+ added PKCS7 detached siganture standard via keystore

+ added simple verification implementation

3 files changed, 170 insertions, 0 deletions

diff --git a/signature-standards/sigs-pcks7detached/src/main/java/at/gv/egiz/pdfas/sigs/pkcs7detached/PKCS7DetachedSigner.java b/signature-standards/sigs-pcks7detached/src/main/java/at/gv/egiz/pdfas/sigs/pkcs7detached/PKCS7DetachedSigner.java
new file mode 100644
index 00000000..864a31d1
--- /dev/null
+++ b/signature-standards/sigs-pcks7detached/src/main/java/at/gv/egiz/pdfas/sigs/pkcs7detached/PKCS7DetachedSigner.java
@@ -0,0 +1,88 @@
+package at.gv.egiz.pdfas.sigs.pkcs7detached;
+
+import iaik.asn1.structures.AlgorithmID;
+import iaik.cms.SignedDataStream;
+import iaik.cms.SignerInfo;
+import iaik.cms.SubjectKeyID;
+import iaik.security.ecc.provider.ECCProvider;
+import iaik.security.provider.IAIK;
+import iaik.x509.X509Certificate;
+import iaik.x509.X509ExtensionException;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.KeyStore;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.cert.Certificate;
+
+import org.apache.pdfbox.cos.COSName;
+import org.apache.pdfbox.exceptions.SignatureException;
+import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature;
+
+import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
+import at.gv.egiz.pdfas.lib.api.sign.IPlainSigner;
+
+public class PKCS7DetachedSigner implements IPlainSigner {
+
+	PrivateKey privKey;
+	X509Certificate cert;
+
+	public PKCS7DetachedSigner(String file, String alias, String kspassword,
+			String keypassword, String type) throws PdfAsException {
+		try {
+			IAIK.getInstance();
+			ECCProvider.addAsProvider();
+			KeyStore ks = KeyStore.getInstance(type);
+			ks.load(new FileInputStream(file), kspassword.toCharArray());
+			privKey = (PrivateKey) ks.getKey(alias, keypassword.toCharArray());
+			cert = new X509Certificate(ks.getCertificate(alias).getEncoded());
+		} catch (Throwable e) {
+			throw new PdfAsException("Failed to get KeyStore", e);
+		}
+	}
+
+	public X509Certificate getCertificate() {
+		return cert;
+	}
+
+	public byte[] sign(byte[] input) throws SignatureException, IOException {
+		try {
+			SignedDataStream signed_data_stream = new SignedDataStream(
+					new ByteArrayInputStream(input), SignedDataStream.EXPLICIT);
+			ByteArrayOutputStream baos = new ByteArrayOutputStream();
+			signed_data_stream.addCertificates(new Certificate[] { cert });
+
+			SubjectKeyID subjectKeyId = new SubjectKeyID(cert);
+			SignerInfo signer1 = new SignerInfo(subjectKeyId,
+					AlgorithmID.sha256, privKey);
+			signed_data_stream.addSignerInfo(signer1);
+			InputStream data_is = signed_data_stream.getInputStream();
+			if (signed_data_stream.getMode() == SignedDataStream.EXPLICIT) {
+				byte[] buf = new byte[1024];
+				int r;
+				while ((r = data_is.read(buf)) > 0) {
+					// do something useful
+				}
+			}
+			signed_data_stream.writeTo(baos);
+			return baos.toByteArray();
+		} catch (NoSuchAlgorithmException e) {
+			throw new SignatureException(e);
+		} catch (X509ExtensionException e) {
+			throw new SignatureException(e);
+		}
+	}
+
+	public String getPDFSubFilter() {
+		return PDSignature.SUBFILTER_ADBE_PKCS7_DETACHED.getName();
+	}
+	
+	public String getPDFFilter() {
+		return PDSignature.FILTER_ADOBE_PPKLITE.getName();
+	}
+
+}
diff --git a/signature-standards/sigs-pcks7detached/src/main/java/at/gv/egiz/pdfas/sigs/pkcs7detached/PKCS7DetachedVerifier.java b/signature-standards/sigs-pcks7detached/src/main/java/at/gv/egiz/pdfas/sigs/pkcs7detached/PKCS7DetachedVerifier.java
new file mode 100644
index 00000000..7807850b
--- /dev/null
+++ b/signature-standards/sigs-pcks7detached/src/main/java/at/gv/egiz/pdfas/sigs/pkcs7detached/PKCS7DetachedVerifier.java
@@ -0,0 +1,74 @@
+package at.gv.egiz.pdfas.sigs.pkcs7detached;
+
+import iaik.cms.SignedData;
+import iaik.cms.SignerInfo;
+import iaik.x509.X509Certificate;
+
+import java.io.ByteArrayInputStream;
+import java.security.SignatureException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
+import at.gv.egiz.pdfas.lib.api.verify.VerifyResult;
+import at.gv.egiz.pdfas.lib.impl.verify.FilterEntry;
+import at.gv.egiz.pdfas.lib.impl.verify.IVerifyFilter;
+import at.gv.egiz.pdfas.lib.impl.verify.VerifyResultImpl;
+
+public class PKCS7DetachedVerifier implements IVerifyFilter {
+
+	private static final Logger logger = LoggerFactory.getLogger(PKCS7DetachedVerifier.class);
+	
+	public List<VerifyResult> verify(byte[] contentData, byte[] signatureContent)
+			throws PdfAsException {
+		try {
+			List<VerifyResult> result = new ArrayList<VerifyResult>();
+			SignedData signedData = new SignedData(new ByteArrayInputStream(
+					signatureContent));
+			signedData.setContent(contentData);
+
+			// get the signer infos
+			SignerInfo[] signerInfos = signedData.getSignerInfos();
+			// verify the signatures
+			for (int i = 0; i < signerInfos.length; i++) {
+				VerifyResultImpl verifyResult = new VerifyResultImpl();
+				try {
+					
+					// verify the signature for SignerInfo at index i
+					X509Certificate signer_cert = signedData.verify(i);
+					// if the signature is OK the certificate of the
+					// signer is returned
+					logger.info("Signature OK from signer: "
+							+ signer_cert.getSubjectDN());
+					verifyResult.setSignerCertificate(signer_cert);
+				} catch (SignatureException ex) {
+					// if the signature is not OK a SignatureException
+					// is thrown
+					logger.info("Signature ERROR from signer: "
+							+ signedData.getCertificate(
+									signerInfos[i].getSignerIdentifier())
+									.getSubjectDN());
+					
+					verifyResult.setSignerCertificate(
+							signedData.getCertificate(signerInfos[i].getSignerIdentifier()));
+				}
+				result.add(verifyResult);
+			}
+
+			return result;
+		} catch (Throwable e) {
+			throw new PdfAsException("Verify failed", e);
+		}
+	}
+
+	public List<FilterEntry> getFiters() {
+		List<FilterEntry> result = new ArrayList<FilterEntry>();
+		result.add(new FilterEntry(PDSignature.FILTER_ADOBE_PPKLITE, PDSignature.SUBFILTER_ADBE_PKCS7_DETACHED));
+		return result;
+	}
+
+}
diff --git a/signature-standards/sigs-pcks7detached/src/main/java/at/gv/egiz/pdfas/sigs/pkcs7detached/package-info.java b/signature-standards/sigs-pcks7detached/src/main/java/at/gv/egiz/pdfas/sigs/pkcs7detached/package-info.java
new file mode 100644
index 00000000..69a99830
--- /dev/null
+++ b/signature-standards/sigs-pcks7detached/src/main/java/at/gv/egiz/pdfas/sigs/pkcs7detached/package-info.java
@@ -0,0 +1,8 @@
+/**
+ * 
+ */
+/**
+ * @author afitzek
+ *
+ */
+package at.gv.egiz.pdfas.sigs.pkcs7detached;
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