jellyfin-plugin-floatplane/doc/research/reference-sources/fn_PKCEManager.kt

package com.coulterpeterson.floatnative.data

import android.util.Base64
import java.security.MessageDigest
import java.security.SecureRandom

object PKCEManager {

    fun generateCodeVerifier(): String {
        val secureRandom = SecureRandom()
        val codeVerifier = ByteArray(32)
        secureRandom.nextBytes(codeVerifier)
        return Base64.encodeToString(codeVerifier, Base64.URL_SAFE or Base64.NO_WRAP or Base64.NO_PADDING)
    }

    fun generateCodeChallenge(verifier: String): String {
        val bytes = verifier.toByteArray(Charsets.US_ASCII)
        val md = MessageDigest.getInstance("SHA-256")
        val digest = md.digest(bytes)
        return Base64.encodeToString(digest, Base64.URL_SAFE or Base64.NO_WRAP or Base64.NO_PADDING)
    }
}