+2003-02-10 Raif S. Naffah <raif@fl.net.au>
+
+ * gnu/java/security/provider/SHA1PRNG.java (ensureIsSeeded): new
+ method used to ensure seeding has occurred and that a specific
+ seed can be set and used.
+
2003-02-10 Ranjit Mathew <rmathew@hotmail.com>
* java/lang/Win32Process.java (destroy): Declare as native.
/* SHA1PRNG.java --- Secure Random SPI SHA1PRNG
- Copyright (C) 1999, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2001, 2003 Free Software Foundation, Inc.
This file is part of GNU Classpath.
byte data[];
int seedpos;
int datapos;
+ private boolean seeded = false; // set to true when we seed this
public SHA1PRNG()
{
try {
digest = MessageDigest.getInstance("SHA");
} catch ( NoSuchAlgorithmException nsae) {
- System.out.println("Failed to find SHA Message Digest: " + nsae);
- nsae.printStackTrace();
+// System.out.println("Failed to find SHA Message Digest: " + nsae);
+// nsae.printStackTrace();
+ throw new InternalError ("no SHA implementation found");
}
seed = new byte[20];
seedpos = 0;
data = new byte[40];
- datapos = 0;
-
- new Random().nextBytes(seed);
-
- byte digestdata[];
- digestdata = digest.digest( data );
- System.arraycopy( digestdata, 0, data, 0, 20);
-
+ datapos = 20; // try to force hashing a first block
}
public void engineSetSeed(byte[] seed)
public void engineNextBytes(byte[] bytes)
{
+ ensureIsSeeded ();
int loc = 0;
while (loc < bytes.length)
{
engineNextBytes( tmp );
return tmp;
}
+
+ private void ensureIsSeeded()
+ {
+ if (!seeded)
+ {
+ new Random(0L).nextBytes(seed);
+
+ byte[] digestdata = digest.digest(data);
+ System.arraycopy(digestdata, 0, data, 0, 20);
+
+ seeded = true;
+ }
+ }
+
}