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https://github.com/0xFEEDC0DE64/arduino-esp32.git
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118 lines
3.1 KiB
C++
118 lines
3.1 KiB
C++
/*
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Copyright (c) 2015 Hristo Gochkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <Arduino.h>
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#include <MD5Builder.h>
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uint8_t hex_char_to_byte(uint8_t c)
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{
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return (c >= 'a' && c <= 'f') ? (c - ((uint8_t)'a' - 0xa)) :
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(c >= 'A' && c <= 'F') ? (c - ((uint8_t)'A' - 0xA)) :
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(c >= '0' && c<= '9') ? (c - (uint8_t)'0') : 0;
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}
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void MD5Builder::begin(void)
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{
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memset(_buf, 0x00, 16);
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MD5Init(&_ctx);
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}
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void MD5Builder::add(uint8_t * data, uint16_t len)
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{
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MD5Update(&_ctx, data, len);
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}
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void MD5Builder::addHexString(const char * data)
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{
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uint16_t i, len = strlen(data);
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uint8_t * tmp = (uint8_t*)malloc(len/2);
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if(tmp == NULL) {
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return;
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}
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for(i=0; i<len; i+=2) {
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uint8_t high = hex_char_to_byte(data[i]);
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uint8_t low = hex_char_to_byte(data[i+1]);
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tmp[i/2] = (high & 0x0F) << 4 | (low & 0x0F);
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}
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add(tmp, len/2);
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free(tmp);
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}
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bool MD5Builder::addStream(Stream & stream, const size_t maxLen)
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{
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const int buf_size = 512;
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int maxLengthLeft = maxLen;
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uint8_t * buf = (uint8_t*) malloc(buf_size);
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if(!buf) {
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return false;
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}
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int bytesAvailable = stream.available();
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while((bytesAvailable > 0) && (maxLengthLeft > 0)) {
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// determine number of bytes to read
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int readBytes = bytesAvailable;
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if(readBytes > maxLengthLeft) {
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readBytes = maxLengthLeft ; // read only until max_len
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}
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if(readBytes > buf_size) {
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readBytes = buf_size; // not read more the buffer can handle
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}
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// read data and check if we got something
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int numBytesRead = stream.readBytes(buf, readBytes);
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if(numBytesRead< 1) {
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return false;
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}
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// Update MD5 with buffer payload
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MD5Update(&_ctx, buf, numBytesRead);
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// update available number of bytes
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maxLengthLeft -= numBytesRead;
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bytesAvailable = stream.available();
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}
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free(buf);
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return true;
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}
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void MD5Builder::calculate(void)
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{
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MD5Final(_buf, &_ctx);
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}
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void MD5Builder::getBytes(uint8_t * output)
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{
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memcpy(output, _buf, 16);
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}
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void MD5Builder::getChars(char * output)
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{
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for(uint8_t i = 0; i < 16; i++) {
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sprintf(output + (i * 2), "%02x", _buf[i]);
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}
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}
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String MD5Builder::toString(void)
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{
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char out[33];
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getChars(out);
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return String(out);
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}
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