@@ -39,6 +39,7 @@ version <next>:

 - RTMPTS protocol support

 - JPEG 2000 encoding support through OpenJPEG

 - G.723.1 demuxer and decoder

+- RTMPE protocol support

 version 0.8:

@@ -950,6 +950,7 @@ CONFIG_LIST="

     fastdiv

     fft

     frei0r

+    gcrypt

     gnutls

     gpl

     gray

@@ -982,6 +983,7 @@ CONFIG_LIST="

     mdct

     memalign_hack

     mpegaudiodsp

+    nettle

     network

     nonfree

     openssl

@@ -1543,6 +1545,9 @@ vfwcap_indev_extralibs="-lavicap32"

 x11_grab_device_indev_deps="x11grab XShmCreateImage"

 # protocols

+ffrtmpcrypt_protocol_deps="!librtmp_protocol"

+ffrtmpcrypt_protocol_deps_any="gcrypt nettle openssl"

+ffrtmpcrypt_protocol_select="tcp_protocol"

 ffrtmphttp_protocol_deps="!librtmp_protocol"

 ffrtmphttp_protocol_select="http_protocol"

 gopher_protocol_deps="network"

@@ -1560,6 +1565,7 @@ mmsh_protocol_select="http_protocol"

 mmst_protocol_deps="network"

 rtmp_protocol_deps="!librtmp_protocol"

 rtmp_protocol_select="tcp_protocol"

+rtmpe_protocol_select="ffrtmpcrypt_protocol"

 rtmps_protocol_deps="!librtmp_protocol"

 rtmps_protocol_select="tls_protocol"

 rtmpt_protocol_select="ffrtmphttp_protocol"

@@ -3014,6 +3020,11 @@ enabled openssl    && { check_lib openssl/ssl.h SSL_library_init -lssl -lcrypto

                         check_lib openssl/ssl.h SSL_library_init -lssl -lcrypto -lws2_32 -lgdi32 ||

                         die "ERROR: openssl not found"; }

+if enabled gnutls; then

+    { check_lib nettle/bignum.h nettle_mpz_get_str_256 -lnettle -lhogweed -lgmp && enable nettle; } ||

+    { check_lib gcrypt.h gcry_mpi_new -lgcrypt && enable gcrypt; }

+fi

+

 # libdc1394 check

 if enabled libdc1394; then

     { check_lib dc1394/dc1394.h dc1394_new -ldc1394 -lraw1394 &&

@@ -844,7 +844,7 @@ performance on systems without hardware floating point support).

 @item MMST         @tab X

 @item pipe         @tab X

 @item RTMP         @tab X

-@item RTMPE        @tab E

+@item RTMPE        @tab X

 @item RTMPS        @tab X

 @item RTMPT        @tab X

 @item RTMPTE       @tab E

@@ -247,6 +247,15 @@ For example to read with @command{avplay} a multimedia resource named

 avplay rtmp://myserver/vod/sample

 @end example

+@section rtmpe

+

+Encrypted Real-Time Messaging Protocol.

+

+The Encrypted Real-Time Messaging Protocol (RTMPE) is used for

+streaming multimedia content within standard cryptographic primitives,

+consisting of Diffie-Hellman key exchange and HMACSHA256, generating

+a pair of RC4 keys.

+

 @section rtmps

 Real-Time Messaging Protocol over a secure SSL connection.

@@ -341,6 +341,7 @@ OBJS-$(CONFIG_LIBRTMP)                   += librtmp.o

 OBJS-$(CONFIG_APPLEHTTP_PROTOCOL)        += hlsproto.o

 OBJS-$(CONFIG_CONCAT_PROTOCOL)           += concat.o

 OBJS-$(CONFIG_CRYPTO_PROTOCOL)           += crypto.o

+OBJS-$(CONFIG_FFRTMPCRYPT_PROTOCOL)      += rtmpcrypt.o rtmpdh.o

 OBJS-$(CONFIG_FFRTMPHTTP_PROTOCOL)       += rtmphttp.o

 OBJS-$(CONFIG_FILE_PROTOCOL)             += file.o

 OBJS-$(CONFIG_GOPHER_PROTOCOL)           += gopher.o

@@ -353,6 +354,7 @@ OBJS-$(CONFIG_MMST_PROTOCOL)             += mmst.o mms.o asf.o

 OBJS-$(CONFIG_MD5_PROTOCOL)              += md5proto.o

 OBJS-$(CONFIG_PIPE_PROTOCOL)             += file.o

 OBJS-$(CONFIG_RTMP_PROTOCOL)             += rtmpproto.o rtmppkt.o

+OBJS-$(CONFIG_RTMPE_PROTOCOL)            += rtmpproto.o rtmppkt.o

 OBJS-$(CONFIG_RTMPS_PROTOCOL)            += rtmpproto.o rtmppkt.o

 OBJS-$(CONFIG_RTMPT_PROTOCOL)            += rtmpproto.o rtmppkt.o

 OBJS-$(CONFIG_RTMPTS_PROTOCOL)           += rtmpproto.o rtmppkt.o

@@ -247,6 +247,7 @@ void av_register_all(void)

 #endif

     REGISTER_PROTOCOL (CONCAT, concat);

     REGISTER_PROTOCOL (CRYPTO, crypto);

+    REGISTER_PROTOCOL (FFRTMPCRYPT, ffrtmpcrypt);

     REGISTER_PROTOCOL (FFRTMPHTTP, ffrtmphttp);

     REGISTER_PROTOCOL (FILE, file);

     REGISTER_PROTOCOL (GOPHER, gopher);

@@ -259,6 +260,7 @@ void av_register_all(void)

     REGISTER_PROTOCOL (MD5,  md5);

     REGISTER_PROTOCOL (PIPE, pipe);

     REGISTER_PROTOCOL (RTMP, rtmp);

+    REGISTER_PROTOCOL (RTMPE, rtmpe);

     REGISTER_PROTOCOL (RTMPS, rtmps);

     REGISTER_PROTOCOL (RTMPT, rtmpt);

     REGISTER_PROTOCOL (RTMPTS, rtmpts);

new file mode 100644

@@ -0,0 +1,309 @@

+/*

+ * RTMPE network protocol

+ * Copyright (c) 2012 Samuel Pitoiset

+ *

+ * This file is part of Libav.

+ *

+ * Libav 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.

+ *

+ * Libav 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 Libav; 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/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 {

+    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

+} RTMPEContext;

+

+static const uint8_t rtmpe8_keys[16][16] = {

+    { 0xbf, 0xf0, 0x34, 0xb2, 0x11, 0xd9, 0x08, 0x1f,

+      0xcc, 0xdf, 0xb7, 0x95, 0x74, 0x8d, 0xe7, 0x32 },

+    { 0x08, 0x6a, 0x5e, 0xb6, 0x17, 0x43, 0x09, 0x0e,

+      0x6e, 0xf0, 0x5a, 0xb8, 0xfe, 0x5a, 0x39, 0xe2 },

+    { 0x7b, 0x10, 0x95, 0x6f, 0x76, 0xce, 0x05, 0x21,

+      0x23, 0x88, 0xa7, 0x3a, 0x44, 0x01, 0x49, 0xa1 },

+    { 0xa9, 0x43, 0xf3, 0x17, 0xeb, 0xf1, 0x1b, 0xb2,

+      0xa6, 0x91, 0xa5, 0xee, 0x17, 0xf3, 0x63, 0x39 },

+    { 0x7a, 0x30, 0xe0, 0x0a, 0xb5, 0x29, 0xe2, 0x2c,

+      0xa0, 0x87, 0xae, 0xa5, 0xc0, 0xcb, 0x79, 0xac },

+    { 0xbd, 0xce, 0x0c, 0x23, 0x2f, 0xeb, 0xde, 0xff,

+      0x1c, 0xfa, 0xae, 0x16, 0x11, 0x23, 0x23, 0x9d },

+    { 0x55, 0xdd, 0x3f, 0x7b, 0x77, 0xe7, 0xe6, 0x2e,

+      0x9b, 0xb8, 0xc4, 0x99, 0xc9, 0x48, 0x1e, 0xe4 },

+    { 0x40, 0x7b, 0xb6, 0xb4, 0x71, 0xe8, 0x91, 0x36,

+      0xa7, 0xae, 0xbf, 0x55, 0xca, 0x33, 0xb8, 0x39 },

+    { 0xfc, 0xf6, 0xbd, 0xc3, 0xb6, 0x3c, 0x36, 0x97,

+      0x7c, 0xe4, 0xf8, 0x25, 0x04, 0xd9, 0x59, 0xb2 },

+    { 0x28, 0xe0, 0x91, 0xfd, 0x41, 0x95, 0x4c, 0x4c,

+      0x7f, 0xb7, 0xdb, 0x00, 0xe3, 0xa0, 0x66, 0xf8 },

+    { 0x57, 0x84, 0x5b, 0x76, 0x4f, 0x25, 0x1b, 0x03,

+      0x46, 0xd4, 0x5b, 0xcd, 0xa2, 0xc3, 0x0d, 0x29 },

+    { 0x0a, 0xcc, 0xee, 0xf8, 0xda, 0x55, 0xb5, 0x46,

+      0x03, 0x47, 0x34, 0x52, 0x58, 0x63, 0x71, 0x3b },

+    { 0xb8, 0x20, 0x75, 0xdc, 0xa7, 0x5f, 0x1f, 0xee,

+      0xd8, 0x42, 0x68, 0xe8, 0xa7, 0x2a, 0x44, 0xcc },

+    { 0x07, 0xcf, 0x6e, 0x9e, 0xa1, 0x6d, 0x7b, 0x25,

+      0x9f, 0xa7, 0xae, 0x6c, 0xd9, 0x2f, 0x56, 0x29 },

+    { 0xfe, 0xb1, 0xea, 0xe4, 0x8c, 0x8c, 0x3c, 0xe1,

+      0x4e, 0x00, 0x64, 0xa7, 0x6a, 0x38, 0x7c, 0x2a },

+    { 0x89, 0x3a, 0x94, 0x27, 0xcc, 0x30, 0x13, 0xa2,

+      0xf1, 0x06, 0x38, 0x5b, 0xa8, 0x29, 0xf9, 0x27 }

+};

+

+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)) < 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_init(&ctx, rtmpe8_keys[key_id]);

+    av_xtea_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 (port < 0)

+        port = 1935;

+

+    /* open the tcp connection */

+    ff_url_join(url, sizeof(url), "tcp", NULL, host, port, NULL);

+    if ((ret = ffurl_open(&rt->stream, url, AVIO_FLAG_READ_WRITE,

+                          &h->interrupt_callback, NULL)) < 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, buf, buf, size, NULL, 1);

+    }

+

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

+        return ret;

+

+    return size;

+}

+

+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,

+};

new file mode 100644

@@ -0,0 +1,69 @@

+/*

+ * RTMPE encryption utilities

+ * Copyright (c) 2012 Samuel Pitoiset

+ *

+ * This file is part of Libav.

+ *

+ * Libav 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.

+ *

+ * Libav 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 Libav; if not, write to the Free Software

+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

+ */

+

+#ifndef AVFORMAT_RTMPCRYPT_H

+#define AVFORMAT_RTMPCRYPT_H

+

+#include <stdint.h>

+

+#include "url.h"

+

+/**

+ * Initialize the Diffie-Hellmann context and generate the public key.

+ *

+ * @param h     an URLContext

+ * @param buf   handshake data (1536 bytes)

+ * @return zero on success, negative value otherwise

+ */

+int ff_rtmpe_gen_pub_key(URLContext *h, uint8_t *buf);

+

+/**

+ * Compute the shared secret key and initialize the RC4 encryption.

+ *

+ * @param h             an URLContext

+ * @param serverdata    server data (1536 bytes)

+ * @param clientdata    client data (1536 bytes)

+ * @param type          the position of the server digest

+ * @return zero on success, negative value otherwise

+ */

+int ff_rtmpe_compute_secret_key(URLContext *h, const uint8_t *serverdata,

+                                const uint8_t *clientdata, int type);

+

+/**

+ * Encrypt the signature.

+ *

+ * @param h             an URLContext

+ * @param signature     the signature to encrypt

+ * @param digest        the digest used for finding the encryption key

+ * @param type          type of encryption (8 for XTEA, 9 for Blowfish)

+ */

+void ff_rtmpe_encrypt_sig(URLContext *h, uint8_t *signature,

+                          const uint8_t *digest, int type);

+

+/**

+ * Update the keystream and set RC4 keys for encryption.

+ *

+ * @param h an URLContext

+ * @return zero on success, negative value otherwise

+ */

+int ff_rtmpe_update_keystream(URLContext *h);

+

+#endif /* AVFORMAT_RTMPCRYPT_H */

new file mode 100644

@@ -0,0 +1,329 @@

+/*

+ * RTMP Diffie-Hellmann utilities

+ * Copyright (c) 2012 Samuel Pitoiset

+ *

+ * This file is part of Libav.

+ *

+ * Libav 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.

+ *

+ * Libav 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 Libav; if not, write to the Free Software

+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

+ */

+

+/**

+ * @file

+ * RTMP Diffie-Hellmann utilities

+ */

+

+#include "config.h"

+#include "rtmpdh.h"

+

+#define P1024                                          \

+    "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \

+    "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \

+    "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \

+    "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \

+    "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381" \

+    "FFFFFFFFFFFFFFFF"

+

+#define Q1024                                          \

+    "7FFFFFFFFFFFFFFFE487ED5110B4611A62633145C06E0E68" \

+    "948127044533E63A0105DF531D89CD9128A5043CC71A026E" \

+    "F7CA8CD9E69D218D98158536F92F8A1BA7F09AB6B6A8E122" \

+    "F242DABB312F3F637A262174D31BF6B585FFAE5B7A035BF6" \

+    "F71C35FDAD44CFD2D74F9208BE258FF324943328F67329C0" \

+    "FFFFFFFFFFFFFFFF"

+

+#if CONFIG_NETTLE || CONFIG_GCRYPT

+#if CONFIG_NETTLE

+#define bn_new(bn)                      \

+    do {                                \

+        bn = av_malloc(sizeof(*bn));    \

+        if (bn)                         \

+            mpz_init2(bn, 1);           \

+    } while (0)

+#define bn_free(bn)     \

+    do {                \

+        mpz_clear(bn);  \

+        av_free(bn);    \

+    } while (0)

+#define bn_set_word(bn, w)          mpz_set_ui(bn, w)

+#define bn_cmp(a, b)                mpz_cmp(a, b)

+#define bn_copy(to, from)           mpz_set(to, from)

+#define bn_sub_word(bn, w)          mpz_sub_ui(bn, bn, w)

+#define bn_cmp_1(bn)                mpz_cmp_ui(bn, 1)

+#define bn_num_bytes(bn)            (mpz_sizeinbase(bn, 2) + 7) / 8

+#define bn_bn2bin(bn, buf, len)     nettle_mpz_get_str_256(len, buf, bn)

+#define bn_bin2bn(bn, buf, len)                     \

+    do {                                            \

+        bn_new(bn);                                 \

+        if (bn)                                     \

+            nettle_mpz_set_str_256_u(bn, len, buf); \

+    } while (0)

+#define bn_hex2bn(bn, buf, ret)                     \

+    do {                                            \

+        bn_new(bn);                                 \

+        if (bn)                                     \

+            ret = (mpz_set_str(bn, buf, 16) == 0);  \

+    } while (0)

+#define bn_modexp(bn, y, q, p)      mpz_powm(bn, y, q, p)

+#define bn_random(bn, num_bytes)    mpz_random(bn, num_bytes);

+#elif CONFIG_GCRYPT

+#define bn_new(bn)                  bn = gcry_mpi_new(1)

+#define bn_free(bn)                 gcry_mpi_release(bn)

+#define bn_set_word(bn, w)          gcry_mpi_set_ui(bn, w)

+#define bn_cmp(a, b)                gcry_mpi_cmp(a, b)

+#define bn_copy(to, from)           gcry_mpi_set(to, from)

+#define bn_sub_word(bn, w)          gcry_mpi_sub_ui(bn, bn, w)

+#define bn_cmp_1(bn)                gcry_mpi_cmp_ui(bn, 1)

+#define bn_num_bytes(bn)            (gcry_mpi_get_nbits(bn) + 7) / 8

+#define bn_bn2bin(bn, buf, len)     gcry_mpi_print(GCRYMPI_FMT_USG, buf, len, NULL, bn)

+#define bn_bin2bn(bn, buf, len)     gcry_mpi_scan(&bn, GCRYMPI_FMT_USG, buf, len, NULL)

+#define bn_hex2bn(bn, buf, ret)     ret = (gcry_mpi_scan(&bn, GCRYMPI_FMT_HEX, buf, 0, 0) == 0)

+#define bn_modexp(bn, y, q, p)      gcry_mpi_powm(bn, y, q, p)

+#define bn_random(bn, num_bytes)    gcry_mpi_randomize(bn, num_bytes, GCRY_WEAK_RANDOM)

+#endif

+

+#define MAX_BYTES 18000

+

+#define dh_new()                    av_malloc(sizeof(FF_DH))

+

+static FFBigNum dh_generate_key(FF_DH *dh)

+{

+    int num_bytes;

+

+    num_bytes = bn_num_bytes(dh->p) - 1;

+    if (num_bytes <= 0 || num_bytes > MAX_BYTES)

+        return NULL;

+

+    bn_new(dh->priv_key);

+    if (!dh->priv_key)

+        return NULL;

+    bn_random(dh->priv_key, num_bytes);

+

+    bn_new(dh->pub_key);

+    if (!dh->pub_key) {

+        bn_free(dh->priv_key);

+        return NULL;

+    }

+

+    bn_modexp(dh->pub_key, dh->g, dh->priv_key, dh->p);

+

+    return dh->pub_key;

+}

+

+static int dh_compute_key(FF_DH *dh, FFBigNum pub_key_bn,

+                          uint32_t pub_key_len, uint8_t *secret_key)

+{

+    FFBigNum k;

+    int num_bytes;

+

+    num_bytes = bn_num_bytes(dh->p);

+    if (num_bytes <= 0 || num_bytes > MAX_BYTES)

+        return -1;

+

+    bn_new(k);

+    if (!k)

+        return -1;

+

+    bn_modexp(k, pub_key_bn, dh->priv_key, dh->p);

+    bn_bn2bin(k, secret_key, pub_key_len);

+    bn_free(k);

+

+    /* return the length of the shared secret key like DH_compute_key */

+    return pub_key_len;

+}

+

+void ff_dh_free(FF_DH *dh)

+{

+    bn_free(dh->p);

+    bn_free(dh->g);

+    bn_free(dh->pub_key);

+    bn_free(dh->priv_key);

+    av_free(dh);

+}

+#elif CONFIG_OPENSSL

+#define bn_new(bn)                  bn = BN_new()

+#define bn_free(bn)                 BN_free(bn)

+#define bn_set_word(bn, w)          BN_set_word(bn, w)

+#define bn_cmp(a, b)                BN_cmp(a, b)

+#define bn_copy(to, from)           BN_copy(to, from)

+#define bn_sub_word(bn, w)          BN_sub_word(bn, w)

+#define bn_cmp_1(bn)                BN_cmp(bn, BN_value_one())

+#define bn_num_bytes(bn)            BN_num_bytes(bn)

+#define bn_bn2bin(bn, buf, len)     BN_bn2bin(bn, buf)

+#define bn_bin2bn(bn, buf, len)     bn = BN_bin2bn(buf, len, 0)

+#define bn_hex2bn(bn, buf, ret)     ret = BN_hex2bn(&bn, buf)

+#define bn_modexp(bn, y, q, p)               \

+    do {                                     \

+        BN_CTX *ctx = BN_CTX_new();          \

+        if (!ctx)                            \

+            return AVERROR(ENOMEM);          \

+        if (!BN_mod_exp(bn, y, q, p, ctx)) { \

+            BN_CTX_free(ctx);                \

+            return AVERROR(EINVAL);          \

+        }                                    \

+        BN_CTX_free(ctx);                    \

+    } while (0)

+

+#define dh_new()                                DH_new()

+#define dh_generate_key(dh)                     DH_generate_key(dh)

+#define dh_compute_key(dh, pub, len, secret)    DH_compute_key(secret, pub, dh)

+

+void ff_dh_free(FF_DH *dh)

+{

+    DH_free(dh);

+}

+#endif

+

+static int dh_is_valid_public_key(FFBigNum y, FFBigNum p, FFBigNum q)

+{

+    FFBigNum bn = NULL;

+    int ret = AVERROR(EINVAL);

+

+    bn_new(bn);

+    if (!bn)

+        return AVERROR(ENOMEM);

+

+    /* y must lie in [2, p - 1] */

+    bn_set_word(bn, 1);

+    if (!bn_cmp(y, bn))

+        goto fail;

+

+    /* bn = p - 2 */

+    bn_copy(bn, p);

+    bn_sub_word(bn, 1);

+    if (!bn_cmp(y, bn))

+        goto fail;

+

+    /* Verify with Sophie-Germain prime

+     *

+     * This is a nice test to make sure the public key position is calculated

+     * correctly. This test will fail in about 50% of the cases if applied to

+     * random data.

+     */

+    /* y must fulfill y^q mod p = 1 */

+    bn_modexp(bn, y, q, p);

+

+    if (bn_cmp_1(bn))

+        goto fail;

+

+    ret = 0;

+fail:

+    bn_free(bn);

+

+    return ret;

+}

+

+av_cold FF_DH *ff_dh_init(int key_len)

+{

+    FF_DH *dh;

+    int ret;

+

+    if (!(dh = dh_new()))

+        return NULL;

+

+    bn_new(dh->g);

+    if (!dh->g)

+        goto fail;

+

+    bn_hex2bn(dh->p, P1024, ret);

+    if (!ret)

+        goto fail;

+

+    bn_set_word(dh->g, 2);

+    dh->length = key_len;

+

+    return dh;

+

+fail:

+    ff_dh_free(dh);

+

+    return NULL;

+}

+

+int ff_dh_generate_public_key(FF_DH *dh)

+{

+    int ret = 0;

+

+    while (!ret) {

+        FFBigNum q1 = NULL;

+

+        if (!dh_generate_key(dh))

+            return AVERROR(EINVAL);

+

+        bn_hex2bn(q1, Q1024, ret);

+        if (!ret)

+            return AVERROR(ENOMEM);

+

+        ret = dh_is_valid_public_key(dh->pub_key, dh->p, q1);

+        bn_free(q1);

+

+        if (!ret) {

+            /* the public key is valid */

+            break;

+        }

+    }

+

+    return ret;

+}

+

+int ff_dh_write_public_key(FF_DH *dh, uint8_t *pub_key, int pub_key_len)

+{

+    int len;

+

+    /* compute the length of the public key */

+    len = bn_num_bytes(dh->pub_key);

+    if (len <= 0 || len > pub_key_len)

+        return AVERROR(EINVAL);

+

+    /* convert the public key value into big-endian form */

+    memset(pub_key, 0, pub_key_len);

+    bn_bn2bin(dh->pub_key, pub_key + pub_key_len - len, len);

+

+    return 0;

+}

+

+int ff_dh_compute_shared_secret_key(FF_DH *dh, const uint8_t *pub_key,

+                                    int pub_key_len, uint8_t *secret_key)

+{

+    FFBigNum q1 = NULL, pub_key_bn = NULL;

+    int ret;

+

+    /* convert the big-endian form of the public key into a bignum */

+    bn_bin2bn(pub_key_bn, pub_key, pub_key_len);

+    if (!pub_key_bn)

+        return AVERROR(ENOMEM);

+

+    /* convert the string containing a hexadecimal number into a bignum */

+    bn_hex2bn(q1, Q1024, ret);

+    if (!ret) {

+        ret = AVERROR(ENOMEM);

+        goto fail;

+    }

+

+    /* when the public key is valid we have to compute the shared secret key */

+    if ((ret = dh_is_valid_public_key(pub_key_bn, dh->p, q1)) < 0) {

+        goto fail;

+    } else if ((ret = dh_compute_key(dh, pub_key_bn, pub_key_len,

+                                     secret_key)) < 0) {

+        ret = AVERROR(EINVAL);

+        goto fail;

+    }

+

+fail:

+    bn_free(pub_key_bn);

+    bn_free(q1);

+

+    return ret;

+}

+

new file mode 100644

@@ -0,0 +1,102 @@

+/*

+ * RTMP Diffie-Hellmann utilities

+ * Copyright (c) 2012 Samuel Pitoiset

+ *

+ * This file is part of Libav.

+ *

+ * Libav 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.

+ *

+ * Libav 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 Libav; if not, write to the Free Software

+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

+ */

+

+#ifndef AVFORMAT_RTMPDH_H

+#define AVFORMAT_RTMPDH_H

+

+#include "avformat.h"

+#include "config.h"

+

+#if CONFIG_NETTLE || CONFIG_GCRYPT

+#if CONFIG_NETTLE

+#include <gmp.h>

+#include <nettle/bignum.h>

+

+typedef mpz_ptr FFBigNum;

+#elif CONFIG_GCRYPT

+#include <gcrypt.h>

+

+typedef gcry_mpi_t FFBigNum;

+#endif

+

+typedef struct FF_DH {

+  FFBigNum p;

+  FFBigNum g;

+  FFBigNum pub_key;

+  FFBigNum priv_key;