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.


        ASN1EncodableVector  v = new ASN1EncodableVector();


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


        return new X509CertificateObject(new X509CertificateStructure(new DERSequence(v)));
    }
}

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        sig.update(rawMyPubkey);
          
        sig.update(rawEphemeralPubkey);
          
        final byte[] rawSign = sig.sign();
        
        final byte[] pad = new byte[random.nextInt(32)];
        
        random.nextBytes(pad);

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        sig.update(IV);
        
        sig.update(sharedSecret);
        
        final byte[] rawSig = sig.sign();


        putBytes( buffer, IV, 65535 );


        putBytes( buffer, rawSig, 65535 );
      }

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    Signature sig = CryptoECCUtils.getSignature( priv );
    
    try{
      sig.update( data );
      
      return( sig.sign());
      
    }catch( Throwable e ){
      
      throw( new CryptoManagerException( "Signature failed", e ));
    }

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    // control over auto-update process and prevent people from injecting
    // potentially huge bogus updates
  
    signature.update( encode( hash, version, size ));


    return( signature.sign());
  }
  
  protected static boolean
  verify(
    byte[]    public_key,

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                  error.printStackTrace();
                }
              },
              req,
              sig.sign());
            
          }else{
            
            usage();
          }

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    try{
      Signature sig = CryptoECCUtils.getSignature( CryptoECCUtils.rawdataToPrivkey( private_key ));


      sig.update( ( name + pk_str + sid_str + version + content ).getBytes( "UTF-8" ));
      
      byte[]  sig_bytes = sig.sign();
      
      /*
      Signature verify = CryptoECCUtils.getSignature( CryptoECCUtils.rawdataToPubkey( public_key ));


      verify.update( ( name + pk_str + sid_str + version + content ).getBytes( "UTF-8" ));

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        catch (Exception e)
        {
            throw new SecurityException("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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        ASN1EncodableVector  v = new ASN1EncodableVector();


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


        return new X509CertificateObject(new X509CertificateStructure(new DERSequence(v)));
    }
}

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


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


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

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