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() | |
| } |
Usage:
val text = "hello" val hashedText = text.hash(Algorithm.SHA256)
Reference:
https://www.samclarke.com/kotlin-hash-strings/
