67 lines
2.5 KiB
Java
67 lines
2.5 KiB
Java
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net.vcn.persistablebundleutils;
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import java.io.ByteArrayInputStream;
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import java.io.InputStream;
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import java.security.KeyFactory;
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import java.security.NoSuchAlgorithmException;
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import java.security.cert.CertificateException;
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import java.security.cert.CertificateFactory;
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import java.security.cert.X509Certificate;
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import java.security.interfaces.RSAPrivateKey;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.util.Objects;
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/**
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* CertUtils provides utility methods for constructing Certificate and PrivateKey.
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*
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* @hide
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*/
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public class CertUtils {
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private static final String CERT_TYPE_X509 = "X.509";
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private static final String PRIVATE_KEY_TYPE_RSA = "RSA";
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/** Decodes an ASN.1 DER encoded Certificate */
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public static X509Certificate certificateFromByteArray(byte[] derEncoded) {
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Objects.requireNonNull(derEncoded, "derEncoded is null");
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try {
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CertificateFactory certFactory = CertificateFactory.getInstance(CERT_TYPE_X509);
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InputStream in = new ByteArrayInputStream(derEncoded);
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return (X509Certificate) certFactory.generateCertificate(in);
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} catch (CertificateException e) {
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throw new IllegalArgumentException("Fail to decode certificate", e);
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}
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}
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/** Decodes a PKCS#8 encoded RSA private key */
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public static RSAPrivateKey privateKeyFromByteArray(byte[] pkcs8Encoded) {
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Objects.requireNonNull(pkcs8Encoded, "pkcs8Encoded was null");
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PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(pkcs8Encoded);
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try {
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KeyFactory keyFactory = KeyFactory.getInstance(PRIVATE_KEY_TYPE_RSA);
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return (RSAPrivateKey) keyFactory.generatePrivate(privateKeySpec);
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} catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
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throw new IllegalArgumentException("Fail to decode PrivateKey", e);
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}
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}
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}
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