/// <summary>
/// Returns a specific secret key in the keyring.
/// </summary>
/// <param name="openPgp">The <see cref="IOpenPgp"/> implementation.</param>
/// <param name="keySpecifier">The key ID, fingerprint or any part of a user ID that identifies the keypair; <c>null</c> to use the default key.</param>
/// <exception cref="KeyNotFoundException">The specified key could not be found on the system.</exception>
/// <seealso cref="IOpenPgp.Sign"/>
/// <seealso cref="IOpenPgp.ExportKey"/>
public static OpenPgpSecretKey GetSecretKey(this IOpenPgp openPgp, string?keySpecifier = null)
{
#region Sanity checks
if (openPgp == null)
{
throw new ArgumentNullException(nameof(openPgp));
}
#endregion
var secretKeys = openPgp.ListSecretKeys().ToList();
if (secretKeys.Count == 0)
{
throw new KeyNotFoundException(Resources.UnableToFindSecretKey);
}
if (string.IsNullOrEmpty(keySpecifier))
{
return(secretKeys[0]);
}
try
{
long keyID = OpenPgpUtils.ParseKeyID(keySpecifier);
return(secretKeys.First(x => x.KeyID == keyID));
}
catch (FormatException)
{}
catch (InvalidOperationException)
{}
try
{
var fingerprint = OpenPgpUtils.ParseFingerprint(keySpecifier);
return(secretKeys.First(x => x.Fingerprint.SequenceEqual(fingerprint)));
}
catch (FormatException)
{}
catch (InvalidOperationException)
{}
try
{
return(secretKeys.First(x => x.UserID.ContainsIgnoreCase(keySpecifier)));
}
catch
{
throw new KeyNotFoundException(Resources.UnableToFindSecretKey);
}
}
/// <summary>
/// Parses information about a signature from a console line.
/// </summary>
/// <param name="line">The console line containing the signature information.</param>
/// <returns>The parsed signature representation; <c>null</c> if <paramref name="line"/> did not contain any signature information.</returns>
/// <exception cref="FormatException"><paramref name="line"/> contains incorrectly formatted signature information.</exception>
private static OpenPgpSignature?ParseSignatureLine(string line)
{
const int signatureTypeIndex = 1, fingerprintIndex = 2, timestampIndex = 4, keyIDIndex = 2, errorCodeIndex = 7;
var signatureParts = line.Split(' ');
if (signatureParts.Length < signatureTypeIndex + 1)
{
return(null);
}
switch (signatureParts[signatureTypeIndex])
{
case "VALIDSIG":
if (signatureParts.Length != 12)
{
throw new FormatException("Incorrect number of columns in VALIDSIG line.");
}
var fingerprint = OpenPgpUtils.ParseFingerprint(signatureParts[fingerprintIndex]);
return(new ValidSignature(
keyID: OpenPgpUtils.FingerprintToKeyID(fingerprint),
fingerprint: fingerprint,
timestamp: new UnixTime(long.Parse(signatureParts[timestampIndex]))));
case "BADSIG":
if (signatureParts.Length < 3)
{
throw new FormatException("Incorrect number of columns in BADSIG line.");
}
return(new BadSignature(OpenPgpUtils.ParseKeyID(signatureParts[keyIDIndex])));
case "ERRSIG":
if (signatureParts.Length != 8)
{
throw new FormatException("Incorrect number of columns in ERRSIG line.");
}
return(int.Parse(signatureParts[errorCodeIndex]) switch
{
9 => new MissingKeySignature(OpenPgpUtils.ParseKeyID(signatureParts[keyIDIndex])),
_ => new ErrorSignature(OpenPgpUtils.ParseKeyID(signatureParts[keyIDIndex]))
});