Lua Requires Chilkat v9.5.0.91+

Ed25519ph Sign and Verify

See more Ed25519 Examples

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

local chilkat = require("chilkat")

-- 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

local privKeyHex = "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42"
local pubKeyHex = "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf"

local privKey = chilkat.PrivateKey.new()
local success = privKey:load_ed25519(privKeyHex, pubKeyHex)
if not success then
    print(privKey.last_error_text)
    return
end

-- The data to be signed...
local bd = chilkat.BinData.new()
bd:append_encoded("616263", "hex")

local eddsa = chilkat.EdDSA.new()
-- Indicate we want the Ed25519ph instance.
eddsa.algorithm = "Ed25519ph"

local hexSig = eddsa:sign_bd_enc(bd, "hexlower", privKey)

print("signature = " .. hexSig)

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

-- Verify the signature..
local pubKey = chilkat.PublicKey.new()
success = pubKey:load_ed25519(pubKeyHex)
if not success then
    print(pubKey.last_error_text)
    return
end

local bVerified = eddsa:verify_bd_enc(bd, hexSig, "hexlower", pubKey)
if not bVerified then
    print(eddsa.last_error_text)
    print("Failed to verify the signature.")
    return
end

print("The Ed25519ph signature is verified!")