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What is the Signature getInstance() method in Java?

Abhilash

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

Overview

Applications can access the capabilities of a digital signature algorithm using the Signature class. To authenticate and guarantee the integrity of digital data, digital signatures are utilized.

The getInstance() method is a static method of the Signature class that returns an instance of the Signature class that implements the specified signature algorithm. The signature algorithm can be specified as a string or as an implementation of the Provider class. The method throws NoSuchAlgorithmException if the specified algorithm or provider is not available.

Syntax

public static Signature getInstance(String algorithm)

Parameter

  • algorithm: This is the name of the signature algorithm.

Return value

The method returns a Signature object.

Code

import java.security.*;
public class Main{
public static void main(String[] args) {
try {
String algorithm = "SHA224withRSA";
Signature signature = Signature.getInstance(algorithm);
System.out.println("Signature object : " + signature.toString());
} catch (NoSuchAlgorithmException e) {
System.out.println("Exception : " + e);
}
}
}
getInstance() method

Explanation

  • Line 7: We define the signature algorithm.
  • Line 8: We obtain an instance of the Signature class using the getInstance() method by specifying the algorithm defined in Line 7.
  • Line 9: We print the signature object.
  • Lines 10–11: We catch the NoSuchAlgorithmException exception and print it.

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Abhilash
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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