1 files changed, 0 insertions, 172 deletions
diff --git a/contrib/ffmpeg/libavformat/asfcrypt.c b/contrib/ffmpeg/libavformat/asfcrypt.c
deleted file mode 100644
index 10cc934b4..000000000
--- a/contrib/ffmpeg/libavformat/asfcrypt.c
+++ /dev/null
@@ -1,172 +0,0 @@
-/*
- * ASF decryption
- * Copyright (c) 2007 Reimar Doeffinger
- * This is a rewrite of code contained in freeme/freeme2
- *
- * 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
- */
-#include "common.h"
-#include "intreadwrite.h"
-#include "bswap.h"
-#include "des.h"
-#include "rc4.h"
-#include "asfcrypt.h"
-
-/**
- * \brief find multiplicative inverse modulo 2 ^ 32
- * \param v number to invert, must be odd!
- * \return number so that result * v = 1 (mod 2^32)
- */
-static uint32_t inverse(uint32_t v) {
-    // v ^ 3 gives the inverse (mod 16), could also be implemented
-    // as table etc. (only lowest 4 bits matter!)
-    uint32_t inverse = v * v * v;
-    // uses a fixpoint-iteration that doubles the number
-    // of correct lowest bits each time
-    inverse *= 2 - v * inverse;
-    inverse *= 2 - v * inverse;
-    inverse *= 2 - v * inverse;
-    return inverse;
-}
-
-/**
- * \brief read keys from keybuf into keys
- * \param keybuf buffer containing the keys
- * \param keys output key array containing the keys for encryption in
- *             native endianness
- */
-static void multiswap_init(const uint8_t keybuf[48], uint32_t keys[12]) {
-    int i;
-    for (i = 0; i < 12; i++)
-        keys[i] = AV_RL32(keybuf + (i << 2)) | 1;
-}
-
-/**
- * \brief invert the keys so that encryption become decryption keys and
- *        the other way round.
- * \param keys key array of ints to invert
- */
-static void multiswap_invert_keys(uint32_t keys[12]) {
-    int i;
-    for (i = 0; i < 5; i++)
-        keys[i] = inverse(keys[i]);
-    for (i = 6; i < 11; i++)
-        keys[i] = inverse(keys[i]);
-}
-
-static uint32_t multiswap_step(const uint32_t keys[12], uint32_t v) {
-    int i;
-    v *= keys[0];
-    for (i = 1; i < 5; i++) {
-        v = (v >> 16) | (v << 16);
-        v *= keys[i];
-    }
-    v += keys[5];
-    return v;
-}
-
-static uint32_t multiswap_inv_step(const uint32_t keys[12], uint32_t v) {
-    int i;
-    v -= keys[5];
-    for (i = 4; i > 0; i--) {
-        v *= keys[i];
-        v = (v >> 16) | (v << 16);
-    }
-    v *= keys[0];
-    return v;
-}
-
-/**
- * \brief "MultiSwap" encryption
- * \param keys 32 bit numbers in machine endianness,
- *             0-4 and 6-10 must be inverted from decryption
- * \param key another key, this one must be the same for the decryption
- * \param data data to encrypt
- * \return encrypted data
- */
-static uint64_t multiswap_enc(const uint32_t keys[12], uint64_t key, uint64_t data) {
-    uint32_t a = data;
-    uint32_t b = data >> 32;
-    uint32_t c;
-    uint32_t tmp;
-    a += key;
-    tmp = multiswap_step(keys    , a);
-    b += tmp;
-    c = (key >> 32) + tmp;
-    tmp = multiswap_step(keys + 6, b);
-    c += tmp;
-    return ((uint64_t)c << 32) | tmp;
-}
-
-/**
- * \brief "MultiSwap" decryption
- * \param keys 32 bit numbers in machine endianness,
- *             0-4 and 6-10 must be inverted from encryption
- * \param key another key, this one must be the same as for the encryption
- * \param data data to decrypt
- * \return decrypted data
- */
-static uint64_t multiswap_dec(const uint32_t keys[12], uint64_t key, uint64_t data) {
-    uint32_t a;
-    uint32_t b;
-    uint32_t c = data >> 32;
-    uint32_t tmp = data;
-    c -= tmp;
-    b = multiswap_inv_step(keys + 6, tmp);
-    tmp = c - (key >> 32);
-    b -= tmp;
-    a = multiswap_inv_step(keys    , tmp);
-    a -= key;
-    return ((uint64_t)b << 32) | a;
-}
-
-void ff_asfcrypt_dec(const uint8_t key[20], uint8_t *data, int len) {
-    int num_qwords = len >> 3;
-    uint64_t *qwords = (uint64_t *)data;
-    uint64_t rc4buff[8];
-    uint64_t packetkey;
-    uint32_t ms_keys[12];
-    uint64_t ms_state;
-    int i;
-    if (len < 16) {
-        for (i = 0; i < len; i++)
-            data[i] ^= key[i];
-        return;
-    }
-
-    memset(rc4buff, 0, sizeof(rc4buff));
-    ff_rc4_enc(key, 12, (uint8_t *)rc4buff, sizeof(rc4buff));
-    multiswap_init((uint8_t *)rc4buff, ms_keys);
-
-    packetkey = qwords[num_qwords - 1];
-    packetkey ^= rc4buff[7];
-    packetkey = be2me_64(packetkey);
-    packetkey = ff_des_encdec(packetkey, AV_RB64(key + 12), 1);
-    packetkey = be2me_64(packetkey);
-    packetkey ^= rc4buff[6];
-
-    ff_rc4_enc((uint8_t *)&packetkey, 8, data, len);
-
-    ms_state = 0;
-    for (i = 0; i < num_qwords - 1; i++, qwords++)
-        ms_state = multiswap_enc(ms_keys, ms_state, AV_RL64(qwords));
-    multiswap_invert_keys(ms_keys);
-    packetkey = (packetkey << 32) | (packetkey >> 32);
-    packetkey = le2me_64(packetkey);
-    packetkey = multiswap_dec(ms_keys, ms_state, packetkey);
-    AV_WL64(qwords, packetkey);
-}