Go

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.

Go

    success := false

    // 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

    privKeyHex := "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42"
    pubKeyHex := "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf"

    privKey := chilkat.NewPrivateKey()
    success = privKey.LoadEd25519(privKeyHex,pubKeyHex)
    if success == false {
        fmt.Println(privKey.LastErrorText())
        privKey.DisposePrivateKey()
        return
    }

    // The data to be signed...
    bd := chilkat.NewBinData()
    bd.AppendEncoded("616263","hex")

    eddsa := chilkat.NewEdDSA()
    // Indicate we want the Ed25519ph instance.
    eddsa.SetAlgorithm("Ed25519ph")

    hexSig := eddsa.SignBdENC(bd,"hexlower",privKey)

    fmt.Println("signature = ", *hexSig)

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

    // Verify the signature..
    pubKey := chilkat.NewPublicKey()
    success = pubKey.LoadEd25519(pubKeyHex)
    if success == false {
        fmt.Println(pubKey.LastErrorText())
        privKey.DisposePrivateKey()
        bd.DisposeBinData()
        eddsa.DisposeEdDSA()
        pubKey.DisposePublicKey()
        return
    }

    bVerified := eddsa.VerifyBdENC(bd,*hexSig,"hexlower",pubKey)
    if bVerified == false {
        fmt.Println(eddsa.LastErrorText())
        fmt.Println("Failed to verify the signature.")
        privKey.DisposePrivateKey()
        bd.DisposeBinData()
        eddsa.DisposeEdDSA()
        pubKey.DisposePublicKey()
        return
    }

    fmt.Println("The Ed25519ph signature is verified!")

    privKey.DisposePrivateKey()
    bd.DisposeBinData()
    eddsa.DisposeEdDSA()
    pubKey.DisposePublicKey()