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Tink is a small cryptographic library that provides a safe, simple, agile and fast way to accomplish some common cryptographic tasks.

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// Copyright 2020 Google LLC
//
// 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.protobuf.ByteString;
import java.security.GeneralSecurityException;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.interfaces.RSAPrivateCrtKey;
import java.security.interfaces.RSAPublicKey;

/** Self Key tests validation helper methods. */
public final class SelfKeyTestValidators {
  private SelfKeyTestValidators() {}

  private static final ByteString TEST_MESSAGE = ByteString.copyFromUtf8("Tink and Wycheproof.");

  public static final void validateRsaSsaPss(
      RSAPrivateCrtKey privateKey,
      RSAPublicKey publicKey,
      Enums.HashType sigHash,
      Enums.HashType mgf1Hash,
      int saltLength)
      throws GeneralSecurityException {

    RsaSsaPssSignJce rsaSigner = new RsaSsaPssSignJce(privateKey, sigHash, mgf1Hash, saltLength);
    RsaSsaPssVerifyJce rsaVerifier =
        new RsaSsaPssVerifyJce(publicKey, sigHash, mgf1Hash, saltLength);
    try {
      rsaVerifier.verify(rsaSigner.sign(TEST_MESSAGE.toByteArray()), TEST_MESSAGE.toByteArray());
    } catch (GeneralSecurityException e) {
      throw new GeneralSecurityException(
          "RSA PSS signing with private key followed by verifying with public key failed."
              + " The key may be corrupted.",
          e);
    }
  }

  public static final void validateRsaSsaPkcs1(
      RSAPrivateCrtKey privateKey, RSAPublicKey publicKey, Enums.HashType sigHash)
      throws GeneralSecurityException {

    RsaSsaPkcs1SignJce rsaSigner = new RsaSsaPkcs1SignJce(privateKey, sigHash);
    RsaSsaPkcs1VerifyJce rsaVerifier = new RsaSsaPkcs1VerifyJce(publicKey, sigHash);
    try {
      rsaVerifier.verify(rsaSigner.sign(TEST_MESSAGE.toByteArray()), TEST_MESSAGE.toByteArray());
    } catch (GeneralSecurityException e) {
      throw new GeneralSecurityException(
          "RSA PKCS1 signing with private key followed by verifying with public key failed."
              + " The key may be corrupted.",
          e);
    }
  }

  public static final void validateEcdsa(
      ECPrivateKey privateKey,
      ECPublicKey publicKey,
      Enums.HashType hash,
      EllipticCurves.EcdsaEncoding encoding)
      throws GeneralSecurityException {

    EcdsaSignJce ecdsaSigner = new EcdsaSignJce(privateKey, hash, encoding);
    EcdsaVerifyJce ecdsaverifier = new EcdsaVerifyJce(publicKey, hash, encoding);
    try {
      ecdsaverifier.verify(
          ecdsaSigner.sign(TEST_MESSAGE.toByteArray()), TEST_MESSAGE.toByteArray());
    } catch (GeneralSecurityException e) {
      throw new GeneralSecurityException(
          "ECDSA signing with private key followed by verifying with public key failed."
              + " The key may be corrupted.",
          e);
    }
  }
}