java - Exception while trying to verify a digital signature -


i run java program verify digital signature

package com.cryptography;  import java.io.bufferedinputstream; import java.io.fileinputstream; import java.io.filenotfoundexception; import java.io.ioexception; import java.security.invalidkeyexception; import java.security.keyfactory; import java.security.nosuchalgorithmexception; import java.security.publickey; import java.security.signature; import java.security.signatureexception; import java.security.spec.invalidkeyspecexception; import java.security.spec.x509encodedkeyspec;  public class verifydkimsignature {     public static void main(string[] args) {         fileinputstream fis;         try {             //read encoded public key bytes             fis = new fileinputstream                     ("/home/src/com/cryptography/dkimpublickey");             byte[] enckey = new byte[fis.available()];             fis.read(enckey);             fis.close();              //generate public key             x509encodedkeyspec pubkeyspec = new x509encodedkeyspec(enckey);             keyfactory keyfactory = keyfactory.getinstance("rsa");             publickey pubkey = keyfactory.generatepublic(pubkeyspec);              //read signature bytes file             bufferedinputstream bis = new bufferedinputstream                     (new fileinputstream                             ("/home/src/com/cryptography/signature"));             byte[] signaturebytes = new byte[bis.available()];             bis.read(signaturebytes);            //initialise signature instance             signature sig = signature.getinstance("sha256withrsa");             sig.initverify(pubkey);             //supply signature object data verification             bis = new bufferedinputstream                     (new fileinputstream                           ("/home/src/com/cryptography/samplefile.txt"));             byte[] origfile = new byte[1024];             int len = 0;             while(bis.available() != 0) {                 len = bis.read(origfile);                 sig.update(origfile, 0, len);             }              boolean isverifies = sig.verify(signaturebytes);             system.out.println("signature verifies::"+isverifies);         } catch (filenotfoundexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (ioexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (nosuchalgorithmexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (invalidkeyspecexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (invalidkeyexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (signatureexception e) {             // todo auto-generated catch block             e.printstacktrace();         }      } }

when execute it, following exception

java.security.signatureexception: signature encoding error     @ sun.security.rsa.rsasignature.engineverify(unknown source)     @ java.security.signature$delegate.engineverify(unknown source)     @ java.security.signature.verify(unknown source)     @ com.cryptography.verifydkimsignature.main(verifydkimsignature.java:54) caused by: java.io.ioexception: objectidentifier mismatch: 1.3.14.3.2.26     @ sun.security.rsa.rsasignature.decodesignature(unknown source)     ... 4 more

can please explain reason error?

it turns out "1.3.14.3.2.26" (from ioexception) oid sha-1 algorithm. mistake have done here using different algorithms verification , signing i.e have used sha1withrsa signing , sha256with rsa verification. got resolved once changed algorithm @ verification end sha1withrsa


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