org.http4k.util.Hex.kt Maven / Gradle / Ivy

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package org.http4k.util

object Hex {
    fun hex(data: ByteArray): String = data.joinToString("") { (0xFF and it.toInt()).toString(16).padStart(2, '0') }

    fun unhex(data: String): ByteArray {
        check(data.length % 2 == 0) { "Must have an even length" }
        return data.chunked(2)
            .map { nextByte -> nextByte.toInt(16).toByte() }
            .toByteArray()
    }
}