Visual Basic 6.0

Load EC Public Key from X,Y Values

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Demonstrates how to load an EC public key from X and Y values. Visual Basic 6.0

Dim success As Long
success = 0

' We have the following x and y values in base64 (for an EC point on the P-256 curve).
Dim x As String
x = "Dn7uB1O7kgk74G6qfQwFJESeDnxO6lLjGZFWZJE16tw"
Dim y As String
y = "iOWA5DInzK6nuUGvHJbMVq1Dpj248FqSV2teN3HzmhU"

' Build a JWK that looks like this:

' {
'   "kty": "EC",
'   "crv": "P-256",
'   "x": "Dn7uB1O7kgk74G6qfQwFJESeDnxO6lLjGZFWZJE16tw",
'   "y": "iOWA5DInzK6nuUGvHJbMVq1Dpj248FqSV2teN3HzmhU"
' }

Dim json As New ChilkatJsonObject
success = json.UpdateString("kty","EC")
success = json.UpdateString("crv","P-256")
success = json.UpdateString("x",x)
success = json.UpdateString("y",y)

' Load from the JWK.
Dim pubkey As New PublicKey
success = pubkey.LoadFromString(json.Emit())
If (success = 0) Then
    Debug.Print pubkey.LastErrorText
    Exit Sub
End If

Debug.Print "Success."