public GetQuoteResponse(UInt32 i_error_code, RSACryptoServiceProvider i_public_key)
{
error_code = i_error_code;
public_key = i_public_key;
pcr_info = new byte[25];
pcr_info[0] = 0;
pcr_info[1] = 3;
pcr_info[2] = 0;
pcr_info[3] = 0;
pcr_info[4] = 14;
if (CommonParams.loaderHash.Length == 40 && CommonParams.appHash.Length == 40)
{
SHA1Managed hasher = new SHA1Managed();
byte[] encoded_public_key = CommonRoutines.EncodePublicKey(public_key);
byte[] pcr17 = GetExpectedPCR17();
byte[] pcr18 = GetZeroPCR();
byte[] pcr19 = GetExpectedPCR19(hasher, encoded_public_key);
byte[] tpm_pcr_composite = CommonRoutines.CombineByteArrays(pcr_info.Take(5).ToArray(), BitConverter.GetBytes((UInt32)60), pcr17, pcr18, pcr19);
byte[] h1 = hasher.ComputeHash(tpm_pcr_composite);
Array.Copy(h1, 0, pcr_info, 5, 20);
}
sig = new byte[1];
sig[0] = 0;
}
private void CheckPCRInfo(byte[] pcr_info, byte[] encoded_public_key)
{
if (pcr_info[0] != 0 || pcr_info[1] != 3 || pcr_info[2] != 0 || pcr_info[3] != 0 || pcr_info[4] != 14)
{
throw new Exception("Invalid PCR selection in PCR info");
}
if (CommonParams.loaderHash.Length != 40 || CommonParams.appHash.Length != 40)
{
Console.Error.WriteLine("Skipping TPM composite hash check because loader hash and app hash weren't supplied");
return;
}
SHA1Managed hasher = new SHA1Managed();
byte[] pcr17 = GetExpectedPCR17();
byte[] pcr18 = GetZeroPCR();
byte[] pcr19 = GetExpectedPCR19(hasher, encoded_public_key);
byte[] tpm_pcr_composite = CommonRoutines.CombineByteArrays(pcr_info.Take(5).ToArray(), BitConverter.GetBytes((UInt32)60), pcr17, pcr18, pcr19);
byte[] h1 = hasher.ComputeHash(tpm_pcr_composite);
byte[] received_h1 = pcr_info.Skip(5).Take(20).ToArray();
if (!h1.SequenceEqual(received_h1))
{
throw new Exception("Composite hash in received PCR info not what was expected");
}
}
public byte[] Encode()
{
byte[] header = new byte[1];
header[0] = 1;
byte[] error_code = CommonRoutines.EncodeBEWord(0);
byte[] encoded_public_key = CommonRoutines.EncodePublicKey(public_key);
byte[] encoded_public_key_length = CommonRoutines.EncodeBEWord((uint)encoded_public_key.Length);
byte[] pcr_info_length = CommonRoutines.EncodeBEWord((uint)pcr_info.Length);
byte[] sig_length = CommonRoutines.EncodeBEWord((uint)sig.Length);
return(CommonRoutines.CombineByteArrays(header, error_code, encoded_public_key_length, pcr_info_length, sig_length, encoded_public_key, pcr_info, sig));
}
private byte[] ExtendPCR(SHA1Managed hasher, byte[] currentValue, byte[] valueToExtendBy)
{
return(hasher.ComputeHash(CommonRoutines.CombineByteArrays(currentValue, valueToExtendBy)));
}
