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hlsdemux: Support OpenSSL for AES decryption of HLS fragments

Browse source 
https://bugzilla.gnome.org//show_bug.cgi?id=735248
This commit is contained in:
Thomas Bluemel 2014-08-22 15:18:59 -06:00 committed by Sebastian Dröge
parent 8d6f745b78
commit 04ca723461
4 changed files with 52 additions and 5 deletions
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6
configure.ac
View file

@ -3001,10 +3001,16 @@ AG_GST_CHECK_FEATURE(HLS, [http live streaming plugin], hls, [
[
AC_DEFINE(HAVE_LIBGCRYPT, 1, [Define if libgcrypt is available])
HAVE_HLS="yes"
], [
PKG_CHECK_MODULES(OPENSSL, openssl,
[
AC_DEFINE(HAVE_OPENSSL, 1, [Define if openssl is available])
HAVE_HLS="yes"
], [
HAVE_HLS="no"
])
])
])
])
else

2
ext/hls/Makefile.am
View file

@ -12,7 +12,7 @@ libgstfragmented_la_CFLAGS = $(GST_PLUGINS_BAD_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS
libgstfragmented_la_LIBADD = \
$(top_builddir)/gst-libs/gst/uridownloader/libgsturidownloader-@GST_API_VERSION@.la \
$(GST_PLUGINS_BASE_LIBS) -lgstpbutils-$(GST_API_VERSION) -lgstvideo-$(GST_API_VERSION) \
$(GST_BASE_LIBS) $(GST_LIBS) $(GIO_LIBS) $(LIBM) $(LIBGCRYPT_LIBS) $(NETTLE_LIBS)
$(GST_BASE_LIBS) $(GST_LIBS) $(GIO_LIBS) $(LIBM) $(LIBGCRYPT_LIBS) $(NETTLE_LIBS) $(OPENSSL_LIBS)
libgstfragmented_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) -no-undefined
libgstfragmented_la_LIBTOOLFLAGS = $(GST_PLUGIN_LIBTOOLFLAGS)

39
ext/hls/gsthlsdemux.c
View file

@ -1779,7 +1779,44 @@ gst_hls_demux_switch_playlist (GstHLSDemux * demux)
return gst_hls_demux_change_playlist (demux, bitrate * demux->bitrate_limit);
}
#ifdef HAVE_NETTLE
#if defined(HAVE_OPENSSL)
static gboolean
gst_hls_demux_decrypt_start (GstHLSDemux * demux, const guint8 * key_data,
const guint8 * iv_data)
{
EVP_CIPHER_CTX_init (&demux->aes_ctx);
if (!EVP_DecryptInit_ex (&demux->aes_ctx, EVP_aes_128_cbc (), NULL, key_data,
iv_data))
return FALSE;
EVP_CIPHER_CTX_set_padding (&demux->aes_ctx, 0);
return TRUE;
}
static gboolean
decrypt_fragment (GstHLSDemux * demux, gsize length,
const guint8 * encrypted_data, guint8 * decrypted_data)
{
int len, flen = 0;
if (G_UNLIKELY (length > G_MAXINT || length % 16 != 0))
return FALSE;
len = (int) length;
if (!EVP_DecryptUpdate (&demux->aes_ctx, decrypted_data, &len, encrypted_data,
len))
return FALSE;
EVP_DecryptFinal_ex (&demux->aes_ctx, decrypted_data + len, &flen);
g_return_val_if_fail (len + flen == length, FALSE);
return TRUE;
}
static void
gst_hls_demux_decrypt_end (GstHLSDemux * demux)
{
EVP_CIPHER_CTX_cleanup (&demux->aes_ctx);
}
#elif defined(HAVE_NETTLE)
static gboolean
gst_hls_demux_decrypt_start (GstHLSDemux * demux, const guint8 * key_data,
const guint8 * iv_data)

8
ext/hls/gsthlsdemux.h
View file

@ -29,7 +29,9 @@
#include "m3u8.h"
#include "gstfragmented.h"
#include <gst/uridownloader/gsturidownloader.h>
#ifdef HAVE_NETTLE
#if defined(HAVE_OPENSSL)
#include <openssl/evp.h>
#elif defined(HAVE_NETTLE)
#include <nettle/aes.h>
#include <nettle/cbc.h>
#else
@ -129,7 +131,9 @@ struct _GstHLSDemux
GError *last_error;
/* decryption tooling */
#ifdef HAVE_NETTLE
#if defined(HAVE_OPENSSL)
EVP_CIPHER_CTX aes_ctx;
#elif defined(HAVE_NETTLE)
struct CBC_CTX (struct aes_ctx, AES_BLOCK_SIZE) aes_ctx;
#else
gcry_cipher_hd_t aes_ctx;