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.)
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
- Steps to generate self-signed PKCS#12 SSL certificate and export its keys: myKeystore.p12 = keystore filename. It can with.pfx extension as well. MYPASSWORD = password used for the keystore and the private key as well. CN = commonName, it will be shown as certiciate name in certificates list.
- The most popular Public Key Algorithms are RSA, Diffie-Hellman, ElGamal, DSS. Generate a Public-Private Key Pair. There are several ways to generate a Public-Private Key Pair depending on your platform. In this example, we will create a pair using Java. The Cryptographic Algorithm we will use in this example is RSA.
Generate Private Key And Public Key Java
JAVA generate RSA Public and Private Key Pairs using bouncy castle Crypto APIs. The following sample code generates RSA public and private keys and save them in separate files. You can pass the file names as input parameters and the program generates keys with 1024-bit size.
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:
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
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.
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.
Generate the Pair of Keys
The final step is to generate the key pair and to store the keys in