VB.NET

Generate CSR from Pre-Existing Private Key

See more CSR Examples

Demonstrates how to generate a Certificate Signing Request (CSR) from a pre-existing RSA private key.

Note: This example requires Chilkat v9.5.0.65 or greater.

VB.NET

Dim success As Boolean = False

' Note: Requires Chilkat v9.5.0.65 or greater.

' This requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim privKey As New Chilkat.PrivateKey

' Load the private key from a file.
' (Chilkat provides the ability to load private keys from many different
' formats and sources..)
success = privKey.LoadEncryptedPemFile("qa_data/rsa/privKey1.pem","password")
If (Not success) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


' Create the CSR object and set properties.
Dim csr As New Chilkat.Csr

' Specify the Common Name.  This is the only required property.
' For SSL/TLS certificates, this would be the domain name. 
' For email certificates this would be the email address. 
csr.CommonName = "mysubdomain.mydomain.com"

' Country Name (2 letter code)
csr.Country = "GB"

' State or Province Name (full name)
csr.State = "Yorks"

' Locality Name (eg, city)
csr.Locality = "York"

' Organization Name (eg, company)
csr.Company = "Internet Widgits Pty Ltd"

' Organizational Unit Name (eg, secion/division)
csr.CompanyDivision = "IT"

' Email address
csr.EmailAddress = "support@mydomain.com"

' Create the CSR using the private key.
Dim pemStr As String = csr.GenCsrPem(privKey)
If (csr.LastMethodSuccess <> True) Then
    Debug.WriteLine(csr.LastErrorText)
    Exit Sub
End If


' Save the CSR..
Dim fac As New Chilkat.FileAccess
fac.WriteEntireTextFile("qa_output/csr1.pem",pemStr,"utf-8",False)

' Show the CSR.
Debug.WriteLine(pemStr)

' Sample output:
' The CSR PEM can be checked here:
' https://www.networking4all.com/en/support/tools/csr+check/
' Copy-and-paste the PEM into the online CSR Decoding / CSR Verification form

' 	-----BEGIN CERTIFICATE REQUEST-----
' 	MIIC6jCCAdICAQAwgaQxITAfBgNVBAMMGG15c3ViZG9tYWluLm15ZG9tYWluLmNv
' 	bTELMAkGA1UEBhMCR0IxDjAMBgNVBAgMBVlvcmtzMQ0wCwYDVQQHDARZb3JrMSEw
' 	HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxCzAJBgNVBAsMAklUMSMw
' 	IQYJKoZIhvcNAQkBFhRzdXBwb3J0QG15ZG9tYWluLmNvbTCCASIwDQYJKoZIhvcN
' 	AQEBBQADggEPADCCAQoCggEBALnQ0un/wF8whk+gPuiAlf3qvx14jgAOV6Erm6EB
' 	H7WACPCpnKcm/8KP+7uoPiwRQaENhMeCgf45vcivl2p6aAn/spLXyEkXyw2d8wFb
' 	YYAGRkiz4Xf7ASJiKuwcOtORz+sSDzgtdfokHfXU1cYeFE2yQhSdLUY5fMn425+g
' 	KoEEsRSjSDe6AKru4+4iGNrLKd8pB9IA5/jOE139IkWlB9r5fEPD5bUTsgqXk9eb
' 	68O0gc712V2eZK07N24lDmFC4bIMTD4csDWocR5hFHXj7NX7c8sOBDcpEb9mPIk4
' 	elxubnhkfnjhOi4J3lDHcT/0ALnbLhf9LnaiKqs+5VcVZvECAwEAAaAAMA0GCSqG
' 	SIb3DQEBBQUAA4IBAQC0AETLIcP3foh5nbu2hVFS8uCUNZ5hEIR1eXmYZmZoBQq2
' 	26ZAoT4CZwixlggC+n7WvAXJ5Pzxpl4wLV4loTiQzaKPX1w0ERo5ZRwLy0n56oG2
' 	6QG+WTViT1C8rlgtVwkCFNOXr0kSSRs8FdaPllqKxK1hxYSL7zwNpumsk39F2cDt
' 	vhcekvH0V3BuGrQFm3dKN/0azW6GOod9+Vq4VzSyOe3kp15oxLBsZOFOu/REujcw
' 	Tzu2jt1asQKUm60CZ9wNHpYepR0Ww40uP1slbehEaFDa6V8b60/tlHHmBbJ4/fy5
' 	hJnYCvjzFz4O9VtT+JtP9ldRHWV3KpZ8ne3AjD+F
' 	-----END CERTIFICATE REQUEST-----