private static ProofKeyOutput GetProofData(ProofKeyInput proofData)
{
if (proofData.AccessToken == null)
{
throw new ProofKeySigningException(nameof(proofData.AccessToken));
}
// Get the final values we'll operate on
string accessToken = proofData.AccessToken;
string hostUrl = proofData.Url.ToUpperInvariant();
long timeStamp = proofData.Timestamp;
// Encode values from headers into byte[]
byte[] accessTokenBytes = Encoding.UTF8.GetBytes(accessToken);
byte[] hostUrlBytes = Encoding.UTF8.GetBytes(hostUrl);
byte[] timeStampBytes = EncodeNumber(timeStamp);
int accessTokenLength = accessTokenBytes.Length;
int hostUrlLength = hostUrlBytes.Length;
int timeStampLength = timeStampBytes.Length;
byte[] accessTokenLengthBytes = EncodeNumber(accessTokenLength);
byte[] hostUrlLengthBytes = EncodeNumber(hostUrlLength);
byte[] timeStampLengthBytes = EncodeNumber(timeStampLength);
// prepare a list that will be used to combine all those arrays together
List <byte> expectedProof = new List <byte>(
accessTokenLengthBytes.Length + accessTokenLength +
hostUrlLengthBytes.Length + hostUrlLength +
timeStampLengthBytes.Length + timeStampLength);
expectedProof.AddRange(accessTokenLengthBytes);
expectedProof.AddRange(accessTokenBytes);
expectedProof.AddRange(hostUrlLengthBytes);
expectedProof.AddRange(hostUrlBytes);
expectedProof.AddRange(timeStampLengthBytes);
expectedProof.AddRange(timeStampBytes);
// create another byte[] from that list
byte[] preSigningBytes = expectedProof.ToArray();
return(new ProofKeyOutput(
accessToken,
accessTokenBytes,
accessTokenLength,
accessTokenLengthBytes,
hostUrl,
hostUrlBytes,
hostUrlLength,
hostUrlLengthBytes,
timeStamp,
timeStampBytes,
timeStampLength,
timeStampLengthBytes,
preSigningBytes));
}
public static ProofKeyOutput GetSignedProofData(ProofKeyInput proofData, RSACryptoServiceProvider rsaAlg)
{
ProofKeyOutput output = GetProofData(proofData);
using (SHA256CryptoServiceProvider hashAlg = new SHA256CryptoServiceProvider())
{
byte[] signedProofBytes = rsaAlg.SignData(output.PreSigningBytes, hashAlg);
output.SignedBase64ProofKey = Convert.ToBase64String(signedProofBytes);
return(output);
}
}
