B4X

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

B4X

Dim success As Boolean = False

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

Dim dsa As ChilkatDsa
dsa.Initialize

success = dsa.GenKeyFromParamsDerFile("dsaparam.der")
If success <> True Then
    Log(dsa.LastErrorText)
    Return
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 Boolean = True
'  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 = False
xmlStr = dsa.ToXml(bPublicOnly)
success = dsa.SaveText(pemStr, "dsa_priv.xml")

Log("Finished!")