In order to be able to create a digital signature, you need a private key. (Its corresponding public key will be needed in order to verify the authenticity of the signature.)
Asymmetric cryptography also known as public-key encryption uses a public/private key pair to encrypt and decrypt data. Public key in asymmetric cryptography is available to public but the private key must be protected with the user, else it can be used to decrypt data. In.NET, the RSACryptoServiceProvider and DSACryptoServiceProvider classes are used for asymmetric encryption. A random public/private key pair is generated. Aug 17, 2017 use this online tool igolder to generate key pair keep the private key with you and share the public key with third party, but do remember the password which you provide in that website while generating that key pair you need that one in module configuration check this blog for more details on PGP decryption.
In some cases the key pair (private key and corresponding public key) are already available in files. In that case the program can import and use the private key for signing, as shown in Weaknesses and Alternatives.
In other cases the program needs to generate the key pair. A key pair is generated by using the
KeyPairGenerator class.
In this example you will generate a public/private key pair for the Digital Signature Algorithm (DSA). You will generate keys with a 1024-bit length.
Generating a key pair requires several steps:
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Create a Key Pair Generator
The first step is to get a key-pair generator object for generating keys for the DSA signature algorithm.
As with all engine classes, the way to get a
KeyPairGenerator object for a particular type of algorithm is to call the getInstance static factory method on the KeyPairGenerator class. This method has two forms, both of which hava a String algorithm first argument; one form also has a String provider second argument.
A caller may thus optionally specify the name of a provider, which will guarantee that the implementation of the algorithm requested is from the named provider. The sample code of this lesson always specifies the default SUN provider built into the JDK.
Put the following statement after the
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line in the file created in the previous step, Prepare Initial Program Structure:
Initialize the Key Pair Generator
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The next step is to initialize the key pair generator. All key pair generators share the concepts of a keysize and a source of randomness. The
KeyPairGenerator class has an initialize method that takes these two types of arguments.
The keysize for a DSA key generator is the key length (in bits), which you will set to 1024.
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The source of randomness must be an instance of the
SecureRandom class that provides a cryptographically strong random number generator (RNG). For more information about SecureRandom , see the SecureRandom API Specification and the Java Cryptography Architecture Reference Guide .
The following example requests an instance of
SecureRandom that uses the SHA1PRNG algorithm, as provided by the built-in SUN provider. The example then passes this SecureRandom instance to the key-pair generator initialization method.
Some situations require strong random values, such as when creating high-value and long-lived secrets like RSA public and private keys. To help guide applications in selecting a suitable strong
SecureRandom implementation, starting from JDK 8 Java distributions include a list of known strong SecureRandom implementations in the securerandom.strongAlgorithms property of the java.security.Security class. When you are creating such data, you should consider using SecureRandom.getInstanceStrong() , as it obtains an instance of the known strong algorithms.
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The final step is to generate the key pair and to store the keys in
PrivateKey and PublicKey objects.
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