexString.append (" ");
}
return hexString.toString();
} else {
return "";
}
}
public static void privkey()
{
try {
MessageDigest algorithm = MessageDigest.getInstance("MD5");
String filename = "c:\\t.txt";
String digest = computeDigest (algorithm, filename);
valore = "nome file :__ " + filename + "________impronta hash :" + digest;
}
catch (Exception e) {
System.err.println (e.toString());
}
}
public String verificaValore()
{
return valore;
}
}
</code>
grazie in anticipo
Rispondi quotando
