![]() ![]() Signature signature = Signature.getInstance("SHA1withDSA", "SUN") Get an instance of Signature object and initialize it. ![]() PrivateKey privateKey = keyPair.getPrivate() KeyPair keyPair = keyGen.generateKeyPair() Get a PrivateKey from the generated key pair. SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN") KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA", "SUN") Get instance and initialize a KeyPairGenerator object. To get the signature we call the sign() method which will return us a byte array of the signature.Īnd here is the complete code snippet: package To do this we read the file into byte using the helps of Files.readAllBytes() and supply the bytes into the Signature object using the update() method. ![]() To initialize call the Signature‘s initSign() method.Īnd finally to generate the digital signature we need to update the Signature using the data that we are going to sign. You can also see how to get a private key in the code snippet below. In this code snippet we’ll use SHA1withDSA and SUN for the algorithm and provider.īut before we can use the Signature object we have to initialize it first with a PrivateKey. To get one we can call the Signature.getInstance() method and pass the algorithm and the provider arguments. To create a digital signature we need an instance of. But for the signing process we’ll only use the private key, while the public key will be used to verify the signature. To create a signature we will need a key pair of public and private key. In the following code snippet you will learn how to generate a digital signature to sign a data or file. ![]()
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