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iText, a free Java-PDF library
/*
* Copyright 2004 by Paulo Soares.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.pdf;
import java.io.ByteArrayOutputStream;
import java.security.PrivateKey;
import java.security.cert.CRL;
import java.security.cert.Certificate;
import com.lowagie.text.ExceptionConverter;
/**
* A signature dictionary representation for the standard filters.
*/
public abstract class PdfSigGenericPKCS extends PdfSignature {
/**
* The hash algorithm, for example "SHA1"
*/
protected String hashAlgorithm;
/**
* The crypto provider
*/
protected String provider = null;
/**
* The class instance that calculates the PKCS#1 and PKCS#7
*/
protected PdfPKCS7 pkcs;
/**
* The subject name in the signing certificate (the element "CN")
*/
protected String name;
private byte externalDigest[];
private byte externalRSAdata[];
private String digestEncryptionAlgorithm;
/**
* Creates a generic standard filter.
* @param filter the filter name
* @param subFilter the sub-filter name
*/
public PdfSigGenericPKCS(PdfName filter, PdfName subFilter) {
super(filter, subFilter);
}
/**
* Sets the crypto information to sign.
* @param privKey the private key
* @param certChain the certificate chain
* @param crlList the certificate revocation list. It can be null
*/
public void setSignInfo(PrivateKey privKey, Certificate[] certChain, CRL[] crlList) {
try {
pkcs = new PdfPKCS7(privKey, certChain, crlList, hashAlgorithm, provider, PdfName.ADBE_PKCS7_SHA1.equals(get(PdfName.SUBFILTER)));
pkcs.setExternalDigest(externalDigest, externalRSAdata, digestEncryptionAlgorithm);
if (PdfName.ADBE_X509_RSA_SHA1.equals(get(PdfName.SUBFILTER))) {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
for (int k = 0; k < certChain.length; ++k) {
bout.write(certChain[k].getEncoded());
}
bout.close();
setCert(bout.toByteArray());
setContents(pkcs.getEncodedPKCS1());
}
else
setContents(pkcs.getEncodedPKCS7());
name = PdfPKCS7.getSubjectFields(pkcs.getSigningCertificate()).getField("CN");
if (name != null)
put(PdfName.NAME, new PdfString(name, PdfObject.TEXT_UNICODE));
pkcs = new PdfPKCS7(privKey, certChain, crlList, hashAlgorithm, provider, PdfName.ADBE_PKCS7_SHA1.equals(get(PdfName.SUBFILTER)));
pkcs.setExternalDigest(externalDigest, externalRSAdata, digestEncryptionAlgorithm);
}
catch (Exception e) {
throw new ExceptionConverter(e);
}
}
/**
* Sets the digest/signature to an external calculated value.
* @param digest the digest. This is the actual signature
* @param RSAdata the extra data that goes into the data tag in PKCS#7
* @param digestEncryptionAlgorithm the encryption algorithm. It may must be null if the digest
* is also null. If the digest is not null
* then it may be "RSA" or "DSA"
*/
public void setExternalDigest(byte digest[], byte RSAdata[], String digestEncryptionAlgorithm) {
externalDigest = digest;
externalRSAdata = RSAdata;
this.digestEncryptionAlgorithm = digestEncryptionAlgorithm;
}
/**
* Gets the subject name in the signing certificate (the element "CN")
* @return the subject name in the signing certificate (the element "CN")
*/
public String getName() {
return name;
}
/**
* Gets the class instance that does the actual signing.
* @return the class instance that does the actual signing
*/
public PdfPKCS7 getSigner() {
return pkcs;
}
/**
* Gets the signature content. This can be a PKCS#1 or a PKCS#7. It corresponds to
* the /Contents key.
* @return the signature content
*/
public byte[] getSignerContents() {
if (PdfName.ADBE_X509_RSA_SHA1.equals(get(PdfName.SUBFILTER)))
return pkcs.getEncodedPKCS1();
else
return pkcs.getEncodedPKCS7();
}
/**
* Creates a standard filter of the type VeriSign.
*/
public static class VeriSign extends PdfSigGenericPKCS {
/**
* The constructor for the default provider.
*/
public VeriSign() {
super(PdfName.VERISIGN_PPKVS, PdfName.ADBE_PKCS7_DETACHED);
hashAlgorithm = "MD5";
put(PdfName.R, new PdfNumber(65537));
}
/**
* The constructor for an explicit provider.
* @param provider the crypto provider
*/
public VeriSign(String provider) {
this();
this.provider = provider;
}
}
/**
* Creates a standard filter of the type self signed.
*/
public static class PPKLite extends PdfSigGenericPKCS {
/**
* The constructor for the default provider.
*/
public PPKLite() {
super(PdfName.ADOBE_PPKLITE, PdfName.ADBE_X509_RSA_SHA1);
hashAlgorithm = "SHA1";
put(PdfName.R, new PdfNumber(65541));
}
/**
* The constructor for an explicit provider.
* @param provider the crypto provider
*/
public PPKLite(String provider) {
this();
this.provider = provider;
}
}
/**
* Creates a standard filter of the type Windows Certificate.
*/
public static class PPKMS extends PdfSigGenericPKCS {
/**
* The constructor for the default provider.
*/
public PPKMS() {
super(PdfName.ADOBE_PPKMS, PdfName.ADBE_PKCS7_SHA1);
hashAlgorithm = "SHA1";
}
/**
* The constructor for an explicit provider.
* @param provider the crypto provider
*/
public PPKMS(String provider) {
this();
this.provider = provider;
}
}
}