Add the (very old) CMS | S/MIME support code to misc/cms

1 files changed, 87 insertions, 0 deletions

diff --git a/misc/cms/cms_enc.cpp b/misc/cms/cms_enc.cpp
new file mode 100644
index 000000000..58b3eadf6
--- /dev/null
+++ b/misc/cms/cms_enc.cpp
@@ -0,0 +1,87 @@
+/*************************************************
+* CMS Encoding Base Source File                  *
+* (C) 1999-2003 The Botan Project                *
+*************************************************/
+
+#include <botan/cms_enc.h>
+#include <botan/der_enc.h>
+#include <botan/oids.h>
+#include <botan/pem.h>
+
+namespace Botan {
+
+/*************************************************
+* Setup the intitial layer of CMS data           *
+*************************************************/
+void CMS_Encoder::set_data(const byte buf[], u32bit length)
+   {
+   if(data.has_items())
+      throw Invalid_State("Cannot call CMS_Encoder::set_data here");
+
+   data.set(buf, length);
+   type = "CMS.DataContent";
+   }
+
+/*************************************************
+* Setup the intitial layer of CMS data           *
+*************************************************/
+void CMS_Encoder::set_data(const std::string& str)
+   {
+   set_data((const byte*)str.c_str(), str.length());
+   }
+
+/*************************************************
+* Finalize and return the CMS encoded data       *
+*************************************************/
+SecureVector<byte> CMS_Encoder::get_contents()
+   {
+   DER_Encoder encoder;
+
+   encoder.start_sequence();
+     DER::encode(encoder, OIDS::lookup(type));
+     encoder.start_explicit(ASN1_Tag(0));
+       encoder.add_raw_octets(data);
+     encoder.end_explicit(ASN1_Tag(0));
+   encoder.end_sequence();
+
+   data.clear();
+
+   return encoder.get_contents();
+   }
+
+/*************************************************
+* Add a new layer of encapsulation               *
+*************************************************/
+void CMS_Encoder::add_layer(const std::string& oid, DER_Encoder& new_layer)
+   {
+   data = new_layer.get_contents();
+   type = oid;
+   }
+
+/*************************************************
+* Return the PEM-encoded data                    *
+*************************************************/
+std::string CMS_Encoder::PEM_contents()
+   {
+   return PEM_Code::encode(get_contents(), "PKCS7");
+   }
+
+/*************************************************
+* Make an EncapsulatedContentInfo                *
+*************************************************/
+SecureVector<byte> CMS_Encoder::make_econtent(const SecureVector<byte>& data,
+                                              const std::string& type)
+   {
+   DER_Encoder encoder;
+
+   encoder.start_sequence();
+     DER::encode(encoder, OIDS::lookup(type));
+     encoder.start_explicit(ASN1_Tag(0));
+       DER::encode(encoder, data, OCTET_STRING);
+     encoder.end_explicit(ASN1_Tag(0));
+   encoder.end_sequence();
+
+   return encoder.get_contents();
+   }
+
+}