Crypto Key Generate Command
Key generators are constructed using one of the
getInstance class methods of this class.
I was working on a Cisco 3750-G last week, and I was in the process of setting up SSH access. When I went to generate the crypto key and enable SSH, It fired an. PKI (Public Key Authentication) is an authentication method that uses a key pair for authentication instead of a password. Two keys are generated: Public key Private key Anyone (or any device) that has the public key is able to encrypt data that can only be decrypted by the private key. Rack19r1(config)#crypto key generate rsa general-keys label cisco. The name for the keys will be: cisco. Choose the size of the key modulus in the range of 360 to 2048 for your. General Purpose Keys. Choosing a key modulus greater than 512 may take. Oct 02, 2015 SSH Config and crypto key generate RSA command. Use this command to generate RSA key pairs for your Cisco device (such as a router). Keys are generated in pairs–one public RSA key and one private RSA key. If your router already has RSA keys when you issue this command, you will be warned and prompted to replace the existing keys with new keys.
KeyGenerator objects are reusable, i.e., after a key has been generated, the same KeyGenerator object can be re-used to generate further keys.
There are two ways to generate a key: in an algorithm-independent manner, and in an algorithm-specific manner. The only difference between the two is the initialization of the object:
- Algorithm-Independent Initialization
All key generators share the concepts of a keysize and a source of randomness. There is an
initmethod in this KeyGenerator class that takes these two universally shared types of arguments. There is also one that takes just a
keysizeargument, and uses the SecureRandom implementation of the highest-priority installed provider as the source of randomness (or a system-provided source of randomness if none of the installed providers supply a SecureRandom implementation), and one that takes just a source of randomness.
Since no other parameters are specified when you call the above algorithm-independent
initmethods, it is up to the provider what to do about the algorithm-specific parameters (if any) to be associated with each of the keys.
- Algorithm-Specific Initialization
For situations where a set of algorithm-specific parameters already exists, there are two
initmethods that have an
AlgorithmParameterSpecargument. One also has a
SecureRandomargument, while the other uses the SecureRandom implementation of the highest-priority installed provider as the source of randomness (or a system-provided source of randomness if none of the installed providers supply a SecureRandom implementation).
In case the client does not explicitly initialize the KeyGenerator (via a call to an
init method), each provider must supply (and document) a default initialization.
Every implementation of the Java platform is required to support the following standard
KeyGenerator algorithms with the keysizes in parentheses: