Examples of java.security.Signature.sign()

java.security.Signature.sign()
Returns the signature bytes of all the data updated. The format of the signature depends on the underlying signature scheme.
A call to this method resets this signature object to the state it was in when previously initialized for signing via a call to initSign(PrivateKey). That is, the object is reset and available to generate another signature from the same signer, if desired, via new calls to update and sign. @return the signature bytes of the signing operation's result. @exception SignatureException if this signature object is notinitialized properly or if this signature algorithm is unable to process the input data provided.

      throws OAuthException {
    try {
      Signature signer = Signature.getInstance("SHA1withRSA");
      signer.initSign(privateKey);
      signer.update(baseString.getBytes("UTF-8"));
      return Base64.encode(signer.sign());
    } catch (NoSuchAlgorithmException e) {
      throw new OAuthException("Error generating signature", e);
    } catch (InvalidKeyException e) {
      throw new OAuthException("Error generating signature", e);
    } catch (SignatureException e) {

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                                            "generating RSA-SHA1 signatures.");
        }
        Signature signer = Signature.getInstance("SHA1withRSA");
        signer.initSign(privateKey);
        signer.update(message);
        return signer.sign();
    }


    private boolean verify(byte[] signature, byte[] message)
            throws GeneralSecurityException {
        if (publicKey == null) {

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  byte [] outBytes = DNSSEC.digestMessage(tmpsig, m, old);
  
  Signature signer = Signature.getInstance(algorithmName);
  signer.initSign(privateKey);
  signer.update(outBytes);
  byte [] signature = signer.sign();


  /*
   * RSA signatures are already in correct format, but Java DSA
   * routines use ASN.1; convert this to SIG format.
   */

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            sig.initSign(key);
        }


        sig.update(object.getEncoded(ASN1Encodable.DER));


        return sig.sign();
    }


    static byte[] calculateSignature(
        DERObjectIdentifier sigOid,
        String              sigName,

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            sig.initSign(key);
        }


        sig.update(object.getEncoded(ASN1Encodable.DER));


        return sig.sign();
    }


    static X509Principal convertPrincipal(
        X500Principal principal)
    {

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            ASN1EncodableVector  v = new ASN1EncodableVector();


            v.add(tbsCert);
            v.add(sigAlgId);
            v.add(new DERBitString(sig.sign()));


            return new X509CertificateObject(new X509CertificateStructure(new DERSequence(v)));
        }
        catch (Exception e)
        {

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            dOut.writeObject(tbsResp);


            sig.update(bOut.toByteArray());


            bitSig = new DERBitString(sig.sign());
        }
        catch (Exception e)
        {
            throw new OCSPException("exception processing TBSRequest: " + e, e);
        }

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            ASN1EncodableVector  v = new ASN1EncodableVector();


            v.add(tbsCert);
            v.add(sigAlgId);
            v.add(new DERBitString(sig.sign()));


            return new X509CertificateObject(new X509CertificateStructure(new DERSequence(v)));
        }
        catch (Exception e)
        {

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        // Construct the CRL
        ASN1EncodableVector  v = new ASN1EncodableVector();


        v.add(tbsCrl);
        v.add(sigAlgId);
        v.add(new DERBitString(sig.sign()));


        try
        {
            return new X509CRLObject(new CertificateList(new DERSequence(v)));
        }

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        catch (Exception e)
        {
            throw new IllegalArgumentException("exception encoding TBS cert request - " + e);
        }


        this.sigBits = new DERBitString(sig.sign());
    }


    /**
     * return the public key associated with the certification request -
     * the public key is created using the BC provider.

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