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() methodimport 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() methodimport 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
