Пример формирования подписи на .net (c#)

string privateKey = @"-----BEGIN PGP PRIVATE KEY BLOCK-----
Version: BCPG C# v1.7.4114.6375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=K+kP
-----END PGP PRIVATE KEY BLOCK-----
";
string privateKeyPassword = "1234567";


string signText = String.Format("serviceId=2::serviceOperationId=987");
var sign = PGPHelper.SignString(privateKey, privateKeyPassword, signText, true, false);
/*
-----BEGIN+PGP+SIGNATURE-----iKYEAQEBABAFAlXgbSQJHGJlemJhbmthAAoJEFsS9GEnwozuMXkD/Rs0pdBZAYJA
R2TZ4jxs0WVDIeR5hBOOFhYNVj9y0hOkJX4zGSBrLISX60EQy2Cr5jZGn1woqBzE
2/qnWP3L14kF6NneQLkRZS+f6+dLoz/V0P8E5y83SokucknsnAqq9WITi6msc0ZM
e+sbfVTKGetXEXnqDa9Xu5NCGe2Aok7T
=bDzy
*/