| // Copyright 2017 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| package com.google.crypto.tink.subtle; |
| |
| import com.google.crypto.tink.PublicKeySign; |
| import com.google.crypto.tink.config.TinkFips; |
| import com.google.crypto.tink.subtle.EllipticCurves.EcdsaEncoding; |
| import com.google.crypto.tink.subtle.Enums.HashType; |
| import com.google.errorprone.annotations.Immutable; |
| import java.security.GeneralSecurityException; |
| import java.security.Signature; |
| import java.security.interfaces.ECPrivateKey; |
| import java.security.spec.EllipticCurve; |
| |
| /** |
| * ECDSA signing with JCE. |
| * |
| * @since 1.0.0 |
| */ |
| @Immutable |
| public final class EcdsaSignJce implements PublicKeySign { |
| public static final TinkFips.AlgorithmFipsCompatibility FIPS = |
| TinkFips.AlgorithmFipsCompatibility.ALGORITHM_REQUIRES_BORINGCRYPTO; |
| |
| @SuppressWarnings("Immutable") |
| private final ECPrivateKey privateKey; |
| |
| private final String signatureAlgorithm; |
| private final EcdsaEncoding encoding; |
| |
| public EcdsaSignJce(final ECPrivateKey priv, HashType hash, EcdsaEncoding encoding) |
| throws GeneralSecurityException { |
| if (!FIPS.isCompatible()) { |
| throw new GeneralSecurityException( |
| "Can not use ECDSA in FIPS-mode, as BoringCrypto is not available."); |
| } |
| |
| this.privateKey = priv; |
| this.signatureAlgorithm = SubtleUtil.toEcdsaAlgo(hash); |
| this.encoding = encoding; |
| } |
| |
| @Override |
| public byte[] sign(final byte[] data) throws GeneralSecurityException { |
| Signature signer = EngineFactory.SIGNATURE.getInstance(signatureAlgorithm); |
| signer.initSign(privateKey); |
| signer.update(data); |
| byte[] signature = signer.sign(); |
| if (encoding == EcdsaEncoding.IEEE_P1363) { |
| EllipticCurve curve = privateKey.getParams().getCurve(); |
| signature = |
| EllipticCurves.ecdsaDer2Ieee(signature, 2 * EllipticCurves.fieldSizeInBytes(curve)); |
| } |
| return signature; |
| } |
| } |