(Lianja) Ed25519ph Sign and Verify

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

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

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// 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"

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

// The data to be signed...
loBd = createobject("CkBinData")
loBd.AppendEncoded("616263","hex")

loEddsa = createobject("CkEdDSA")
// 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..
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 Ed25519ph signature is verified!"


release loPrivKey
release loBd
release loEddsa
release loPubKey