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[Aaru.Decryption] Reformat and cleanup.

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Natalia Portillo
2023-10-03 23:10:41 +01:00
parent ac1db3b2e9
commit 4ce6ff54c8
10 changed files with 1615 additions and 1597 deletions
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328
DVD/CSS.cs
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@@ -58,99 +58,17 @@ public class CSS
{
static readonly byte[,] _playerKeys =
{
{
0x01, 0xaf, 0xe3, 0x12, 0x80
},
{
0x12, 0x11, 0xca, 0x04, 0x3b
},
{
0x14, 0x0c, 0x9e, 0xd0, 0x09
},
{
0x14, 0x71, 0x35, 0xba, 0xe2
},
{
0x1a, 0xa4, 0x33, 0x21, 0xa6
},
{
0x26, 0xec, 0xc4, 0xa7, 0x4e
},
{
0x2c, 0xb2, 0xc1, 0x09, 0xee
},
{
0x2f, 0x25, 0x9e, 0x96, 0xdd
},
{
0x33, 0x2f, 0x49, 0x6c, 0xe0
},
{
0x35, 0x5b, 0xc1, 0x31, 0x0f
},
{
0x36, 0x67, 0xb2, 0xe3, 0x85
},
{
0x39, 0x3d, 0xf1, 0xf1, 0xbd
},
{
0x3b, 0x31, 0x34, 0x0d, 0x91
},
{
0x45, 0xed, 0x28, 0xeb, 0xd3
},
{
0x48, 0xb7, 0x6c, 0xce, 0x69
},
{
0x4b, 0x65, 0x0d, 0xc1, 0xee
},
{
0x4c, 0xbb, 0xf5, 0x5b, 0x23
},
{
0x51, 0x67, 0x67, 0xc5, 0xe0
},
{
0x53, 0x94, 0xe1, 0x75, 0xbf
},
{
0x57, 0x2c, 0x8b, 0x31, 0xae
},
{
0x63, 0xdb, 0x4c, 0x5b, 0x4a
},
{
0x7b, 0x1e, 0x5e, 0x2b, 0x57
},
{
0x85, 0xf3, 0x85, 0xa0, 0xe0
},
{
0xab, 0x1e, 0xe7, 0x7b, 0x72
},
{
0xab, 0x36, 0xe3, 0xeb, 0x76
},
{
0xb1, 0xb8, 0xf9, 0x38, 0x03
},
{
0xb8, 0x5d, 0xd8, 0x53, 0xbd
},
{
0xbf, 0x92, 0xc3, 0xb0, 0xe2
},
{
0xcf, 0x1a, 0xb2, 0xf8, 0x0a
},
{
0xec, 0xa0, 0xcf, 0xb3, 0xff
},
{
0xfc, 0x95, 0xa9, 0x87, 0x35
}
{ 0x01, 0xaf, 0xe3, 0x12, 0x80 }, { 0x12, 0x11, 0xca, 0x04, 0x3b }, { 0x14, 0x0c, 0x9e, 0xd0, 0x09 },
{ 0x14, 0x71, 0x35, 0xba, 0xe2 }, { 0x1a, 0xa4, 0x33, 0x21, 0xa6 }, { 0x26, 0xec, 0xc4, 0xa7, 0x4e },
{ 0x2c, 0xb2, 0xc1, 0x09, 0xee }, { 0x2f, 0x25, 0x9e, 0x96, 0xdd }, { 0x33, 0x2f, 0x49, 0x6c, 0xe0 },
{ 0x35, 0x5b, 0xc1, 0x31, 0x0f }, { 0x36, 0x67, 0xb2, 0xe3, 0x85 }, { 0x39, 0x3d, 0xf1, 0xf1, 0xbd },
{ 0x3b, 0x31, 0x34, 0x0d, 0x91 }, { 0x45, 0xed, 0x28, 0xeb, 0xd3 }, { 0x48, 0xb7, 0x6c, 0xce, 0x69 },
{ 0x4b, 0x65, 0x0d, 0xc1, 0xee }, { 0x4c, 0xbb, 0xf5, 0x5b, 0x23 }, { 0x51, 0x67, 0x67, 0xc5, 0xe0 },
{ 0x53, 0x94, 0xe1, 0x75, 0xbf }, { 0x57, 0x2c, 0x8b, 0x31, 0xae }, { 0x63, 0xdb, 0x4c, 0x5b, 0x4a },
{ 0x7b, 0x1e, 0x5e, 0x2b, 0x57 }, { 0x85, 0xf3, 0x85, 0xa0, 0xe0 }, { 0xab, 0x1e, 0xe7, 0x7b, 0x72 },
{ 0xab, 0x36, 0xe3, 0xeb, 0x76 }, { 0xb1, 0xb8, 0xf9, 0x38, 0x03 }, { 0xb8, 0x5d, 0xd8, 0x53, 0xbd },
{ 0xbf, 0x92, 0xc3, 0xb0, 0xe2 }, { 0xcf, 0x1a, 0xb2, 0xf8, 0x0a }, { 0xec, 0xa0, 0xcf, 0xb3, 0xff },
{ 0xfc, 0x95, 0xa9, 0x87, 0x35 }
};
static readonly byte[] _cssTable1 =
@@ -341,15 +259,7 @@ public class CSS
static readonly byte[,] _permutationChallenge =
{
{
1, 3, 0, 7, 5, 2, 9, 6, 4, 8
},
{
6, 1, 9, 3, 8, 5, 7, 4, 0, 2
},
{
4, 0, 3, 5, 7, 2, 8, 6, 1, 9
}
{ 1, 3, 0, 7, 5, 2, 9, 6, 4, 8 }, { 6, 1, 9, 3, 8, 5, 7, 4, 0, 2 }, { 4, 0, 3, 5, 7, 2, 8, 6, 1, 9 }
};
static readonly byte[,] _permutationVariant =
@@ -370,10 +280,7 @@ public class CSS
0xF2, 0x2A, 0x79, 0x52, 0xFF, 0x1B, 0x7A, 0x11, 0xCA, 0x1A, 0x9B, 0x40, 0xAD, 0x01
};
static readonly byte[] _secret =
{
0x55, 0xD6, 0xC4, 0xC5, 0x28
};
static readonly byte[] _secret = { 0x55, 0xD6, 0xC4, 0xC5, 0x28 };
/// <summary>
/// The disc key returned by the logical unit is encoded with the bus key to prevent man-in-the-middle attacks.
@@ -391,7 +298,7 @@ public class CSS
byte[] key = response.Skip(4).Take(2048).ToArray();
for(uint i = 0; i < key.Length; i++)
key[i] ^= busKey[4 - (i % busKey.Length)];
key[i] ^= busKey[4 - i % busKey.Length];
return new CSS_CPRM.DiscKey
{
@@ -418,7 +325,7 @@ public class CSS
byte[] key = response.Skip(5).Take(5).ToArray();
for(uint i = 0; i < key.Length; i++)
key[i] ^= busKey[4 - (i % busKey.Length)];
key[i] ^= busKey[4 - i % busKey.Length];
return new CSS_CPRM.TitleKey
{
@@ -440,49 +347,49 @@ public class CSS
/// <returns>The encrypted key.</returns>
public static void EncryptKey(DvdCssKeyType keyType, uint variant, byte[] challenge, out byte[] key)
{
byte[] bits = new byte[30];
byte[] scratch = new byte[10];
byte index = sizeof(byte) * 30;
byte[] temp1 = new byte[5];
byte[] temp2 = new byte[5];
byte carry = 0;
var bits = new byte[30];
var scratch = new byte[10];
byte index = sizeof(byte) * 30;
var temp1 = new byte[5];
var temp2 = new byte[5];
byte carry = 0;
key = new byte[5];
for(int i = 9; i >= 0; --i)
for(var i = 9; i >= 0; --i)
scratch[i] = challenge[_permutationChallenge[(uint)keyType, i]];
byte cssVariant = (byte)(keyType == 0 ? variant : _permutationVariant[(uint)keyType - 1, variant]);
var cssVariant = (byte)(keyType == 0 ? variant : _permutationVariant[(uint)keyType - 1, variant]);
for(int i = 5; --i >= 0;)
for(var i = 5; --i >= 0;)
temp1[i] = (byte)(scratch[5 + i] ^ _secret[i] ^ _encryptTable2[i]);
uint lfsr0 = (uint)((temp1[0] << 17) | (temp1[1] << 9) | ((temp1[2] & ~7) << 1) | 8 | (temp1[2] & 7));
uint lfsr1 = (uint)((temp1[3] << 9) | 0x100 | temp1[4]);
var lfsr0 = (uint)(temp1[0] << 17 | temp1[1] << 9 | (temp1[2] & ~7) << 1 | 8 | temp1[2] & 7);
var lfsr1 = (uint)(temp1[3] << 9 | 0x100 | temp1[4]);
do
{
byte val = 0;
for(int bit = 0; bit < 8; ++bit)
for(var bit = 0; bit < 8; ++bit)
{
byte oLfsr0 = (byte)(((lfsr0 >> 24) ^ (lfsr0 >> 21) ^ (lfsr0 >> 20) ^ (lfsr0 >> 12)) & 1);
lfsr0 = (lfsr0 << 1) | oLfsr0;
var oLfsr0 = (byte)((lfsr0 >> 24 ^ lfsr0 >> 21 ^ lfsr0 >> 20 ^ lfsr0 >> 12) & 1);
lfsr0 = lfsr0 << 1 | oLfsr0;
byte oLfsr1 = (byte)(((lfsr1 >> 16) ^ (lfsr1 >> 2)) & 1);
lfsr1 = (lfsr1 << 1) | oLfsr1;
var oLfsr1 = (byte)((lfsr1 >> 16 ^ lfsr1 >> 2) & 1);
lfsr1 = lfsr1 << 1 | oLfsr1;
byte combined = (byte)(Convert.ToByte(oLfsr1 == 0) + carry + Convert.ToByte(oLfsr0 == 0));
carry = (byte)((combined >> 1) & 1);
var combined = (byte)(Convert.ToByte(oLfsr1 == 0) + carry + Convert.ToByte(oLfsr0 == 0));
carry = (byte)(combined >> 1 & 1);
val |= (byte)((combined & 1) << bit);
}
bits[--index] = val;
} while(index > 0);
byte cse = (byte)(_variants[cssVariant] ^ _encryptTable2[cssVariant]);
int term = 0;
var cse = (byte)(_variants[cssVariant] ^ _encryptTable2[cssVariant]);
var term = 0;
for(int i = 5; --i >= 0; term = scratch[i])
for(var i = 5; --i >= 0; term = scratch[i])
{
index = (byte)(bits[25 + i] ^ scratch[i]);
index = (byte)(_encryptTable1[index] ^ ~_encryptTable2[index] ^ cse);
@@ -493,7 +400,7 @@ public class CSS
temp1[4] ^= temp1[0];
term = 0;
for(int i = 5; --i >= 0; term = temp1[i])
for(var i = 5; --i >= 0; term = temp1[i])
{
index = (byte)(bits[20 + i] ^ temp1[i]);
index = (byte)(_encryptTable1[index] ^ ~_encryptTable2[index] ^ cse);
@@ -504,7 +411,7 @@ public class CSS
temp2[4] ^= temp2[0];
term = 0;
for(int i = 5; --i >= 0; term = temp2[i])
for(var i = 5; --i >= 0; term = temp2[i])
{
index = (byte)(bits[15 + i] ^ temp2[i]);
index = (byte)(_encryptTable1[index] ^ ~_encryptTable2[index] ^ cse);
@@ -516,7 +423,7 @@ public class CSS
temp1[4] ^= temp1[0];
term = 0;
for(int i = 5; --i >= 0; term = temp1[i])
for(var i = 5; --i >= 0; term = temp1[i])
{
index = (byte)(bits[10 + i] ^ temp1[i]);
index = (byte)(_encryptTable1[index] ^ ~_encryptTable2[index] ^ cse);
@@ -528,7 +435,7 @@ public class CSS
temp2[4] ^= temp2[0];
term = 0;
for(int i = 5; --i >= 0; term = temp2[i])
for(var i = 5; --i >= 0; term = temp2[i])
{
index = (byte)(bits[5 + i] ^ temp2[i]);
index = (byte)(_encryptTable1[index] ^ ~_encryptTable2[index] ^ cse);
@@ -539,7 +446,7 @@ public class CSS
temp1[4] ^= temp1[0];
term = 0;
for(int i = 5; --i >= 0; term = temp1[i])
for(var i = 5; --i >= 0; term = temp1[i])
{
index = (byte)(bits[i] ^ temp1[i]);
index = (byte)(_encryptTable1[index] ^ ~_encryptTable2[index] ^ cse);
@@ -556,27 +463,27 @@ public class CSS
static void DecryptKey(byte invert, byte[] cryptoKey, byte[] encryptedKey, out byte[] decryptedKey)
{
decryptedKey = new byte[5];
byte[] k = new byte[5];
var k = new byte[5];
uint lfsr1Lo = (uint)(cryptoKey[0] | 0x100);
var lfsr1Lo = (uint)(cryptoKey[0] | 0x100);
uint lfsr1Hi = cryptoKey[1];
uint lfsr0 = (uint)(((cryptoKey[4] << 17) | (cryptoKey[3] << 9) | (cryptoKey[2] << 1)) + 8 -
(cryptoKey[2] & 7));
var lfsr0 = (uint)((cryptoKey[4] << 17 | cryptoKey[3] << 9 | cryptoKey[2] << 1) + 8 -
(cryptoKey[2] & 7));
lfsr0 = (uint)((_cssTable4[lfsr0 & 0xff] << 24) | (_cssTable4[(lfsr0 >> 8) & 0xff] << 16) |
(_cssTable4[(lfsr0 >> 16) & 0xff] << 8) | _cssTable4[(lfsr0 >> 24) & 0xff]);
lfsr0 = (uint)(_cssTable4[lfsr0 & 0xff] << 24 | _cssTable4[lfsr0 >> 8 & 0xff] << 16 |
_cssTable4[lfsr0 >> 16 & 0xff] << 8 | _cssTable4[lfsr0 >> 24 & 0xff]);
uint combined = 0;
for(uint i = 0; i < 5; i++)
{
byte oLfsr1 = (byte)(_cssTable2[lfsr1Hi] ^ _cssTable3[lfsr1Lo]);
var oLfsr1 = (byte)(_cssTable2[lfsr1Hi] ^ _cssTable3[lfsr1Lo]);
lfsr1Hi = lfsr1Lo >> 1;
lfsr1Lo = ((lfsr1Lo & 1) << 8) ^ oLfsr1;
lfsr1Lo = (lfsr1Lo & 1) << 8 ^ oLfsr1;
oLfsr1 = _cssTable4[oLfsr1];
byte oLfsr0 = (byte)(((((((lfsr0 >> 8) ^ lfsr0) >> 1) ^ lfsr0) >> 3) ^ lfsr0) >> 7);
lfsr0 = (lfsr0 >> 8) | ((uint)oLfsr0 << 24);
var oLfsr0 = (byte)((((lfsr0 >> 8 ^ lfsr0) >> 1 ^ lfsr0) >> 3 ^ lfsr0) >> 7);
lfsr0 = lfsr0 >> 8 | (uint)oLfsr0 << 24;
combined += (uint)((oLfsr0 ^ invert) + oLfsr1);
k[i] = (byte)(combined & 0xff);
combined >>= 8;
@@ -636,14 +543,14 @@ public class CSS
/// <param name="blockSize">Size of one sector.</param>
/// <returns>The decrypted sector.</returns>
public static byte[] DecryptSector(byte[] sectorData, byte[] keyData, byte[]? cmiData, uint blocks = 1,
uint blockSize = 2048)
uint blockSize = 2048)
{
// None of the sectors are encrypted
if((cmiData != null && cmiData.All(static cmi => (cmi & 0x80) >> 7 == 0)) ||
if(cmiData != null && cmiData.All(static cmi => (cmi & 0x80) >> 7 == 0) ||
keyData.All(static k => k == 0))
return sectorData;
byte[] decryptedBuffer = new byte[sectorData.Length];
var decryptedBuffer = new byte[sectorData.Length];
for(uint i = 0; i < blocks; i++)
{
@@ -665,21 +572,21 @@ public class CSS
}
/// <summary>
/// Unscrambles a DVD sector with a title key.
/// Unscrambles a DVD sector with a title key.
/// </summary>
/// <param name="key">The title key.</param>
/// <param name="sector">The scrambled sector.</param>
/// <returns>The unscrambled sector.</returns>
static byte[] UnscrambleSector(IReadOnlyList<byte> key, byte[] sector)
{
long lfsr1Lo = (key[0] ^ sector[0x54]) | 0x100;
long lfsr1Lo = key[0] ^ sector[0x54] | 0x100;
long lfsr1Hi = key[1] ^ sector[0x55];
long lfsr0 = (key[2] | (key[3] << 8) | (key[4] << 16)) ^
(sector[0x56] | (sector[0x57] << 8) | (sector[0x58] << 16));
long lfsr0 = (key[2] | key[3] << 8 | key[4] << 16) ^
(sector[0x56] | sector[0x57] << 8 | sector[0x58] << 16);
long oLfsr1 = lfsr0 & 7;
lfsr0 = (lfsr0 * 2) + 8 - oLfsr1;
lfsr0 = lfsr0 * 2 + 8 - oLfsr1;
long combined = 0;
@@ -687,13 +594,13 @@ public class CSS
{
oLfsr1 = _cssTable2[lfsr1Hi] ^ _cssTable3[lfsr1Lo];
lfsr1Hi = lfsr1Lo >> 1;
lfsr1Lo = ((lfsr1Lo & 1) << 8) ^ oLfsr1;
lfsr1Lo = (lfsr1Lo & 1) << 8 ^ oLfsr1;
oLfsr1 = _cssTable5[oLfsr1];
long oLfsr0 = (((((((lfsr0 >> 3) ^ lfsr0) >> 1) ^ lfsr0) >> 8) ^ lfsr0) >> 5) & 0xff;
lfsr0 = (lfsr0 << 8) | oLfsr0;
long oLfsr0 = (((lfsr0 >> 3 ^ lfsr0) >> 1 ^ lfsr0) >> 8 ^ lfsr0) >> 5 & 0xff;
lfsr0 = lfsr0 << 8 | oLfsr0;
oLfsr0 = _cssTable4[oLfsr0];
combined += oLfsr0 + oLfsr1;
sector[i] = (byte)(_cssTable1[sector[i]] ^ (combined & 0xff));
sector[i] = (byte)(_cssTable1[sector[i]] ^ combined & 0xff);
combined >>= 8;
}
@@ -705,14 +612,17 @@ public class CSS
}
/// <summary>
/// Analyzes data to try to figure out if the sector is encrypted, including
/// <list type="bullet">
/// <item>If the packet is not an MPEG packet</item>
/// <item>If the CMI tells us the sector isn't encrypted</item>
/// <item>If the key is all zeroes</item>
/// <item>If the MPEG Packetized Elementary Stream scrambling control value tells us the packet is not scrambled</item>
/// <item>If if the packet is system_header, padding_stream or private_stream2 (cannot be encrypted according to libdvdcss)</item>
/// </list>
/// Analyzes data to try to figure out if the sector is encrypted, including
/// <list type="bullet">
/// <item>If the packet is not an MPEG packet</item>
/// <item>If the CMI tells us the sector isn't encrypted</item>
/// <item>If the key is all zeroes</item>
/// <item>If the MPEG Packetized Elementary Stream scrambling control value tells us the packet is not scrambled</item>
/// <item>
/// If if the packet is system_header, padding_stream or private_stream2 (cannot be encrypted according to
/// libdvdcss)
/// </item>
/// </list>
/// </summary>
/// <param name="cmi">The Copyright Management Information.</param>
/// <param name="key">The title key.</param>
@@ -754,21 +664,21 @@ public class CSS
if(cmi.RegionInformation is 0xFF or 0x00)
return true;
return ((rpc.RegionMask & 0x01) == (cmi.RegionInformation & 0x01) && (rpc.RegionMask & 0x01) != 0x01) ||
((rpc.RegionMask & 0x02) == (cmi.RegionInformation & 0x02) && (rpc.RegionMask & 0x02) != 0x02) ||
((rpc.RegionMask & 0x04) == (cmi.RegionInformation & 0x04) && (rpc.RegionMask & 0x04) != 0x04) ||
((rpc.RegionMask & 0x08) == (cmi.RegionInformation & 0x08) && (rpc.RegionMask & 0x08) != 0x08) ||
((rpc.RegionMask & 0x10) == (cmi.RegionInformation & 0x10) && (rpc.RegionMask & 0x10) != 0x10) ||
((rpc.RegionMask & 0x20) == (cmi.RegionInformation & 0x20) && (rpc.RegionMask & 0x20) != 0x20) ||
((rpc.RegionMask & 0x40) == (cmi.RegionInformation & 0x40) && (rpc.RegionMask & 0x40) != 0x40) ||
((rpc.RegionMask & 0x80) == (cmi.RegionInformation & 0x80) && (rpc.RegionMask & 0x80) != 0x80);
return (rpc.RegionMask & 0x01) == (cmi.RegionInformation & 0x01) && (rpc.RegionMask & 0x01) != 0x01 ||
(rpc.RegionMask & 0x02) == (cmi.RegionInformation & 0x02) && (rpc.RegionMask & 0x02) != 0x02 ||
(rpc.RegionMask & 0x04) == (cmi.RegionInformation & 0x04) && (rpc.RegionMask & 0x04) != 0x04 ||
(rpc.RegionMask & 0x08) == (cmi.RegionInformation & 0x08) && (rpc.RegionMask & 0x08) != 0x08 ||
(rpc.RegionMask & 0x10) == (cmi.RegionInformation & 0x10) && (rpc.RegionMask & 0x10) != 0x10 ||
(rpc.RegionMask & 0x20) == (cmi.RegionInformation & 0x20) && (rpc.RegionMask & 0x20) != 0x20 ||
(rpc.RegionMask & 0x40) == (cmi.RegionInformation & 0x40) && (rpc.RegionMask & 0x40) != 0x40 ||
(rpc.RegionMask & 0x80) == (cmi.RegionInformation & 0x80) && (rpc.RegionMask & 0x80) != 0x80;
}
/// <summary>
/// This tries to find a title key for a range of sectors by doing a brute force pattern search developed by
/// Ethan Hawke of DeCSSPlus. CSS encrypted sectors have parts of them that are unencrypted (byte 0x0 - 0x80).
/// We try to find a long pattern of repeated bytes just before the encryption starts. If we assume this
/// pattern continues into the encrypted part, we can force keys until one of them satisfies this condition.
/// This tries to find a title key for a range of sectors by doing a brute force pattern search developed by
/// Ethan Hawke of DeCSSPlus. CSS encrypted sectors have parts of them that are unencrypted (byte 0x0 - 0x80).
/// We try to find a long pattern of repeated bytes just before the encryption starts. If we assume this
/// pattern continues into the encrypted part, we can force keys until one of them satisfies this condition.
/// </summary>
/// <param name="sector">The sector to analyze.</param>
/// <param name="key">The key found.</param>
@@ -782,7 +692,7 @@ public class CSS
for(uint i = 2; i < 0x30; i++)
{
// Find the number of bytes that repeats in cycles.
for(uint j = i + 1; j < 0x80 && sector[0x7F - (j % i)] == sector[0x7F - j]; j++)
for(uint j = i + 1; j < 0x80 && sector[0x7F - j % i] == sector[0x7F - j]; j++)
{
if(j <= bestPatternLength)
continue;
@@ -798,18 +708,18 @@ public class CSS
bestPatternLength / bestPattern < 2)
return false;
int offset = (int)(0x80 - ((bestPatternLength / bestPattern) * bestPattern));
var offset = (int)(0x80 - bestPatternLength / bestPattern * bestPattern);
int result = RecoverTitleKey(0, sector.Skip(0x80).Take(sector.Length - 0x80).ToArray(),
sector.Skip(offset).Take((int)(sector.Length - offset)).ToArray(),
sector.Skip(offset).Take(sector.Length - offset).ToArray(),
sector.Skip(0x54).Take(5).ToArray(), out key);
return result >= 0;
}
/// <summary>
/// Takes a guessed plain text and a encrypted bytes and tries to recover the title key
/// from those. Attack developed by Frank Stevenson.
/// Takes a guessed plain text and a encrypted bytes and tries to recover the title key
/// from those. Attack developed by Frank Stevenson.
/// </summary>
/// <param name="start">Start position.</param>
/// <param name="encryptedBytes">Buffer with encrypted bytes.</param>
@@ -817,15 +727,15 @@ public class CSS
/// <param name="sectorSeed">This sector's seed values.</param>
/// <param name="key">The title key.</param>
/// <returns>Positive values on success.</returns>
static int RecoverTitleKey(uint start, byte[] encryptedBytes, byte[] decryptedBytes, byte[] sectorSeed,
static int RecoverTitleKey(uint start, byte[] encryptedBytes, byte[] decryptedBytes, byte[] sectorSeed,
out byte[] key)
{
byte[] buffer = new byte[10];
long oLfsr1;
long oLfsr0;
long iTry;
uint i;
int exit = -1;
var buffer = new byte[10];
long oLfsr1;
long oLfsr0;
long iTry;
uint i;
int exit = -1;
key = new byte[5];
for(i = 0; i < 10; i++)
@@ -833,7 +743,7 @@ public class CSS
for(iTry = start; iTry < 0x10000; iTry++)
{
long lfsr1Lo = (iTry >> 8) | 0x100;
long lfsr1Lo = iTry >> 8 | 0x100;
long lfsr1Hi = iTry & 0xff;
long lfsr0 = 0;
long combined = 0;
@@ -844,12 +754,12 @@ public class CSS
// Advance LFSR1 normally
oLfsr1 = _cssTable2[lfsr1Hi] ^ _cssTable3[lfsr1Lo];
lfsr1Hi = lfsr1Lo >> 1;
lfsr1Lo = ((lfsr1Lo & 1) << 8) ^ oLfsr1;
lfsr1Lo = (lfsr1Lo & 1) << 8 ^ oLfsr1;
oLfsr1 = _cssTable5[oLfsr1];
oLfsr0 = buffer[i];
if(combined > 0)
oLfsr0 = (oLfsr0 + 0xff) & 0x0ff;
oLfsr0 = oLfsr0 + 0xff & 0x0ff;
if(oLfsr0 < oLfsr1)
oLfsr0 += 0x100;
@@ -857,7 +767,7 @@ public class CSS
oLfsr0 -= oLfsr1;
combined += oLfsr0 + oLfsr1;
oLfsr0 = _cssTable4[oLfsr0];
lfsr0 = (lfsr0 << 8) | oLfsr0;
lfsr0 = lfsr0 << 8 | oLfsr0;
combined >>= 8;
}
@@ -868,10 +778,10 @@ public class CSS
{
oLfsr1 = _cssTable2[lfsr1Hi] ^ _cssTable3[lfsr1Lo];
lfsr1Hi = lfsr1Lo >> 1;
lfsr1Lo = ((lfsr1Lo & 1) << 8) ^ oLfsr1;
lfsr1Lo = (lfsr1Lo & 1) << 8 ^ oLfsr1;
oLfsr1 = _cssTable5[oLfsr1];
oLfsr0 = (((((((lfsr0 >> 3) ^ lfsr0) >> 1) ^ lfsr0) >> 8) ^ lfsr0) >> 5) & 0xff;
lfsr0 = (lfsr0 << 8) | oLfsr0;
oLfsr0 = (((lfsr0 >> 3 ^ lfsr0) >> 1 ^ lfsr0) >> 8 ^ lfsr0) >> 5 & 0xff;
lfsr0 = lfsr0 << 8 | oLfsr0;
oLfsr0 = _cssTable4[oLfsr0];
combined += oLfsr0 + oLfsr1;
@@ -889,12 +799,12 @@ public class CSS
for(i = 0; i < 4; i++)
{
lfsr1Lo = lfsr0 & 0xff;
lfsr0 = (lfsr0 >> 8);
lfsr0 = lfsr0 >> 8;
for(uint j = 0; j < 256; j++)
{
lfsr0 = (lfsr0 & 0x1ffff) | (j << 17);
oLfsr0 = (((((((lfsr0 >> 3) ^ lfsr0) >> 1) ^ lfsr0) >> 8) ^ lfsr0) >> 5) & 0xff;
lfsr0 = lfsr0 & 0x1ffff | j << 17;
oLfsr0 = (((lfsr0 >> 3 ^ lfsr0) >> 1 ^ lfsr0) >> 8 ^ lfsr0) >> 5 & 0xff;
if(oLfsr0 == lfsr1Lo)
break;
@@ -905,14 +815,14 @@ public class CSS
for(combined = 0; combined < 8; combined++)
{
if(((oLfsr1 + combined) * 2) + 8 - ((oLfsr1 + combined) & 7) != lfsr0)
if((oLfsr1 + combined) * 2 + 8 - (oLfsr1 + combined & 7) != lfsr0)
continue;
key[0] = (byte)(iTry >> 8);
key[1] = (byte)(iTry & 0xFF);
key[2] = (byte)(((oLfsr1 + combined) >> 0) & 0xFF);
key[3] = (byte)(((oLfsr1 + combined) >> 8) & 0xFF);
key[4] = (byte)(((oLfsr1 + combined) >> 16) & 0xFF);
key[1] = (byte)(iTry & 0xFF);
key[2] = (byte)(oLfsr1 + combined >> 0 & 0xFF);
key[3] = (byte)(oLfsr1 + combined >> 8 & 0xFF);
key[4] = (byte)(oLfsr1 + combined >> 16 & 0xFF);
exit = (int)(iTry + 1);
}
}
@@ -930,7 +840,7 @@ public class CSS
}
/// <summary>
/// Tries to find a title key by attacking CSS vulnerabilities.
/// Tries to find a title key by attacking CSS vulnerabilities.
/// </summary>
/// <param name="input"><c>IOpticalMediaImage</c> to find the title key in.</param>
/// <param name="startSector">Sector index to begin search.</param>
@@ -938,7 +848,7 @@ public class CSS
/// <returns>The title key.</returns>
static byte[] FindTitleKey(IOpticalMediaImage input, ulong startSector, ulong sectorsToSearch = 20000)
{
byte[] titleKey = new byte[5];
var titleKey = new byte[5];
for(ulong i = 0; i < sectorsToSearch; i++)
{
@@ -955,7 +865,7 @@ public class CSS
}
/// <summary>
/// Generates title keys for all sectors in a track.
/// Generates title keys for all sectors in a track.
/// </summary>
/// <param name="input"><c>IOpticalMediaImage</c> to generate keys for.</param>
/// <param name="partitions">List of <c>Partition</c> to analyze.</param>
@@ -963,9 +873,9 @@ public class CSS
/// <param name="pluginType"></param>
/// <returns>A byte array with keys for every sector in the track. One key is 5 bytes.</returns>
public static byte[] GenerateTitleKeys(IOpticalMediaImage input, List<Partition> partitions, ulong trackSectors,
Type pluginType)
Type pluginType)
{
byte[] keys = new byte[trackSectors * 5];
var keys = new byte[trackSectors * 5];
foreach(Partition partition in partitions)
{
@@ -1004,7 +914,7 @@ public class CSS
}
/// <summary>
/// DVD video discs always have a <c>VIDEO_TS</c> folder. If it doesn't have one, it's not a DVD video.
/// DVD video discs always have a <c>VIDEO_TS</c> folder. If it doesn't have one, it's not a DVD video.
/// </summary>
/// <param name="input"><c>IOpticalMediaImage</c> to check for <c>VIDEO_TS</c> folder in.</param>
/// <param name="fs"><c>IReadOnlyFilesystem</c> to check in.</param>

65
DVD/Dump.cs
View File

@@ -70,14 +70,14 @@ public sealed class Dump
out double duration)
{
senseBuffer = new byte[64];
byte[] cdb = new byte[12];
var cdb = new byte[12];
buffer = new byte[8];
cdb[0] = (byte)ScsiCommands.ReportKey;
cdb[7] = (byte)keyClass;
cdb[8] = (byte)((buffer.Length & 0xFF00) >> 8);
cdb[9] = (byte)(buffer.Length & 0xFF);
cdb[10] = (byte)((byte)CssReportKeyFormat.Asf ^ ((Agid & 0x03) << 6));
cdb[10] = (byte)((byte)CssReportKeyFormat.Asf ^ (Agid & 0x03) << 6);
_dev.SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out bool sense);
@@ -98,14 +98,14 @@ public sealed class Dump
out double duration)
{
senseBuffer = new byte[64];
byte[] cdb = new byte[12];
var cdb = new byte[12];
buffer = new byte[8];
cdb[0] = (byte)ScsiCommands.ReportKey;
cdb[7] = (byte)keyClass;
cdb[8] = (byte)((buffer.Length & 0xFF00) >> 8);
cdb[9] = (byte)(buffer.Length & 0xFF);
cdb[10] = (byte)((byte)CssReportKeyFormat.RpcState ^ ((Agid & 0x03) << 6));
cdb[10] = (byte)((byte)CssReportKeyFormat.RpcState ^ (Agid & 0x03) << 6);
_dev.SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out bool sense);
@@ -126,14 +126,14 @@ public sealed class Dump
out double duration)
{
senseBuffer = new byte[64];
byte[] cdb = new byte[12];
var cdb = new byte[12];
buffer = Array.Empty<byte>();
cdb[0] = (byte)ScsiCommands.ReportKey;
cdb[7] = (byte)keyClass;
cdb[8] = (byte)((buffer.Length & 0xFF00) >> 8);
cdb[9] = (byte)(buffer.Length & 0xFF);
cdb[10] = (byte)((byte)CssReportKeyFormat.InvalidateAgid ^ ((Agid & 0x03) << 6));
cdb[10] = (byte)((byte)CssReportKeyFormat.InvalidateAgid ^ (Agid & 0x03) << 6);
_dev.SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out bool sense);
@@ -154,14 +154,14 @@ public sealed class Dump
out double duration)
{
senseBuffer = new byte[64];
byte[] cdb = new byte[12];
var cdb = new byte[12];
buffer = new byte[8];
cdb[0] = (byte)ScsiCommands.ReportKey;
cdb[7] = (byte)keyClass;
cdb[8] = (byte)((buffer.Length & 0xFF00) >> 8);
cdb[9] = (byte)(buffer.Length & 0xFF);
cdb[10] = (byte)((byte)CssReportKeyFormat.AgidForCssCppm ^ ((Agid & 0x03) << 6));
cdb[10] = (byte)((byte)CssReportKeyFormat.AgidForCssCppm ^ (Agid & 0x03) << 6);
_dev.SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out bool sense);
@@ -183,14 +183,14 @@ public sealed class Dump
out double duration)
{
senseBuffer = new byte[64];
byte[] cdb = new byte[12];
var cdb = new byte[12];
buffer = new byte[12];
cdb[0] = (byte)ScsiCommands.ReportKey;
cdb[7] = (byte)keyClass;
cdb[8] = (byte)((buffer.Length & 0xFF00) >> 8);
cdb[9] = (byte)(buffer.Length & 0xFF);
cdb[10] = (byte)((byte)CssReportKeyFormat.Key1 ^ ((Agid & 0x03) << 6));
cdb[10] = (byte)((byte)CssReportKeyFormat.Key1 ^ (Agid & 0x03) << 6);
_dev.SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out bool sense);
@@ -211,14 +211,14 @@ public sealed class Dump
out double duration)
{
senseBuffer = new byte[64];
byte[] cdb = new byte[12];
var cdb = new byte[12];
buffer = new byte[16];
cdb[0] = (byte)ScsiCommands.ReportKey;
cdb[7] = (byte)keyClass;
cdb[8] = (byte)((buffer.Length & 0xFF00) >> 8);
cdb[9] = (byte)(buffer.Length & 0xFF);
cdb[10] = (byte)((byte)CssReportKeyFormat.ChallengeKey ^ ((Agid & 0x03) << 6));
cdb[10] = (byte)((byte)CssReportKeyFormat.ChallengeKey ^ (Agid & 0x03) << 6);
_dev.SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out bool sense);
@@ -236,20 +236,20 @@ public sealed class Dump
/// <param name="timeout">Timeout in seconds.</param>
/// <param name="duration">Duration in milliseconds it took for the device to execute the command.</param>
/// <returns><c>true</c> if the command failed and <paramref name="senseBuffer" /> contains the sense buffer.</returns>
public bool SendChallenge(out byte[] buffer, out byte[] senseBuffer, DvdCssKeyClass keyClass, byte[] challengeKey,
uint timeout, out double duration)
public bool SendChallenge(out byte[] buffer, out byte[] senseBuffer, DvdCssKeyClass keyClass, byte[] challengeKey,
uint timeout, out double duration)
{
senseBuffer = new byte[64];
byte[] cdb = new byte[12];
var cdb = new byte[12];
buffer = new byte[16];
cdb[0] = (byte)ScsiCommands.SendKey;
cdb[7] = (byte)keyClass;
cdb[8] = (byte)((buffer.Length & 0xFF00) >> 8);
cdb[9] = (byte)(buffer.Length & 0xFF);
cdb[10] = (byte)((byte)CssSendKeyFormat.ChallengeKey ^ ((Agid & 0x03) << 6));
buffer[0] = (byte)(((buffer.Length - 2) & 0xFF00) >> 8);
buffer[1] = (byte)((buffer.Length - 2) & 0xFF);
cdb[10] = (byte)((byte)CssSendKeyFormat.ChallengeKey ^ (Agid & 0x03) << 6);
buffer[0] = (byte)((buffer.Length - 2 & 0xFF00) >> 8);
buffer[1] = (byte)(buffer.Length - 2 & 0xFF);
buffer[4] = challengeKey[9];
buffer[5] = challengeKey[8];
buffer[6] = challengeKey[7];
@@ -283,16 +283,16 @@ public sealed class Dump
out double duration)
{
senseBuffer = new byte[64];
byte[] cdb = new byte[12];
var cdb = new byte[12];
buffer = new byte[12];
cdb[0] = (byte)ScsiCommands.SendKey;
cdb[7] = (byte)keyClass;
cdb[8] = (byte)((buffer.Length & 0xFF00) >> 8);
cdb[9] = (byte)(buffer.Length & 0xFF);
cdb[10] = (byte)((byte)CssSendKeyFormat.Key2 ^ ((Agid & 0x03) << 6));
buffer[0] = (byte)(((buffer.Length - 2) & 0xFF00) >> 8);
buffer[1] = (byte)((buffer.Length - 2) & 0xFF);
cdb[10] = (byte)((byte)CssSendKeyFormat.Key2 ^ (Agid & 0x03) << 6);
buffer[0] = (byte)((buffer.Length - 2 & 0xFF00) >> 8);
buffer[1] = (byte)(buffer.Length - 2 & 0xFF);
buffer[4] = key2[4];
buffer[5] = key2[3];
buffer[6] = key2[2];
@@ -318,7 +318,7 @@ public sealed class Dump
public bool ReadDiscKey(out byte[] buffer, out byte[] senseBuffer, uint timeout, out double duration)
{
senseBuffer = new byte[64];
byte[] cdb = new byte[12];
var cdb = new byte[12];
buffer = new byte[2052];
cdb[0] = (byte)ScsiCommands.ReadDiscStructure;
@@ -348,10 +348,10 @@ public sealed class Dump
buffer = Array.Empty<byte>();
senseBuffer = new byte[64];
bool sense = false;
byte[] challenge = new byte[CHALLENGE_SIZE];
byte[] key1 = new byte[KEY_SIZE];
byte variant = 0;
var sense = false;
var challenge = new byte[CHALLENGE_SIZE];
var key1 = new byte[KEY_SIZE];
byte variant = 0;
for(byte i = 0; i < 4; i++)
{
@@ -368,7 +368,8 @@ public sealed class Dump
out duration);
break;
case CopyrightType.CPRM: throw new NotImplementedException();
case CopyrightType.CPRM:
throw new NotImplementedException();
}
if(sense)
@@ -450,8 +451,8 @@ public sealed class Dump
/// <param name="timeout">Timeout in seconds.</param>
/// <param name="duration">Duration in milliseconds it took for the device to execute the command.</param>
/// <returns><c>true</c> if the command failed and <paramref name="senseBuffer" /> contains the sense buffer.</returns>
public bool ReadTitleKey(out byte[] buffer, out byte[] senseBuffer, DvdCssKeyClass keyClass, ulong address,
uint timeout, out double duration)
public bool ReadTitleKey(out byte[] buffer, out byte[] senseBuffer, DvdCssKeyClass keyClass, ulong address,
uint timeout, out double duration)
{
// We need to be in a bus key state to read title keys. Only CSS has title keys.
ReadBusKey(out buffer, out senseBuffer, CopyrightType.CSS, timeout, out duration);
@@ -459,7 +460,7 @@ public sealed class Dump
BusKey = buffer;
senseBuffer = new byte[64];
byte[] cdb = new byte[12];
var cdb = new byte[12];
buffer = new byte[12];
cdb[0] = (byte)ScsiCommands.ReportKey;
@@ -470,7 +471,7 @@ public sealed class Dump
cdb[7] = (byte)keyClass;
cdb[8] = (byte)((buffer.Length & 0xFF00) >> 8);
cdb[9] = (byte)(buffer.Length & 0xFF);
cdb[10] = (byte)((byte)CssReportKeyFormat.TitleKey ^ ((Agid & 0x03) << 6));
cdb[10] = (byte)((byte)CssReportKeyFormat.TitleKey ^ (Agid & 0x03) << 6);
_dev.SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out bool sense);

131
DVD/MPEG.cs
View File

@@ -44,44 +44,107 @@ namespace Aaru.Decryption.DVD;
public class MPEG
{
static byte[] _mpeg2PackHeaderStartCode =
{
0x0, 0x0, 0x1
};
#region Mpeg2StreamId enum
public enum Mpeg2StreamId : byte
{
ProgramEnd = 0xB9, PackHeader = 0xBA, SystemHeader = 0xBB,
ProgramStreamMap = 0xBC, PrivateStream1 = 0xBD, PaddingStream = 0xBE,
PrivateStream2 = 0xBF, EcmStream = 0xF0, EmmStream = 0xF1,
ItuTRecH222_0_or_IsoIec13818_1AnnexA_or_IsoIec13818_6DsmccStream = 0xF2, IsoIec13522Stream = 0xF3,
ItuTRecH222_1TypeA = 0xF4, ItuTRecH222_1TypeB = 0xF5, ItuTRecH222_1TypeC = 0xF6,
ItuTRecH222_1TypeD = 0xF7, ItuTRecH222_1TypeE = 0xF8, AncillaryStream = 0xF9,
Reserved1 = 0xFA, Reserved2 = 0xFB, Reserved3 = 0xFC,
Reserved4 = 0xFD, Reserved5 = 0xFE, ProgramStreamDirectory = 0xFF,
ProgramEnd = 0xB9,
PackHeader = 0xBA,
SystemHeader = 0xBB,
ProgramStreamMap = 0xBC,
PrivateStream1 = 0xBD,
PaddingStream = 0xBE,
PrivateStream2 = 0xBF,
EcmStream = 0xF0,
EmmStream = 0xF1,
ItuTRecH222_0_or_IsoIec13818_1AnnexA_or_IsoIec13818_6DsmccStream = 0xF2,
IsoIec13522Stream = 0xF3,
ItuTRecH222_1TypeA = 0xF4,
ItuTRecH222_1TypeB = 0xF5,
ItuTRecH222_1TypeC = 0xF6,
ItuTRecH222_1TypeD = 0xF7,
ItuTRecH222_1TypeE = 0xF8,
AncillaryStream = 0xF9,
Reserved1 = 0xFA,
Reserved2 = 0xFB,
Reserved3 = 0xFC,
Reserved4 = 0xFD,
Reserved5 = 0xFE,
ProgramStreamDirectory = 0xFF,
// DVD Video can only hold 8 audio streams
MpegAudioStream1 = 0xC0, MpegAudioStream2 = 0xC1, MpegAudioStream3 = 0xC2,
MpegAudioStream4 = 0xC3, MpegAudioStream5 = 0xC4, MpegAudioStream6 = 0xC5,
MpegAudioStream7 = 0xC6, MpegAudioStream8 = 0xC7, MpegAudioStream9 = 0xC8,
MpegAudioStream10 = 0xC9, MpegAudioStream11 = 0xCA, MpegAudioStream12 = 0xCB,
MpegAudioStream13 = 0xCC, MpegAudioStream14 = 0xCD, MpegAudioStream15 = 0xCE,
MpegAudioStream16 = 0xCF, MpegAudioStream17 = 0xD0, MpegAudioStream18 = 0xD1,
MpegAudioStream19 = 0xD2, MpegAudioStream20 = 0xD3, MpegAudioStream21 = 0xD4,
MpegAudioStream22 = 0xD5, MpegAudioStream23 = 0xD6, MpegAudioStream24 = 0xD7,
MpegAudioStream25 = 0xD8, MpegAudioStream26 = 0xD9, MpegAudioStream27 = 0xDA,
MpegAudioStream28 = 0xDB, MpegAudioStream29 = 0xDC, MpegAudioStream30 = 0xDD,
MpegAudioStream31 = 0xDE, MpegAudioStream32 = 0xDF,
MpegAudioStream1 = 0xC0,
MpegAudioStream2 = 0xC1,
MpegAudioStream3 = 0xC2,
MpegAudioStream4 = 0xC3,
MpegAudioStream5 = 0xC4,
MpegAudioStream6 = 0xC5,
MpegAudioStream7 = 0xC6,
MpegAudioStream8 = 0xC7,
MpegAudioStream9 = 0xC8,
MpegAudioStream10 = 0xC9,
MpegAudioStream11 = 0xCA,
MpegAudioStream12 = 0xCB,
MpegAudioStream13 = 0xCC,
MpegAudioStream14 = 0xCD,
MpegAudioStream15 = 0xCE,
MpegAudioStream16 = 0xCF,
MpegAudioStream17 = 0xD0,
MpegAudioStream18 = 0xD1,
MpegAudioStream19 = 0xD2,
MpegAudioStream20 = 0xD3,
MpegAudioStream21 = 0xD4,
MpegAudioStream22 = 0xD5,
MpegAudioStream23 = 0xD6,
MpegAudioStream24 = 0xD7,
MpegAudioStream25 = 0xD8,
MpegAudioStream26 = 0xD9,
MpegAudioStream27 = 0xDA,
MpegAudioStream28 = 0xDB,
MpegAudioStream29 = 0xDC,
MpegAudioStream30 = 0xDD,
MpegAudioStream31 = 0xDE,
MpegAudioStream32 = 0xDF,
// DVD Video can only hold 1 video stream
MpegVideStream1 = 0xE0, MpegVideStream2 = 0xE1, MpegVideStream3 = 0xE2,
MpegVideStream4 = 0xE3, MpegVideStream5 = 0xE4, MpegVideStream6 = 0xE5,
MpegVideStream7 = 0xE6, MpegVideStream8 = 0xE7, MpegVideStream9 = 0xE8,
MpegVideStream10 = 0xE9, MpegVideStream11 = 0xEA, MpegVideStream12 = 0xEB,
MpegVideStream13 = 0xEC, MpegVideStream14 = 0xED, MpegVideStream15 = 0xEE,
MpegVideStream1 = 0xE0,
MpegVideStream2 = 0xE1,
MpegVideStream3 = 0xE2,
MpegVideStream4 = 0xE3,
MpegVideStream5 = 0xE4,
MpegVideStream6 = 0xE5,
MpegVideStream7 = 0xE6,
MpegVideStream8 = 0xE7,
MpegVideStream9 = 0xE8,
MpegVideStream10 = 0xE9,
MpegVideStream11 = 0xEA,
MpegVideStream12 = 0xEB,
MpegVideStream13 = 0xEC,
MpegVideStream14 = 0xED,
MpegVideStream15 = 0xEE,
MpegVideStream16 = 0xEF
}
#endregion
static readonly byte[] _mpeg2PackHeaderStartCode = { 0x0, 0x0, 0x1 };
public static bool ContainsMpegPackets(byte[] sectorData, uint blocks = 1, uint blockSize = 2048)
{
for(uint i = 0; i < blocks; i++)
{
if(IsMpegPacket(sectorData.Skip((int)(i * blockSize))))
return true;
}
return false;
}
public static bool IsMpegPacket(IEnumerable<byte> sector) =>
sector.Take(3).ToArray().SequenceEqual(_mpeg2PackHeaderStartCode);
#region Nested type: MpegHeader
public struct MpegHeader
{
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
@@ -94,15 +157,5 @@ public class MPEG
byte packStuffingLengthBlock;
}
public static bool ContainsMpegPackets(byte[] sectorData, uint blocks = 1, uint blockSize = 2048)
{
for(uint i = 0; i < blocks; i++)
if(IsMpegPacket(sectorData.Skip((int)(i * blockSize))))
return true;
return false;
}
public static bool IsMpegPacket(IEnumerable<byte> sector) =>
sector.Take(3).ToArray().SequenceEqual(_mpeg2PackHeaderStartCode);
#endregion
}