+2001-08-17 Mark J Roberts <mjr@anarcast.net>
+
+ * java/math/BigInteger.java (randBytes): New method.
+ (BigInteger(int,Random)): Use randBytes.
+
2001-08-17 Tom Tromey <tromey@redhat.com>
* gnu/gcj/convert/IOConverter.java: Add `646' alias.
}
public BigInteger(int numBits, Random rnd)
+ {
+ this(1, randBytes(numBits, rnd));
+ }
+
+ private static byte[] randBytes(int numBits, Random rnd)
{
if (numBits < 0)
throw new IllegalArgumentException();
- // Result is always positive so tack on an extra zero word, it will be
- // canonicalized out later if necessary.
- int nwords = numBits / 32 + 2;
- words = new int[nwords];
- words[--nwords] = 0;
- words[--nwords] = rnd.nextInt() >>> (numBits % 32);
- while (--nwords >= 0)
- words[nwords] = rnd.nextInt();
-
- BigInteger result = make(words, words.length);
- this.ival = result.ival;
- this.words = result.words;
+ int extra = numBits % 8;
+ byte[] b = new byte[numBits / 8 + (extra > 0 ? 1 : 0)];
+ rnd.nextBytes(b);
+ if (extra > 0)
+ b[0] &= ~((~0) << (8 - extra));
+ return b;
}
public BigInteger(int bitLength, int certainty, Random rnd)