(Ruby) Verfies an RSA Signature

See more Apple Keychain Examples

Verifies an RSA signature against the original data.

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

require 'chilkat'

# The following data was signed by the following example:
# RSA Sign using a Private Key on a USB Token or Smartcard
bd = Chilkat::CkBinData.new()

for i in 0 .. 100
    bd.AppendEncoded("000102030405060708090A0B0C0D0E0F","hex")
end

# Load the signature
bdSig = Chilkat::CkBinData.new()
success = bdSig.LoadFile("rsaSignatures/test1.sig")
if (success == false)
    print "Failed to load the RSA signature" + "\n";
    exit
end

# Get the public key to be used for signature verification.
pubKey = Chilkat::CkPublicKey.new()
success = pubKey.LoadFromFile("rsaKeys/chilkat-rsa-2048.pem")
if (success == false)
    print pubKey.lastErrorText() + "\n";
    exit
end

rsa = Chilkat::CkRsa.new()
rsa.ImportPublicKeyObj(pubKey)

# Verify the hash of the data against the signature.
# We pass in the original data.  Internally, the hash is generated
# and used to validate the signature.
# Validating the RSA signature means two things:  
# (1) the original data is exactly what was signed, and 
# (2) it was signed by the owner of the RSA private key.
success = rsa.VerifyBd(bd,"sha256",bdSig)

if (success == false)
    print rsa.lastErrorText() + "\n";
    print "Signature invalid." + "\n";
else
    print "Signature valid." + "\n";
end