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/*************************************************
* OpenSSL Hash Functions Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/eng_ossl.h>
#include <botan/parsing.h>
#include <botan/lookup.h>
#include <openssl/evp.h>
namespace Botan {
namespace {
/*************************************************
* EVP Hash Function *
*************************************************/
class EVP_HashFunction : public HashFunction
{
public:
void clear() throw();
std::string name() const { return algo_name; }
HashFunction* clone() const;
EVP_HashFunction(const EVP_MD*, const std::string&);
~EVP_HashFunction();
private:
void add_data(const byte[], u32bit);
void final_result(byte[]);
std::string algo_name;
EVP_MD_CTX md;
};
/*************************************************
* Update an EVP Hash Calculation *
*************************************************/
void EVP_HashFunction::add_data(const byte input[], u32bit length)
{
EVP_DigestUpdate(&md, input, length);
}
/*************************************************
* Finalize an EVP Hash Calculation *
*************************************************/
void EVP_HashFunction::final_result(byte output[])
{
EVP_DigestFinal_ex(&md, output, 0);
const EVP_MD* algo = EVP_MD_CTX_md(&md);
EVP_DigestInit_ex(&md, algo, 0);
}
/*************************************************
* Clear memory of sensitive data *
*************************************************/
void EVP_HashFunction::clear() throw()
{
const EVP_MD* algo = EVP_MD_CTX_md(&md);
EVP_DigestInit_ex(&md, algo, 0);
}
/*************************************************
* Return a clone of this object *
*************************************************/
HashFunction* EVP_HashFunction::clone() const
{
const EVP_MD* algo = EVP_MD_CTX_md(&md);
return new EVP_HashFunction(algo, name());
}
/*************************************************
* Create an EVP hash function *
*************************************************/
EVP_HashFunction::EVP_HashFunction(const EVP_MD* algo,
const std::string& name) :
HashFunction(EVP_MD_size(algo), EVP_MD_block_size(algo)),
algo_name(name)
{
EVP_MD_CTX_init(&md);
EVP_DigestInit_ex(&md, algo, 0);
}
/*************************************************
* Destroy an EVP hash function *
*************************************************/
EVP_HashFunction::~EVP_HashFunction()
{
EVP_MD_CTX_cleanup(&md);
}
}
/*************************************************
* Look for an algorithm with this name *
*************************************************/
HashFunction* OpenSSL_Engine::find_hash(const std::string& algo_spec) const
{
std::vector<std::string> name = parse_algorithm_name(algo_spec);
if(name.size() == 0)
return 0;
const std::string algo_name = deref_alias(name[0]);
#define HANDLE_EVP_MD(NAME, EVP) \
if(algo_name == NAME) \
{ \
if(name.size() == 1) \
return new EVP_HashFunction(EVP, NAME); \
throw Invalid_Algorithm_Name(algo_spec); \
}
HANDLE_EVP_MD("SHA-160", EVP_sha1());
HANDLE_EVP_MD("MD2", EVP_md2());
HANDLE_EVP_MD("MD4", EVP_md4());
HANDLE_EVP_MD("MD5", EVP_md5());
HANDLE_EVP_MD("RIPEMD-160", EVP_ripemd160());
#undef HANDLE_EVP_MD
return 0;
}
}
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