(Ruby) 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 Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

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

privKeyHex = "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42"
pubKeyHex = "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf"

privKey = Chilkat::CkPrivateKey.new()
success = privKey.LoadEd25519(privKeyHex,pubKeyHex)
if (success == false)
    print privKey.lastErrorText() + "\n";
    exit
end

# 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 + "\n";

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

# Verify the signature..
pubKey = Chilkat::CkPublicKey.new()
success = pubKey.LoadEd25519(pubKeyHex)
if (success == false)
    print pubKey.lastErrorText() + "\n";
    exit
end

bVerified = eddsa.VerifyBdENC(bd,hexSig,"hexlower",pubKey)
if (bVerified == false)
    print eddsa.lastErrorText() + "\n";
    print "Failed to verify the signature." + "\n";
    exit
end

print "The Ed25519ph signature is verified!" + "\n";