B4X Requires Chilkat v11.0.0+

Working with PEM Encrypted Private Keys

See more PEM Examples

Demonstrates how to load and save PEM encrypted private keys. B4X

Dim success As Boolean = False

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

success = False

Dim pem As ChilkatPem
pem.Initialize

Dim pemPassword As String = "secret"

'  To load a PEM file containing encrypted private keys, simply
'  provide the password.
success = pem.LoadPemFile("/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem", pemPassword)
If success = False Then
    Log(pem.LastErrorText)
    Return
End If


Dim fac As ChilkatFileAccess
fac.Initialize
Dim pemText As String = fac.ReadEntireTextFile("/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem", pemPassword)

'  To load a PEM from a string, call LoadPem instead of LoadPemFile:
success = pem.LoadPem(pemText)
If success = False Then
    Log(pem.LastErrorText)
    Return
End If


'  A few notes:
'  The PEM may contain both private keys and certificates (or anything else).
'  The password is utilized for whatever content in the PEM is encrypted.  
'  It is OK to have both encrypted and non-encrypted content within a given PEM.

'  PEM private keys can be encrypted in different formats.  The LoadPem and LoadPemFile
'  methods automatically handle the different formats.
'  One format is PKCS8 and is indicated by this delimiter within the PEM:

'  -----BEGIN ENCRYPTED PRIVATE KEY-----
'  MIICoTAbBgkqhkiG9w0BBQMwDgQIfdD0zv24lgkCAggABIICgE0PdHJmRbNs6cBX
'  ...

'  Another format, we'll call "passphrase" looks like this in the PEM:
'  -----BEGIN RSA PRIVATE KEY-----
'  Proc-Type: 4,ENCRYPTED
'  DEK-Info: DES-EDE3-CBC,A4215544D11C5D0C
'  
'  paqy9XRexcSjurHfG0xhCaUD0HrvIdhuC0CbRxxxeMlkLaV6+uT80rBxt2AaibWG
'  ...

'  Show the bit length of each private key:
Dim i As Int
Dim numPrivateKeys As Int = pem.NumPrivateKeys
If numPrivateKeys = 0 Then
    Log((("Error: Expected the PEM to contain private keys.")))
    Return
End If

Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
For i = 1 To numPrivateKeys
    pem.PrivateKeyAt(i - 1, privKey)
    Log(i & ": " & privKey.BitLength & " bits")
Next