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import java.io.*;
import com.herumi.mcl.*;
/*
ElgamalTest [ecParam]
ecParam = secp192k1, NIST_P224, ...
hashParam = hash224, hash384, ...
*/
public class ElgamalTest {
static {
String lib = "mcl_elgamal";
String libName = System.mapLibraryName(lib);
System.out.println("libName : " + libName);
System.loadLibrary(lib);
}
public static void assertEquals(String msg, int x, int y) {
if (x == y) {
System.out.println("OK : " + msg);
} else {
System.out.println("NG : " + msg + ", x = " + x + ", y = " + y);
}
}
public static void assertBool(String msg, boolean b) {
if (b) {
System.out.println("OK : " + msg);
} else {
System.out.println("NG : " + msg);
}
}
public static void main(String argv[]) {
try {
String ecStr = "secp192k1";
String hashStr = "sha224";
for (int i = 0; i < argv.length; i++) {
if (argv[i].equals("-e") && i < argv.length - 1) {
ecStr = argv[i + 1];
i++;
} else
if (argv[i].equals("-h") && i < argv.length - 1) {
hashStr = argv[i + 1];
i++;
}
}
String param = ecStr + " " + hashStr;
System.out.println("param=" + param);
Elgamal.SystemInit(param);
String prvStr = "";
String pubStr = "";
{
PrivateKey prv = new PrivateKey();
prv.init();
prvStr = prv.toStr();
PublicKey pub = prv.getPublicKey();
pubStr = pub.toStr();
}
int m = 1234;
CipherText c = new CipherText();
PublicKey pub = new PublicKey();
pub.fromStr(pubStr);
pub.enc(c, m);
PrivateKey prv = new PrivateKey();
prv.fromStr(prvStr);
prv.setCache(0, 60000);
int dec = prv.dec(c);
// verify dec(enc(m)) == m
assertEquals("dec(enc(m)) == m", m, dec);
// verify toStr, fromStr
{
String cStr = c.toStr();
CipherText c2 = new CipherText();
c2.fromStr(cStr);
int dec2 = prv.dec(c2);
assertEquals("fromStr(toStr(CipherText) == CipherText", dec, dec2);
}
// verify dec(enc(str)) == str
pub.enc(c, "1234");
dec = prv.dec(c);
assertEquals("dec(enc(str)) == str", m, dec);
// verify dec(mul(enc(m), 3)) == m * 3
c.mul(3);
m *= 3;
dec = prv.dec(c);
assertEquals("mul(int)", m, dec);
// verify dec(mul(enc(m), "10")) == m * 10
c.mul("10");
m *= 10;
dec = prv.dec(c);
assertEquals("mul(str)", m, dec);
// convert str
{
String s = c.toStr();
CipherText c2 = new CipherText();
c2.fromStr(s);
dec = prv.dec(c);
assertEquals("fromStr", m, dec);
}
// rerandomize
pub.rerandomize(c);
dec = prv.dec(c);
assertEquals("rerandomize", m, dec);
int m2 = 12345;
// verify dec(add(enc(m), m2)) == m + m2
pub.add(c, m2);
m += m2;
dec = prv.dec(c);
assertEquals("pub.add(int)", m, dec);
pub.add(c, "993");
m += 993;
dec = prv.dec(c);
assertEquals("pub.add(str)", m, dec);
// string test
String m3 = "-2000000";
String m4 = "2001234";
CipherText c2 = new CipherText();
SWIGTYPE_p_bool b = Elgamal.new_p_bool();
pub.enc(c, m3);
dec = prv.dec(c, b);
assertBool("expect dec fail", !Elgamal.p_bool_value(b));
pub.enc(c2, m4);
dec = prv.dec(c2, b);
assertBool("expect dec fail", !Elgamal.p_bool_value(b));
c.add(c2); // m3 + m4
dec = prv.dec(c, b);
assertEquals("int add", 1234, dec);
assertBool("expect dec success", Elgamal.p_bool_value(b));
Elgamal.delete_p_bool(b);
} catch (RuntimeException e) {
System.out.println("unknown exception :" + e);
}
}
}
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