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/*************************************************
* CMS Decoding Source File *
* (C) 1999-2003 The Botan Project *
*************************************************/
#include <botan/cms_dec.h>
#include <botan/ber_dec.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(BER::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)
{
BER_Decoder decoder(in);
BER_Decoder content_info = BER::get_subsequence(decoder);
BER::decode(content_info, 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.ptr(), 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 = BER::get_subsequence(decoder);
BER::decode(econtent_info, next_type);
BER_Decoder econtent = BER::get_subsequence(econtent_info, ASN1_Tag(0));
BER::decode(econtent, data, OCTET_STRING);
}
}
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