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/*
* Copyright 2021 Nokia
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.onap.cvc.csar.security;
import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.openssl.PEMParser;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
public class SignatureFactory {
public static final String PEM_SIGNATURE_BEGIN_TAG = "-----BEGIN CMS-----";
public static final String PEM_SIGNATURE_END_TAG = "-----END CMS-----";
public ContentInfo createSignature(byte[] signatureStream) throws IOException, CmsSignatureLoadingException {
byte[] pemSignatureStream = convertSignatureToPemIfInDerFormat(signatureStream);
try(ByteArrayInputStream signatureInput = new ByteArrayInputStream(pemSignatureStream)) {
Object parsedObject = new PEMParser(new InputStreamReader(signatureInput)).readPemObject().getContent();
return ContentInfo.getInstance(parsedObject);
} catch (Exception e) {
throw new CmsSignatureLoadingException("Signature is not recognized!", e);
}
}
private byte[] convertSignatureToPemIfInDerFormat(byte[] signatureStream) throws IOException {
byte[] encodedSignatureStream = signatureStream.clone();
if (!Base64.isBase64(signatureStream)) {
encodedSignatureStream = Base64.encodeBase64(encodedSignatureStream);
encodedSignatureStream = wrapWithPemTags(encodedSignatureStream);
}
return encodedSignatureStream;
}
private byte[] wrapWithPemTags(byte[] encodedSignatureStream) throws IOException {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream( );
outputStream.write( (PEM_SIGNATURE_BEGIN_TAG + "\n").getBytes() );
outputStream.write( encodedSignatureStream );
outputStream.write( ("\n" + PEM_SIGNATURE_END_TAG).getBytes() );
return outputStream.toByteArray();
}
}
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