Update of /cvsroot/freenet/freenet/src/freenet/crypt
In directory sc8-pr-cvs1:/tmp/cvs-serv1629
Modified Files:
DSA.java
Log Message:
catch an ArithmeticException that's raised when bad DSA params try to be verified
Index: DSA.java
===================================================================
RCS file: /cvsroot/freenet/freenet/src/freenet/crypt/DSA.java,v
retrieving revision 1.1.1.1
retrieving revision 1.2
diff -u -w -r1.1.1.1 -r1.2
--- DSA.java 13 Jan 2002 05:24:23 -0000 1.1.1.1
+++ DSA.java 20 Oct 2003 16:05:16 -0000 1.2
@@ -71,6 +71,7 @@
public static boolean verify(DSAPublicKey kp,
DSASignature sig,
BigInteger m) {
+ try {
BigInteger w=sig.getS().modInverse(kp.getQ());
BigInteger u1=m.multiply(w).mod(kp.getQ());
BigInteger u2=sig.getR().multiply(w).mod(kp.getQ());
@@ -78,6 +79,12 @@
BigInteger v2=kp.getY().modPow(u2, kp.getP());
BigInteger v=v1.multiply(v2).mod(kp.getP()).mod(kp.getQ());
return v.equals(sig.getR());
+
+
+ //FIXME: is there a better way to handle this exception raised on the 'w='
line above?
+ } catch (ArithmeticException e) { // catch error raised by invalid data
+ return false; // and report that that data is bad.
+ }
}
public static void main(String[] args) throws Exception {
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