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| author | Mark J Roberts <mjr@anarcast.net> | 2001-08-17 22:21:02 +0000 |
|---|---|---|
| committer | Tom Tromey <tromey@gcc.gnu.org> | 2001-08-17 22:21:02 +0000 |
| commit | 62ee966e9ce816512ee032fbacf9e8cbd0d9ab31 (patch) | |
| tree | 0b1fec8feb4b6c2e03281102ecfbcbd66e06c5c6 /libjava | |
| parent | 2d76cb1aba961fe2dc84fd3b1dad04181affd103 (diff) | |
| download | gcc-62ee966e9ce816512ee032fbacf9e8cbd0d9ab31.zip gcc-62ee966e9ce816512ee032fbacf9e8cbd0d9ab31.tar.gz gcc-62ee966e9ce816512ee032fbacf9e8cbd0d9ab31.tar.bz2 | |
BigInteger.java (randBytes): New method.
2001-08-17 Mark J Roberts <mjr@anarcast.net>
* java/math/BigInteger.java (randBytes): New method.
(BigInteger(int,Random)): Use randBytes.
From-SVN: r44984
Diffstat (limited to 'libjava')
| -rw-r--r-- | libjava/ChangeLog | 5 | ||||
| -rw-r--r-- | libjava/java/math/BigInteger.java | 23 |
2 files changed, 16 insertions, 12 deletions
diff --git a/libjava/ChangeLog b/libjava/ChangeLog index 12c86fc..1567a3d 100644 --- a/libjava/ChangeLog +++ b/libjava/ChangeLog @@ -1,3 +1,8 @@ +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. diff --git a/libjava/java/math/BigInteger.java b/libjava/java/math/BigInteger.java index e74c5e1..b9bfee6 100644 --- a/libjava/java/math/BigInteger.java +++ b/libjava/java/math/BigInteger.java @@ -144,21 +144,20 @@ public class BigInteger extends Number implements Comparable 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) |