Problem with Provider

Question

Hi iam a newbee to this Forum and have some problems with the JCA API.
I try to do somting linke this :
Signature sign = Signature.getInstance("SHA256WithRSA", "SUN");
the Compiler notfie some problem
Exception in thread "main" java.security.NoSuchAlgorithmException: no such algorithm: SHA256WithRSA for provider SUN
     at sun.security.jca.GetInstance.getService(Unknown Source)
     at sun.security.jca.GetInstance.getInstance(Unknown Source)
     at java.security.Signature.getInstance(Unknown Source)
     at pkcs_signer.coconet_package.TestClass.main(TestClass.java:76)
How i can solve this problem ? i use the SUN Provider.
I read in the internet i need to Download the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files 6, is this right ? and how i install this ?
thank you
Richard from Germany ( Java newbie )

Answer 1

878183 wrote:
Signature sign = Signature.getInstance("SHA256withRSA");
System.out.println(sign.getAlgorithm());
the Compiler searches vor a Provider is this right ? and then the compiler find the SUN Provider. Since the SUN provider does not provide an implementation for "SHA256withRSA" then no - the JRE (not compiler) does not find the SUN provider. BUT - the JRE does find the "SunRsaSign" provider which does support "SHA256withRSA". You can of course explicitly request the "SunRsaSign" provider using
      Signature sign = Signature.getInstance("SHA256withRSA","SunRsaSign");