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187 lines
5.2 KiB
C
187 lines
5.2 KiB
C
/*
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* GStreamer gstreamer-aeshelper
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*
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* Copyright, LCC (C) 2015 RidgeRun, LCC <carsten.behling@ridgerun.com>
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* Copyright, LCC (C) 2016 RidgeRun, LCC <jose.jimenez@ridgerun.com>
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* Copyright (C) 2020 Nice, Contact: Rabindra Harlalka <Rabindra.Harlalka@nice.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Alternatively, the contents of this file may be used under the
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* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
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* which case the following provisions apply instead of the ones
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* mentioned above:
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*
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1335, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "gstaeshelper.h"
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GType
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gst_aes_cipher_get_type (void)
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{
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static GType aes_cipher_type = 0;
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if (g_once_init_enter (&aes_cipher_type)) {
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static GEnumValue aes_cipher_types[] = {
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{GST_AES_CIPHER_128_CBC, "AES 128 bit cipher key using CBC method",
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"aes-128-cbc"},
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{GST_AES_CIPHER_256_CBC,
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"AES 256 bit cipher key using CBC method",
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"aes-256-cbc"},
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{0, NULL, NULL},
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};
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GType temp = g_enum_register_static ("GstAesCipher",
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aes_cipher_types);
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g_once_init_leave (&aes_cipher_type, temp);
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}
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return aes_cipher_type;
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}
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const gchar *
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gst_aes_cipher_enum_to_string (GstAesCipher cipher)
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{
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switch (cipher) {
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case GST_AES_CIPHER_128_CBC:
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return "aes-128-cbc";
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break;
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case GST_AES_CIPHER_256_CBC:
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return "aes-256-cbc";
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break;
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}
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return "";
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}
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gchar
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gst_aes_nibble_to_hex (gchar in)
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{
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return in < 10 ? in + 48 : in + 55;
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}
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/*
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* gst_aes_bytearray2hexstring
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*
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* convert array of bytes to hex string
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*
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* @param in input byte array
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* @param out allocated hex string for output
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* @param len length of input byte array
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*
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* @return output hex string
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*/
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gchar *
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gst_aes_bytearray2hexstring (const guchar * in, gchar * const out,
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const gushort len)
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{
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gushort i;
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gchar high;
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gchar low;
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for (i = 0; i < len; i++) {
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high = (in[i] & 0xF0) >> 4;
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low = in[i] & 0x0F;
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out[i * 2] = gst_aes_nibble_to_hex (high);
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out[i * 2 + 1] = gst_aes_nibble_to_hex (low);
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}
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out[len * 2] = 0; /* null terminate */
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return out;
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}
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/*
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* gst_aes_hexstring2bytearray
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*
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* convert hex string to array of bytes
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*
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* @param filter calling element
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* @param in input hex string
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* @param allocated byte array for output
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*
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* @return output byte array
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*/
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guint
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gst_aes_hexstring2bytearray (GstElement * filter, const gchar * in,
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guchar * out)
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{
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gchar byte_val;
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guint hex_count = 0;
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GST_LOG_OBJECT (filter, "Converting hex string to number");
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g_return_val_if_fail (in && out, 0);
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while (*in != 0) {
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/* Compute fist half-byte */
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if (*in >= 'A' && *in <= 'F') {
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byte_val = (*in - 55) << 4;
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} else if (*in >= 'a' && *in <= 'f') {
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byte_val = (*in - 87) << 4;
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} else if (*in >= '0' && *in <= '9') {
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byte_val = (*in - 48) << 4;
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} else {
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return 0;
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}
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in++;
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if (*in == 0) {
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break;
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}
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/* Compute second half-byte */
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if (*in >= 'A' && *in <= 'F') {
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*out = (*in - 55) + byte_val;
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} else if (*in >= 'a' && *in <= 'f') {
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*out = (*in - 87) + byte_val;
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} else if (*in >= '0' && *in <= '9') {
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*out = (*in - 48) + byte_val;
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} else {
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return 0;
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}
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GST_LOG_OBJECT (filter, "ch: %c%c, hex: 0x%x", *(in - 1), *in, *out);
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in++;
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out++;
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if (!in || !out)
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return 0;
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hex_count++;
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}
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GST_LOG_OBJECT (filter, "Hex string conversion successful");
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return hex_count;
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}
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