var BN=Import("zklBigNum");

n:=BN("9516311845790656153499716760847001433441357");
e:=BN("65537");
d:=BN("5617843187844953170308463622230283376298685");

const plaintext="Rossetta Code";
pt:=BN(Data(Int,0,plaintext));  // convert string (as stream of bytes) to big int
if(pt>n) throw(Exception.ValueError("Message is too large"));

println("Plain text: ",plaintext);
println("As Int:     ",pt);
ct:=pt.powm(e,n);  println("Encoded:    ",ct);
pt =ct.powm(d,n);  println("Decoded:    ",pt);
txt:=pt.toData().text; // convert big int to bytes, treat as string
println("As String:  ",txt);