本文整理汇总了Java中org.bouncycastle.pqc.math.linearalgebra.BigIntUtils类的典型用法代码示例。如果您正苦于以下问题：Java BigIntUtils类的具体用法？Java BigIntUtils怎么用？Java BigIntUtils使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
BigIntUtils类属于org.bouncycastle.pqc.math.linearalgebra包，在下文中一共展示了BigIntUtils类的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: decode
import org.bouncycastle.pqc.math.linearalgebra.BigIntUtils; //导入依赖的package包/类
/**
* Decode a binary vector of length n and weight t into a number between 0
* and (n|t) (binomial coefficient). The result is given as a byte array of
* length floor[(s+7)/8], where s = floor[log(n|t)].
*
* @param n integer
* @param t integer
* @param vec the binary vector
* @return the decoded vector as a byte array
*/
public static byte[] decode(int n, int t, GF2Vector vec)
{
if ((vec.getLength() != n) || (vec.getHammingWeight() != t))
{
throw new IllegalArgumentException(
"vector has wrong length or hamming weight");
}
int[] vecArray = vec.getVecArray();
BigInteger bc = IntegerFunctions.binomial(n, t);
BigInteger d = ZERO;
int nn = n;
int tt = t;
for (int i = 0; i < n; i++)
{
bc = bc.multiply(BigInteger.valueOf(nn - tt)).divide(
BigInteger.valueOf(nn));
nn--;
int q = i >> 5;
int e = vecArray[q] & (1 << (i & 0x1f));
if (e != 0)
{
d = d.add(bc);
tt--;
if (nn == tt)
{
bc = ONE;
}
else
{
bc = bc.multiply(BigInteger.valueOf(tt + 1)).divide(
BigInteger.valueOf(nn - tt));
}
}
}
return BigIntUtils.toMinimalByteArray(d);
}