public static byte[] UnscrambledPayload(this SPCMessage message, RSAParameters parameters)
{
ArgumentThrow.IfNull(message, $"Invalid {typeof(SPCMessage).Name} to unscramble. Message can not be null.", nameof(message));
ArgumentThrow.IfNull(parameters, $"Invalid {typeof(SPCMessage).Name} to unscramble. {typeof(RSAParameters).Name} can not be null.", nameof(parameters));
using (var rsa = RSA.Create())
using (var aes = Aes.Create())
{
rsa.ImportParameters(parameters);
aes.IV = message.IV;
aes.Key = rsa.Decrypt(message.Key, RSAEncryptionPadding.OaepSHA1);
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
using (var decryptor = aes.CreateDecryptor())
using (var memoryStream = new MemoryStream())
using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(message.ContentPayload);
return(memoryStream.ToArray());
}
}
}
public FPExtractor(FPProvider provider)
{
ArgumentThrow.IfNull(provider, "Unable to create inspector. Provider can not be null.", nameof(provider));
this.Providers = new List <FPProvider>()
{
provider
};
}
internal static byte[] ToBuffer(IEnumerable <TLLVSlab> slabs)
{
ArgumentThrow.IfNull(slabs, $"Invalid slabs to serialize. Slab list can not be null.", nameof(slabs));
var memory = new MemoryStream();
foreach (var slab in slabs)
{
memory.Write(slab.Binary);
}
return(memory.ToArray());
}
public FPServer(FPProvider provider, IContentKeyLocator locator)
{
ArgumentThrow.IfNull(provider, "Unable to create server. Provider can not be null.", nameof(provider));
ArgumentThrow.IfNull(locator, "Unable to create server. Key locator can not be null.", nameof(locator));
this.Providers = new List <FPProvider>()
{
provider
};
this.Locator = locator;
this.LicenseDuration = 3600;
}
internal static IEnumerable <TLLVSlab> FromBuffer(byte[] buffer)
{
ArgumentThrow.IfNull(buffer, $"Invalid buffer to parse slabs. Buffer can not be null.", nameof(buffer));
var memory = new ReadOnlyMemory <byte>(buffer);
IList <TLLVSlab> slabs = new List <TLLVSlab>();
while (memory.Length > 0)
{
var slab = new TLLVSlab(memory);
slabs.Add(slab);
memory = memory.Slice((int)slab.Length);
}
return(slabs);
}
public static byte[] UnscrambledParcel(this SKR1Payload payload, byte[] key)
{
ArgumentThrow.IfNull(payload, $"Invalid {typeof(SKR1Payload).Name} to unscramble. Payload can not be null.", nameof(payload));
ArgumentThrow.IfLengthNot(key, 16, "Invalid key to unscramble. Key buffer should be 16 bytes.", nameof(key));
using (var aes = Aes.Create())
{
aes.IV = payload.IV;
aes.Key = key;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
using (var decryptor = aes.CreateDecryptor())
using (var memoryStream = new MemoryStream())
using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(payload.Parcel);
return(memoryStream.ToArray());
}
}
}
public static byte[] ScrambledParcel(this EncryptedCKParcel parcel, byte[] key)
{
ArgumentThrow.IfNull(parcel, $"Invalid {typeof(EncryptedCKParcel).Name} to scramble. Parcel can not be null.", nameof(parcel));
ArgumentThrow.IfLengthNot(key, 16, "Invalid key to scramble. Key buffer should be 16 bytes.", nameof(key));
using (var aes = Aes.Create())
{
// aes.IV = null;
aes.Key = key;
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(parcel.Binary);
return(memoryStream.ToArray());
}
}
}
