libavformat/rtmpcrypt.c - third_party/ffmpeg - Git at Google

 /*
  * RTMPE network protocol
  * Copyright (c) 2008-2009 Andrej Stepanchuk
  * Copyright (c) 2009-2010 Howard Chu
  * Copyright (c) 2012 Samuel Pitoiset
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg 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 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg 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 FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 /**
  * @file
  * RTMPE protocol
  */

 #include "libavutil/blowfish.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/opt.h"
 #include "libavutil/rc4.h"
 #include "libavutil/xtea.h"

 #include "internal.h"
 #include "rtmp.h"
 #include "rtmpdh.h"
 #include "rtmpcrypt.h"
 #include "url.h"

 /* protocol handler context */
 typedef struct RTMPEContext {
     const AVClass *class;
     URLContext   *stream;            ///< TCP stream
     FF_DH        *dh;                ///< Diffie-Hellman context
     struct AVRC4 key_in;             ///< RC4 key used for decrypt data
     struct AVRC4 key_out;            ///< RC4 key used for encrypt data
     int          handshaked;         ///< flag indicating when the handshake is performed
     int          tunneling;          ///< use a HTTP connection (RTMPTE)
 } RTMPEContext;

 static const uint8_t rtmpe8_keys[16][16] = {
     { 0xb2, 0x34, 0xf0, 0xbf, 0x1f, 0x08, 0xd9, 0x11,
       0x95, 0xb7, 0xdf, 0xcc, 0x32, 0xe7, 0x8d, 0x74 },
     { 0xb6, 0x5e, 0x6a, 0x08, 0x0e, 0x09, 0x43, 0x17,
       0xb8, 0x5a, 0xf0, 0x6e, 0xe2, 0x39, 0x5a, 0xfe },
     { 0x6f, 0x95, 0x10, 0x7b, 0x21, 0x05, 0xce, 0x76,
       0x3a, 0xa7, 0x88, 0x23, 0xa1, 0x49, 0x01, 0x44 },
     { 0x17, 0xf3, 0x43, 0xa9, 0xb2, 0x1b, 0xf1, 0xeb,
       0xee, 0xa5, 0x91, 0xa6, 0x39, 0x63, 0xf3, 0x17 },
     { 0x0a, 0xe0, 0x30, 0x7a, 0x2c, 0xe2, 0x29, 0xb5,
       0xa5, 0xae, 0x87, 0xa0, 0xac, 0x79, 0xcb, 0xc0 },
     { 0x23, 0x0c, 0xce, 0xbd, 0xff, 0xde, 0xeb, 0x2f,
       0x16, 0xae, 0xfa, 0x1c, 0x9d, 0x23, 0x23, 0x11 },
     { 0x7b, 0x3f, 0xdd, 0x55, 0x2e, 0xe6, 0xe7, 0x77,
       0x99, 0xc4, 0xb8, 0x9b, 0xe4, 0x1e, 0x48, 0xc9 },
     { 0xb4, 0xb6, 0x7b, 0x40, 0x36, 0x91, 0xe8, 0x71,
       0x55, 0xbf, 0xae, 0xa7, 0x39, 0xb8, 0x33, 0xca },
     { 0xc3, 0xbd, 0xf6, 0xfc, 0x97, 0x36, 0x3c, 0xb6,
       0x25, 0xf8, 0xe4, 0x7c, 0xb2, 0x59, 0xd9, 0x04 },
     { 0xfd, 0x91, 0xe0, 0x28, 0x4c, 0x4c, 0x95, 0x41,
       0x00, 0xdb, 0xb7, 0x7f, 0xf8, 0x66, 0xa0, 0xe3 },
     { 0x76, 0x5b, 0x84, 0x57, 0x03, 0x1b, 0x25, 0x4f,
       0xcd, 0x5b, 0xd4, 0x46, 0x29, 0x0d, 0xc3, 0xa2 },
     { 0xf8, 0xee, 0xcc, 0x0a, 0x46, 0xb5, 0x55, 0xda,
       0x52, 0x34, 0x47, 0x03, 0x3b, 0x71, 0x63, 0x58 },
     { 0xdc, 0x75, 0x20, 0xb8, 0xee, 0x1f, 0x5f, 0xa7,
       0xe8, 0x68, 0x42, 0xd8, 0xcc, 0x44, 0x2a, 0xa7 },
     { 0x9e, 0x6e, 0xcf, 0x07, 0x25, 0x7b, 0x6d, 0xa1,
       0x6c, 0xae, 0xa7, 0x9f, 0x29, 0x56, 0x2f, 0xd9 },
     { 0xe4, 0xea, 0xb1, 0xfe, 0xe1, 0x3c, 0x8c, 0x8c,
       0xa7, 0x64, 0x00, 0x4e, 0x2a, 0x7c, 0x38, 0x6a },
     { 0x27, 0x94, 0x3a, 0x89, 0xa2, 0x13, 0x30, 0xcc,
       0x5b, 0x38, 0x06, 0xf1, 0x27, 0xf9, 0x29, 0xa8 }
 };

 static const uint8_t rtmpe9_keys[16][24] = {
     { 0x79, 0x34, 0x77, 0x4c, 0x67, 0xd1, 0x38, 0x3a, 0xdf, 0xb3, 0x56, 0xbe,
       0x8b, 0x7b, 0xd0, 0x24, 0x38, 0xe0, 0x73, 0x58, 0x41, 0x5d, 0x69, 0x67, },
     { 0x46, 0xf6, 0xb4, 0xcc, 0x01, 0x93, 0xe3, 0xa1, 0x9e, 0x7d, 0x3c, 0x65,
       0x55, 0x86, 0xfd, 0x09, 0x8f, 0xf7, 0xb3, 0xc4, 0x6f, 0x41, 0xca, 0x5c, },
     { 0x1a, 0xe7, 0xe2, 0xf3, 0xf9, 0x14, 0x79, 0x94, 0xc0, 0xd3, 0x97, 0x43,
       0x08, 0x7b, 0xb3, 0x84, 0x43, 0x2f, 0x9d, 0x84, 0x3f, 0x21, 0x01, 0x9b, },
     { 0xd3, 0xe3, 0x54, 0xb0, 0xf7, 0x1d, 0xf6, 0x2b, 0x5a, 0x43, 0x4d, 0x04,
       0x83, 0x64, 0x3e, 0x0d, 0x59, 0x2f, 0x61, 0xcb, 0xb1, 0x6a, 0x59, 0x0d, },
     { 0xc8, 0xc1, 0xe9, 0xb8, 0x16, 0x56, 0x99, 0x21, 0x7b, 0x5b, 0x36, 0xb7,
       0xb5, 0x9b, 0xdf, 0x06, 0x49, 0x2c, 0x97, 0xf5, 0x95, 0x48, 0x85, 0x7e, },
     { 0xeb, 0xe5, 0xe6, 0x2e, 0xa4, 0xba, 0xd4, 0x2c, 0xf2, 0x16, 0xe0, 0x8f,
       0x66, 0x23, 0xa9, 0x43, 0x41, 0xce, 0x38, 0x14, 0x84, 0x95, 0x00, 0x53, },
     { 0x66, 0xdb, 0x90, 0xf0, 0x3b, 0x4f, 0xf5, 0x6f, 0xe4, 0x9c, 0x20, 0x89,
       0x35, 0x5e, 0xd2, 0xb2, 0xc3, 0x9e, 0x9f, 0x7f, 0x63, 0xb2, 0x28, 0x81, },
     { 0xbb, 0x20, 0xac, 0xed, 0x2a, 0x04, 0x6a, 0x19, 0x94, 0x98, 0x9b, 0xc8,
       0xff, 0xcd, 0x93, 0xef, 0xc6, 0x0d, 0x56, 0xa7, 0xeb, 0x13, 0xd9, 0x30, },
     { 0xbc, 0xf2, 0x43, 0x82, 0x09, 0x40, 0x8a, 0x87, 0x25, 0x43, 0x6d, 0xe6,
       0xbb, 0xa4, 0xb9, 0x44, 0x58, 0x3f, 0x21, 0x7c, 0x99, 0xbb, 0x3f, 0x24, },
     { 0xec, 0x1a, 0xaa, 0xcd, 0xce, 0xbd, 0x53, 0x11, 0xd2, 0xfb, 0x83, 0xb6,
       0xc3, 0xba, 0xab, 0x4f, 0x62, 0x79, 0xe8, 0x65, 0xa9, 0x92, 0x28, 0x76, },
     { 0xc6, 0x0c, 0x30, 0x03, 0x91, 0x18, 0x2d, 0x7b, 0x79, 0xda, 0xe1, 0xd5,
       0x64, 0x77, 0x9a, 0x12, 0xc5, 0xb1, 0xd7, 0x91, 0x4f, 0x96, 0x4c, 0xa3, },
     { 0xd7, 0x7c, 0x2a, 0xbf, 0xa6, 0xe7, 0x85, 0x7c, 0x45, 0xad, 0xff, 0x12,
       0x94, 0xd8, 0xde, 0xa4, 0x5c, 0x3d, 0x79, 0xa4, 0x44, 0x02, 0x5d, 0x22, },
     { 0x16, 0x19, 0x0d, 0x81, 0x6a, 0x4c, 0xc7, 0xf8, 0xb8, 0xf9, 0x4e, 0xcd,
       0x2c, 0x9e, 0x90, 0x84, 0xb2, 0x08, 0x25, 0x60, 0xe1, 0x1e, 0xae, 0x18, },
     { 0xe9, 0x7c, 0x58, 0x26, 0x1b, 0x51, 0x9e, 0x49, 0x82, 0x60, 0x61, 0xfc,
       0xa0, 0xa0, 0x1b, 0xcd, 0xf5, 0x05, 0xd6, 0xa6, 0x6d, 0x07, 0x88, 0xa3, },
     { 0x2b, 0x97, 0x11, 0x8b, 0xd9, 0x4e, 0xd9, 0xdf, 0x20, 0xe3, 0x9c, 0x10,
       0xe6, 0xa1, 0x35, 0x21, 0x11, 0xf9, 0x13, 0x0d, 0x0b, 0x24, 0x65, 0xb2, },
     { 0x53, 0x6a, 0x4c, 0x54, 0xac, 0x8b, 0x9b, 0xb8, 0x97, 0x29, 0xfc, 0x60,
       0x2c, 0x5b, 0x3a, 0x85, 0x68, 0xb5, 0xaa, 0x6a, 0x44, 0xcd, 0x3f, 0xa7, },
 };

 int ff_rtmpe_gen_pub_key(URLContext *h, uint8_t *buf)
 {
     RTMPEContext *rt = h->priv_data;
     int offset, ret;

     if (!(rt->dh = ff_dh_init(1024)))
         return AVERROR(ENOMEM);

     offset = ff_rtmp_calc_digest_pos(buf, 768, 632, 8);
     if (offset < 0)
         return offset;

     /* generate a Diffie-Hellmann public key */
     if ((ret = ff_dh_generate_public_key(rt->dh)) < 0)
         return ret;

     /* write the public key into the handshake buffer */
     if ((ret = ff_dh_write_public_key(rt->dh, buf + offset, 128)) < 0)
         return ret;

     return 0;
 }

 int ff_rtmpe_compute_secret_key(URLContext *h, const uint8_t *serverdata,
                                 const uint8_t *clientdata, int type)
 {
     RTMPEContext *rt = h->priv_data;
     uint8_t secret_key[128], digest[32];
     int server_pos, client_pos;
     int ret;

     if (type) {
         if ((server_pos = ff_rtmp_calc_digest_pos(serverdata, 1532, 632, 772)) < 0)
             return server_pos;
     } else {
         if ((server_pos = ff_rtmp_calc_digest_pos(serverdata, 768, 632, 8)) < 0)
             return server_pos;
     }

     if ((client_pos = ff_rtmp_calc_digest_pos(clientdata, 768, 632, 8)) < 0)
         return client_pos;

     /* compute the shared secret secret in order to compute RC4 keys */
     if ((ret = ff_dh_compute_shared_secret_key(rt->dh, serverdata + server_pos,
                                                128, secret_key, sizeof(secret_key))) < 0)
         return ret;

     /* set output key */
     if ((ret = ff_rtmp_calc_digest(serverdata + server_pos, 128, 0, secret_key,
                                    128, digest)) < 0)
         return ret;
     av_rc4_init(&rt->key_out, digest, 16 * 8, 1);

     /* set input key */
     if ((ret = ff_rtmp_calc_digest(clientdata + client_pos, 128, 0, secret_key,
                                    128, digest)) < 0)
         return ret;
     av_rc4_init(&rt->key_in, digest, 16 * 8, 1);

     return 0;
 }

 static void rtmpe8_sig(const uint8_t *in, uint8_t *out, int key_id)
 {
     struct AVXTEA ctx;

     av_xtea_le_init(&ctx, rtmpe8_keys[key_id]);
     av_xtea_le_crypt(&ctx, out, in, 1, NULL, 0);
 }

 static void rtmpe9_sig(const uint8_t *in, uint8_t *out, int key_id)
 {
     struct AVBlowfish ctx;
     uint32_t xl, xr;

     xl = AV_RL32(in);
     xr = AV_RL32(in + 4);

     av_blowfish_init(&ctx, rtmpe9_keys[key_id], 24);
     av_blowfish_crypt_ecb(&ctx, &xl, &xr, 0);

     AV_WL32(out, xl);
     AV_WL32(out + 4, xr);
 }

 void ff_rtmpe_encrypt_sig(URLContext *h, uint8_t *sig, const uint8_t *digest,
                           int type)
 {
     int i;

     for (i = 0; i < 32; i += 8) {
         if (type == 8) {
             /* RTMPE type 8 uses XTEA on the signature */
             rtmpe8_sig(sig + i, sig + i, digest[i] % 15);
         } else if (type == 9) {
             /* RTMPE type 9 uses Blowfish on the signature */
             rtmpe9_sig(sig + i, sig + i, digest[i] % 15);
         }
     }
 }

 int ff_rtmpe_update_keystream(URLContext *h)
 {
     RTMPEContext *rt = h->priv_data;
     char buf[RTMP_HANDSHAKE_PACKET_SIZE];

     /* skip past 1536 bytes of the RC4 bytestream */
     av_rc4_crypt(&rt->key_in, buf, NULL, sizeof(buf), NULL, 1);
     av_rc4_crypt(&rt->key_out, buf, NULL, sizeof(buf), NULL, 1);

     /* the next requests will be encrypted using RC4 keys */
     rt->handshaked = 1;

     return 0;
 }

 static int rtmpe_close(URLContext *h)
 {
     RTMPEContext *rt = h->priv_data;

     ff_dh_free(rt->dh);
     ffurl_close(rt->stream);

     return 0;
 }

 static int rtmpe_open(URLContext *h, const char *uri, int flags)
 {
     RTMPEContext *rt = h->priv_data;
     char host[256], url[1024];
     int ret, port;

     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);

     if (rt->tunneling) {
         if (port < 0)
             port = 80;
         ff_url_join(url, sizeof(url), "ffrtmphttp", NULL, host, port, NULL);
     } else {
         if (port < 0)
             port = 1935;
         ff_url_join(url, sizeof(url), "tcp", NULL, host, port, NULL);
     }

     /* open the tcp or ffrtmphttp connection */
     if ((ret = ffurl_open_whitelist(&rt->stream, url, AVIO_FLAG_READ_WRITE,
                                     &h->interrupt_callback, NULL,
                                     h->protocol_whitelist, h->protocol_blacklist, h)) < 0) {
         rtmpe_close(h);
         return ret;
     }

     return 0;
 }

 static int rtmpe_read(URLContext *h, uint8_t *buf, int size)
 {
     RTMPEContext *rt = h->priv_data;
     int ret;

     rt->stream->flags |= h->flags & AVIO_FLAG_NONBLOCK;
     ret = ffurl_read(rt->stream, buf, size);
     rt->stream->flags &= ~AVIO_FLAG_NONBLOCK;

     if (ret < 0 && ret != AVERROR_EOF)
         return ret;

     if (rt->handshaked && ret > 0) {
         /* decrypt data received by the server */
         av_rc4_crypt(&rt->key_in, buf, buf, ret, NULL, 1);
     }

     return ret;
 }

 static int rtmpe_write(URLContext *h, const uint8_t *buf, int size)
 {
     RTMPEContext *rt = h->priv_data;
     int ret;

     if (rt->handshaked) {
         /* encrypt data to send to the server */
         av_rc4_crypt(&rt->key_out, (uint8_t *)buf, buf, size, NULL, 1);
     }

     if ((ret = ffurl_write(rt->stream, buf, size)) < 0)
         return ret;

     return size;
 }

 #define OFFSET(x) offsetof(RTMPEContext, x)
 #define DEC AV_OPT_FLAG_DECODING_PARAM

 static const AVOption ffrtmpcrypt_options[] = {
     {"ffrtmpcrypt_tunneling", "Use a HTTP tunneling connection (RTMPTE).", OFFSET(tunneling), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC},
     { NULL },
 };

 static const AVClass ffrtmpcrypt_class = {
     .class_name = "ffrtmpcrypt",
     .item_name  = av_default_item_name,
     .option     = ffrtmpcrypt_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 const URLProtocol ff_ffrtmpcrypt_protocol = {
     .name            = "ffrtmpcrypt",
     .url_open        = rtmpe_open,
     .url_read        = rtmpe_read,
     .url_write       = rtmpe_write,
     .url_close       = rtmpe_close,
     .priv_data_size  = sizeof(RTMPEContext),
     .flags           = URL_PROTOCOL_FLAG_NETWORK,
     .priv_data_class = &ffrtmpcrypt_class,
 };
	/*
	* RTMPE network protocol
	* Copyright (c) 2008-2009 Andrej Stepanchuk
	* Copyright (c) 2009-2010 Howard Chu
	* Copyright (c) 2012 Samuel Pitoiset
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg 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 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg 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 FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	/**
	* @file
	* RTMPE protocol
	*/

	#include "libavutil/blowfish.h"
	#include "libavutil/intreadwrite.h"
	#include "libavutil/opt.h"
	#include "libavutil/rc4.h"
	#include "libavutil/xtea.h"

	#include "internal.h"
	#include "rtmp.h"
	#include "rtmpdh.h"
	#include "rtmpcrypt.h"
	#include "url.h"

	/* protocol handler context */
	typedef struct RTMPEContext {
	const AVClass *class;
	URLContext *stream; ///< TCP stream
	FF_DH *dh; ///< Diffie-Hellman context
	struct AVRC4 key_in; ///< RC4 key used for decrypt data
	struct AVRC4 key_out; ///< RC4 key used for encrypt data
	int handshaked; ///< flag indicating when the handshake is performed
	int tunneling; ///< use a HTTP connection (RTMPTE)
	} RTMPEContext;

	static const uint8_t rtmpe8_keys[16][16] = {
	{ 0xb2, 0x34, 0xf0, 0xbf, 0x1f, 0x08, 0xd9, 0x11,
	0x95, 0xb7, 0xdf, 0xcc, 0x32, 0xe7, 0x8d, 0x74 },
	{ 0xb6, 0x5e, 0x6a, 0x08, 0x0e, 0x09, 0x43, 0x17,
	0xb8, 0x5a, 0xf0, 0x6e, 0xe2, 0x39, 0x5a, 0xfe },
	{ 0x6f, 0x95, 0x10, 0x7b, 0x21, 0x05, 0xce, 0x76,
	0x3a, 0xa7, 0x88, 0x23, 0xa1, 0x49, 0x01, 0x44 },
	{ 0x17, 0xf3, 0x43, 0xa9, 0xb2, 0x1b, 0xf1, 0xeb,
	0xee, 0xa5, 0x91, 0xa6, 0x39, 0x63, 0xf3, 0x17 },
	{ 0x0a, 0xe0, 0x30, 0x7a, 0x2c, 0xe2, 0x29, 0xb5,
	0xa5, 0xae, 0x87, 0xa0, 0xac, 0x79, 0xcb, 0xc0 },
	{ 0x23, 0x0c, 0xce, 0xbd, 0xff, 0xde, 0xeb, 0x2f,
	0x16, 0xae, 0xfa, 0x1c, 0x9d, 0x23, 0x23, 0x11 },
	{ 0x7b, 0x3f, 0xdd, 0x55, 0x2e, 0xe6, 0xe7, 0x77,
	0x99, 0xc4, 0xb8, 0x9b, 0xe4, 0x1e, 0x48, 0xc9 },
	{ 0xb4, 0xb6, 0x7b, 0x40, 0x36, 0x91, 0xe8, 0x71,
	0x55, 0xbf, 0xae, 0xa7, 0x39, 0xb8, 0x33, 0xca },
	{ 0xc3, 0xbd, 0xf6, 0xfc, 0x97, 0x36, 0x3c, 0xb6,
	0x25, 0xf8, 0xe4, 0x7c, 0xb2, 0x59, 0xd9, 0x04 },
	{ 0xfd, 0x91, 0xe0, 0x28, 0x4c, 0x4c, 0x95, 0x41,
	0x00, 0xdb, 0xb7, 0x7f, 0xf8, 0x66, 0xa0, 0xe3 },
	{ 0x76, 0x5b, 0x84, 0x57, 0x03, 0x1b, 0x25, 0x4f,
	0xcd, 0x5b, 0xd4, 0x46, 0x29, 0x0d, 0xc3, 0xa2 },
	{ 0xf8, 0xee, 0xcc, 0x0a, 0x46, 0xb5, 0x55, 0xda,
	0x52, 0x34, 0x47, 0x03, 0x3b, 0x71, 0x63, 0x58 },
	{ 0xdc, 0x75, 0x20, 0xb8, 0xee, 0x1f, 0x5f, 0xa7,
	0xe8, 0x68, 0x42, 0xd8, 0xcc, 0x44, 0x2a, 0xa7 },
	{ 0x9e, 0x6e, 0xcf, 0x07, 0x25, 0x7b, 0x6d, 0xa1,
	0x6c, 0xae, 0xa7, 0x9f, 0x29, 0x56, 0x2f, 0xd9 },
	{ 0xe4, 0xea, 0xb1, 0xfe, 0xe1, 0x3c, 0x8c, 0x8c,
	0xa7, 0x64, 0x00, 0x4e, 0x2a, 0x7c, 0x38, 0x6a },
	{ 0x27, 0x94, 0x3a, 0x89, 0xa2, 0x13, 0x30, 0xcc,
	0x5b, 0x38, 0x06, 0xf1, 0x27, 0xf9, 0x29, 0xa8 }
	};

	static const uint8_t rtmpe9_keys[16][24] = {
	{ 0x79, 0x34, 0x77, 0x4c, 0x67, 0xd1, 0x38, 0x3a, 0xdf, 0xb3, 0x56, 0xbe,
	0x8b, 0x7b, 0xd0, 0x24, 0x38, 0xe0, 0x73, 0x58, 0x41, 0x5d, 0x69, 0x67, },
	{ 0x46, 0xf6, 0xb4, 0xcc, 0x01, 0x93, 0xe3, 0xa1, 0x9e, 0x7d, 0x3c, 0x65,
	0x55, 0x86, 0xfd, 0x09, 0x8f, 0xf7, 0xb3, 0xc4, 0x6f, 0x41, 0xca, 0x5c, },
	{ 0x1a, 0xe7, 0xe2, 0xf3, 0xf9, 0x14, 0x79, 0x94, 0xc0, 0xd3, 0x97, 0x43,
	0x08, 0x7b, 0xb3, 0x84, 0x43, 0x2f, 0x9d, 0x84, 0x3f, 0x21, 0x01, 0x9b, },
	{ 0xd3, 0xe3, 0x54, 0xb0, 0xf7, 0x1d, 0xf6, 0x2b, 0x5a, 0x43, 0x4d, 0x04,
	0x83, 0x64, 0x3e, 0x0d, 0x59, 0x2f, 0x61, 0xcb, 0xb1, 0x6a, 0x59, 0x0d, },
	{ 0xc8, 0xc1, 0xe9, 0xb8, 0x16, 0x56, 0x99, 0x21, 0x7b, 0x5b, 0x36, 0xb7,
	0xb5, 0x9b, 0xdf, 0x06, 0x49, 0x2c, 0x97, 0xf5, 0x95, 0x48, 0x85, 0x7e, },
	{ 0xeb, 0xe5, 0xe6, 0x2e, 0xa4, 0xba, 0xd4, 0x2c, 0xf2, 0x16, 0xe0, 0x8f,
	0x66, 0x23, 0xa9, 0x43, 0x41, 0xce, 0x38, 0x14, 0x84, 0x95, 0x00, 0x53, },
	{ 0x66, 0xdb, 0x90, 0xf0, 0x3b, 0x4f, 0xf5, 0x6f, 0xe4, 0x9c, 0x20, 0x89,
	0x35, 0x5e, 0xd2, 0xb2, 0xc3, 0x9e, 0x9f, 0x7f, 0x63, 0xb2, 0x28, 0x81, },
	{ 0xbb, 0x20, 0xac, 0xed, 0x2a, 0x04, 0x6a, 0x19, 0x94, 0x98, 0x9b, 0xc8,
	0xff, 0xcd, 0x93, 0xef, 0xc6, 0x0d, 0x56, 0xa7, 0xeb, 0x13, 0xd9, 0x30, },
	{ 0xbc, 0xf2, 0x43, 0x82, 0x09, 0x40, 0x8a, 0x87, 0x25, 0x43, 0x6d, 0xe6,
	0xbb, 0xa4, 0xb9, 0x44, 0x58, 0x3f, 0x21, 0x7c, 0x99, 0xbb, 0x3f, 0x24, },
	{ 0xec, 0x1a, 0xaa, 0xcd, 0xce, 0xbd, 0x53, 0x11, 0xd2, 0xfb, 0x83, 0xb6,
	0xc3, 0xba, 0xab, 0x4f, 0x62, 0x79, 0xe8, 0x65, 0xa9, 0x92, 0x28, 0x76, },
	{ 0xc6, 0x0c, 0x30, 0x03, 0x91, 0x18, 0x2d, 0x7b, 0x79, 0xda, 0xe1, 0xd5,
	0x64, 0x77, 0x9a, 0x12, 0xc5, 0xb1, 0xd7, 0x91, 0x4f, 0x96, 0x4c, 0xa3, },
	{ 0xd7, 0x7c, 0x2a, 0xbf, 0xa6, 0xe7, 0x85, 0x7c, 0x45, 0xad, 0xff, 0x12,
	0x94, 0xd8, 0xde, 0xa4, 0x5c, 0x3d, 0x79, 0xa4, 0x44, 0x02, 0x5d, 0x22, },
	{ 0x16, 0x19, 0x0d, 0x81, 0x6a, 0x4c, 0xc7, 0xf8, 0xb8, 0xf9, 0x4e, 0xcd,
	0x2c, 0x9e, 0x90, 0x84, 0xb2, 0x08, 0x25, 0x60, 0xe1, 0x1e, 0xae, 0x18, },
	{ 0xe9, 0x7c, 0x58, 0x26, 0x1b, 0x51, 0x9e, 0x49, 0x82, 0x60, 0x61, 0xfc,
	0xa0, 0xa0, 0x1b, 0xcd, 0xf5, 0x05, 0xd6, 0xa6, 0x6d, 0x07, 0x88, 0xa3, },
	{ 0x2b, 0x97, 0x11, 0x8b, 0xd9, 0x4e, 0xd9, 0xdf, 0x20, 0xe3, 0x9c, 0x10,
	0xe6, 0xa1, 0x35, 0x21, 0x11, 0xf9, 0x13, 0x0d, 0x0b, 0x24, 0x65, 0xb2, },
	{ 0x53, 0x6a, 0x4c, 0x54, 0xac, 0x8b, 0x9b, 0xb8, 0x97, 0x29, 0xfc, 0x60,
	0x2c, 0x5b, 0x3a, 0x85, 0x68, 0xb5, 0xaa, 0x6a, 0x44, 0xcd, 0x3f, 0xa7, },
	};

	int ff_rtmpe_gen_pub_key(URLContext h, uint8_t buf)
	{
	RTMPEContext *rt = h->priv_data;
	int offset, ret;

	if (!(rt->dh = ff_dh_init(1024)))
	return AVERROR(ENOMEM);

	offset = ff_rtmp_calc_digest_pos(buf, 768, 632, 8);
	if (offset < 0)
	return offset;

	/* generate a Diffie-Hellmann public key */
	if ((ret = ff_dh_generate_public_key(rt->dh)) < 0)
	return ret;

	/* write the public key into the handshake buffer */
	if ((ret = ff_dh_write_public_key(rt->dh, buf + offset, 128)) < 0)
	return ret;

	return 0;
	}

	int ff_rtmpe_compute_secret_key(URLContext h, const uint8_t serverdata,
	const uint8_t *clientdata, int type)
	{
	RTMPEContext *rt = h->priv_data;
	uint8_t secret_key[128], digest[32];
	int server_pos, client_pos;
	int ret;

	if (type) {
	if ((server_pos = ff_rtmp_calc_digest_pos(serverdata, 1532, 632, 772)) < 0)
	return server_pos;
	} else {
	if ((server_pos = ff_rtmp_calc_digest_pos(serverdata, 768, 632, 8)) < 0)
	return server_pos;
	}

	if ((client_pos = ff_rtmp_calc_digest_pos(clientdata, 768, 632, 8)) < 0)
	return client_pos;

	/* compute the shared secret secret in order to compute RC4 keys */
	if ((ret = ff_dh_compute_shared_secret_key(rt->dh, serverdata + server_pos,
	128, secret_key, sizeof(secret_key))) < 0)
	return ret;

	/* set output key */
	if ((ret = ff_rtmp_calc_digest(serverdata + server_pos, 128, 0, secret_key,
	128, digest)) < 0)
	return ret;
	av_rc4_init(&rt->key_out, digest, 16 * 8, 1);

	/* set input key */
	if ((ret = ff_rtmp_calc_digest(clientdata + client_pos, 128, 0, secret_key,
	128, digest)) < 0)
	return ret;
	av_rc4_init(&rt->key_in, digest, 16 * 8, 1);

	return 0;
	}

	static void rtmpe8_sig(const uint8_t in, uint8_t out, int key_id)
	{
	struct AVXTEA ctx;

	av_xtea_le_init(&ctx, rtmpe8_keys[key_id]);
	av_xtea_le_crypt(&ctx, out, in, 1, NULL, 0);
	}

	static void rtmpe9_sig(const uint8_t in, uint8_t out, int key_id)
	{
	struct AVBlowfish ctx;
	uint32_t xl, xr;

	xl = AV_RL32(in);
	xr = AV_RL32(in + 4);

	av_blowfish_init(&ctx, rtmpe9_keys[key_id], 24);
	av_blowfish_crypt_ecb(&ctx, &xl, &xr, 0);

	AV_WL32(out, xl);
	AV_WL32(out + 4, xr);
	}

	void ff_rtmpe_encrypt_sig(URLContext h, uint8_t sig, const uint8_t *digest,
	int type)
	{
	int i;

	for (i = 0; i < 32; i += 8) {
	if (type == 8) {
	/* RTMPE type 8 uses XTEA on the signature */
	rtmpe8_sig(sig + i, sig + i, digest[i] % 15);
	} else if (type == 9) {
	/* RTMPE type 9 uses Blowfish on the signature */
	rtmpe9_sig(sig + i, sig + i, digest[i] % 15);
	}
	}
	}

	int ff_rtmpe_update_keystream(URLContext *h)
	{
	RTMPEContext *rt = h->priv_data;
	char buf[RTMP_HANDSHAKE_PACKET_SIZE];

	/* skip past 1536 bytes of the RC4 bytestream */
	av_rc4_crypt(&rt->key_in, buf, NULL, sizeof(buf), NULL, 1);
	av_rc4_crypt(&rt->key_out, buf, NULL, sizeof(buf), NULL, 1);

	/* the next requests will be encrypted using RC4 keys */
	rt->handshaked = 1;

	return 0;
	}

	static int rtmpe_close(URLContext *h)
	{
	RTMPEContext *rt = h->priv_data;

	ff_dh_free(rt->dh);
	ffurl_close(rt->stream);

	return 0;
	}

	static int rtmpe_open(URLContext h, const char uri, int flags)
	{
	RTMPEContext *rt = h->priv_data;
	char host[256], url[1024];
	int ret, port;

	av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);

	if (rt->tunneling) {
	if (port < 0)
	port = 80;
	ff_url_join(url, sizeof(url), "ffrtmphttp", NULL, host, port, NULL);
	} else {
	if (port < 0)
	port = 1935;
	ff_url_join(url, sizeof(url), "tcp", NULL, host, port, NULL);
	}

	/* open the tcp or ffrtmphttp connection */
	if ((ret = ffurl_open_whitelist(&rt->stream, url, AVIO_FLAG_READ_WRITE,
	&h->interrupt_callback, NULL,
	h->protocol_whitelist, h->protocol_blacklist, h)) < 0) {
	rtmpe_close(h);
	return ret;
	}

	return 0;
	}

	static int rtmpe_read(URLContext h, uint8_t buf, int size)
	{
	RTMPEContext *rt = h->priv_data;
	int ret;

	rt->stream->flags \|= h->flags & AVIO_FLAG_NONBLOCK;
	ret = ffurl_read(rt->stream, buf, size);
	rt->stream->flags &= ~AVIO_FLAG_NONBLOCK;

	if (ret < 0 && ret != AVERROR_EOF)
	return ret;

	if (rt->handshaked && ret > 0) {
	/* decrypt data received by the server */
	av_rc4_crypt(&rt->key_in, buf, buf, ret, NULL, 1);
	}

	return ret;
	}

	static int rtmpe_write(URLContext h, const uint8_t buf, int size)
	{
	RTMPEContext *rt = h->priv_data;
	int ret;

	if (rt->handshaked) {
	/* encrypt data to send to the server */
	av_rc4_crypt(&rt->key_out, (uint8_t *)buf, buf, size, NULL, 1);
	}

	if ((ret = ffurl_write(rt->stream, buf, size)) < 0)
	return ret;

	return size;
	}

	#define OFFSET(x) offsetof(RTMPEContext, x)
	#define DEC AV_OPT_FLAG_DECODING_PARAM

	static const AVOption ffrtmpcrypt_options[] = {
	{"ffrtmpcrypt_tunneling", "Use a HTTP tunneling connection (RTMPTE).", OFFSET(tunneling), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC},
	{ NULL },
	};

	static const AVClass ffrtmpcrypt_class = {
	.class_name = "ffrtmpcrypt",
	.item_name = av_default_item_name,
	.option = ffrtmpcrypt_options,
	.version = LIBAVUTIL_VERSION_INT,
	};

	const URLProtocol ff_ffrtmpcrypt_protocol = {
	.name = "ffrtmpcrypt",
	.url_open = rtmpe_open,
	.url_read = rtmpe_read,
	.url_write = rtmpe_write,
	.url_close = rtmpe_close,
	.priv_data_size = sizeof(RTMPEContext),
	.flags = URL_PROTOCOL_FLAG_NETWORK,
	.priv_data_class = &ffrtmpcrypt_class,
	};