(Visual FoxPro) Ed25519ph Sign and Verify

See more Ed25519 Examples

Demonstrates how to create an Ed25519ph signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.91 or greater.

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

LOCAL lcPrivKeyHex
LOCAL lcPubKeyHex
LOCAL loPrivKey
LOCAL lnSuccess
LOCAL loBd
LOCAL loEddsa
LOCAL lcHexSig
LOCAL loPubKey
LOCAL lnBVerified

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

* Use the following test vector from https://www.rfc-editor.org/rfc/rfc8032#page-30

*    -----TEST abc
* 
*    ALGORITHM:
*    Ed25519ph
* 
*    SECRET KEY:
*    833fe62409237b9d62ec77587520911e
*    9a759cec1d19755b7da901b96dca3d42
* 
*    PUBLIC KEY:
*    ec172b93ad5e563bf4932c70e1245034
*    c35467ef2efd4d64ebf819683467e2bf
* 
*    MESSAGE (length 3 bytes):
*    616263
* 
*    SIGNATURE:
*    98a70222f0b8121aa9d30f813d683f80
*    9e462b469c7ff87639499bb94e6dae41
*    31f85042463c2a355a2003d062adf5aa
*    a10b8c61e636062aaad11c2a26083406

lcPrivKeyHex = "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42"
lcPubKeyHex = "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf"

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PrivateKey')
loPrivKey = CreateObject('Chilkat.PrivateKey')
lnSuccess = loPrivKey.LoadEd25519(lcPrivKeyHex,lcPubKeyHex)
IF (lnSuccess = 0) THEN
    ? loPrivKey.LastErrorText
    RELEASE loPrivKey
    CANCEL
ENDIF

* The data to be signed...
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loBd = CreateObject('Chilkat.BinData')
loBd.AppendEncoded("616263","hex")

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.EdDSA')
loEddsa = CreateObject('Chilkat.EdDSA')
* Indicate we want the Ed25519ph instance.
loEddsa.Algorithm = "Ed25519ph"

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

? "signature = " + lcHexSig

* The expected output is: 98a70222f0b8121aa9d30f813d683f80....

* Verify the signature..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PublicKey')
loPubKey = CreateObject('Chilkat.PublicKey')
lnSuccess = loPubKey.LoadEd25519(lcPubKeyHex)
IF (lnSuccess = 0) THEN
    ? loPubKey.LastErrorText
    RELEASE loPrivKey
    RELEASE loBd
    RELEASE loEddsa
    RELEASE loPubKey
    CANCEL
ENDIF

lnBVerified = loEddsa.VerifyBdENC(loBd,lcHexSig,"hexlower",loPubKey)
IF (lnBVerified = 0) THEN
    ? loEddsa.LastErrorText
    ? "Failed to verify the signature."
    RELEASE loPrivKey
    RELEASE loBd
    RELEASE loEddsa
    RELEASE loPubKey
    CANCEL
ENDIF

? "The Ed25519ph signature is verified!"

RELEASE loPrivKey
RELEASE loBd
RELEASE loEddsa
RELEASE loPubKey