Added support for PKCS7 signed content in CMS. Port from Java BC. #310 #232

1 files changed, 48 insertions, 0 deletions

diff --git a/crypto/src/cms/Pkcs7ProcessableObject.cs b/crypto/src/cms/Pkcs7ProcessableObject.cs
new file mode 100644
index 000000000..1042b6ff5
--- /dev/null
+++ b/crypto/src/cms/Pkcs7ProcessableObject.cs
@@ -0,0 +1,48 @@
+using System.IO;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Cms;
+
+namespace Org.BouncyCastle.cms
+{
+  public class Pkcs7ProcessableObject : CmsProcessable
+  {
+    public DerObjectIdentifier ContentType { get; }
+    public Asn1Encodable Content { get; }
+
+    public Pkcs7ProcessableObject(DerObjectIdentifier contentType, Asn1Encodable content)
+    {
+      ContentType = contentType;
+      Content = content;
+    }
+
+    public void Write(Stream outStream)
+    {
+      using (var sw = new BinaryWriter(outStream))
+      {
+        if (Content is Asn1Sequence)
+        {
+          Asn1Sequence seq = Asn1Sequence.GetInstance(Content);
+
+          foreach (Asn1Encodable enc in seq)
+          {
+            sw.Write(enc.ToAsn1Object().GetEncoded(Asn1Encodable.Der));
+          }
+        }
+        else
+        {
+          byte[] encoded = Content.ToAsn1Object().GetEncoded(Asn1Encodable.Der);
+          int index = 1;
+          while ((encoded[index] & 0xff) > 127)
+          {
+            index++;
+          }
+
+          index++;
+          sw.Write(encoded, index, encoded.Length - index);
+        }
+      }
+    }
+
+    public object GetContent() => Content;
+  }
+}
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