(Visual Basic 6.0) Generate an RSA Key and Save to Encrypted PEM

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Demonstrates how to generate an RSA key and save to an encrypted PEM file.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim rsa As New ChilkatRsa

' Generate a 2048-bit key.
Dim success As Long
success = rsa.GenerateKey(2048)
If (success = 0) Then
    Debug.Print rsa.LastErrorText
    Exit Sub
End If

Dim privKey As PrivateKey
Set privKey = rsa.ExportPrivateKeyObj()
Dim password As String
password = "secret"
' Saving to a relative path (from the current working directory of the process).
Dim path As String
path = "rsaKeys/myTestRsaPrivate.pem"
' Encrypt the PEM using 256-bit AES encryption.
privKey.Pkcs8EncryptAlg = "aes256"
success = privKey.SavePkcs8EncryptedPemFile(password,path)
If (success = 0) Then
    Debug.Print privKey.LastErrorText
    Exit Sub
End If

' 

' We can also save the public key.
' There is no need to encrypt public keys.
Dim pubKey As PublicKey
Set pubKey = rsa.ExportPublicKeyObj()
path = "rsaKeys/myTestRsaPublic.pem"
' Choose PKCS1 or PKCS8
' We'll choose PKCS8.
Dim preferPkcs1 As Long
preferPkcs1 = 0
success = pubKey.SavePemFile(preferPkcs1,path)
If (success = 0) Then
    Debug.Print pubKey.LastErrorText
    Exit Sub
End If

' 

Debug.Print "Success."