Step by Step solution about How to resolve the algorithm SHA-1 step by step in the Kotlin programming language

This Kotlin code demonstrates how to calculate and print the SHA-1 hash of a given input string. Here's a detailed breakdown of the code:

1. Import necessary libraries: The code imports the necessary java.security.MessageDigest library for performing hash calculations.

2. Input String: It initializes a string variable text with the value "Rosetta Code". This string will be used to calculate the hash.

3. Convert String to Bytes: The code converts the input string text into a byte array using the toByteArray() method. This is because hash algorithms typically operate on binary data, so converting the string to bytes is necessary.

4. Create MessageDigest Instance: It creates a MessageDigest instance for the SHA-1 algorithm. SHA-1 is a cryptographic hash function widely used for generating a unique and irreversible digest of data.

5. Calculate Hash: The code then calculates the hash of the input bytes using the digest() method provided by MessageDigest. The result of this operation is stored in the digest variable.

6. Print the Hash: Finally, the code iterates through the bytes of the digest and prints them as hexadecimal strings using a format string "%02x". This ensures that each byte is represented as two hexadecimal digits, with leading zeros if necessary.

When you run this code, it will print the SHA-1 hash of the input string "Rosetta Code". The output will be a 40-character hexadecimal string, which represents the unique digest of the input data.

// version 1.0.6

import java.security.MessageDigest

fun main(args: Array<String>) {
    val text  = "Rosetta Code"
    val bytes = text.toByteArray()
    val md = MessageDigest.getInstance("SHA-1")
    val digest = md.digest(bytes)
    for (byte in digest) print("%02x".format(byte))
    println() 
}