public static byte[] ScrambledParcel(this SKR1Parcel parcel, byte[] iv, byte[] key)
{
ArgumentThrow.IfNull(parcel, $"Invalid {typeof(SKR1Parcel).Name} to scramble. Parcel can not be null.", nameof(parcel));
ArgumentThrow.IfLengthNot(iv, 16, "Invalid iv to scramble. IV buffer should be 16 bytes.", nameof(iv));
ArgumentThrow.IfLengthNot(key, 16, "Invalid key to scramble. Key buffer should be 16 bytes.", nameof(key));
using (var aes = Aes.Create())
{
aes.IV = iv;
aes.Key = key;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
using (var encryptor = aes.CreateEncryptor())
using (var memoryStream = new MemoryStream())
using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(parcel.Binary);
return(memoryStream.ToArray());
}
}
}
private async Task <IEnumerable <TLLVSlab> > GenerateCKC(DFunction derivator, IEnumerable <TLLVSlab> spcSlabs, object info)
{
var ckcSlabs = new List <TLLVSlab>();
byte[] DASk = null;
try { DASk = derivator.DeriveBytes(spcSlabs.First(p => p.Tag.Same(TLLVTag.Id.R2)).Payload <R2Payload>().R2); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0014", "Unable to process SPC. See 'innerException' for more information.", ex); }
SKR1Payload SessionRandom1Payload = null;
try { SessionRandom1Payload = spcSlabs.First(p => p.Tag.Same(TLLVTag.Id.SKR1)).Payload <SKR1Payload>(); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0015", "Unable to process SPC. See 'innerException' for more information.", ex); }
SKR1IntegrityPayload SessionRandom1IntegrityPayload = null;
try { SessionRandom1IntegrityPayload = spcSlabs.First(p => p.Tag.Same(TLLVTag.Id.SKR1Integrity)).Payload <SKR1IntegrityPayload>(); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0016", "Unable to process SPC. See 'innerException' for more information.", ex); }
SKR1Parcel SessionRandom1Parcel = null;
try { SessionRandom1Parcel = new SKR1Parcel(new ReadOnlyMemory <byte>(SessionRandom1Payload.UnscrambledParcel(DASk))); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0017", "Unable to process SPC. See 'innerException' for more information.", ex); }
if (Enumerable.SequenceEqual(SessionRandom1Parcel.Integrity, SessionRandom1IntegrityPayload.Integrity) == false)
{
throw new FPContextIntegrityViolatedException("EXC_0034", "Unable to process SPC. SPC integrity violated.");
}
TRRPayload TagReturnRequestPayload = null;
try { TagReturnRequestPayload = spcSlabs.First(p => p.Tag.Same(TLLVTag.Id.TRR)).Payload <TRRPayload>(); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0018", "Unable to process SPC. See 'innerException' for more information.", ex); }
ckcSlabs.AddRange(spcSlabs.Where(slab => TagReturnRequestPayload.TRR.Select(tag => tag.Code).Contains(slab.Tag.Code)));
AssetPayload AssetIdentifierPayload = null;
try { AssetIdentifierPayload = spcSlabs.First(p => p.Tag.Same(TLLVTag.Id.Asset)).Payload <AssetPayload>(); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0019", "Unable to process SPC. See 'innerException' for more information.", ex); }
IContentKey ContentKey = null;
try { ContentKey = await this.Locator.FetchContentKey(AssetIdentifierPayload.Identifier, info); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPKeyLocatorException("EXC_0020", "Unable to fetch content key from key locator. See 'innerException' for more information.", ex); }
if (ContentKey.IV == null || ContentKey.IV.Length != 16)
{
throw new FPInvalidKeyException("EXC_0035", "Invalid IV fetched from key locator. IV can not be null and should be 16 bytes length.");
}
if (ContentKey.Key == null || ContentKey.Key.Length != 16)
{
throw new FPInvalidKeyException("EXC_0036", "Invalid key fetched from key locator. Key can not be null and should be 16 bytes length.");
}
EncryptedCKParcel EncryptedContentKeyParcel = null;
try { EncryptedContentKeyParcel = new EncryptedCKParcel(ContentKey.Key); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0021", "Unable to process SPC. See 'innerException' for more information.", ex); }
EncryptedCKPayload EncryptedContentKeyPayload = null;
try { EncryptedContentKeyPayload = new EncryptedCKPayload(ContentKey.IV, EncryptedContentKeyParcel.ScrambledParcel(SessionRandom1Parcel.SK)); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0022", "Unable to process SPC. See 'innerException' for more information.", ex); }
TLLVSlab EncryptedContentKeySlab = null;
try { EncryptedContentKeySlab = new TLLVSlab(TLLVTag.Id.EncryptedCK, EncryptedContentKeyPayload.Binary); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0023", "Unable to process SPC. See 'innerException' for more information.", ex); }
ckcSlabs.Add(EncryptedContentKeySlab);
R1Payload Random1Payload = null;
try { Random1Payload = new R1Payload(SessionRandom1Parcel.R1); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0024", "Unable to process SPC. See 'innerException' for more information.", ex); }
TLLVSlab Random1Slab = null;
try { Random1Slab = new TLLVSlab(TLLVTag.Id.R1, Random1Payload.Binary); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0025", "Unable to process SPC. See 'innerException' for more information.", ex); }
ckcSlabs.Add(Random1Slab);
TLLVSlab MediaPlaybackSlab = null;
try { MediaPlaybackSlab = spcSlabs.FirstOrDefault(p => p.Tag.Same(TLLVTag.Id.MediaPlayback)); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0026", "Unable to process SPC. See 'innerException' for more information.", ex); }
if (MediaPlaybackSlab != null)
{
MediaPlaybackPayload MediaPlaybackPayload = null;
try { MediaPlaybackPayload = MediaPlaybackSlab.Payload <MediaPlaybackPayload>(); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0027", "Unable to process SPC. See 'innerException' for more information.", ex); }
if (MediaPlaybackPayload.CreationDate < DateTime.UtcNow.AddHours(-6))
{
throw new FPContextDateViolatedException("EXC_0036", "Unable to process SPC. Date range violated.");
}
if (MediaPlaybackPayload.CreationDate > DateTime.UtcNow.AddHours(6))
{
throw new FPContextDateViolatedException("EXC_0037", "Unable to process SPC. Date range violated.");
}
DurationCKPayload DurationContentKeyPayload = null;
try { DurationContentKeyPayload = new DurationCKPayload((UInt32)this.LicenseDuration, 0, DurationCKType.Rental); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0028", "Unable to process SPC. See 'innerException' for more information.", ex); }
TLLVSlab DurationContentKeySlab = null;
try { DurationContentKeySlab = new TLLVSlab(TLLVTag.Id.DurationCK, DurationContentKeyPayload.Binary); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0029", "Unable to process SPC. See 'innerException' for more information.", ex); }
ckcSlabs.Add(DurationContentKeySlab);
}
TLLVSlab CapabilitiesSlab = null;
try { CapabilitiesSlab = spcSlabs.FirstOrDefault(p => p.Tag.Same(TLLVTag.Id.Capabilities)); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0030", "Unable to process SPC. See 'innerException' for more information.", ex); }
if (CapabilitiesSlab != null)
{
// Send HDCPEnforcementSlab
CapabilitiesPayload CapabilitiesPayload = null;
try { CapabilitiesPayload = CapabilitiesSlab.Payload <CapabilitiesPayload>(); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0031", "Unable to process SPC. See 'innerException' for more information.", ex); }
if (CapabilitiesPayload.HasCapability(LowCapabilities.HDCPEnforcement))
{
HDCPEnforcementPayload HDCPEnforcementPayload = null;
try { HDCPEnforcementPayload = new HDCPEnforcementPayload(HDCPTypeRequierement.HDCPType0Required); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0032", "Unable to process SPC. See 'innerException' for more information.", ex); }
TLLVSlab HDCPEnforcementSlab = null;
try { HDCPEnforcementSlab = new TLLVSlab(TLLVTag.Id.HDCPEnforcement, HDCPEnforcementPayload.Binary); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_0033", "Unable to process SPC. See 'innerException' for more information.", ex); }
ckcSlabs.Add(HDCPEnforcementSlab);
}
}
return(ckcSlabs);
}
private IContentKey FetchKey(FPProvider provider, SPCMessage spc, CKCMessage ckc)
{
IEnumerable <TLLVSlab> spcSlabs = null;
try { spcSlabs = TLLVSlab.FromBuffer(spc.UnscrambledPayload(provider.RSAKey)); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_2010", "Unable to process inspection. See 'innerException' for more information.", ex); }
byte[] DASk = null;
try { DASk = new DFunction(provider.ASKey).DeriveBytes(spcSlabs.First(p => p.Tag.Same(TLLVTag.Id.R2)).Payload <R2Payload>().R2); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_2011", "Unable to process inspection. See 'innerException' for more information.", ex); }
SKR1Payload SessionRandom1Payload = null;
try { SessionRandom1Payload = spcSlabs.First(p => p.Tag.Same(TLLVTag.Id.SKR1)).Payload <SKR1Payload>(); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_2012", "Unable to process inspection. See 'innerException' for more information.", ex); }
SKR1IntegrityPayload SessionRandom1IntegrityPayload = null;
try { SessionRandom1IntegrityPayload = spcSlabs.First(p => p.Tag.Same(TLLVTag.Id.SKR1Integrity)).Payload <SKR1IntegrityPayload>(); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_2013", "Unable to process inspection. See 'innerException' for more information.", ex); }
SKR1Parcel SessionRandom1Parcel = null;
try { SessionRandom1Parcel = new SKR1Parcel(new ReadOnlyMemory <byte>(SessionRandom1Payload.UnscrambledParcel(DASk))); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_2014", "Unable to process inspection. See 'innerException' for more information.", ex); }
if (Enumerable.SequenceEqual(SessionRandom1Parcel.Integrity, SessionRandom1IntegrityPayload.Integrity) == false)
{
throw new FPContextIntegrityViolatedException("EXC_0034", "Unable to process SPC. SPC integrity violated.");
}
byte[] seed = null;
try { seed = spcSlabs.First(s => s.Tag.Same(TLLVTag.Id.AR)).Payload <ARPayload>().Seed; }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_2015", "Unable to process inspection. See 'innerException' for more information.", ex); }
byte[] random = null;
try { random = SessionRandom1Parcel.R1; }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_2016", "Unable to process inspection. See 'innerException' for more information.", ex); }
byte[] key = null;
try {
using (var sha = SHA1.Create())
using (var aes = Aes.Create())
{
// aes.IV = new byte[16];
aes.Key = sha.ComputeHash(random).Take(16).ToArray();
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.None;
using (var encryptor = aes.CreateEncryptor())
using (var memoryStream = new MemoryStream())
using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(seed);
key = memoryStream.ToArray();
}
}
}
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_2017", "Unable to process inspection. See 'innerException' for more information.", ex); }
IEnumerable <TLLVSlab> ckcSlabs = null;
try { ckcSlabs = TLLVSlab.FromBuffer(ckc.UnscrambledPayload(key)); }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_2018", "Unable to process inspection. See 'innerException' for more information.", ex); }
byte[] SK = null;
try { SK = SessionRandom1Parcel.SK; }
catch (FPException) { throw; }
catch (Exception ex) { throw new FPInvalidContextException("EXC_2019", "Unable to process inspection. See 'innerException' for more information.", ex); }
return(FetchKey(spcSlabs, ckcSlabs, SK));
}
