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/*************************************************
* PBE Retrieval Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/get_pbe.h>
#include <botan/oids.h>
#include <botan/scan_name.h>
#include <botan/parsing.h>
#include <botan/libstate.h>
#if defined(BOTAN_HAS_PBE_PKCS_V15)
#include <botan/pbes1.h>
#endif
#if defined(BOTAN_HAS_PBE_PKCS_V20)
#include <botan/pbes2.h>
#endif
namespace Botan {
/*************************************************
* Get an encryption PBE, set new parameters *
*************************************************/
PBE* get_pbe(const std::string& algo_spec)
{
SCAN_Name request(algo_spec);
const std::string pbe = request.algo_name();
SCAN_Name digest_name = request.arg(0);
const std::string cipher = request.arg_as_string(1);
std::vector<std::string> cipher_spec = split_on(cipher, '/');
if(cipher_spec.size() != 2)
throw Invalid_Argument("PBE: Invalid cipher spec " + cipher);
const std::string cipher_algo = global_state().deref_alias(cipher_spec[0]);
const std::string cipher_mode = cipher_spec[1];
if(cipher_mode != "CBC")
throw Invalid_Argument("PBE: Invalid cipher mode " + cipher);
Algorithm_Factory& af = global_state().algorithm_factory();
const BlockCipher* block_cipher = af.make_block_cipher(cipher_algo);
if(!block_cipher)
throw Algorithm_Not_Found(cipher_algo);
const HashFunction* hash_function = af.make_hash_function(digest_name);
if(!hash_function)
throw Algorithm_Not_Found(digest_name.as_string());
if(request.arg_count() != 2)
throw Invalid_Algorithm_Name(algo_spec);
#if defined(BOTAN_HAS_PBE_PKCS_V15)
if(pbe == "PBE-PKCS5v15")
return new PBE_PKCS5v15(block_cipher->clone(),
hash_function->clone(),
ENCRYPTION);
#endif
#if defined(BOTAN_HAS_PBE_PKCS_V20)
if(pbe == "PBE-PKCS5v20")
return new PBE_PKCS5v20(block_cipher->clone(),
hash_function->clone());
#endif
throw Algorithm_Not_Found(algo_spec);
}
/*************************************************
* Get a decryption PBE, decode parameters *
*************************************************/
PBE* get_pbe(const OID& pbe_oid, DataSource& params)
{
SCAN_Name request(OIDS::lookup(pbe_oid));
const std::string pbe = request.algo_name();
#if defined(BOTAN_HAS_PBE_PKCS_V15)
if(pbe == "PBE-PKCS5v15")
{
if(request.arg_count() != 2)
throw Invalid_Algorithm_Name(request.as_string());
SCAN_Name digest_name = request.arg(0);
const std::string cipher = request.arg_as_string(1);
std::vector<std::string> cipher_spec = split_on(cipher, '/');
if(cipher_spec.size() != 2)
throw Invalid_Argument("PBE: Invalid cipher spec " + cipher);
const std::string cipher_algo = global_state().deref_alias(cipher_spec[0]);
const std::string cipher_mode = cipher_spec[1];
if(cipher_mode != "CBC")
throw Invalid_Argument("PBE: Invalid cipher mode " + cipher);
Algorithm_Factory& af = global_state().algorithm_factory();
const BlockCipher* block_cipher = af.make_block_cipher(cipher_algo);
if(!block_cipher)
throw Algorithm_Not_Found(cipher_algo);
const HashFunction* hash_function = af.make_hash_function(digest_name);
if(!hash_function)
throw Algorithm_Not_Found(digest_name.as_string());
PBE* pbe = new PBE_PKCS5v15(block_cipher->clone(),
hash_function->clone(),
DECRYPTION);
pbe->decode_params(params);
return pbe;
}
#endif
#if defined(BOTAN_HAS_PBE_PKCS_V20)
if(pbe == "PBE-PKCS5v20")
return new PBE_PKCS5v20(params);
#endif
throw Algorithm_Not_Found(pbe_oid.as_string());
}
}
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