private static bool Verify(byte[] signedaddon, out SignedAddonHeader header, out byte[] assembly)
{
using (var stream = new MemoryStream(signedaddon))
{
using (var reader = new BinaryReader(stream))
{
using (var rsaProvider = new RSACryptoServiceProvider(new CspParameters {
ProviderType = 1
}))
{
using (var sha1 = new SHA1CryptoServiceProvider())
{
rsaProvider.ImportCspBlob(Convert.FromBase64String(PublicKey));
var headerBuffer = reader.ReadBytes(Marshal.SizeOf(typeof(SignedAddonHeader)));
var assemblyBuffer = reader.ReadBytes(signedaddon.Length - headerBuffer.Length);
header = DeserializeStructure <SignedAddonHeader>(headerBuffer);
bool result;
switch (header.Data.SignatureVersion)
{
case "2":
const int signatureSize = 320;
var verifyBuffer = new byte[signedaddon.Length - signatureSize];
Array.Copy(signedaddon, signatureSize, verifyBuffer, 0, verifyBuffer.Length);
result = rsaProvider.VerifyData(verifyBuffer, sha1, header.Signature);
break;
default:
Log.Instance.DoLog("You are using an older version of the addon, support for older addons will be removed soon.");
result = rsaProvider.VerifyData(assemblyBuffer, sha1, header.Signature);
break;
}
if (result)
{
var key = CustomRsa.DecodeBlock(header.CryptoData.Key, new BigInteger(Exponent), new BigInteger(Modulus));
assembly = RijndaelHelper.Decrypt(assemblyBuffer, key, header.CryptoData.Salt, header.CryptoData.Iterations);
return(true);
}
}
}
}
}
assembly = null;
return(false);
}
internal static byte[] VerifyAndDecrypt(byte[] signedaddon)
{
SignedAddonHeader header;
byte[] encryptedAssembly = null;
using (var stream = new MemoryStream(signedaddon))
{
using (var reader = new BinaryReader(stream))
{
var headerBuffer = reader.ReadBytes(Marshal.SizeOf(typeof(SignedAddonHeader)));
var assemblyBuffer = reader.ReadBytes(signedaddon.Length - headerBuffer.Length);
var gcHandle = GCHandle.Alloc(headerBuffer, GCHandleType.Pinned);
header = (SignedAddonHeader)Marshal.PtrToStructure(gcHandle.AddrOfPinnedObject(), typeof(SignedAddonHeader));
gcHandle.Free();
var cspParams = new CspParameters {
ProviderType = 1
};
using (var rsaProvider = new RSACryptoServiceProvider(cspParams))
{
rsaProvider.ImportCspBlob(Convert.FromBase64String(PublicKey));
using (var sha1 = new SHA1CryptoServiceProvider())
{
if (rsaProvider.VerifyData(assemblyBuffer, sha1, header.Signature))
{
encryptedAssembly = assemblyBuffer;
}
}
}
}
}
if (encryptedAssembly != null)
{
var key = CustomRsa.DecodeBlock(header.CryptoData.Key, new BigInteger(Exponent), new BigInteger(Modulus));
return(RijndaelHelper.Decrypt(encryptedAssembly, key, header.CryptoData.Salt, header.CryptoData.Iterations));
}
return(null);
}