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C# Import or Export Cert to Base64 String
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public void ExportCertToBase64() | |
{ | |
var certificate = new System.Security.Cryptography.X509Certificates.X509Certificate2("c:\\temp\\Signing Cert.pfx", "XXXXXXXXXXXXXX", X509KeyStorageFlags.Exportable); | |
StringBuilder builder = new StringBuilder(); | |
builder.AppendLine("-----BEGIN CERTIFICATE-----"); | |
builder.AppendLine(Convert.ToBase64String(certificate.Export(X509ContentType.Pkcs12, "XXXXXXXXXXXXXX"), Base64FormattingOptions.InsertLineBreaks)); | |
builder.AppendLine("-----END CERTIFICATE-----"); | |
Console.WriteLine( builder.ToString()); | |
} | |
public void ImportCertFromBase64() | |
{ | |
var rawSIgningCert = @" | |
-----BEGIN CERTIFICATE----- | |
MIIDLzCCAhegAwIBAgIQJAw....... | |
-----END CERTIFICATE----- | |
"; | |
var certBytes = Encoding.UTF8.GetBytes(rawSIgningCert); | |
var signingcert = new System.Security.Cryptography.X509Certificates.X509Certificate2( | |
certBytes, "XXXXXXXXXXXXXX", | |
System.Security.Cryptography.X509Certificates.X509KeyStorageFlags.Exportable); | |
} | |
const string certificatePem = @"
-----BEGIN CERTIFICATE-----
MIIF8DCCBVmgAwIBAgIKYFOB9QABAACIvTANBgkqhkiG9w0BAQUFADBGMQswCQYD
...
OpueYUG3NBcHP/5IzhUYIQJbGzlQaUaZBMaQeC8ZslMNLWI2
-----END CERTIFICATE-----";
var pemData = Regex.Replace(Regex.Replace(certificatePem, @"\s+", string.Empty), @"-+[^-]+-+", string.Empty);
var pemBytes = Convert.FromBase64String(pemData);
return new X509Certificate2(pemBytes);
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The only way I could get this to work was by using "Convert.FromBase64String" instead of "Encoding.UTF8.GetBytes". I also had to parse out the "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----" text from the "rawSIgningCert" field because Convert.FromBase64String chokes on non-base64 characters like the hyphen otherwise. After making those changes, this solution worked great.