The update() method of the Signature class accepts a byte array representing the data to be signed or verified and updates the current object with the data given. Initialize the Signature object created in the previous step using the initSign() method as shown below. The initSign() method of the Signature class accepts a PrivateKey object and initializes the current Signature object.
Signature sign = Signature.getInstance("SHA256withDSA") The getInstance() method of the Signature class accepts a string parameter representing required signature algorithm and returns the respective Signature object.Ĭreate an object of the Signature class using the getInstance() method. Getting the private key from the key pair Get the private key using the getPrivate() method as shown below. You can get the private key from the generated KeyPair object using the getPrivate() method. Step 4: Get the private key from the pair KeyPair pair = keyPairGen.generateKeyPair() Generate the key pair using the generateKeyPair() method as shown below. You can generate the KeyPair using the generateKeyPair() method. Initialize the KeyPairGenerator object created in the previous step using the initialize() method as shown below. This method accepts an integer value representing the key size. The KeyPairGenerator class provides a method named initialize() this method is used to initialize the key pair generator. Step 2: Initialize the KeyPairGenerator object KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("DSA") The KeyPairGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyPairGenerator object that generates keys.Ĭreate KeyPairGenerator object using the getInstance() method as shown below. You can create digital signature using Java following the steps given below. Let us now learn how to create a digital signature.
Non-repudiationīy this property, any entity that has signed some information cannot at a later time deny having signed it. Once the message is signed, any change in the message would invalidate the signature. If the central office could not authenticate that message is sent from an authorized source, acting of such request could be a grave mistake. For example, if a bank’s branch office sends a message to central office, requesting for change in balance of an account. There are several reasons to implement digital signatures to communications − Authenticationĭigital signatures help to authenticate the sources of messages. In this section, we will learn about the different reasons that call for the use of digital signature. It also includes authentication function for additional capabilities. Digital signatures allow us to verify the author, date and time of signatures, authenticate the message contents.
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