(Perl) 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.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use 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

$privKeyHex = "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42";
$pubKeyHex = "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf";

$privKey = chilkat::CkPrivateKey->new();
$success = $privKey->LoadEd25519($privKeyHex,$pubKeyHex);
if ($success == 0) {
    print $privKey->lastErrorText() . "\r\n";
    exit;
}

# The data to be signed...
$bd = chilkat::CkBinData->new();
$bd->AppendEncoded("616263","hex");

$eddsa = chilkat::CkEdDSA->new();
# Indicate we want the Ed25519ph instance.
$eddsa->put_Algorithm("Ed25519ph");

$hexSig = $eddsa->signBdENC($bd,"hexlower",$privKey);

print "signature = " . $hexSig . "\r\n";

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

# Verify the signature..
$pubKey = chilkat::CkPublicKey->new();
$success = $pubKey->LoadEd25519($pubKeyHex);
if ($success == 0) {
    print $pubKey->lastErrorText() . "\r\n";
    exit;
}

$bVerified = $eddsa->VerifyBdENC($bd,$hexSig,"hexlower",$pubKey);
if ($bVerified == 0) {
    print $eddsa->lastErrorText() . "\r\n";
    print "Failed to verify the signature." . "\r\n";
    exit;
}

print "The Ed25519ph signature is verified!" . "\r\n";