// 
// Decompiled by Procyon v0.6.0
// 

package com.google.crypto.tink.signature.internal;

import java.security.spec.EllipticCurve;
import com.google.crypto.tink.subtle.Bytes;
import java.security.PrivateKey;
import java.security.Signature;
import com.google.crypto.tink.AccessesPartialKey;
import java.security.spec.ECParameterSpec;
import com.google.crypto.tink.signature.EcdsaParameters;
import java.security.spec.KeySpec;
import com.google.crypto.tink.subtle.EngineFactory;
import java.security.KeyFactory;
import java.security.spec.ECPrivateKeySpec;
import com.google.crypto.tink.InsecureSecretKeyAccess;
import com.google.crypto.tink.signature.EcdsaPrivateKey;
import com.google.crypto.tink.internal.ConscryptUtil;
import com.google.crypto.tink.subtle.SubtleUtil;
import java.security.GeneralSecurityException;
import com.google.crypto.tink.subtle.Enums;
import javax.annotation.Nullable;
import java.security.Provider;
import com.google.crypto.tink.subtle.EllipticCurves;
import java.security.interfaces.ECPrivateKey;
import com.google.crypto.tink.config.internal.TinkFipsUtil;
import com.google.errorprone.annotations.Immutable;
import com.google.crypto.tink.PublicKeySign;

@Immutable
public final class EcdsaSignJce implements PublicKeySign
{
    public static final TinkFipsUtil.AlgorithmFipsCompatibility FIPS;
    private static final byte[] EMPTY;
    private static final byte[] legacyMessageSuffix;
    private final ECPrivateKey privateKey;
    private final String signatureAlgorithm;
    private final EllipticCurves.EcdsaEncoding encoding;
    private final byte[] outputPrefix;
    private final byte[] messageSuffix;
    @Nullable
    private final Provider provider;
    
    private EcdsaSignJce(final ECPrivateKey privateKey, final Enums.HashType hash, final EllipticCurves.EcdsaEncoding encoding, final byte[] outputPrefix, final byte[] messageSuffix, final Provider provider) throws GeneralSecurityException {
        if (!EcdsaSignJce.FIPS.isCompatible()) {
            throw new GeneralSecurityException("Can not use ECDSA in FIPS-mode, as BoringCrypto is not available.");
        }
        this.privateKey = privateKey;
        this.signatureAlgorithm = SubtleUtil.toEcdsaAlgo(hash);
        this.encoding = encoding;
        this.outputPrefix = outputPrefix;
        this.messageSuffix = messageSuffix;
        this.provider = provider;
    }
    
    public EcdsaSignJce(final ECPrivateKey privateKey, final Enums.HashType hash, final EllipticCurves.EcdsaEncoding encoding) throws GeneralSecurityException {
        this(privateKey, hash, encoding, EcdsaSignJce.EMPTY, EcdsaSignJce.EMPTY, ConscryptUtil.providerOrNull());
    }
    
    public static PublicKeySign create(final EcdsaPrivateKey key) throws GeneralSecurityException {
        final Provider provider = ConscryptUtil.providerOrNull();
        return createWithProviderOrNull(key, provider);
    }
    
    public static PublicKeySign createWithProvider(final EcdsaPrivateKey key, final Provider provider) throws GeneralSecurityException {
        if (provider == null) {
            throw new NullPointerException("provider must not be null");
        }
        return createWithProviderOrNull(key, provider);
    }
    
    @AccessesPartialKey
    private static PublicKeySign createWithProviderOrNull(final EcdsaPrivateKey key, @Nullable final Provider provider) throws GeneralSecurityException {
        final Enums.HashType hashType = EcdsaVerifyJce.HASH_TYPE_CONVERTER.toProtoEnum(key.getParameters().getHashType());
        final EllipticCurves.EcdsaEncoding ecdsaEncoding = EcdsaVerifyJce.ENCODING_CONVERTER.toProtoEnum(key.getParameters().getSignatureEncoding());
        final EllipticCurves.CurveType curveType = EcdsaVerifyJce.CURVE_TYPE_CONVERTER.toProtoEnum(key.getParameters().getCurveType());
        final ECParameterSpec ecParams = EllipticCurves.getCurveSpec(curveType);
        final ECPrivateKeySpec spec = new ECPrivateKeySpec(key.getPrivateValue().getBigInteger(InsecureSecretKeyAccess.get()), ecParams);
        KeyFactory keyFactory;
        if (provider != null) {
            keyFactory = KeyFactory.getInstance("EC", provider);
        }
        else {
            keyFactory = EngineFactory.KEY_FACTORY.getInstance("EC");
        }
        final ECPrivateKey privateKey = (ECPrivateKey)keyFactory.generatePrivate(spec);
        return new EcdsaSignJce(privateKey, hashType, ecdsaEncoding, key.getOutputPrefix().toByteArray(), key.getParameters().getVariant().equals(EcdsaParameters.Variant.LEGACY) ? EcdsaSignJce.legacyMessageSuffix : EcdsaSignJce.EMPTY, provider);
    }
    
    private Signature getInstance(final String signatureAlgorithm) throws GeneralSecurityException {
        if (this.provider != null) {
            return Signature.getInstance(signatureAlgorithm, this.provider);
        }
        return EngineFactory.SIGNATURE.getInstance(signatureAlgorithm);
    }
    
    @Override
    public byte[] sign(final byte[] data) throws GeneralSecurityException {
        final Signature signer = this.getInstance(this.signatureAlgorithm);
        signer.initSign(this.privateKey);
        signer.update(data);
        if (this.messageSuffix.length > 0) {
            signer.update(this.messageSuffix);
        }
        byte[] signature = signer.sign();
        if (this.encoding == EllipticCurves.EcdsaEncoding.IEEE_P1363) {
            final EllipticCurve curve = this.privateKey.getParams().getCurve();
            signature = EllipticCurves.ecdsaDer2Ieee(signature, 2 * EllipticCurves.fieldSizeInBytes(curve));
        }
        if (this.outputPrefix.length == 0) {
            return signature;
        }
        return Bytes.concat(new byte[][] { this.outputPrefix, signature });
    }
    
    static {
        FIPS = TinkFipsUtil.AlgorithmFipsCompatibility.ALGORITHM_REQUIRES_BORINGCRYPTO;
        EMPTY = new byte[0];
        legacyMessageSuffix = new byte[] { 0 };
    }
}