java - Verifying RSA SHA256 signature fails getting private key from certificate -

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i'm trying verify data string , rsa-sha256 signature received webservice , i'm stuck loading private/public key certificate.

i have following code retrieve info cer file, think in der format because it's not in typical base64 encoded:

inputstream in = new fileinputstream(path1); certificatefactory factory = certificatefactory.getinstance("x.509"); x509certificate cert = (x509certificate) factory.generatecertificate(in); system.out.println(cert.tostring());

it outputs whole info of certificate:

version: v3 subject: emailaddress=... ... algorithm: [sha256withrsa] ...

but if try load , retrieve private key following code:

keyfactory kf = keyfactory.getinstance("rsa");         x509encodedkeyspec bobpubkeyspec = new x509encodedkeyspec(encodedkey); keyfactory keyfactory = keyfactory.getinstance("rsa"); publickey bobpubkey = keyfactory.generatepublic(bobpubkeyspec); signature sig = signature.getinstance("sha256withrsa"); sig.initverify(bobpubkey); sig.update(data_received); sig.verify(signature_received);

i following exception

 java.security.spec.invalidkeyspecexception: java.security.invalidkeyexception: invalid key format

in keyfactory.generatepublic method. same result if change generateprivate.

thanks james, following advise made following:

        inputstream in = new fileinputstream(system.getproperty("user.dir") + "\\" + certificatename);         certificatefactory factory = certificatefactory.getinstance("x.509");         x509certificate cert = (x509certificate) factory.generatecertificate(in);         publickey pubkey = cert.getpublickey();           signature sig = signature.getinstance("sha256withrsa");         sig.initverify(pubkey);         sig.update(xmlcontent);          return sig.verify(headersignature);

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