| // Copyright (C) 2010 David Sugar, Tycho Softworks. |
| // |
| // 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" |
| |
| bool HMAC::has(const char *id) |
| { |
| return (EVP_get_digestbyname(id) != NULL); |
| } |
| |
| void HMAC::set(const char *digest, const char *key, size_t len) |
| { |
| secure::init(); |
| |
| release(); |
| |
| if(!len) |
| len = strlen(key); |
| |
| hmactype = EVP_get_digestbyname(digest); |
| if(hmactype && len) { |
| context = new HMAC_CTX; |
| HMAC_CTX_init((HMAC_CTX *)context); |
| HMAC_Init((HMAC_CTX *)context, key, len, (const EVP_MD *)hmactype); |
| } |
| } |
| |
| void HMAC::release(void) |
| { |
| if(context) |
| HMAC_cleanup((HMAC_CTX *)context); |
| |
| if(context) { |
| delete (HMAC_CTX *)context; |
| context = NULL; |
| } |
| |
| bufsize = 0; |
| textbuf[0] = 0; |
| } |
| |
| bool HMAC::put(const void *address, size_t size) |
| { |
| if(!context) |
| return false; |
| |
| HMAC_Update((HMAC_CTX *)context, (const unsigned char *)address, size); |
| return true; |
| } |
| |
| const unsigned char *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; |
| } |
| |