import org.bouncycastle.jcajce.provider.digest.*

fun main() {
    val text = "Hello, world!"

    // SHA256
    val sha256 = SHA256.Digest()
    val sha256Hash = sha256.digest(text.toByteArray())
    println("SHA256 hash: ${bytesToHex(sha256Hash)}")

    // SHA3-256
    val sha3_256 = SHA3.Digest256()
    val sha3_256Hash = sha3_256.digest(text.toByteArray())
    println("SHA3-256 hash: ${bytesToHex(sha3_256Hash)}")

    // Keccak-256
    val keccak_256 = Keccak.Digest256()
    val keccak_256Hash = keccak_256.digest(text.toByteArray())
    println("Keccak-256 hash: ${bytesToHex(keccak_256Hash)}")

    // BLAKE2s
    val blake2s = Blake2s.Digest()
    val blake2sHash = blake2s.digest(text.toByteArray())
    println("BLAKE2s hash: ${bytesToHex(blake2sHash)}")

    // RIPEMD160
    val ripemd160 = RIPEMD160.Digest()
    val ripemd160Hash = ripemd160.digest(text.toByteArray())
    println("RIPEMD160 hash: ${bytesToHex(ripemd160Hash)}")
}

private fun bytesToHex(bytes: ByteArray): String {
    val hexChars = CharArray(bytes.size * 2)
    for (i in bytes.indices) {
        val v = bytes[i].toInt() and 0xFF
        hexChars[i * 2] = hexArray[v ushr 4]
        hexChars[i * 2 + 1] = hexArray[v and 0x0F]
    }
    return String(hexChars)
}

private val hexArray = "0123456789ABCDEF".toCharArray()
by

Kotlin online compiler

Write, Run & Share Kotlin code online using OneCompiler’s Kotlin online compiler for free. It’s a modern and fast online playground for Kotlin, supporting the latest version and ideal for learning, experimenting, and sharing code instantly.

About Kotlin

Kotlin is a statically typed, modern programming language developed by JetBrains. It runs on the JVM and is fully interoperable with Java. Kotlin is concise, expressive, and safe, and it’s officially supported by Google for Android app development.

Sample Code

The following is a simple Kotlin program that prints a greeting:

fun main() {
    println("Hello, OneCompiler!")
}

Taking inputs (stdin)

OneCompiler’s Kotlin editor supports stdin. You can provide input using the I/O tab. Here's a sample program that reads a line of input and prints a greeting:

fun main() {
    print("Enter your name: ")
    val name = readLine()
    println("Hello, $name")
}

Syntax Basics

Variables

val name: String = "OneCompiler"  // Immutable
var age: Int = 25                 // Mutable

Kotlin supports type inference, so explicit types are optional:

val city = "Hyderabad"
var count = 10

Conditionals

val score = 85
if (score >= 50) {
    println("Pass")
} else {
    println("Fail")
}

Loops

For loop

for (i in 1..5) {
    println(i)
}

While loop

var i = 1
while (i <= 5) {
    println(i)
    i++
}

Do-While loop

var j = 1
do {
    println(j)
    j++
} while (j <= 5)

Functions

fun add(a: Int, b: Int): Int {
    return a + b
}

fun greet(name: String) = "Hello, $name"

Collections

val items = listOf("apple", "banana", "cherry")
for (item in items) {
    println(item)
}

This guide provides a quick reference to Kotlin programming syntax and features. Start coding in Kotlin using OneCompiler’s Kotlin online compiler today!