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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 {
void Digest::release(void)
{
if(context) {
gnutls_hash_deinit((MD_CTX)context, buffer);
context = NULL;
}
bufsize = 0;
memset(textbuf, 0, sizeof(textbuf));
hashid = 0;
}
int __context::map_digest(const char *type)
{
if(eq_case(type, "sha") || eq_case(type, "sha1") || eq_case(type, "sha160"))
return GNUTLS_DIG_SHA1;
else if(eq_case(type, "sha256"))
return GNUTLS_DIG_SHA256;
else if(eq_case(type, "sha512"))
return GNUTLS_DIG_SHA512;
else if(eq_case(type, "md5"))
return GNUTLS_DIG_MD5;
else if(eq_case(type, "md2"))
return GNUTLS_DIG_MD2;
else if(eq_case(type, "rmd160"))
return GNUTLS_DIG_RMD160;
else
return 0;
}
void Digest::set(const char *type)
{
secure::init();
release();
hashid = __context::map_digest(type);
if(!hashid || gnutls_hash_get_len((MD_ID)hashid) < 1) {
hashid = 0;
return;
}
gnutls_hash_init((MD_CTX *)&context, (MD_ID)hashid);
}
bool Digest::has(const char *type)
{
MD_ID id = (MD_ID)__context::map_digest(type);
if(!id || (gnutls_hash_get_len(id) < 1))
return false;
return true;
}
bool Digest::put(const void *address, size_t size)
{
if(!context || hashid == 0)
return false;
gnutls_hash((MD_CTX)context, address, size);
return true;
}
void Digest::reset(void)
{
uint8_t temp[MAX_DIGEST_HASHSIZE / 8];
if(context) {
gnutls_hash_deinit((MD_CTX)context, temp);
context = NULL;
}
if(hashid == 0)
return;
gnutls_hash_init((MD_CTX *)&context, (MD_ID)hashid);
bufsize = 0;
}
void Digest::recycle(bool bin)
{
unsigned size = bufsize;
if(!context || hashid == 0)
return;
if(!bufsize) {
gnutls_hash_deinit((MD_CTX)context, buffer);
context = NULL;
gnutls_hash_init((MD_CTX *)&context, (MD_ID)hashid);
}
else
Digest::reset();
size = gnutls_hash_get_len((MD_ID)hashid);
if(!size || !context || !hashid)
return;
if(bin)
gnutls_hash((MD_CTX)context, buffer, size);
else {
unsigned count = 0;
while(count < size) {
snprintf(textbuf + (count * 2), 3, "%2.2x",
buffer[count]);
++count;
}
gnutls_hash((MD_CTX)context, textbuf, size * 2);
}
bufsize = 0;
}
const uint8_t *Digest::get(void)
{
unsigned count = 0;
unsigned size = 0;
if(bufsize)
return buffer;
if(!context || hashid == 0)
return NULL;
gnutls_hash_deinit((MD_CTX)context, buffer);
size = gnutls_hash_get_len((MD_ID)hashid);
context = NULL;
bufsize = size;
while(count < bufsize) {
snprintf(textbuf + (count * 2), 3, "%2.2x",
buffer[count]);
++count;
}
return buffer;
}
} // namespace ucommon
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