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Viewing changes to libavformat/asfcrypt.c

  • Committer: Bazaar Package Importer
  • Author(s): Reinhard Tartler
  • Date: 2009-02-05 21:45:05 UTC
  • mfrom: (1.1.7 upstream)
  • Revision ID: james.westby@ubuntu.com-20090205214505-fvn0jkiv3lrkaaq4
Tags: 3:0.svn20090204-2ubuntu1+unstripped1
rebuild using a clean, uncrippled ffmpeg tarball

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Lines of Context:
libavformat/asfcrypt.c
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}
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void ff_asfcrypt_dec(const uint8_t key[20], uint8_t *data, int len) {
 
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    struct AVDES des;
 
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    struct AVRC4 rc4;
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    int num_qwords = len >> 3;
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    uint64_t *qwords = (uint64_t *)data;
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    uint64_t rc4buff[8];
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    }
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    memset(rc4buff, 0, sizeof(rc4buff));
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    ff_rc4_enc(key, 12, (uint8_t *)rc4buff, sizeof(rc4buff));
 
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    av_rc4_init(&rc4, key, 12 * 8, 1);
 
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    av_rc4_crypt(&rc4, (uint8_t *)rc4buff, NULL, sizeof(rc4buff), NULL, 1);
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    multiswap_init((uint8_t *)rc4buff, ms_keys);
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    packetkey = qwords[num_qwords - 1];
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    packetkey ^= rc4buff[7];
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    packetkey = be2me_64(packetkey);
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    packetkey = ff_des_encdec(packetkey, AV_RB64(key + 12), 1);
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    packetkey = be2me_64(packetkey);
 
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    av_des_init(&des, key + 12, 64, 1);
 
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    av_des_crypt(&des, (uint8_t *)&packetkey, (uint8_t *)&packetkey, 1, NULL, 1);
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    packetkey ^= rc4buff[6];
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    ff_rc4_enc((uint8_t *)&packetkey, 8, data, len);
 
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    av_rc4_init(&rc4, (uint8_t *)&packetkey, 64, 1);
 
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    av_rc4_crypt(&rc4, data, data, len, NULL, 1);
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    ms_state = 0;
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    for (i = 0; i < num_qwords - 1; i++, qwords++)