Visual Basic 6.0

Generate new DSA Key from OpenSSL Parameters File

See more DSA Examples

Generates a new DSA key from an OpenSSL-created parameters file (DER and PEM formats supported). Examples of using OpenSSL to create parameter files are shown here:

openssl dsaparam -outform DER 1024 <  seedData.txt >dsaparam.der

openssl dsaparam 1024 < seedData.txt >dsaparam.pem

Visual Basic 6.0

Dim success As Long
success = 0

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

Dim dsa As New ChilkatDsa

success = dsa.GenKeyFromParamsDerFile("dsaparam.der")
If (success <> 1) Then
    Debug.Print dsa.LastErrorText
    Exit Sub
End If

' To generate a key from PEM, call GenKeyFromParamsPem 
' (for an in-memory PEM string) or GenKeyFromParamsFilePem
' for a PEM file.

' The public and private keys may now be exported to PEM, DER,
' and XML formatted files.

Dim pemStr As String
Dim xmlStr As String

' First for the public key...
' The public key never needs to be encrypted.

' Save the public key in PEM format:
pemStr = dsa.ToPublicPem()
' This example will not check the return value of SaveText...
success = dsa.SaveText(pemStr,"dsa_pub.pem")

' Save the public key in DER format:
success = dsa.ToPublicDerFile("dsa_pub.der")

Dim bPublicOnly As Long
bPublicOnly = 1
' Save to XML
xmlStr = dsa.ToXml(bPublicOnly)
success = dsa.SaveText(pemStr,"dsa_pub.xml")

' ------------------------------------
' Now for the private key....
' ------------------------------------

' Unencrypted PEM:
pemStr = dsa.ToPem()
success = dsa.SaveText(pemStr,"dsa_priv.pem")

' Encrypted PEM:
pemStr = dsa.ToEncryptedPem("myPassword")
success = dsa.SaveText(pemStr,"dsa_privEncrypted.pem")

' DER:
success = dsa.ToDerFile("dsa_priv.der")

' XML:
bPublicOnly = 0
xmlStr = dsa.ToXml(bPublicOnly)
success = dsa.SaveText(pemStr,"dsa_priv.xml")

Debug.Print "Finished!"