public static PemFormat Parse(string typeString)
{
var format = new PemFormat(typeString);
var knownFormat = GetKnownFormats().FirstOrDefault(x => x.Equals(format));
if (knownFormat == null)
{
throw new InvalidOperationException($"Unknown format: {typeString}");
}
return(knownFormat);
}
private static PemFormat ExtractFormat(string headerOrFooter, bool isFooter)
{
var beginOrEnd = isFooter ? "END" : "BEGIN";
var match = Regex.Match(headerOrFooter, $@"({beginOrEnd})\s+(?<format>[^-]+)", RegexOptions.IgnoreCase);
if (!match.Success)
{
throw new InvalidOperationException($"Unrecognized {beginOrEnd}: {headerOrFooter}");
}
return(PemFormat.Parse(match.Groups["format"].Value.Trim()));
}
private void Write(DerAsnType der, PemFormat format)
{
var derBytes = DerConvert.Encode(der);
var derBase64 = Convert.ToBase64String(derBytes);
var pem = new StringBuilder();
pem.Append(format.Header + "\n");
for (var i = 0; i < derBase64.Length; i += _maximumLineLength)
{
pem.Append(derBase64.Substring(i, Math.Min(_maximumLineLength, derBase64.Length - i)));
pem.Append("\n");
}
pem.Append(format.Footer + "\n");
using (var writer = new StreamWriter(_stream, _encoding, 4096, true))
writer.Write(pem.ToString());
}