diff options
Diffstat (limited to 'core/src/main/java/org/bouncycastle/pqc/crypto/gmss/util/GMSSRandom.java')
-rw-r--r-- | core/src/main/java/org/bouncycastle/pqc/crypto/gmss/util/GMSSRandom.java | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/core/src/main/java/org/bouncycastle/pqc/crypto/gmss/util/GMSSRandom.java b/core/src/main/java/org/bouncycastle/pqc/crypto/gmss/util/GMSSRandom.java deleted file mode 100644 index c6d30227..00000000 --- a/core/src/main/java/org/bouncycastle/pqc/crypto/gmss/util/GMSSRandom.java +++ /dev/null @@ -1,78 +0,0 @@ -package org.bouncycastle.pqc.crypto.gmss.util; - -import org.bouncycastle.crypto.Digest; - -/** - * This class provides a PRNG for GMSS - */ -public class GMSSRandom -{ - /** - * Hash function for the construction of the authentication trees - */ - private Digest messDigestTree; - - /** - * Constructor - * - * @param messDigestTree2 - */ - public GMSSRandom(Digest messDigestTree2) - { - - this.messDigestTree = messDigestTree2; - } - - /** - * computes the next seed value, returns a random byte array and sets - * outseed to the next value - * - * @param outseed byte array in which ((1 + SEEDin +RAND) mod 2^n) will be - * stored - * @return byte array of H(SEEDin) - */ - public byte[] nextSeed(byte[] outseed) - { - // RAND <-- H(SEEDin) - byte[] rand = new byte[outseed.length]; - messDigestTree.update(outseed, 0, outseed.length); - rand = new byte[messDigestTree.getDigestSize()]; - messDigestTree.doFinal(rand, 0); - - // SEEDout <-- (1 + SEEDin +RAND) mod 2^n - addByteArrays(outseed, rand); - addOne(outseed); - - // System.arraycopy(outseed, 0, outseed, 0, outseed.length); - - return rand; - } - - private void addByteArrays(byte[] a, byte[] b) - { - - byte overflow = 0; - int temp; - - for (int i = 0; i < a.length; i++) - { - temp = (0xFF & a[i]) + (0xFF & b[i]) + overflow; - a[i] = (byte)temp; - overflow = (byte)(temp >> 8); - } - } - - private void addOne(byte[] a) - { - - byte overflow = 1; - int temp; - - for (int i = 0; i < a.length; i++) - { - temp = (0xFF & a[i]) + overflow; - a[i] = (byte)temp; - overflow = (byte)(temp >> 8); - } - } -} |