void read_data_block(char *data, const Uint count, const Uint block_idx)
{
static const std::string block_prefix("__CFDATA_BEGIN");
XmlNode block_node = get_block_node(block_idx);
const Uint block_begin = from_str<Uint>(block_node.attribute_value("begin"));
const Uint block_end = from_str<Uint>(block_node.attribute_value("end"));
const Uint compressed_size = block_end - block_begin - block_prefix.size();
// Check the prefix
binary_file.seekg(block_begin);
std::vector<char> prefix_buf(block_prefix.size());
binary_file.read(&prefix_buf[0], block_prefix.size());
const std::string read_prefix(prefix_buf.begin(), prefix_buf.end());
if(read_prefix != block_prefix)
throw SetupError(FromHere(), "Bad block prefix for block " + to_str(block_idx));
if(count != 0)
{
// Build a decompressing stream
boost::iostreams::filtering_istream decompressing_stream;
decompressing_stream.set_auto_close(false);
decompressing_stream.push(boost::iostreams::zlib_decompressor());
decompressing_stream.push(boost::iostreams::restrict(binary_file, 0, compressed_size));
// Read the data
decompressing_stream.read(data, count);
decompressing_stream.pop();
}
cf3_assert(binary_file.tellg() == block_end);
}
static int format_data(sc_card_t *card, const struct iso_sm_ctx *ctx,
const u8 *data, size_t datalen,
struct sc_asn1_entry *formatted_encrypted_data_entry,
u8 **formatted_data, size_t *formatted_data_len)
{
int r;
u8 *pad_data = NULL;
size_t pad_data_len = 0;
if (!ctx || !formatted_data || !formatted_data_len) {
r = SC_ERROR_INVALID_ARGUMENTS;
goto err;
}
r = add_padding(ctx, data, datalen, &pad_data);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not add padding to data: %s",
sc_strerror(r));
goto err;
}
pad_data_len = r;
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "Data to encrypt", pad_data, pad_data_len);
r = ctx->encrypt(card, ctx, pad_data, pad_data_len, formatted_data);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not encrypt the data");
goto err;
}
bin_log(card->ctx, SC_LOG_DEBUG_NORMAL, "Cryptogram", *formatted_data, r);
r = prefix_buf(ctx->padding_indicator, *formatted_data, r, formatted_data);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Could not prepend padding indicator to formatted "
"data: %s", sc_strerror(r));
goto err;
}
*formatted_data_len = r;
sc_format_asn1_entry(formatted_encrypted_data_entry,
*formatted_data, formatted_data_len, SC_ASN1_PRESENT);
r = SC_SUCCESS;
err:
if (pad_data) {
sc_mem_clear(pad_data, pad_data_len);
free(pad_data);
}
return r;
}
