Kotlin Hashing

Hashing is an important concept, it has numerous applications, and it’s at the core of many other computer science concepts.

HashUtils.kt is a very simple, yet very helpful snippet I’ve used in some of my applications when I need some basic hashing. It’s an extension function, one of Kotlin neat features.

	package com.isscroberto.onebreath.utils

	import java.security.MessageDigest

	enum class Algorithm(val code: String) {
	SHA1("SHA-1"), SHA256("SHA-256"), SHA512("SHA-512")
	}

	fun String.hash (algorithm: Algorithm): String {
	val hexArray = "0123456789ABCDEF"
	val bytes = MessageDigest.getInstance(algorithm.code).digest(this.toByteArray())

	val hash = StringBuilder(bytes.size * 2)
	bytes.forEach {
	val i = it.toInt()
	hash.append(hexArray[i shr 4 and 0x0f])
	hash.append(hexArray[i and 0x0f])
	}

	return hash.toString()
	}

view raw HashUtils.kt hosted with ❤ by GitHub

Usage:

val text = "hello"
val hashedText = text.hash(Algorithm.SHA256)

Reference:
https://www.samclarke.com/kotlin-hash-strings/

Kotlin Hashing

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