what-the-bank/sources/org/bouncycastle/crypto/signers/DSASigner.java

package org.bouncycastle.crypto.signers;

import java.math.BigInteger;
import java.security.SecureRandom;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DSA;
import org.bouncycastle.crypto.params.DSAKeyParameters;
import org.bouncycastle.crypto.params.DSAParameters;
import org.bouncycastle.crypto.params.DSAPrivateKeyParameters;
import org.bouncycastle.crypto.params.DSAPublicKeyParameters;
import org.bouncycastle.crypto.params.ParametersWithRandom;

/* loaded from: classes6.dex */
public class DSASigner implements DSA {
    private final DSAKCalculator kCalculator;
    private DSAKeyParameters key;
    private SecureRandom random;

    @Override // org.bouncycastle.crypto.DSA
    public boolean verifySignature(byte[] bArr, BigInteger bigInteger, BigInteger bigInteger2) {
        DSAParameters parameters = this.key.getParameters();
        BigInteger q = parameters.getQ();
        BigInteger calculateE = calculateE(q, bArr);
        BigInteger valueOf = BigInteger.valueOf(0L);
        if (valueOf.compareTo(bigInteger) >= 0 || q.compareTo(bigInteger) <= 0 || valueOf.compareTo(bigInteger2) >= 0 || q.compareTo(bigInteger2) <= 0) {
            return false;
        }
        BigInteger modInverse = bigInteger2.modInverse(q);
        BigInteger mod = calculateE.multiply(modInverse).mod(q);
        BigInteger mod2 = bigInteger.multiply(modInverse).mod(q);
        BigInteger p = parameters.getP();
        return parameters.getG().modPow(mod, p).multiply(((DSAPublicKeyParameters) this.key).getY().modPow(mod2, p)).mod(p).mod(q).equals(bigInteger);
    }

    protected SecureRandom initSecureRandom(boolean z, SecureRandom secureRandom) {
        if (z) {
            return secureRandom == null ? new SecureRandom() : secureRandom;
        }
        return null;
    }

    @Override // org.bouncycastle.crypto.DSA
    public void init(boolean z, CipherParameters cipherParameters) {
        DSAKeyParameters dSAKeyParameters;
        SecureRandom secureRandom;
        if (!z) {
            dSAKeyParameters = (DSAPublicKeyParameters) cipherParameters;
        } else {
            if (cipherParameters instanceof ParametersWithRandom) {
                ParametersWithRandom parametersWithRandom = (ParametersWithRandom) cipherParameters;
                this.key = (DSAPrivateKeyParameters) parametersWithRandom.getParameters();
                secureRandom = parametersWithRandom.getRandom();
                this.random = initSecureRandom((z || this.kCalculator.isDeterministic()) ? false : true, secureRandom);
            }
            dSAKeyParameters = (DSAPrivateKeyParameters) cipherParameters;
        }
        this.key = dSAKeyParameters;
        secureRandom = null;
        this.random = initSecureRandom((z || this.kCalculator.isDeterministic()) ? false : true, secureRandom);
    }

    @Override // org.bouncycastle.crypto.DSA
    public BigInteger[] generateSignature(byte[] bArr) {
        DSAParameters parameters = this.key.getParameters();
        BigInteger q = parameters.getQ();
        BigInteger calculateE = calculateE(q, bArr);
        BigInteger x = ((DSAPrivateKeyParameters) this.key).getX();
        if (this.kCalculator.isDeterministic()) {
            this.kCalculator.init(q, x, bArr);
        } else {
            this.kCalculator.init(q, this.random);
        }
        BigInteger nextK = this.kCalculator.nextK();
        BigInteger mod = parameters.getG().modPow(nextK, parameters.getP()).mod(q);
        return new BigInteger[]{mod, nextK.modInverse(q).multiply(calculateE.add(x.multiply(mod))).mod(q)};
    }

    private BigInteger calculateE(BigInteger bigInteger, byte[] bArr) {
        if (bigInteger.bitLength() >= (bArr.length << 3)) {
            return new BigInteger(1, bArr);
        }
        int bitLength = bigInteger.bitLength() / 8;
        byte[] bArr2 = new byte[bitLength];
        System.arraycopy(bArr, 0, bArr2, 0, bitLength);
        return new BigInteger(1, bArr2);
    }

    public DSASigner(DSAKCalculator dSAKCalculator) {
        this.kCalculator = dSAKCalculator;
    }

    public DSASigner() {
        this.kCalculator = new RandomDSAKCalculator();
    }
}