/// <summary>
/// Creates the MD5 based on the metadata of an attachment
/// </summary>
/// <param name="name"></param>
/// <param name="comment"></param>
/// <param name="displayName"></param>
/// <param name="fileSize"></param>
/// <returns></returns>
public static byte[] HashAttachmentMetadata(
string name,
string comment,
string displayName,
long fileSize)
{
MD5Producer hashProducer = new MD5Producer();
StringBuilder sb = new StringBuilder(name.Trim());
sb.Append(comment.Trim());
sb.Append(displayName.Trim());
sb.Append(fileSize.ToString());
return(hashProducer.CalculateMD5(new MemoryStream(ASCIIEncoding.Default.GetBytes(sb.ToString()))));
}
public bool CompareDocHash(XmlDocument xmlDocument, byte[] oldDocHash, ref byte[] newDocHash)
{
if (!m_md5Producer.Md5ProviderDisabled)
{
string docContent = xmlDocument.OuterXml;
newDocHash = m_md5Producer.CalculateMD5(new MemoryStream(ASCIIEncoding.Default.GetBytes(docContent)));
if (oldDocHash.Length > 0 &&
newDocHash.Length > 0 &&
0 == m_md5Producer.CompareMD5(oldDocHash, newDocHash))
{
return(true);
}
}
return(false);
}