what-the-bank/sources/org/bouncycastle/jcajce/provider/asymmetric/dh/KeyAgreementSpi.java

package org.bouncycastle.jcajce.provider.asymmetric.dh;

import java.math.BigInteger;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.SecretKey;
import javax.crypto.ShortBufferException;
import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.interfaces.DHPublicKey;
import javax.crypto.spec.DHParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.crypto.DerivationFunction;
import org.bouncycastle.crypto.agreement.kdf.DHKEKGenerator;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.jcajce.provider.asymmetric.util.BaseAgreementSpi;
import org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec;

/* loaded from: classes6.dex */
public class KeyAgreementSpi extends BaseAgreementSpi {
    private BigInteger g;
    private BigInteger p;
    private BigInteger result;
    private BigInteger x;

    @Override // javax.crypto.KeyAgreementSpi
    protected void engineInit(Key key, AlgorithmParameterSpec algorithmParameterSpec, SecureRandom secureRandom) throws InvalidKeyException, InvalidAlgorithmParameterException {
        DHParameterSpec params;
        if (!(key instanceof DHPrivateKey)) {
            throw new InvalidKeyException("DHKeyAgreement requires DHPrivateKey for initialisation");
        }
        DHPrivateKey dHPrivateKey = (DHPrivateKey) key;
        if (algorithmParameterSpec == null) {
            this.p = dHPrivateKey.getParams().getP();
            params = dHPrivateKey.getParams();
        } else {
            if (!(algorithmParameterSpec instanceof DHParameterSpec)) {
                if (!(algorithmParameterSpec instanceof UserKeyingMaterialSpec)) {
                    throw new InvalidAlgorithmParameterException("DHKeyAgreement only accepts DHParameterSpec");
                }
                this.p = dHPrivateKey.getParams().getP();
                this.g = dHPrivateKey.getParams().getG();
                this.ukmParameters = ((UserKeyingMaterialSpec) algorithmParameterSpec).getUserKeyingMaterial();
                BigInteger x = dHPrivateKey.getX();
                this.result = x;
                this.x = x;
            }
            params = (DHParameterSpec) algorithmParameterSpec;
            this.p = params.getP();
        }
        this.g = params.getG();
        BigInteger x2 = dHPrivateKey.getX();
        this.result = x2;
        this.x = x2;
    }

    @Override // javax.crypto.KeyAgreementSpi
    protected void engineInit(Key key, SecureRandom secureRandom) throws InvalidKeyException {
        if (!(key instanceof DHPrivateKey)) {
            throw new InvalidKeyException("DHKeyAgreement requires DHPrivateKey");
        }
        DHPrivateKey dHPrivateKey = (DHPrivateKey) key;
        this.p = dHPrivateKey.getParams().getP();
        this.g = dHPrivateKey.getParams().getG();
        BigInteger x = dHPrivateKey.getX();
        this.result = x;
        this.x = x;
    }

    @Override // org.bouncycastle.jcajce.provider.asymmetric.util.BaseAgreementSpi, javax.crypto.KeyAgreementSpi
    public byte[] engineGenerateSecret() throws IllegalStateException {
        if (this.x != null) {
            return super.engineGenerateSecret();
        }
        throw new IllegalStateException("Diffie-Hellman not initialised.");
    }

    @Override // org.bouncycastle.jcajce.provider.asymmetric.util.BaseAgreementSpi, javax.crypto.KeyAgreementSpi
    public SecretKey engineGenerateSecret(String str) throws NoSuchAlgorithmException {
        if (this.x != null) {
            return str.equals("TlsPremasterSecret") ? new SecretKeySpec(trimZeroes(bigIntToBytes(this.result)), str) : super.engineGenerateSecret(str);
        }
        throw new IllegalStateException("Diffie-Hellman not initialised.");
    }

    @Override // org.bouncycastle.jcajce.provider.asymmetric.util.BaseAgreementSpi, javax.crypto.KeyAgreementSpi
    public int engineGenerateSecret(byte[] bArr, int i) throws IllegalStateException, ShortBufferException {
        if (this.x != null) {
            return super.engineGenerateSecret(bArr, i);
        }
        throw new IllegalStateException("Diffie-Hellman not initialised.");
    }

    @Override // javax.crypto.KeyAgreementSpi
    protected Key engineDoPhase(Key key, boolean z) throws InvalidKeyException, IllegalStateException {
        if (this.x == null) {
            throw new IllegalStateException("Diffie-Hellman not initialised.");
        }
        if (!(key instanceof DHPublicKey)) {
            throw new InvalidKeyException("DHKeyAgreement doPhase requires DHPublicKey");
        }
        DHPublicKey dHPublicKey = (DHPublicKey) key;
        if (!dHPublicKey.getParams().getG().equals(this.g) || !dHPublicKey.getParams().getP().equals(this.p)) {
            throw new InvalidKeyException("DHPublicKey not for this KeyAgreement!");
        }
        if (z) {
            this.result = dHPublicKey.getY().modPow(this.x, this.p);
            return null;
        }
        BigInteger modPow = dHPublicKey.getY().modPow(this.x, this.p);
        this.result = modPow;
        return new BCDHPublicKey(modPow, dHPublicKey.getParams());
    }

    @Override // org.bouncycastle.jcajce.provider.asymmetric.util.BaseAgreementSpi
    public byte[] calcSecret() {
        return bigIntToBytes(this.result);
    }

    protected byte[] bigIntToBytes(BigInteger bigInteger) {
        int bitLength = (this.p.bitLength() + 7) / 8;
        byte[] byteArray = bigInteger.toByteArray();
        if (byteArray.length == bitLength) {
            return byteArray;
        }
        if (byteArray[0] != 0 || byteArray.length != bitLength + 1) {
            byte[] bArr = new byte[bitLength];
            System.arraycopy(byteArray, 0, bArr, bitLength - byteArray.length, byteArray.length);
            return bArr;
        }
        int length = byteArray.length - 1;
        byte[] bArr2 = new byte[length];
        System.arraycopy(byteArray, 1, bArr2, 0, length);
        return bArr2;
    }

    /* loaded from: classes6.dex */
    public static class DHwithRFC2631KDF extends KeyAgreementSpi {
        public DHwithRFC2631KDF() {
            super("DHwithRFC2631KDF", new DHKEKGenerator(new SHA1Digest()));
        }
    }

    public KeyAgreementSpi(String str, DerivationFunction derivationFunction) {
        super(str, derivationFunction);
    }

    public KeyAgreementSpi() {
        super("Diffie-Hellman", null);
    }
}