How to resolve the algorithm RIPEMD-160 step by step in the Kotlin programming language
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:
- Importing the necessary libraries: The code imports the
RIPEMD160Digest
class from the Bouncy Castle cryptography library, along with theHex
class from the same library for converting binary data to hexadecimal strings.
import org.bouncycastle.crypto.digests.RIPEMD160Digest
import org.bouncycastle.util.encoders.Hex
- Extending the RIPEMD160Digest class: The code extends the
RIPEMD160Digest
class with a new function calledinOneGo
. 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
- 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 theRIPEMD160Digest
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 theoutput
byte array.
- A byte array
val output = ByteArray(digestSize)
update(input, 0, input.size)
doFinal(output, 0)
-
Returning the digest: The
inOneGo
function returns theoutput
byte array, which contains the RIPEMD-160 digest of the input byte array. -
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 itsinOneGo
function to calculate the digest of theinput
byte array. - Calls the
encode
method of theHex
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.
- Defines a byte array
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()
}
You may also check:How to resolve the algorithm N'th step by step in the Mathematica/Wolfram Language programming language
You may also check:How to resolve the algorithm Balanced ternary step by step in the Icon and Unicon programming language
You may also check:How to resolve the algorithm Average loop length step by step in the Java programming language
You may also check:How to resolve the algorithm Hailstone sequence step by step in the Go programming language
You may also check:How to resolve the algorithm One of n lines in a file step by step in the Phix programming language