atracdownload-wiki
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atracdownload-wiki [2010/06/10 08:40] – Explain Commit authorization value megadiscman | atracdownload-wiki [2011/08/10 22:04] (current) – alex | ||
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- | ==== 1. UNKNOWN PURPOSE | + | ==== 1. DISABLE TRACK PROTECTION FOR NEXT SESSION |
=> 00 18 00 08 00 46 f0 03 01 03 2b ff 00 01 00 00 01 | => 00 18 00 08 00 46 f0 03 01 03 2b ff 00 01 00 00 01 | ||
<= 09 18 00 08 00 46 f0 03 01 03 2b 00 00 01 00 00 01 | <= 09 18 00 08 00 46 f0 03 01 03 2b 00 00 01 00 00 01 | ||
+ | This instruction tells the MD unit to not set the " | ||
==== 2. START AUTHENTICATED SESSION ==== | ==== 2. START AUTHENTICATED SESSION ==== | ||
- | => 00 18 00 08 00 46 f0 03 01 03 80 ff 00 00 00 00 00 | + | => 00 18 00 08 00 46 f0 03 01 03 80 ff |
- | <= 09 18 00 08 00 46 f0 03 01 03 80 00 00 00 00 00 00 | + | <= 09 18 00 08 00 46 f0 03 01 03 80 00 |
NOTE: You hear head movement (disc spinning up). | NOTE: You hear head movement (disc spinning up). | ||
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==== 3. REQUEST FOR LEAF ID ==== | ==== 3. REQUEST FOR LEAF ID ==== | ||
- | => 00 18 00 08 00 46 f0 03 01 03 11 ff 00 00 00 00 00 | + | => 00 18 00 08 00 46 f0 03 01 03 11 ff |
<= 09 18 00 08 00 46 f0 03 01 03 11 00 01 00 00 21 cf 06 00 00 | <= 09 18 00 08 00 46 f0 03 01 03 11 00 01 00 00 21 cf 06 00 00 | ||
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$m(1) ... $m(8) | $m(1) ... $m(8) | ||
<= 09 18 00 08 00 46 f0 03 01 03 20 00 00 00 00 | <= 09 18 00 08 00 46 f0 03 01 03 20 00 00 00 00 | ||
- | !m(1) ... !m(1) | + | !m(1) ... !m(8) |
$m is a nonce from the host and !m is a nonce from the device. These two 8-byte-values are concatenated to form a 16-byte value. The Retail MAC without padding of that value, using the root key of the EKB transferred as key for the MAC will be the session key. | $m is a nonce from the host and !m is a nonce from the device. These two 8-byte-values are concatenated to form a 16-byte value. The Retail MAC without padding of that value, using the root key of the EKB transferred as key for the MAC will be the session key. | ||
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<= 09 18 00 08 00 46 f0 03 01 03 28 ff 00 01 | <= 09 18 00 08 00 46 f0 03 01 03 28 ff 00 01 | ||
00 10 01 00 !t 00 $p $q 00 00 $r $s $t $u $v $w | 00 10 01 00 !t 00 $p $q 00 00 $r $s $t $u $v $w | ||
+ | $m(0) ... $m(32) | ||
The track number of the recorded track is returned in !t. | The track number of the recorded track is returned in !t. | ||
+ | |||
+ | $m(x) is DES CBC encrypted by the session key (IV zero), and after decryption contains the concatenation of | ||
+ | - An 8 byte value identifying the track (needed on check-in to verify which copyrighted work will be deleted and adjust the check-out counter) | ||
+ | - Four padding bytes (seen as 00 00 00 00 or 01 01 01 01) | ||
+ | - The 20-byte Content ID | ||
NOTE: The data is split into blocks of 3f00 bytes each (except the | NOTE: The data is split into blocks of 3f00 bytes each (except the | ||
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00 00 00 00 00 00 $u $v $k(1) ... $k(8) $i(1) ... $i(8) | 00 00 00 00 00 00 $u $v $k(1) ... $k(8) $i(1) ... $i(8) | ||
- | where $u$v is the block size (usually 3f00), $k(1) ... $k(8) is the key for DES CBC encryption of the data in this block, and $i(1) ... $i(8) is the IV for the DES CBC encryption. The key itself is DES **decrypted** by the key encryption key, i.e. you have to **encrypt** it to get the plain key. | + | where $u$v is the block size (usually 3f00), $k(x) is the key for DES CBC encryption of the data in this block, and $i(x) is the IV for the DES CBC encryption. The key itself is DES **decrypted** by the key encryption key, i.e. you have to **encrypt** it to get the plain key. |
This means for the total nr of bytes: len + ((len+0x3eff)/ | This means for the total nr of bytes: len + ((len+0x3eff)/ | ||
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==== 11. END AUTHENTICATED SESSION ==== | ==== 11. END AUTHENTICATED SESSION ==== | ||
- | => 00 18 00 08 00 46 f0 03 01 03 81 ff 00 00 00 | + | => 00 18 00 08 00 46 f0 03 01 03 81 ff |
- | <= 09 18 00 08 00 46 f0 03 01 03 81 00 00 00 00 | + | <= 09 18 00 08 00 46 f0 03 01 03 81 00 |
atracdownload-wiki.1276159222.txt.gz · Last modified: 2010/06/10 08:40 by megadiscman