PureBasic

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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IncludeFile "CkPublicKey.pb"

Procedure ChilkatExample()

    success.i = 0

    ;  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).

    pubKey.i = CkPublicKey::ckCreate()
    If pubKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ;  The Base64 of the DER-encoded public key.
    keyStr.s = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA...IDAQAB"

    success = CkPublicKey::ckLoadBase64(pubKey,keyStr)
    If success = 0
        Debug CkPublicKey::ckLastErrorText(pubKey)
        CkPublicKey::ckDispose(pubKey)
        ProcedureReturn
    EndIf

    Debug "Loaded a " + CkPublicKey::ckKeyType(pubKey) + " public key."


    CkPublicKey::ckDispose(pubKey)


    ProcedureReturn
EndProcedure