1 files changed, 123 insertions, 0 deletions
diff --git a/src/cms/cms_dec.cpp b/src/cms/cms_dec.cpp
new file mode 100644
index 000000000..edd1cd489
--- /dev/null
+++ b/src/cms/cms_dec.cpp
@@ -0,0 +1,123 @@
+/*************************************************
+* CMS Decoding Source File                       *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/cms_dec.h>
+#include <botan/ber_dec.h>
+#include <botan/asn1_int.h>
+#include <botan/oids.h>
+#include <botan/pem.h>
+
+namespace Botan {
+
+/*************************************************
+* CMS_Decoder Constructor                        *
+*************************************************/
+CMS_Decoder::CMS_Decoder(DataSource& in, const X509_Store& x509store,
+                         User_Interface& ui_ref, PKCS8_PrivateKey* key) :
+   ui(ui_ref), store(x509store)
+   {
+   status = GOOD;
+
+   add_key(key);
+
+   if(ASN1::maybe_BER(in) && !PEM_Code::matches(in))
+      initial_read(in);
+   else
+      {
+      DataSource_Memory ber(PEM_Code::decode_check_label(in, "PKCS7"));
+      initial_read(ber);
+      }
+   }
+
+/*************************************************
+* Read the outermost ContentInfo                 *
+*************************************************/
+void CMS_Decoder::initial_read(DataSource& in)
+   {
+   // FIXME...
+
+   /*
+   BER_Decoder decoder(in);
+   BER_Decoder content_info = decoder.start_cons(SEQUENCE);
+
+   content_info.decode(next_type);
+
+
+   BER_Decoder content_type = BER::get_subsequence(content_info, ASN1_Tag(0));
+   data = content_type.get_remaining();
+   */
+
+   decode_layer();
+   }
+
+/*************************************************
+* Add another private key to use                 *
+*************************************************/
+void CMS_Decoder::add_key(PKCS8_PrivateKey* key)
+   {
+   if(!key)
+      return;
+
+   for(u32bit j = 0; j != keys.size(); j++)
+      if(keys[j]->key_id() == key->key_id())
+         return;
+
+   keys.push_back(key);
+   }
+
+/*************************************************
+* Return the status information                  *
+*************************************************/
+CMS_Decoder::Status CMS_Decoder::layer_status() const
+   {
+   return status;
+   }
+
+/*************************************************
+* Return the final data content                  *
+*************************************************/
+std::string CMS_Decoder::get_data() const
+   {
+   if(layer_type() != DATA)
+      throw Invalid_State("CMS: Cannot retrieve data from non-DATA layer");
+   return std::string((const char*)data.begin(), data.size());
+   }
+
+/*************************************************
+* Return the content type of this layer          *
+*************************************************/
+CMS_Decoder::Content_Type CMS_Decoder::layer_type() const
+   {
+   if(type == OIDS::lookup("CMS.DataContent"))       return DATA;
+   if(type == OIDS::lookup("CMS.EnvelopedData"))     return ENVELOPED;
+   if(type == OIDS::lookup("CMS.CompressedData"))    return COMPRESSED;
+   if(type == OIDS::lookup("CMS.SignedData"))        return SIGNED;
+   if(type == OIDS::lookup("CMS.AuthenticatedData")) return AUTHENTICATED;
+   if(type == OIDS::lookup("CMS.DigestedData"))      return DIGESTED;
+   return UNKNOWN;
+   }
+
+/*************************************************
+* Return some information about this layer       *
+*************************************************/
+std::string CMS_Decoder::layer_info() const
+   {
+   return info;
+   }
+
+/*************************************************
+* Return some information about this layer       *
+*************************************************/
+void CMS_Decoder::read_econtent(BER_Decoder& decoder)
+   {
+   BER_Decoder econtent_info = decoder.start_cons(SEQUENCE);
+   econtent_info.decode(next_type);
+
+   // FIXME
+   //BER_Decoder econtent = BER::get_subsequence(econtent_info, ASN1_Tag(0));
+   //econtent.decode(data, OCTET_STRING);
+   }
+
+}