/// <summary>
/// Encrypts a stream with a random symmetric key
/// </summary>
/// <param name="unencryptedStream">stream to encrypt</param>
/// <param name="publicKeyModulus">modulus of the RSA key to encrypt the symmetric key with</param>
/// <param name="publicKeyExponent">exponent of the RSA key to encrypt the symmetric key with</param>
/// <param name="symmetricEncryptionParameters">returns encrypted symmetric key and IV</param>
/// <returns>encrypted stream</returns>
private Stream EncryptStream(Stream unencryptedStream, string publicKeyModulus, string publicKeyExponent,
out SymmetricEncryptionParameters symmetricEncryptionParameters)
{
// generate a symmetric key
var aesProvider = new RijndaelManaged();
byte[] encodedSymmetricKey = Encoding.ASCII.GetBytes(Convert.ToBase64String(aesProvider.Key));
byte[] encodedSymmetricIV = Encoding.ASCII.GetBytes(Convert.ToBase64String(aesProvider.IV));
// encrypt the stream
var encryptedStream = new MemoryStream();
using (var aesEncryptor = aesProvider.CreateEncryptor())
using (var base64Enc = new CryptoStream(unencryptedStream, new ToBase64Transform(), CryptoStreamMode.Read))
using (var encrypted = new CryptoStream(base64Enc, aesEncryptor, CryptoStreamMode.Read))
{
encrypted.CopyTo(encryptedStream);
encryptedStream.Position = 0;
}
// create an RSA key
var parameters = new RSAParameters
{
Modulus = Util.DecodeHexString(publicKeyModulus),
Exponent = Util.DecodeHexString(publicKeyExponent)
};
var encryptionProvider = new RSACryptoServiceProvider();
encryptionProvider.ImportParameters(parameters);
// encrypt the symmetric key with the RSA key
byte[] encryptedSymmetricKey = encryptionProvider.Encrypt(encodedSymmetricKey, false);
byte[] encryptedSymmetricIV = encryptionProvider.Encrypt(encodedSymmetricIV, false);
symmetricEncryptionParameters = new SymmetricEncryptionParameters
{
Key = BitConverter.ToString(encryptedSymmetricKey).Replace("-", ""),
IV = BitConverter.ToString(encryptedSymmetricIV).Replace("-", "")
};
return(encryptedStream);
}
/// <summary>
/// Submits information about the uploaded document to the API
/// </summary>
private void UpdateDocumentStatusAfterFileUpload(int documentId, SymmetricEncryptionParameters encryptionParameters,
string fileName, string fileType, int fileSize,
PrinterSettings finishingOptions, OAuthToken userAccessToken)
{
using (var http = new HttpClient())
{
var message = new DocumentStatusMessage
{
IsSuccess = true,
Status = DocumentStatus.ClientUpload,
ClientUploadDocument = new FileUploadMessage
{
EncryptedSymmetricKey = encryptionParameters.Key,
EncryptedSymmetricIV = encryptionParameters.IV,
File = new FileInfoMessage
{
FriendlyName = fileName,
FileType = fileType,
FileSize = fileSize
},
PrintOptions = finishingOptions
}
};
var endpoint = ApiEndpoints.UpdateDocumentStatus.Replace("{document_id}", documentId.ToString(CultureInfo.InvariantCulture));
var requestContent = new StringContent(JsonConvert.SerializeObject(message), Encoding.UTF8, "application/json");
SignOAuthRequest(http, userAccessToken, HttpMethod.Post, endpoint);
var response = http.PostAsync(_apiUri.AbsoluteUri + endpoint, requestContent).Result;
if (response.StatusCode != HttpStatusCode.OK)
{
throw new BreezyApiException(
String.Format("Could not update document status.\r\nResponse status code: {0}.\r\nResponse: {1}",
response.StatusCode, response.Content.ReadAsStringAsync().Result));
}
}
}
