The keys() method of java.security.Provider class is used to return an enumeration of the keys in this hashtable.
Syntax:
public Enumeration keys()
Return Value: This method returns an enumeration of the keys in this hashtable.
Below are the examples to illustrate the keys() method:
Program 1:
Java
// Java program to demonstrate // keys() method import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
// Declaring int variable
int i = 10 ;
try {
// creating the object of SecureRandom
SecureRandom sr = SecureRandom.getInstance( "NativePRNGBlocking" );
// getting the Provider of the SecureRandom sr
// by using method getProvider()
Provider provider = sr.getProvider();
// Declaring the variable of Enumeration<Object> type
Enumeration<Object> enume;
// getting the enumeration of the keys
enume = provider.keys();
// printing the enumerated keys
System.out.println( "enumeration of the values: \n" );
while (i > 0 ) {
System.out.println( "Value is: " + enume.nextElement());
i--;
}
}
catch (NoSuchAlgorithmException e) {
System.out.println( "Exception thrown : " + e);
}
}
} |
Output:
enumeration of the values: Value is: Alg.Alias.Signature.SHA1/DSA Value is: Alg.Alias.Signature.1.2.840.10040.4.3 Value is: Alg.Alias.Signature.DSS Value is: SecureRandom.SHA1PRNG ImplementedIn Value is: KeyStore.JKS Value is: Alg.Alias.MessageDigest.SHA-1 Value is: MessageDigest.SHA Value is: KeyStore.CaseExactJKS Value is: CertStore.com.sun.security.IndexedCollection ImplementedIn Value is: Signature.SHA256withDSA
Example 2:
Java
// Java program to demonstrate // keys() method import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
// Declaring int variable
int i = 10 ;
try {
// creating the object of Signature
Signature sr = Signature.getInstance( "SHA1withDSA" );
// getting the Provider of the Signature sr
// by using method getProvider()
Provider provider = sr.getProvider();
// Declaring the variable of Enumeration<Object> type
Enumeration<Object> enume;
// getting the enumeration of the keys
enume = provider.keys();
// printing the enumerated keys
System.out.println( "enumeration of the values: \n" );
while (i > 0 ) {
System.out.println( "Value is: " + enume.nextElement());
i--;
}
}
catch (NoSuchAlgorithmException e) {
System.out.println( "Exception thrown : " + e);
}
}
} |
Output:
enumeration of the values: Value is: Alg.Alias.Signature.SHA1/DSA Value is: Alg.Alias.Signature.1.2.840.10040.4.3 Value is: Alg.Alias.Signature.DSS Value is: SecureRandom.SHA1PRNG ImplementedIn Value is: KeyStore.JKS Value is: Alg.Alias.MessageDigest.SHA-1 Value is: MessageDigest.SHA Value is: KeyStore.CaseExactJKS Value is: CertStore.com.sun.security.IndexedCollection ImplementedIn Value is: Signature.SHA256withDSA