(VB.NET UWP/WinRT) Create JCEKS Containing Secret Keys

Demonstrates how to create a JCEKS keystore file containing symmetric secret keys (for AES, Blowfish, HMAC SHA25, ChaCha20, etc.)

This example requires Chilkat v9.5.0.66 or greater.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' IMPORTANT: This example requires Chilkat v9.5.0.66 or greater.

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

Dim jceks As New Chilkat.JavaKeyStore


' We'll need a pseudo-random number generator (PRNG) to generate symmetric keys.
Dim prng As New Chilkat.Prng

' Generate some keys..

' 128-bit AES key (16 bytes)
Dim aesKey As String = prng.GenRandom(16,"base64")

' 256-bit Blowfish key (32 bytes)
Dim blowfishKey As String = prng.GenRandom(32,"base64")

' HMAC SHA256 key
' (An HMAC key can be anything, and any length. We'll use the following string:
Dim hmacKey As String = "This is my HMAC key"

' ChaCha20 256-bit
Dim chachaKey As String = prng.GenRandom(32,"base64")


' Add each secret key to the JCEKS
Dim encoding As String = "base64"
Dim password As String = "secret"
jceks.AddSecretKey(aesKey,encoding,"AES","my aes key",password)
jceks.AddSecretKey(blowfishKey,encoding,"BLOWFISH","my blowfish key",password)
' For HMAC, we're using the us-ascii bytes for the key..
jceks.AddSecretKey(hmacKey,"ascii","HMAC_SHA256","my hmac key",password)
jceks.AddSecretKey(chachaKey,encoding,"CHACHA","my chacha20 key",password)

Dim filePassword As String = "password"
' Write the JCEKs to a file.
Dim success As Boolean = jceks.ToFile(filePassword,"qa_output/secretKeys.jceks")
If (success <> True) Then
    Debug.WriteLine(jceks.LastErrorText)
    Exit Sub
End If


' We can also emit as a JWK Set..
Dim sbJson As New Chilkat.StringBuilder
success = jceks.ToJwkSet("secret",sbJson)
If (success <> True) Then
    Debug.WriteLine(jceks.LastErrorText)
    Exit Sub
End If


' Emit the JSON in pretty-printed (indented) form:
Dim json As New Chilkat.JsonObject
json.LoadSb(sbJson)
json.EmitCompact = False
Debug.WriteLine(json.Emit())

' Output is:

' { 
'   "keys": [
'     { 
'       "kty": "oct",
'       "alg": "AES",
'       "k": "vHekQQB0Gc1NvppapUTW2g",
'       "kid": "my aes key"
'     },
'     { 
'       "kty": "oct",
'       "alg": "BLOWFISH",
'       "k": "qHsdXaJsXicVCZbK8l8hJQpYOa0GkiO9gsRK9WLtht8",
'       "kid": "my blowfish key"
'     },
'     { 
'       "kty": "oct",
'       "alg": "HMAC_SHA256",
'       "k": "VGhpcyBpcyBteSBITUFDIGtleQ",
'       "kid": "my hmac key"
'     },
'     { 
'       "kty": "oct",
'       "alg": "CHACHA",
'       "k": "yNv832U43C9BcWvaQAH2_rG-GwfmpgT5JBRllWGQY1o",
'       "kid": "my chacha20 key"
'     }
'   ]
' }
'