Hi everybody, i'm facing a strange error when i try to generate Key-Pair to be used for encryption purposes. I try to run the following code on Ubuntu:

KeyPairGenerator myPriPubKeys;

myPriPubKeys = KeyPairGenerator.getInstance("RSA");
SecureRandom myRandom = SecureRandom.getInstance("SHA1PRNG");

myPriPubKeys.initialize(1024, myRandom);
myKeyPair = myPriPubKeys.genKeyPair();

The error showing is:

genKeyPair failed: java.lang.ArithmeticException: negative exponent
java.lang.ArithmeticException: negative exponent
at java.math.BigInteger.pow(libgcj.so.81)
at gnu.java.security.key.dss.FIPS186.generateParameters(libgcj.so.81)
at gnu.java.security.key.dss.DSSKeyPairGenerator.generate(libgcj.so.81)
at gnu.java.security.jce.sig.KeyPairGeneratorAdapter.generateKeyPair(libgcj.so.81)
at java.security.KeyPairGenerator.genKeyPair(libgcj.so.81)

Can any one support.

BTW, i tried to run this code with window XP and it was working perfectly.

Thanks and waiting your replies.

Cu,
Ahmed Banihammad

Seems like you have some old arithmetic libraries. Have you tried updating your Java runtime ?

Thanks a lot.

This is exactly what i had to do..

Hi !
I also have the same matter, It's good , either in linux or in windows, with SUN JDK.
But in RedHat GNUClASS+jamvm, it's wrong as follow.what should I to do ?
Thank you !

genKeyPair failed: java.lang.ArithmeticException: negative exponent
java.lang.ArithmeticException: negative exponent
at java.math.BigInteger.pow(BigInteger.java:1001)
at gnu.java.security.key.dss.FIPS186.generateParameters(FIPS186.java:200)
at gnu.java.security.key.dss.DSSKeyPairGenerator.generate(DSSKeyPairGenerator.java:305)
at gnu.java.security.jce.sig.KeyPairGeneratorAdapter.generateKeyPair(KeyPairGeneratorAdapter.java:93)
at java.security.KeyPairGenerator.genKeyPair(KeyPairGenerator.java:289)
at cn.com.webinfo.security.RSA.generateKey(RSA.java:100)
at cn.com.webinfo.stest.MainRSA.main(MainRSA.java:23)
java.lang.NullPointerException
at cn.com.webinfo.security.RSA.generateKey(RSA.java:102)
at cn.com.webinfo.stest.MainRSA.main(MainRSA.java:23)
Generating private key is failure!

MainRSA.java:23 RSA.generateKey("001","prikeyRSA.dat", "pubkeyRSA.dat");
public static boolean generateKey(String id, String priFileName, String pubFileName) {
try {
KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA");
SecureRandom secrand = new SecureRandom();
secrand.setSeed(id.getBytes());
keygen.initialize(1024, secrand);
RSA.java:100 KeyPair keys = keygen.genKeyPair();

RSA.java:102 PrivateKey prikey = keys.getPrivate();
PublicKey pubkey = keys.getPublic();
.........