Verify Java Signature

Demonstrates how to verify a digital signature produced by Java.
The Java code that produces a digital signature that can be verified with
this Chilkat example is found at: http://www.cknotes.com/?p=283

Downloads for Windows/Linux and Install Instructions

require 'rubygems'
require 'chilkat'


pubKey = Chilkat::CkPublicKey.new()

#  Load an RSA public key from an ASN.1 DER file
success = pubKey.LoadRsaDerFile("pubKey.der")

if (success != true)
    print pubKey.lastErrorText() + "\n";
    exit
end

#  Get the public key in XML format:
pkeyXml = pubKey.getXml()

rsa = Chilkat::CkRsa.new()

#  Any string argument automatically begins the 30-day trial.
success = rsa.UnlockComponent("30-day trial")
if (success != true)
    print rsa.lastErrorText() + "\n";
    exit
end

#  Import the public key into the RSA component:
success = rsa.ImportPublicKey(pkeyXml)
if (success != true)
    print rsa.lastErrorText() + "\n";
    exit
end

rsa.put_EncodingMode("base64")

strData = "The quick brown fox jumps over the lazy dog"

#  IMPORTANT:  This Base64 signature will have to be updated
#  with the digital signature produced by the Java code at:
#  http://www.cknotes.com/?p=283
base64Sig = "VGV5A+bodHBpBwwJZdf17Bv+lkBTm/gteOf8iCgEEfNzBosZLaAB8X55BIZIkE2zKRXoMcJT+iCxsj+1hnlwJeKZ+Gya58lrHw6NWm2N0O/KyfnuEzADOM86X0xrkgdFT6SYpbZ9dWPC59NiHeEdVyjOXNJ3fBpUSQ5/5pvVWm0="

#  Verify the signature produced by the Java code at:
#  http://www.cknotes.com/?p=283
#  The VerifyStringENC method hashes the input data and verifies
#  the hash against the signature.
success = rsa.VerifyStringENC(strData,"sha-1",base64Sig)
#  Is the signature verified?
if (success == true)
    print "Signature Verified!" + "\n";
else
    print "Signature not verified!" + "\n";
end