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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
* This code is free software ; you can redistribute it and / or modify it
* under the terms of the GNU General Public License version 2 only , as
* published by the Free Software Foundation .
*
* This code is distributed in the hope that it will be useful , but WITHOUT
* ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License
* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
*
* Please contact Oracle , 500 Oracle Parkway , Redwood Shores , CA 94065 USA
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*/
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.NamedParameterSpec;
import java.util.ArrayList;
import java.util.List;
/*
* @ test
* @ bug 8209632
* @ summary Test behaviour of Signature instance by re - using it multiple times
* in different way .
* @ run main EdDSAReuseTest
*/
public class EdDSAReuseTest {
private static final String EDDSA = "EdDSA" ;
private static final String ED25519 = "Ed25519" ;
private static final String ED448 = "Ed448" ;
private static final String PROVIDER = "SunEC" ;
private static final String MSG = "TEST" ;
private static final int REUSE = 20 ;
private static final int ONCE = 1 ;
private static final int TENTH = 10 ;
private static final int FIFTH = 5 ;
public static void main(String[] args) throws Exception {
for (boolean initKey : new boolean []{true , false }) {
// Sign and Verify with data update once
test(PROVIDER, EDDSA, null , initKey, ONCE, ONCE);
test(PROVIDER, ED25519, ED25519, initKey, ONCE, ONCE);
test(PROVIDER, ED448, ED448, initKey, ONCE, ONCE);
// Sign and Verify with data update 10 times
test(PROVIDER, EDDSA, null , initKey, TENTH, TENTH);
test(PROVIDER, ED25519, ED25519, initKey, TENTH, TENTH);
test(PROVIDER, ED448, ED448, initKey, TENTH, TENTH);
// Sign and Verify with data update unmatched number of times
test(PROVIDER, EDDSA, null , initKey, TENTH, FIFTH);
test(PROVIDER, ED25519, ED25519, initKey, TENTH, FIFTH);
test(PROVIDER, ED448, ED448, initKey, TENTH, FIFTH);
}
}
private static void test(String provider, String name, Object param,
boolean initKey, int signUpdate, int verifyUpdate)
throws Exception {
System.out.printf("Case for signature name: %s, param: %s,"
+ " initialize signature instance before each operation: %s%n" ,
name, param, initKey);
KeyPairGenerator kpg = KeyPairGenerator.getInstance(name, provider);
if (param != null ) {
kpg.initialize(new NamedParameterSpec((String) param));
}
KeyPair kp = kpg.generateKeyPair();
Signature sig = Signature.getInstance(name, provider);
testAPI(sig, kp, initKey, signUpdate, verifyUpdate);
System.out.println("Passed." );
}
private static void testAPI(Signature sig, KeyPair kp, boolean initKey,
int signUpdate, int verifyUpdate) throws Exception {
sig.initSign(kp.getPrivate());
List<byte []> signatures = new ArrayList<>();
// Re-use the signature instance 20 times
for (int i = 0 ; i < REUSE; i++) {
signatures.add(sign(sig, kp.getPrivate(), MSG, initKey, signUpdate));
}
System.out.printf("Generated signatures %s times%n" , signatures.size());
sig.initVerify(kp.getPublic());
for (byte [] sign : signatures) {
// Verification will pass when message update matches with
// the same used for sign
if (verify(sig, kp.getPublic(), MSG, sign, initKey, verifyUpdate)
!= (signUpdate == verifyUpdate)) {
throw new RuntimeException(
"Verification succed with unmatched message" );
}
}
System.out.printf("Verified signatures %s times%n" , signatures.size());
}
private static byte [] sign(Signature sig, PrivateKey priKey, String msg,
boolean initKey, int signUpdate) throws Exception {
if (initKey) {
sig.initSign(priKey);
}
for (int update = 0 ; update < signUpdate; update++) {
sig.update(msg.getBytes());
}
return sig.sign();
}
private static boolean verify(Signature sig, PublicKey pubKey, String msg,
byte [] sign, boolean initKey, int verifyUpdate) throws Exception {
if (initKey) {
sig.initVerify(pubKey);
}
for (int update = 0 ; update < verifyUpdate; update++) {
sig.update(msg.getBytes());
}
return sig.verify(sign);
}
}
Messung V0.5 in Prozent C=91 H=92 G=91
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-10-11)
¤
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