PKCS7 structures that have their content encapsulated in a sequence are not imported correctly

The case to handle content which has been encapsulated in a sequence
has been in place already but wasn't implemented. The fix is inspired
by Pull Request: jruby/jruby-ossl#9. The test
case includes PKCS7 samples to showcase the issue. Credit goes to Jason
Franklin [https://github.com/jamuc] for helping with the samples and
the fix in general.

Conflicts:
	test/externals/ruby1.9/openssl/test_pkcs7.rb

Author: Martin Ott

src/org/jruby/ext/openssl/impl/EncContent.java

@@ -27,15 +27,18 @@
  ***** END LICENSE BLOCK *****/
 package org.jruby.ext.openssl.impl;
 
+import java.util.Enumeration;
 import org.bouncycastle.asn1.ASN1Encodable;
 import org.bouncycastle.asn1.ASN1EncodableVector;
 import org.bouncycastle.asn1.ASN1OctetString;
 import org.bouncycastle.asn1.ASN1Sequence;
 import org.bouncycastle.asn1.DEREncodable;
 import org.bouncycastle.asn1.DERObjectIdentifier;
+import org.bouncycastle.asn1.DEROctetString;
 import org.bouncycastle.asn1.DERSequence;
 import org.bouncycastle.asn1.DERTaggedObject;
 import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
+import org.jruby.util.ByteList;
 
 /** PKCS7_ENC_CONTENT
  *
@@ -158,7 +161,14 @@ public static EncContent fromASN1(DEREncodable content) {
         ec.setAlgorithm(AlgorithmIdentifier.getInstance(sequence.getObjectAt(1)));
         if(sequence.size() > 2 && sequence.getObjectAt(2) instanceof DERTaggedObject && ((DERTaggedObject)(sequence.getObjectAt(2))).getTagNo() == 0) {
             DEREncodable ee = ((DERTaggedObject)(sequence.getObjectAt(2))).getObject();
-            if(ee instanceof ASN1Sequence) {
+            if(ee instanceof ASN1Sequence && ((ASN1Sequence)ee).size() > 0) {
+                ByteList combinedOctets = new ByteList();
+                Enumeration enm = ((ASN1Sequence)ee).getObjects();
+                while (enm.hasMoreElements()) {
+                    byte[] octets = ((ASN1OctetString)enm.nextElement()).getOctets();
+                    combinedOctets.append(octets);
+                }
+                ec.setEncData(new DEROctetString(combinedOctets.bytes()));
             } else {
                 ec.setEncData((ASN1OctetString)ee);
             }

test/externals/ruby1.9/openssl/test_pkcs7.rb

@@ -218,6 +218,80 @@ def test_degenerate_pkcs7
       p7.to_pem
     end
   end
+
+  def test_split_content
+     pki_message_pem = <<END
+-----BEGIN PKCS7-----
+MIIHSwYJKoZIhvcNAQcCoIIHPDCCBzgCAQExCzAJBgUrDgMCGgUAMIIDiAYJKoZI
+hvcNAQcBoIIDeQSCA3UwgAYJKoZIhvcNAQcDoIAwgAIBADGCARAwggEMAgEAMHUw
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+-----END PKCS7-----
+END
+    pki_message_content_pem = <<END
+-----BEGIN PKCS7-----
+MIIDawYJKoZIhvcNAQcDoIIDXDCCA1gCAQAxggEQMIIBDAIBADB1MHAxEDAOBgNV
+BAoMB2V4YW1wbGUxFzAVBgNVBAMMDlRBUk1BQyBST09UIENBMSIwIAYJKoZIhvcN
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+-----END PKCS7-----
+END
+    pki_msg = OpenSSL::PKCS7.new(pki_message_pem)
+    store = OpenSSL::X509::Store.new
+    pki_msg.verify(nil, store, nil, OpenSSL::PKCS7::NOVERIFY)
+    p7enc = OpenSSL::PKCS7.new(pki_msg.data)
+    assert_equal(p7enc.to_pem, pki_message_content_pem) 
+  end
 end
 
 end