Java Tutorial/Security/Provider

extends java.security.Provider

   <source lang="java">

import java.security.AccessController; import java.security.PrivilegedAction; public final class ECCProvider extends java.security.Provider {

 private static final String INFO = "jexp"s provider";
 public ECCProvider() {
   super("jexp", 1.0, INFO);
   AccessController.doPrivileged(new PrivilegedAction() {
     public Object run() {
       put("KeyFactory.ECC", "com.jexpKeyFactory");
       put("KeyPairGenerator.ECC", "com.jexpKeyPairGenerator");
       return null;
     }
   });
 }

}</source>

extends Provider

   <source lang="java">

import java.security.Provider; public class YourOwnProvider extends Provider {

 public YourOwnProvider() {
   super("YourOwn", 1.0, "YourOwn Security Provider v1.0");
   put("KeyGenerator.XOR", "yourPackageName.XORKeyGenerator");
   put("KeyPairGenerator.YourOwn", "yourPackageName.YourOwnKeyPairGenerator");
   put("KeyFactory.YourOwn", "yourPackageName.YourOwnKeyFactory");
   put("MessageDigest.YourOwn", "yourPackageName.YourOwnMessageDigest");
   put("Signature.YourOwnwithSHA", "yourPackageName.YourOwnSignature");
   put("Cipher.XOR", "yourPackageName.XORCipher");
   put("KeyManagerFactory.YourOwn", "yourPackageName.SSLKeyManagerFactory");
   put("Alg.Alias.MessageDigest.SHA-1", "SHA");
 }
 public static final synchronized void verifyForJCE() {
   throw new SecurityException("Can"t verify for JCE");
 }

}</source>

Get a Provider

   <source lang="java">

import java.security.Key; import java.security.Provider; import java.security.SecureRandom; import java.security.Security; import javax.crypto.Cipher; public final class MainClass {

 String providerName = "Rot13Provider";
 String algorithmName = "ROT13";
 public static void main(String[] args) throws Exception {
   Provider p = Security.getProvider("Rot13Provider");
   System.out.println("Provider name: " + p.getName());
   System.out.println("Provider version: " + p.getVersion());
   System.out.println("Provider information: " + p.getInfo());
   Cipher cipher = Cipher.getInstance("ROT13", "Rot13Provider");
   System.out.println("Cipher: " + cipher.getAlgorithm());
   String testString = "This is a test!";
   cipher.init(Cipher.ENCRYPT_MODE, (Key) null, new SecureRandom());
   byte[] b1 = cipher.doFinal(testString.getBytes());
   cipher.init(Cipher.DECRYPT_MODE, (Key) null, new SecureRandom());
   byte[] b2 = cipher.doFinal(b1);
   System.out.println("Decrypted data as a String: " + new String(b2));
 }

}</source>

Get cryptographic security providers

   <source lang="java">

import java.security.Provider; import java.security.Security; import java.util.HashSet; import java.util.Set; public class Main {

 public static void main(String[] args) {
   Set<Object> result = new HashSet<Object>();
   Provider[] providers = Security.getProviders();
   for (Provider provider : providers) {
     Set<Object> keys = provider.keySet();
     for (Object key : keys) {
       String data = (String) key;
       data = data.split(" ")[0];
       if (data.startsWith("Alg.Alias")) {
         data = data.substring(10);
       }
       data = data.substring(0, data.indexOf("."));
       result.add(data);
     }
   }
   for (Object o : result) {
     System.out.println("Service Type = " + o);
   }
 }

}</source>

Get Provider Info

   <source lang="java">

import java.security.Provider; import java.security.Security; public class MainClass {

 public static void main(String[] args) {
   System.out.println("Providers installed on your system:");
   Provider[] providerList = Security.getProviders();
   for (int i = 0; i < providerList.length; i++) {
     System.out.println("[" + (i + 1) + "] - Provider name: " + providerList[i].getName());
     System.out.println("Provider version number: " + providerList[i].getVersion());
     System.out.println("Provider information:\n" + providerList[i].getInfo());
   }
 }

} /*Providers installed on your system: [1] - Provider name: SUN Provider version number: 1.6 Provider information: SUN (DSA key/parameter generation; DSA signing; SHA-1, MD5 digests; SecureRandom; X.509 certificates; JKS keystore; PKIX CertPathValidator; PKIX CertPathBuilder; LDAP, Collection CertStores, JavaPolicy Policy; JavaLoginConfig Configuration) [2] - Provider name: SunRsaSign Provider version number: 1.5 Provider information: Sun RSA signature provider [3] - Provider name: SunJSSE Provider version number: 1.6 Provider information: Sun JSSE provider(PKCS12, SunX509 key/trust factories, SSLv3, TLSv1) [4] - Provider name: SunJCE Provider version number: 1.6 Provider information: SunJCE Provider (implements RSA, DES, Triple DES, AES, Blowfish, ARCFOUR, RC2, PBE, Diffie-Hellman, HMAC) [5] - Provider name: SunJGSS Provider version number: 1.0 Provider information: Sun (Kerberos v5, SPNEGO) [6] - Provider name: SunSASL Provider version number: 1.5 Provider information: Sun SASL provider(implements client mechanisms for: DIGEST-MD5, GSSAPI, EXTERNAL, PLAIN, CRAM-MD5; server mechanisms for: DIGEST-MD5, GSSAPI, CRAM-MD5) [7] - Provider name: XMLDSig Provider version number: 1.0 Provider information: XMLDSig (DOM XMLSignatureFactory; DOM KeyInfoFactory) [8] - Provider name: SunPCSC Provider version number: 1.6 Provider information: Sun PC/SC provider [9] - Provider name: SunMSCAPI Provider version number: 1.6 Provider information: Sun"s Microsoft Crypto API provider

• /</source>

Listing All Available Cryptographic Services

   <source lang="java">

import java.security.Provider; import java.security.Security; import java.util.HashSet; import java.util.Iterator; import java.util.Set; public class Main {

 public static void main(String[] argv) throws Exception {
   Set result = new HashSet();
   Provider[] providers = Security.getProviders();
   for (int i = 0; i < providers.length; i++) {
     Set keys = providers[i].keySet();
     for (Iterator it = keys.iterator(); it.hasNext();) {
       String key = (String) it.next();
       key = key.split(" ")[0];
       if (key.startsWith("Alg.Alias.")) {
         // Strip the alias
         key = key.substring(10);
       }
       int ix = key.indexOf(".");
       result.add(key.substring(0, ix));
     }
   }
   System.out.println(result);
 }

} [KeyFactory, TransformService, CertPathBuilder, Cipher, SecureRandom, Signature, AlgorithmParameterGenerator, KeyPairGenerator, XMLSignatureFactory, CertificateFactory, MessageDigest, KeyInfoFactory, KeyAgreement, CertStore, Configuration, SSLContext, SaslServerFactory, AlgorithmParameters, TrustManagerFactory, GssApiMechanism, TerminalFactory, Mac, KeyGenerator, Policy, CertPathValidator, SaslClientFactory, SecretKeyFactory, KeyManagerFactory, KeyStore, Provider]</source>

List the available capabilities for ciphers, key agreement, macs, message digests, signatures and other objects in the BC provider.

   <source lang="java">

import java.security.Provider; import java.security.Security; import java.util.Iterator; public class MainClass {

 public static void main(String[] args) {
   Provider provider = Security.getProvider("BC");
   Iterator it = provider.keySet().iterator();
   while (it.hasNext()) {
     String entry = (String) it.next();
     if (entry.startsWith("Alg.Alias.")) {
       entry = entry.substring("Alg.Alias.".length());
     }
     System.out.println(entry);
   }
 }

}</source>

Return the available implementations for a service type

   <source lang="java">

import java.security.Provider; import java.security.Security; import java.util.HashSet; import java.util.Iterator; import java.util.Set; public class Main {

 public static void main(String[] argv) throws Exception {
   Set result = new HashSet();
   String serviceType = "KeyFactory";
   Provider[] providers = Security.getProviders();
   for (int i = 0; i < providers.length; i++) {
     Set keys = providers[i].keySet();
     for (Iterator it = keys.iterator(); it.hasNext();) {
       String key = (String) it.next();
       key = key.split(" ")[0];
       if (key.startsWith(serviceType + ".")) {
         result.add(key.substring(serviceType.length() + 1));
       } else if (key.startsWith("Alg.Alias." + serviceType + ".")) {
         result.add(key.substring(serviceType.length() + 11));
       }
     }
   }
   System.out.println(result);
 }

} [1.2.840.113549.1.3.1, OID.1.2.840.113549.1.1, 1.2.840.113549.1.1, OID.1.2.840.113549.1.3.1, 1.3.14.3.2.12, DSA, DiffieHellman, RSA, DH, 1.2.840.10040.4.1]</source>

Security.getProviders()

   <source lang="java">

import java.security.Provider; import java.security.Security; import java.util.Enumeration; public class MainClass {

 public static void main(String args[]) throws Exception{
     Provider p[] = Security.getProviders();
     for (int i = 0; i < p.length; i++) {
       System.out.println(p[i]);
       for (Enumeration e = p[i].keys(); e.hasMoreElements();)
         System.out.println("\t" + e.nextElement());
     }
 }

}</source>