Xojo Plugin

Convert Let's Encrypt PEM Files to a PFX

See more PFX/P12 Examples

Demonstrates how to convert the .pem files provided by Let's Encrypt to a single PFX. Xojo Plugin

Dim success As Boolean
success = False

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Let's Encrypt provides four .pem files
// 1. fullchain.pem
// 2. privkey.pem
// 3. cert.pem
// 4. chain.pem

// The cert.pem and chain.pem are redundant. 
// The fullchain.pem is composed of the cert.pem and chain.pem.

// To convert the PEM's to a single .pfx, we don't need the redundant data.
// The privkey.pem and fullchain.pem provide the required data.
// We can ignore cert.pem and chain.pem (because those certs are already found in fullchain.pem).

// We need a single .pem file that contains both the private key, the cert,
// and the certs in the chain of authentication.
// Let's combine priveky.pem and fullchain.pem into a single .pem

Dim sbPem As New Chilkat.StringBuilder
success = sbPem.LoadFile("qa_data/pem/lets_encrypt/privkey.pem","utf-8")
If (success = False) Then
    System.DebugLog("Failed to load privkey.pem")
    Return
End If

// To be safe, append a blank line..
success = sbPem.AppendLine("",False)

Dim sbFullChainPem As New Chilkat.StringBuilder
success = sbFullChainPem.LoadFile("qa_data/pem/lets_encrypt/fullchain.pem","utf-8")
If (success = False) Then
    System.DebugLog("Failed to load fullchain.pem")
    Return
End If

// Append the full cert chain PEM to the private key PEM.
success = sbPem.AppendSb(sbFullChainPem)

// Load the combined PEM into a Chilkat PFX object.
Dim pfx As New Chilkat.Pfx
success = pfx.LoadPem(sbPem.GetAsString(),"no password required")
If (success = False) Then
    System.DebugLog(pfx.LastErrorText)
    Return
End If

// Write the PFX w/ a password.
Dim pfxPassword As String
pfxPassword = "secret"
success = pfx.ToFile(pfxPassword,"qa_output/sample.pfx")
If (success = False) Then
    System.DebugLog(pfx.LastErrorText)
    Return
End If

System.DebugLog("Success!")