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/* This file is in the public domain */
#include <vector>
#include <string>
#include <botan/lookup.h>
#include <botan/filters.h>
#ifdef BOTAN_EXT_COMPRESSOR_BZIP2
#include <botan/bzip2.h>
#endif
#ifdef BOTAN_EXT_COMPRESSOR_GZIP
#include <botan/gzip.h>
#endif
#ifdef BOTAN_EXT_COMPRESSOR_ZLIB
#include <botan/zlib.h>
#endif
using namespace Botan;
Filter* lookup_block(const std::string&, const std::string&);
Filter* lookup_cipher(const std::string&, const std::string&,
const std::string&, bool);
Filter* lookup_hash(const std::string&);
Filter* lookup_mac(const std::string&, const std::string&);
Filter* lookup_rng(const std::string&);
Filter* lookup_encoder(const std::string&);
Filter* lookup_s2k(const std::string&, const std::vector<std::string>&);
Filter* lookup_kdf(const std::string&, const std::string&,
const std::string&);
Filter* lookup(const std::string& algname,
const std::vector<std::string>& params,
const std::string& section)
{
std::string key = params[0];
std::string iv = params[1];
Filter* filter = 0;
// The order of the lookup has to change based on how the names are
// formatted and parsed.
filter = lookup_kdf(algname, key, iv);
if(filter) return filter;
if(section == "Cipher Modes (Decryption)")
filter = lookup_cipher(algname, key, iv, false);
else
filter = lookup_cipher(algname, key, iv, true);
if(filter) return filter;
filter = lookup_block(algname, key);
if(filter) return filter;
filter = lookup_rng(algname);
if(filter) return filter;
filter = lookup_encoder(algname);
if(filter) return filter;
filter = lookup_hash(algname);
if(filter) return filter;
filter = lookup_mac(algname, key);
if(filter) return filter;
filter = lookup_s2k(algname, params);
if(filter) return filter;
return 0;
}
Filter* lookup_hash(const std::string& algname)
{
Filter* hash = 0;
try {
hash = new Hash_Filter(algname);
}
catch(Algorithm_Not_Found) {}
return hash;
}
Filter* lookup_mac(const std::string& algname, const std::string& key)
{
Filter* mac = 0;
try {
mac = new MAC_Filter(algname, key);
}
catch(Algorithm_Not_Found) {}
return mac;
}
Filter* lookup_cipher(const std::string& algname, const std::string& key,
const std::string& iv, bool encrypt)
{
try {
if(encrypt)
return get_cipher(algname, key, iv, ENCRYPTION);
else
return get_cipher(algname, key, iv, DECRYPTION);
}
catch(Algorithm_Not_Found) {}
catch(Invalid_Algorithm_Name) {}
return 0;
}
Filter* lookup_encoder(const std::string& algname)
{
if(algname == "Base64_Encode")
return new Base64_Encoder;
if(algname == "Base64_Decode")
return new Base64_Decoder;
#ifdef BOTAN_EXT_COMPRESSOR_BZIP2
if(algname == "Bzip_Compression")
return new Bzip_Compression(9);
if(algname == "Bzip_Decompression")
return new Bzip_Decompression;
#endif
#ifdef BOTAN_EXT_COMPRESSOR_GZIP
if(algname == "Gzip_Compression")
return new Gzip_Compression(9);
if(algname == "Gzip_Decompression")
return new Gzip_Decompression;
#endif
#ifdef BOTAN_EXT_COMPRESSOR_ZLIB
if(algname == "Zlib_Compression")
return new Zlib_Compression(9);
if(algname == "Zlib_Decompression")
return new Zlib_Decompression;
#endif
return 0;
}
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