(PowerBuilder) Ed25519 Sign and Verify

Demonstrates how to create an Ed25519 signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.83 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
string ls_PrivKeyHex
string ls_PubKeyHex
oleobject loo_PrivKey
integer li_Success
oleobject loo_Bd
oleobject loo_Eddsa
string ls_HexSig
oleobject loo_PubKey
integer li_BVerified

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

ls_PrivKeyHex = "1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93"
ls_PubKeyHex = "b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde"

loo_PrivKey = create oleobject
// Use "Chilkat_9_5_0.PrivateKey" for versions of Chilkat < 10.0.0
li_rc = loo_PrivKey.ConnectToNewObject("Chilkat.PrivateKey")
if li_rc < 0 then
    destroy loo_PrivKey
    MessageBox("Error","Connecting to COM object failed")
    return
end if
// This example shows only one way of loading an Ed25519 private key.
// Chilkat can load other formats (JWK, PEM, ASN.1 DER, etc.)  
// You may do so by calling LoadAnyFormat or LoadAnyFormatFile.
li_Success = loo_PrivKey.LoadEd25519(ls_PrivKeyHex,ls_PubKeyHex)
if li_Success = 0 then
    Write-Debug loo_PrivKey.LastErrorText
    destroy loo_PrivKey
    return
end if

// The data to be signed...
loo_Bd = create oleobject
// Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
li_rc = loo_Bd.ConnectToNewObject("Chilkat.BinData")

loo_Bd.AppendString("Message for Ed25519 signing","utf-8")

loo_Eddsa = create oleobject
// Use "Chilkat_9_5_0.EdDSA" for versions of Chilkat < 10.0.0
li_rc = loo_Eddsa.ConnectToNewObject("Chilkat.EdDSA")

ls_HexSig = loo_Eddsa.SignBdENC(loo_Bd,"hexlower",loo_PrivKey)

Write-Debug "signature = " + ls_HexSig

// The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

// Verify the signature..
loo_PubKey = create oleobject
// Use "Chilkat_9_5_0.PublicKey" for versions of Chilkat < 10.0.0
li_rc = loo_PubKey.ConnectToNewObject("Chilkat.PublicKey")

li_Success = loo_PubKey.LoadEd25519(ls_PubKeyHex)
if li_Success = 0 then
    Write-Debug loo_PubKey.LastErrorText
    destroy loo_PrivKey
    destroy loo_Bd
    destroy loo_Eddsa
    destroy loo_PubKey
    return
end if

li_BVerified = loo_Eddsa.VerifyBdENC(loo_Bd,ls_HexSig,"hexlower",loo_PubKey)
if li_BVerified = 0 then
    Write-Debug loo_Eddsa.LastErrorText
    Write-Debug "Failed to verify the signature."
    destroy loo_PrivKey
    destroy loo_Bd
    destroy loo_Eddsa
    destroy loo_PubKey
    return
end if

Write-Debug "The Ed25519 signature is verified!"


destroy loo_PrivKey
destroy loo_Bd
destroy loo_Eddsa
destroy loo_PubKey