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/*
* Copyright 2014 The bitcoinj authors.
*
* 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 org.bitcoinj.crypto;
import com.google.common.base.Joiner;
import org.bitcoinj.protocols.payments.PaymentSession;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1String;
import org.bouncycastle.asn1.x500.AttributeTypeAndValue;
import org.bouncycastle.asn1.x500.RDN;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x500.style.RFC4519Style;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.Collection;
import java.util.List;
/**
* X509Utils provides tools for working with X.509 certificates and keystores, as used in the BIP 70 payment protocol.
* For more details on this, see {@link PaymentSession}, the article "Working with
* the payment protocol" on the bitcoinj website, or the Bitcoin developer guide.
*/
public class X509Utils {
/**
* Returns either a string that "sums up" the certificate for humans, in a similar manner to what you might see
* in a web browser, or null if one cannot be extracted. This will typically be the common name (CN) field, but
* can also be the org (O) field, org+location+country if withLocation is set, or the email
* address for S/MIME certificates.
*/
@Nullable
public static String getDisplayNameFromCertificate(@Nonnull X509Certificate certificate, boolean withLocation) throws CertificateParsingException {
X500Name name = new X500Name(certificate.getSubjectX500Principal().getName());
String commonName = null, org = null, location = null, country = null;
for (RDN rdn : name.getRDNs()) {
AttributeTypeAndValue pair = rdn.getFirst();
String val = ((ASN1String) pair.getValue()).getString();
ASN1ObjectIdentifier type = pair.getType();
if (type.equals(RFC4519Style.cn))
commonName = val;
else if (type.equals(RFC4519Style.o))
org = val;
else if (type.equals(RFC4519Style.l))
location = val;
else if (type.equals(RFC4519Style.c))
country = val;
}
final Collection> subjectAlternativeNames = certificate.getSubjectAlternativeNames();
String altName = null;
if (subjectAlternativeNames != null)
for (final List subjectAlternativeName : subjectAlternativeNames)
if ((Integer) subjectAlternativeName.get(0) == 1) // rfc822name
altName = (String) subjectAlternativeName.get(1);
if (org != null) {
return withLocation ? Joiner.on(", ").skipNulls().join(org, location, country) : org;
} else if (commonName != null) {
return commonName;
} else {
return altName;
}
}
/** Returns a key store loaded from the given stream. Just a convenience around the Java APIs. */
public static KeyStore loadKeyStore(String keystoreType, @Nullable String keystorePassword, InputStream is)
throws KeyStoreException {
try {
KeyStore keystore = KeyStore.getInstance(keystoreType);
keystore.load(is, keystorePassword != null ? keystorePassword.toCharArray() : null);
return keystore;
} catch (IOException x) {
throw new KeyStoreException(x);
} catch (GeneralSecurityException x) {
throw new KeyStoreException(x);
} finally {
try {
is.close();
} catch (IOException x) {
// Ignored.
}
}
}
}