Xbase++

Ed25519 Sign and Verify

See more Ed25519 Examples

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

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

Xbase++

LOCAL nSuccess
LOCAL cPrivKeyHex
LOCAL cPubKeyHex
LOCAL oPrivKey
LOCAL oBd
LOCAL oEddsa
LOCAL cHexSig
LOCAL oPubKey
LOCAL nBVerified

nSuccess := 0

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

cPrivKeyHex := "1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93"
cPubKeyHex := "b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde"

oPrivKey := CreateObject("Chilkat.PrivateKey")
//  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.
nSuccess := oPrivKey:LoadEd25519(cPrivKeyHex, cPubKeyHex)
IF (nSuccess == 0)
    ? oPrivKey:LastErrorText
    oPrivKey:destroy()
    RETURN
ENDIF

//  The data to be signed...
oBd := CreateObject("Chilkat.BinData")
oBd:AppendString("Message for Ed25519 signing", "utf-8")

oEddsa := CreateObject("Chilkat.EdDSA")
cHexSig := oEddsa:SignBdENC(oBd, "hexlower", oPrivKey)

? "signature = " + cHexSig

//  The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

//  Verify the signature..
oPubKey := CreateObject("Chilkat.PublicKey")
nSuccess := oPubKey:LoadEd25519(cPubKeyHex)
IF (nSuccess == 0)
    ? oPubKey:LastErrorText
    oPrivKey:destroy()
    oBd:destroy()
    oEddsa:destroy()
    oPubKey:destroy()
    RETURN
ENDIF

nBVerified := oEddsa:VerifyBdENC(oBd, cHexSig, "hexlower", oPubKey)
IF (nBVerified == 0)
    ? oEddsa:LastErrorText
    ? "Failed to verify the signature."
    oPrivKey:destroy()
    oBd:destroy()
    oEddsa:destroy()
    oPubKey:destroy()
    RETURN
ENDIF

? "The Ed25519 signature is verified!"

oPrivKey:destroy()
oBd:destroy()
oEddsa:destroy()
oPubKey:destroy()