73 lines
2.9 KiB
Java
73 lines
2.9 KiB
Java
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package org.bouncycastle.crypto.generators;
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import java.math.BigInteger;
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import java.security.SecureRandom;
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import org.bouncycastle.crypto.digests.SHA256Digest;
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import org.bouncycastle.crypto.params.CramerShoupParameters;
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import org.bouncycastle.crypto.params.DHParameters;
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import org.bouncycastle.util.BigIntegers;
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/* loaded from: classes6.dex */
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public class CramerShoupParametersGenerator {
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private static final BigInteger ONE = BigInteger.valueOf(1);
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private int certainty;
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private SecureRandom random;
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private int size;
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public void init(int i, int i2, SecureRandom secureRandom) {
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this.size = i;
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this.certainty = i2;
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this.random = secureRandom;
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}
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/* loaded from: classes6.dex */
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static class ParametersHelper {
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private static final BigInteger TWO = BigInteger.valueOf(2);
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static BigInteger selectGenerator(BigInteger bigInteger, SecureRandom secureRandom) {
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BigInteger modPow;
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BigInteger subtract = bigInteger.subtract(TWO);
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do {
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BigInteger bigInteger2 = TWO;
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modPow = BigIntegers.createRandomInRange(bigInteger2, subtract, secureRandom).modPow(bigInteger2, bigInteger);
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} while (modPow.equals(CramerShoupParametersGenerator.ONE));
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return modPow;
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}
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static BigInteger[] generateSafePrimes(int i, int i2, SecureRandom secureRandom) {
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BigInteger bigInteger;
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BigInteger add;
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while (true) {
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bigInteger = new BigInteger(i - 1, 2, secureRandom);
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add = bigInteger.shiftLeft(1).add(CramerShoupParametersGenerator.ONE);
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if (!add.isProbablePrime(i2) || (i2 > 2 && !bigInteger.isProbablePrime(i2))) {
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}
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}
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return new BigInteger[]{add, bigInteger};
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}
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private ParametersHelper() {
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}
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}
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public CramerShoupParameters generateParameters(DHParameters dHParameters) {
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BigInteger selectGenerator;
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BigInteger p = dHParameters.getP();
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BigInteger g = dHParameters.getG();
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do {
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selectGenerator = ParametersHelper.selectGenerator(p, this.random);
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} while (g.equals(selectGenerator));
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return new CramerShoupParameters(p, g, selectGenerator, new SHA256Digest());
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}
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public CramerShoupParameters generateParameters() {
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BigInteger selectGenerator;
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BigInteger bigInteger = ParametersHelper.generateSafePrimes(this.size, this.certainty, this.random)[1];
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BigInteger selectGenerator2 = ParametersHelper.selectGenerator(bigInteger, this.random);
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do {
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selectGenerator = ParametersHelper.selectGenerator(bigInteger, this.random);
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} while (selectGenerator2.equals(selectGenerator));
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return new CramerShoupParameters(bigInteger, selectGenerator2, selectGenerator, new SHA256Digest());
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}
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}
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