How to resolve the algorithm RIPEMD-160 step by step in the Kotlin programming language

Published on 22 June 2024 08:30 PM

How to resolve the algorithm RIPEMD-160 step by step in the Kotlin programming language

Table of Contents

Problem Statement

RIPEMD-160 is another hash function; it computes a 160-bit message digest. There is a RIPEMD-160 home page, with test vectors and pseudocode for RIPEMD-160. For padding the message, RIPEMD-160 acts like MD4 (RFC 1320). Find the RIPEMD-160 message digest of a string of octets. Use the ASCII encoded string “Rosetta Code”. You may either call an RIPEMD-160 library, or implement RIPEMD-160 in your language.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm RIPEMD-160 step by step in the Kotlin programming language

The provided Kotlin code snippet showcases how to calculate the RIPEMD-160 digest of a given input byte array in one go using the org.bouncycastle.crypto.digests.RIPEMD160Digest class.

Here's a breakdown of the code:

  1. Importing the necessary libraries: The code imports the RIPEMD160Digest class from the Bouncy Castle cryptography library, along with the Hex class from the same library for converting binary data to hexadecimal strings.
import org.bouncycastle.crypto.digests.RIPEMD160Digest
import org.bouncycastle.util.encoders.Hex
  1. Extending the RIPEMD160Digest class: The code extends the RIPEMD160Digest class with a new function called inOneGo. This function takes a byte array as input and calculates the RIPEMD-160 digest of that input in a single operation, without the need for intermediate buffers.
fun RIPEMD160Digest.inOneGo(input : ByteArray) : ByteArray
  1. Calculating the RIPEMD-160 digest: Inside the inOneGo function, the following steps are performed:
    • A byte array output is created with a size equal to the digest size of RIPEMD-160, which is 20 bytes.
    • The update method of the RIPEMD160Digest instance is called to update the digest with the input byte array.
    • The doFinal method is called to complete the digest calculation and store the result in the output byte array.
val output = ByteArray(digestSize)
update(input, 0, input.size)
doFinal(output, 0)
  1. Returning the digest: The inOneGo function returns the output byte array, which contains the RIPEMD-160 digest of the input byte array.

  2. Main function: The main function of the program is the entry point. It does the following:

    • Defines a byte array input containing the ASCII representation of the string "Rosetta Code."
    • Creates an instance of RIPEMD160Digest and calls its inOneGo function to calculate the digest of the input byte array.
    • Calls the encode method of the Hex class to convert the digest (which is a byte array) into a hexadecimal string.
    • Prints the hexadecimal string representation of the digest to the standard output.
fun main(args: Array<String>) {
   val input = "Rosetta Code".toByteArray(US_ASCII)
   val output = RIPEMD160Digest().inOneGo(input)

   Hex.encode(output, System.out)
   System.out.flush()
}

In summary, this Kotlin code snippet demonstrates how to use the Bouncy Castle cryptography library to efficiently calculate the RIPEMD-160 digest of a given input byte array in one operation, and then convert the digest to a hexadecimal string for display.

Source code in the kotlin programming language

import org.bouncycastle.crypto.digests.RIPEMD160Digest
import org.bouncycastle.util.encoders.Hex
import kotlin.text.Charsets.US_ASCII

fun RIPEMD160Digest.inOneGo(input : ByteArray) : ByteArray {
    val output = ByteArray(digestSize)

    update(input, 0, input.size)
    doFinal(output, 0)

    return output
}

fun main(args: Array<String>) {
    val input = "Rosetta Code".toByteArray(US_ASCII)
    val output = RIPEMD160Digest().inOneGo(input)

    Hex.encode(output, System.out)
    System.out.flush()
}


  

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