70 lines
2.5 KiB
Java
70 lines
2.5 KiB
Java
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package org.bouncycastle.util;
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import java.math.BigInteger;
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import java.security.SecureRandom;
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/* loaded from: classes6.dex */
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public final class BigIntegers {
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private static final int MAX_ITERATIONS = 1000;
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private static final BigInteger ZERO = BigInteger.valueOf(0);
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public static BigInteger fromUnsignedByteArray(byte[] bArr, int i, int i2) {
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if (i != 0 || i2 != bArr.length) {
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byte[] bArr2 = new byte[i2];
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System.arraycopy(bArr, i, bArr2, 0, i2);
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bArr = bArr2;
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}
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return new BigInteger(1, bArr);
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}
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public static BigInteger fromUnsignedByteArray(byte[] bArr) {
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return new BigInteger(1, bArr);
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}
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public static BigInteger createRandomInRange(BigInteger bigInteger, BigInteger bigInteger2, SecureRandom secureRandom) {
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int compareTo = bigInteger.compareTo(bigInteger2);
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if (compareTo >= 0) {
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if (compareTo <= 0) {
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return bigInteger;
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}
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throw new IllegalArgumentException("'min' may not be greater than 'max'");
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}
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if (bigInteger.bitLength() > bigInteger2.bitLength() / 2) {
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return createRandomInRange(ZERO, bigInteger2.subtract(bigInteger), secureRandom).add(bigInteger);
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}
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for (int i = 0; i < 1000; i++) {
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BigInteger bigInteger3 = new BigInteger(bigInteger2.bitLength(), secureRandom);
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if (bigInteger3.compareTo(bigInteger) >= 0 && bigInteger3.compareTo(bigInteger2) <= 0) {
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return bigInteger3;
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}
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}
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return new BigInteger(bigInteger2.subtract(bigInteger).bitLength() - 1, secureRandom).add(bigInteger);
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}
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public static byte[] asUnsignedByteArray(BigInteger bigInteger) {
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byte[] byteArray = bigInteger.toByteArray();
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if (byteArray[0] != 0) {
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return byteArray;
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}
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int length = byteArray.length - 1;
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byte[] bArr = new byte[length];
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System.arraycopy(byteArray, 1, bArr, 0, length);
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return bArr;
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}
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public static byte[] asUnsignedByteArray(int i, BigInteger bigInteger) {
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byte[] byteArray = bigInteger.toByteArray();
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if (byteArray.length == i) {
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return byteArray;
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}
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int i2 = byteArray[0] == 0 ? 1 : 0;
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int length = byteArray.length - i2;
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if (length > i) {
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throw new IllegalArgumentException("standard length exceeded for value");
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}
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byte[] bArr = new byte[i];
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System.arraycopy(byteArray, i2, bArr, i - length, length);
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return bArr;
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}
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}
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