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/*
* OpenSSL Hash Functions
* (C) 1999-2007,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/hash.h>
#include <botan/internal/openssl.h>
#include <botan/internal/algo_registry.h>
#include <openssl/evp.h>
namespace Botan {
namespace {
class OpenSSL_HashFunction : public HashFunction
{
public:
void clear() override
{
const EVP_MD* algo = EVP_MD_CTX_md(&m_md);
EVP_DigestInit_ex(&m_md, algo, nullptr);
}
std::string name() const override { return m_name; }
HashFunction* clone() const override
{
const EVP_MD* algo = EVP_MD_CTX_md(&m_md);
return new OpenSSL_HashFunction(algo, name());
}
size_t output_length() const override
{
return EVP_MD_size(EVP_MD_CTX_md(&m_md));
}
size_t hash_block_size() const override
{
return EVP_MD_block_size(EVP_MD_CTX_md(&m_md));
}
OpenSSL_HashFunction(const EVP_MD* md, const std::string& name) : m_name(name)
{
EVP_MD_CTX_init(&m_md);
EVP_DigestInit_ex(&m_md, md, nullptr);
}
~OpenSSL_HashFunction()
{
EVP_MD_CTX_cleanup(&m_md);
}
private:
void add_data(const byte input[], size_t length) override
{
EVP_DigestUpdate(&m_md, input, length);
}
void final_result(byte output[]) override
{
EVP_DigestFinal_ex(&m_md, output, nullptr);
const EVP_MD* algo = EVP_MD_CTX_md(&m_md);
EVP_DigestInit_ex(&m_md, algo, nullptr);
}
std::string m_name;
EVP_MD_CTX m_md;
};
std::function<HashFunction* (const HashFunction::Spec&)>
make_evp_hash_maker(const EVP_MD* md, const char* algo)
{
return [md,algo](const HashFunction::Spec&)
{
return new OpenSSL_HashFunction(md, algo);
};
}
#define BOTAN_REGISTER_OPENSSL_EVP_HASH(NAME, EVP) \
BOTAN_REGISTER_TYPE(HashFunction, OpenSSL_HashFunction ## EVP, NAME, \
make_evp_hash_maker(EVP(), NAME), "openssl", BOTAN_OPENSSL_HASH_PRIO)
#if !defined(OPENSSL_NO_SHA)
BOTAN_REGISTER_OPENSSL_EVP_HASH("SHA-160", EVP_sha1);
#endif
#if !defined(OPENSSL_NO_SHA256)
BOTAN_REGISTER_OPENSSL_EVP_HASH("SHA-224", EVP_sha224);
BOTAN_REGISTER_OPENSSL_EVP_HASH("SHA-256", EVP_sha256);
#endif
#if !defined(OPENSSL_NO_SHA512)
BOTAN_REGISTER_OPENSSL_EVP_HASH("SHA-384", EVP_sha384);
BOTAN_REGISTER_OPENSSL_EVP_HASH("SHA-512", EVP_sha512);
#endif
#if !defined(OPENSSL_NO_MD2)
BOTAN_REGISTER_OPENSSL_EVP_HASH("MD2", EVP_md2);
#endif
#if !defined(OPENSSL_NO_MD4)
BOTAN_REGISTER_OPENSSL_EVP_HASH("MD4", EVP_md4);
#endif
#if !defined(OPENSSL_NO_MD5)
BOTAN_REGISTER_OPENSSL_EVP_HASH("MD5", EVP_md5);
#endif
#if !defined(OPENSSL_NO_RIPEMD)
BOTAN_REGISTER_OPENSSL_EVP_HASH("RIPEMD-160", EVP_ripemd160);
#endif
}
}
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