Lianja

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.

Lianja

llSuccess = .F.

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

lcPrivKeyHex = "1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93"
lcPubKeyHex = "b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde"

loPrivKey = createobject("CkPrivateKey")
// 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.
llSuccess = loPrivKey.LoadEd25519(lcPrivKeyHex,lcPubKeyHex)
if (llSuccess = .F.) then
    ? loPrivKey.LastErrorText
    release loPrivKey
    return
endif

// The data to be signed...
loBd = createobject("CkBinData")
loBd.AppendString("Message for Ed25519 signing","utf-8")

loEddsa = createobject("CkEdDSA")
lcHexSig = loEddsa.SignBdENC(loBd,"hexlower",loPrivKey)

? "signature = " + lcHexSig

// The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

// Verify the signature..
loPubKey = createobject("CkPublicKey")
llSuccess = loPubKey.LoadEd25519(lcPubKeyHex)
if (llSuccess = .F.) then
    ? loPubKey.LastErrorText
    release loPrivKey
    release loBd
    release loEddsa
    release loPubKey
    return
endif

llBVerified = loEddsa.VerifyBdENC(loBd,lcHexSig,"hexlower",loPubKey)
if (llBVerified = .F.) then
    ? loEddsa.LastErrorText
    ? "Failed to verify the signature."
    release loPrivKey
    release loBd
    release loEddsa
    release loPubKey
    return
endif

? "The Ed25519 signature is verified!"


release loPrivKey
release loBd
release loEddsa
release loPubKey