Unable to sign dig digg using java / keytool

Question

I created the certificate mainly right on the keytool example page:

keytool -genkey -dname "cn = Anything, ou = Anything, o = Anything, c = US" -alias business -keypass kpi135 -keystore C: \ mykeystore -storepass ab987c -validity 1095

I am trying to access this certificate and use a part of the private key to digitally sign part of the text for third-party authentication. Below is the code I'm trying to do:

   //Add bouncyCastle as a provider
   Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

   KeyStore keystore = KeyStore.getInstance("JKS");
   keystore.load(new FileInputStream("C:\\mykeystore"), "ab987c".toCharArray());
   Signature sig = Signature.getInstance("MD5withRSA", "BC");
   PrivateKey privateKey = (PrivateKey)keystore.getKey("business", "kpi135".toCharArray()); //Exception here
   sig.initSign(privateKey);
   sig.update("myUID__myNonce".getBytes());
   byte[] digitalSignature = sig.sign();

   System.out.println("Signature Formulated: " + digitalSignature);

I get the following exception:

java.security.InvalidKeyException: Supplied key (sun.security.provider.DSAPrivat
eKey) is not a RSAPrivateKey instance
        at org.bouncycastle.jce.provider.JDKDigestSignature.engineInitSign(Unkno
wn Source)
        at java.security.Signature$Delegate.engineInitSign(Signature.java:1095)
        at java.security.Signature.initSign(Signature.java:480)
        at MainClass.<init>(MainClass.java:15)
        at MainClass.main(MainClass.java:28)

, - , , , , keytool. , , -, -keysig RSA -sigalg RSA, , , :

keytool error: java.security.NoSuchAlgorithmException: RSA Signature not availab
le

enter code here

Answer 1

, "-keyalg RSA" keygen, . -keyalg -sigalg keygen. .