Examples of java.security.Signature$Delegate

java.security.Signature
This Signature class is used to provide applications the functionality of a digital signature algorithm. Digital signatures are used for authentication and integrity assurance of digital data.
The signature algorithm can be, among others, the NIST standard DSA, using DSA and SHA-1. The DSA algorithm using the SHA-1 message digest algorithm can be specified as SHA1withDSA. In the case of RSA, there are multiple choices for the message digest algorithm, so the signing algorithm could be specified as, for example, MD2withRSA, MD5withRSA, or SHA1withRSA. The algorithm name must be specified, as there is no default.
A Signature object can be used to generate and verify digital signatures.
There are three phases to the use of a Signature object for either signing data or verifying a signature:
1. Initialization, with either
  - a public key, which initializes the signature for verification (see {@link #initVerify(PublicKey) initVerify}), or
  - a private key (and optionally a Secure Random Number Generator), which initializes the signature for signing (see {@link #initSign(PrivateKey)}and {@link #initSign(PrivateKey,SecureRandom)}).
2. Updating
  
  Depending on the type of initialization, this will update the bytes to be signed or verified. See the {@link #update(byte) update} methods.
3. Signing or Verifying a signature on all updated bytes. See the {@link #sign() sign} methods and the {@link #verify(byte[]) verify}method.
Note that this class is abstract and extends from SignatureSpi for historical reasons. Application developers should only take notice of the methods defined in this Signature class; all the methods in the superclass are intended for cryptographic service providers who wish to supply their own implementations of digital signature algorithms. @author Benjamin Renaud @version 1.103, 04/21/06

        PrivateKey          key,
        SecureRandom        random,
        ASN1Encodable       object)
        throws IOException, NoSuchAlgorithmException, InvalidKeyException, SignatureException
    {
        Signature sig;


        if (sigOid == null)
        {
            throw new IllegalStateException("no signature algorithm specified");
        }


        sig = X509Util.getSignatureInstance(sigName);


        if (random != null)
        {
            sig.initSign(key, random);
        }
        else
        {
            sig.initSign(key);
        }


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


        return sig.sign();
    }

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        PrivateKey          key,
        SecureRandom        random,
        ASN1Encodable       object)
        throws IOException, NoSuchProviderException, NoSuchAlgorithmException, InvalidKeyException, SignatureException
    {
        Signature sig;


        if (sigOid == null)
        {
            throw new IllegalStateException("no signature algorithm specified");
        }


        sig = X509Util.getSignatureInstance(sigName, provider);


        if (random != null)
        {
            sig.initSign(key, random);
        }
        else
        {
            sig.initSign(key);
        }


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


        return sig.sign();
    }

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    public final void verify(
        PublicKey   key)
        throws CertificateException, NoSuchAlgorithmException,
        InvalidKeyException, NoSuchProviderException, SignatureException
    {
        Signature   signature = null;


        if (!c.getSignatureAlgorithm().equals(c.getTBSCertificate().getSignature()))
        {
            throw new CertificateException("signature algorithm in TBS cert not same as outer cert");
        }


        try
        {
            signature = Signature.getInstance(c.getSignatureAlgorithm().getObjectId().getId(), "BC");
        }
        catch (Exception e)
        {
            signature = Signature.getInstance(c.getSignatureAlgorithm().getObjectId().getId());
        }


        signature.initVerify(key);


        signature.update(this.getTBSCertificate());


        if (!signature.verify(this.getSignature()))
        {
            throw new InvalidKeyException("Public key presented not for certificate signature");
        }
    }

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        PublicKey   key,
        String      sigProvider)
        throws CertificateException, NoSuchAlgorithmException,
        InvalidKeyException, NoSuchProviderException, SignatureException
    {
        Signature signature = Signature.getInstance(c.getSignatureAlgorithm().getObjectId().getId(), sigProvider);


        signature.initVerify(key);


        signature.update(this.getTBSCertificate());


        if (!signature.verify(this.getSignature()))
        {
            throw new InvalidKeyException("Public key presented not for certificate signature");
        }
    }

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   */
  public SignedAspect(Aspect extension, KeyPair keys) {
    publicKey = keys.getPublic();


    try {
      Signature signingEngine = Signature.getInstance(getSigningAlgorithm());
      signedExtension = new SignedObject(new MarshalledObject(extension), keys.getPrivate(), signingEngine);
    } catch (Exception e) {
      throw new IllegalArgumentException("failed to sign extension ("+e+")");
    }
  }

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   * @throws NoSuchAlgorithmException
   * @throws SignatureException
   * @throws InvalidKeyException
   */
  public void verifyExtension() throws NoSuchAlgorithmException, SignatureException, InvalidKeyException {
    Signature verificationEngine = Signature.getInstance(getSigningAlgorithm());
    signedExtension.verify(publicKey, verificationEngine);
    verified = true;
  }

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                }


                signature = bar.readBinaryString();
            }


            Signature s = Signature.getInstance("SHA1withRSA");
            s.initVerify(pubKey);
            s.update(data);


            return s.verify(signature);
        } catch (NoSuchAlgorithmException nsae) {
            throw new InvalidSignatureException();
        } catch (IOException ioe) {
            throw new InvalidSignatureException();
        } catch (java.security.InvalidKeyException ike) {

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     *
     * @return
     */
    public byte[] generateSignature(byte[] data) {
        try {
            Signature sig = Signature.getInstance("SHA1withRSA");
            sig.initSign(prvKey);
            sig.update(data);


            ByteArrayWriter baw = new ByteArrayWriter();
            baw.writeString(getAlgorithmName());
            baw.writeBinaryString(sig.sign());


            return baw.toByteArray();
        } catch (Exception e) {
            return null;
        }

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                asn1s.length);
                         int soffset = (((signature[20] & 0x80) == 0x80) ? 1 : 0);
                         System.arraycopy(signature, 20, encoded,
                asn1r.length + roffset + 20 + asn1s.length + soffset, 20);
             */
            Signature sig = Signature.getInstance("SHA1withDSA");
            sig.initVerify(pubkey);
            sig.update(data);


            return sig.verify(encoded);
        } catch (NoSuchAlgorithmException nsae) {
            throw new InvalidSignatureException();
        } catch (java.security.InvalidKeyException ike) {
            throw new InvalidSignatureException();
        } catch (IOException ioe) {

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     * @throws InvalidSshKeySignatureException
     */
    public byte[] generateSignature(byte[] data)
        throws InvalidSignatureException {
        try {
            Signature sig = Signature.getInstance("SHA1withDSA");
            sig.initSign(prvkey);


            sig.update(data);


            byte[] signature = sig.sign();
            byte[] decoded = new byte[40];
            SimpleASNReader asn = new SimpleASNReader(signature);
            asn.getByte();
            asn.getLength();
            asn.getByte();

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