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package sun.security.tools.jarsigner;
import java.io.IOException;
import java.net.URI;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import com.sun.jarsigner.*;
import sun.security.pkcs.PKCS7;
import sun.security.util.*;
import sun.security.x509.*;
This class implements a content signing service.
It generates a timestamped signature for a given content according to
RFC 3161.
The signature along with a trusted timestamp and the signer's certificate
are all packaged into a standard PKCS #7 Signed Data message.
Author: Vincent Ryan
/**
* This class implements a content signing service.
* It generates a timestamped signature for a given content according to
* <a href="http://www.ietf.org/rfc/rfc3161.txt">RFC 3161</a>.
* The signature along with a trusted timestamp and the signer's certificate
* are all packaged into a standard PKCS #7 Signed Data message.
*
* @author Vincent Ryan
*/
@SuppressWarnings("deprecation")
public final class TimestampedSigner extends ContentSigner {
/*
* Object identifier for the subject information access X.509 certificate
* extension.
*/
private static final String SUBJECT_INFO_ACCESS_OID = "1.3.6.1.5.5.7.1.11";
/*
* Object identifier for the timestamping access descriptors.
*/
private static final ObjectIdentifier AD_TIMESTAMPING_Id;
static {
ObjectIdentifier tmp = null;
try {
tmp = new ObjectIdentifier("1.3.6.1.5.5.7.48.3");
} catch (IOException e) {
// ignore
}
AD_TIMESTAMPING_Id = tmp;
}
Instantiates a content signer that supports timestamped signatures.
/**
* Instantiates a content signer that supports timestamped signatures.
*/
public TimestampedSigner() {
}
Generates a PKCS #7 signed data message that includes a signature
timestamp.
This method is used when a signature has already been generated.
The signature, a signature timestamp, the signer's certificate chain,
and optionally the content that was signed, are packaged into a PKCS #7
signed data message.
Params: - params – The non-null input parameters.
- omitContent – true if the content should be omitted from the
signed data message. Otherwise the content is included.
- applyTimestamp – true if the signature should be timestamped.
Otherwise timestamping is not performed.
Throws: - NoSuchAlgorithmException – The exception is thrown if the signature
algorithm is unrecognised.
- CertificateException – The exception is thrown if an error occurs
while processing the signer's certificate or the TSA's
certificate.
- IOException – The exception is thrown if an error occurs while
generating the signature timestamp or while generating the signed
data message.
- NullPointerException – The exception is thrown if parameters is
null.
Returns: A PKCS #7 signed data message including a signature timestamp.
/**
* Generates a PKCS #7 signed data message that includes a signature
* timestamp.
* This method is used when a signature has already been generated.
* The signature, a signature timestamp, the signer's certificate chain,
* and optionally the content that was signed, are packaged into a PKCS #7
* signed data message.
*
* @param params The non-null input parameters.
* @param omitContent true if the content should be omitted from the
* signed data message. Otherwise the content is included.
* @param applyTimestamp true if the signature should be timestamped.
* Otherwise timestamping is not performed.
* @return A PKCS #7 signed data message including a signature timestamp.
* @throws NoSuchAlgorithmException The exception is thrown if the signature
* algorithm is unrecognised.
* @throws CertificateException The exception is thrown if an error occurs
* while processing the signer's certificate or the TSA's
* certificate.
* @throws IOException The exception is thrown if an error occurs while
* generating the signature timestamp or while generating the signed
* data message.
* @throws NullPointerException The exception is thrown if parameters is
* null.
*/
public byte[] generateSignedData(ContentSignerParameters params,
boolean omitContent, boolean applyTimestamp)
throws NoSuchAlgorithmException, CertificateException, IOException {
if (params == null) {
throw new NullPointerException();
}
// Parse the signature algorithm to extract the digest
// algorithm. The expected format is:
// "<digest>with<encryption>"
// or "<digest>with<encryption>and<mgf>"
String signatureAlgorithm = params.getSignatureAlgorithm();
X509Certificate[] signerChain = params.getSignerCertificateChain();
byte[] signature = params.getSignature();
// Include or exclude content
byte[] content = (omitContent == true) ? null : params.getContent();
URI tsaURI = null;
if (applyTimestamp) {
tsaURI = params.getTimestampingAuthority();
if (tsaURI == null) {
// Examine TSA cert
tsaURI = getTimestampingURI(
params.getTimestampingAuthorityCertificate());
if (tsaURI == null) {
throw new CertificateException(
"Subject Information Access extension not found");
}
}
}
return PKCS7.generateSignedData(signature, signerChain, content,
params.getSignatureAlgorithm(), tsaURI,
params.getTSAPolicyID(),
params.getTSADigestAlg());
}
Examine the certificate for a Subject Information Access extension
(RFC 5280). The extension's accessMethod field should contain the object identifier defined for timestamping: 1.3.6.1.5.5.7.48.3 and its accessLocation field should contain an HTTP or HTTPS URL. Params: - tsaCertificate – An X.509 certificate for the TSA.
Returns: An HTTP or HTTPS URI or null if none was found.
/**
* Examine the certificate for a Subject Information Access extension
* (<a href="http://tools.ietf.org/html/rfc5280">RFC 5280</a>).
* The extension's {@code accessMethod} field should contain the object
* identifier defined for timestamping: 1.3.6.1.5.5.7.48.3 and its
* {@code accessLocation} field should contain an HTTP or HTTPS URL.
*
* @param tsaCertificate An X.509 certificate for the TSA.
* @return An HTTP or HTTPS URI or null if none was found.
*/
public static URI getTimestampingURI(X509Certificate tsaCertificate) {
if (tsaCertificate == null) {
return null;
}
// Parse the extensions
try {
byte[] extensionValue =
tsaCertificate.getExtensionValue(SUBJECT_INFO_ACCESS_OID);
if (extensionValue == null) {
return null;
}
DerInputStream der = new DerInputStream(extensionValue);
der = new DerInputStream(der.getOctetString());
DerValue[] derValue = der.getSequence(5);
AccessDescription description;
GeneralName location;
URIName uri;
for (int i = 0; i < derValue.length; i++) {
description = new AccessDescription(derValue[i]);
if (description.getAccessMethod()
.equals(AD_TIMESTAMPING_Id)) {
location = description.getAccessLocation();
if (location.getType() == GeneralNameInterface.NAME_URI) {
uri = (URIName) location.getName();
if (uri.getScheme().equalsIgnoreCase("http") ||
uri.getScheme().equalsIgnoreCase("https")) {
return uri.getURI();
}
}
}
}
} catch (IOException ioe) {
// ignore
}
return null;
}
}