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/*
* @test
* @bug 4513830
* @summary Verify the output size returned by AES cipher.getOutputSize
* method in DECRYPT mode does not add extra bytes for padding
* @author Valerie Peng
*/
import java.io.PrintStream;
import java.security.*;
import java.security.spec.*;
import java.util.Random;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.Provider;
import com.sun.crypto.provider.*;
public class Test4513830 {
private static final String ALGO = "AES";
private static final String MODE = "ECB";
private static final String PADDING = "PKCS5Padding";
private static final int KEYSIZE = 16; // in bytes
private static final int TEXTLENGTHS[] = {
16, 17, 18, 19, 20, 21, 22, 23 };
public boolean execute() throws Exception {
Random rdm = new Random();
byte[] plainText=new byte[125];
rdm.nextBytes(plainText);
Cipher ci = Cipher.getInstance(ALGO+"/"+MODE+"/"+PADDING, "SunJCE");
// TEST FIX 4513830
KeyGenerator kg = KeyGenerator.getInstance(ALGO, "SunJCE");
kg.init(KEYSIZE*8);
SecretKey key = kg.generateKey();
ci.init(Cipher.DECRYPT_MODE, key);
int recoveredTextLength = ci.getOutputSize(16);
if (recoveredTextLength != 16) {
throw new Exception("output size should not increase when decrypting!");
}
// BONUS TESTS
// 1. call getOutputSize with various lengths and see if
// the returned size is correct.
for (int i=0; i<TEXTLENGTHS.length; i++) {
ci.init(Cipher.ENCRYPT_MODE, key);
int cipherTextLength = ci.getOutputSize(TEXTLENGTHS[i]);
if (cipherTextLength != 32) {
throw new Exception("output size " + cipherTextLength
+ " for input size " + TEXTLENGTHS[i]
+ " when encrypting is wrong!");
}
}
// passed all tests...hooray!
return true;
}
public static void main (String[] args) throws Exception {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
Test4513830 test = new Test4513830();
String testName = test.getClass().getName() + "[" + ALGO +
"/" + MODE + "/" + PADDING + "]";
if (test.execute()) {
System.out.println(testName + ": Passed!");
}
}
}