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// Copyright (C) 2010-2014 David Sugar, Tycho Softworks.
// Copyright (C) 2015-2020 Cherokees of Idaho.
//
// This file is part of GNU uCommon C++.
//
// GNU uCommon C++ is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU uCommon C++ is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with GNU uCommon C++. If not, see <http://www.gnu.org/licenses/>.
#include "local.h"
namespace ucommon {
bool HMAC::has(const char *id)
{
return (EVP_get_digestbyname(id) != NULL);
}
void HMAC::set(const char *digest, const secure::keybytes& key)
{
secure::init();
release();
size_t len = key.size() / 8;
hmactype = EVP_get_digestbyname(digest);
if(hmactype && len) {
context = HMAC_CTX_new();
HMAC_Init_ex((HMAC_CTX *)context, *key, (int)len, (const EVP_MD *)hmactype, NULL);
}
}
void HMAC::release(void)
{
if(context) {
HMAC_CTX_free((HMAC_CTX *)context);
context = NULL;
}
bufsize = 0;
memset(textbuf, 0, sizeof(textbuf));
}
bool HMAC::put(const void *address, size_t size)
{
if(!context)
return false;
HMAC_Update((HMAC_CTX *)context, (const uint8_t *)address, size);
return true;
}
const uint8_t *HMAC::get(void)
{
unsigned count = 0;
unsigned size = 0;
if(bufsize)
return buffer;
if(!context)
return NULL;
HMAC_Final((HMAC_CTX *)context, buffer, &size);
release();
if(!size)
return NULL;
bufsize = size;
while(count < bufsize) {
snprintf(textbuf + (count * 2), 3, "%2.2x", buffer[count]);
++count;
}
return buffer;
}
} // namespace ucommon
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