B4X

Load a Public Key from Base64 DER

Demonstrates the Chilkat PublicKey.LoadBase64 method, which loads a public key from standard Base64-encoded DER. The only argument is the Base64 string; whitespace within it is permitted.

Background: A public key in DER (binary) form is often carried as Base64 text so it can travel through channels that expect a string — a config value, a JSON field, a certificate export. This loader decodes that text and inspects the DER to determine the key type and structure automatically. It is the plain-Base64 counterpart to loading a full PEM block, which additionally has the BEGIN/END armor.

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Dim success As Boolean = False

'  Demonstrates the PublicKey.LoadBase64 method, which loads a public key from standard
'  Base64-encoded DER.  The only argument is the Base64 string (whitespace is allowed).

Dim pubKey As ChilkatPublicKey
pubKey.Initialize

'  The Base64 of the DER-encoded public key.
Dim keyStr As String = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA...IDAQAB"

success = pubKey.LoadBase64(keyStr)
If success = False Then
    Log(pubKey.LastErrorText)
    Return
End If


Log("Loaded a " & pubKey.KeyType & " public key.")