private static string BuildDataString(NameValuePair[] parameters)
{
if (parameters == null)
throw new ArgumentNullException("parameters");
var builder = new StringBuilder();
var orderedParameters = parameters
.Where(p => string.IsNullOrEmpty(p.Name) && !string.IsNullOrEmpty(p.Value))
.Union(parameters
.Where(p => !string.IsNullOrEmpty(p.Name) && !string.IsNullOrEmpty(p.Value))
.OrderBy(i => i.Name)
)
.ToList();
foreach (var parameter in orderedParameters)
{
if (builder.Length > 0)
builder.Append(ParameterSeparator);
if (!string.IsNullOrEmpty(parameter.Name))
{
builder.Append(parameter.Name);
builder.Append(NameValueSeparator);
}
builder.Append(parameter.Value);
}
var data = builder.ToString();
return data;
}
public static string GetHashString(Func<byte[], HMAC> hmacFactory, string secretKey, NameValuePair[] parameters)
{
var data = BuildDataString(parameters);
return ComputeHash(hmacFactory, secretKey, data);
}