Key Pair EncDen in scratch file

KeyPairScratchPt_Br.kt

import java.security.*
import java.security.spec.PKCS8EncodedKeySpec
import java.security.spec.X509EncodedKeySpec
import javax.crypto.Cipher

private val ALGORITHM = "RSA"

fun generateKeyPair(): KeyPair {
    val keyGen: KeyPairGenerator = KeyPairGenerator.getInstance(ALGORITHM)
    val random: SecureRandom = SecureRandom.getInstance("SHA1PRNG", "SUN")

    keyGen.initialize(512, random)
    return keyGen.generateKeyPair()
}

fun encrypt(publicKey: ByteArray?, inputData: ByteArray?): ByteArray {
    val key = KeyFactory.getInstance(ALGORITHM)
        .generatePublic(X509EncodedKeySpec(publicKey))
    val cipher: Cipher = Cipher.getInstance(ALGORITHM)
    cipher.init(Cipher.ENCRYPT_MODE, key)
    return cipher.doFinal(inputData)
}

fun decrypt(privateKey: ByteArray?, inputData: ByteArray?): ByteArray {
    val key = KeyFactory.getInstance(ALGORITHM)
        .generatePrivate(PKCS8EncodedKeySpec(privateKey))
    val cipher: Cipher = Cipher.getInstance(ALGORITHM)
    cipher.init(Cipher.DECRYPT_MODE, key)
    return cipher.doFinal(inputData)
}

val keyPair = generateKeyPair()

val public = keyPair.public.encoded
val private = keyPair.private.encoded

val targetString = "Oi eu sou o tigrão"

val encrypted = encrypt(public, targetString.toByteArray())

println("Resultado encriptado -> ${String(encrypted)}")

val decrypt = decrypt(private, encrypted)

val decryptedResult = String(decrypt)

println("Resultado decriptado -> $decryptedResult")