September 2017 Update

Task/RSA-code/Kotlin/rsa-code.kotlin

@@ -0,0 +1,28 @@
+// version 1.1.4-3
+
+import java.math.BigInteger
+
+fun main(args: Array<String>) {
+    val n = BigInteger("9516311845790656153499716760847001433441357")
+    val e = BigInteger("65537")
+    val d = BigInteger("5617843187844953170308463622230283376298685")
+    val c = Charsets.UTF_8
+    val plainText = "Rosetta Code"
+    println("PlainText : $plainText")
+    val bytes = plainText.toByteArray(c)
+    val plainNum = BigInteger(bytes)
+    println("As number : $plainNum")
+    if (plainNum > n) {
+        println("Plaintext is too long")
+        return
+    }
+
+    val enc = plainNum.modPow(e, n)
+    println("Encoded   : $enc")
+
+    val dec = enc.modPow(d, n)
+    println("Decoded   : $dec")
+
+    val decText = dec.toByteArray().toString(c)
+    println("As text   : $decText")
+}