KeyStore getKey() method in Java with Examples
Last Updated :
10 Dec, 2019
The getKey() method of java.security.KeyStore class is used to get the key associated with the given alias, using the given password to recover it.
Syntax:
public final Key getKey(String alias, char[] password)
throws KeyStoreException,
NoSuchAlgorithmException,
UnrecoverableKeyException
Parameter: This method accepts following parameters:
- alias: which is the alias name with whom the key is to be checked
- password: which is the password for recovering the key that is to be checked
Return Value: This method returns the key for the requested alias if it exists.
Exception: This method throws following exceptions
- KeyStoreException: if keystore is not loaded.
- NoSuchAlgorithmException: if the algorithm is missing
Note: All the programs in this article won’t run on online IDE as no ‘privatekey’ Keystore exists. You can check this code on Java compiler on your system. To check this code, create a Keystore ‘privatekey’ on your system and set your own Keystore password to access that Keystore.
Below are the examples to illustrate the getKey() method:
Example 1:
import java.security.*;
import java.security.cert.*;
import java.util.*;
import java.io.*;
public class GFG {
public static void main(String[] argv)
{
try {
KeyStore sr = KeyStore.getInstance( "JKS" );
char [] pass = ( "123456" ).toCharArray();
InputStream is
= new FileInputStream(
"f:/java/private key.store" );
sr.load(is, pass);
Key key = sr.getKey( "ftpkey" , pass);
System.out.println( "Key : "
+ key);
}
catch (NoSuchAlgorithmException e) {
System.out.println( "Exception thrown : " + e);
}
catch (NullPointerException e) {
System.out.println( "Exception thrown : " + e);
}
catch (KeyStoreException e) {
System.out.println( "Exception thrown : " + e);
}
catch (FileNotFoundException e) {
System.out.println( "Exception thrown : " + e);
}
catch (IOException e) {
System.out.println( "Exception thrown : " + e);
}
catch (CertificateException e) {
System.out.println( "Exception thrown : " + e);
}
catch (UnrecoverableKeyException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
Example 2: For KeyStoreException
import java.security.*;
import java.security.cert.*;
import java.util.*;
import java.io.*;
public class GFG {
public static void main(String[] argv)
{
try {
KeyStore sr = KeyStore.getInstance( "JKS" );
char [] pass = ( "123456" ).toCharArray();
InputStream is
= new FileInputStream(
"f:/java/private key.store" );
Key key = sr.getKey( "ftpkey" , pass);
System.out.println( "Key : "
+ key);
}
catch (FileNotFoundException e) {
System.out.println( "Exception thrown : " + e);
}
catch (NullPointerException e) {
System.out.println( "Exception thrown : " + e);
}
catch (KeyStoreException e) {
System.out.println( "\nException thrown : " + e);
}
catch (UnrecoverableKeyException e) {
System.out.println( "Exception thrown : " + e);
}
catch (NoSuchAlgorithmException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
Reference: https://docs.oracle.com/javase/9/docs/api/java/security/KeyStore.html#getKey-java.lang.String-char:A-
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