B4X

DSA Generate Key

See more DSA Examples

Generates a DSA public/private key pair and saves to PEM and DER file formats (both encrypted and non-encrypted).

An encrypted DSA PEM looks like this:

-----BEGIN DSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,9DAFD5C4CD62A5D0

QwDdp66sB0qKXQli7FbVcKL/eo3wu7kGRlV2sI8XbkNa1RTLiwnwTWDB0dqyWRQ8
...
Bx0HVfxKiNgCbL6BQEnYD+GOmMcckuj9Uhgloe/YuXCIDJBGhjUt/li3hvR/PXeC

V2xxNl1XKBE88njqi+UXt4vjGVNLpvXM
-----END DSA PRIVATE KEY-----

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

'  Call GenKey to generate a new DSA key.
'  The number of bits should be at least 1024 and a multiple
'  of 64.   Typical values are either 1024 or 2048.
'  DSA key generation is compute intensive and may take
'  a short while to complete.
success = dsa.GenKey(2048)
If success <> True Then
    Log(dsa.LastErrorText)
    Return
End If


'  Extract the private and public parts to PEM or DER format
'  and save to 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(xmlStr, "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(xmlStr, "dsa_priv.xml")

Log("Finished!")