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