(Ruby) Verify an RSA Signature Against the Signed Hash

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Demonstrates how to validate an RSA Signature against the hash that was signed.

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

require 'chilkat'

bd = Chilkat::CkBinData.new()

for i in 0 .. 100
    bd.AppendEncoded("000102030405060708090A0B0C0D0E0F","hex")
end
sha256_base64 = bd.getHash("sha256","base64")
print "sha256 hash in base64 format: " + sha256_base64 + "\n";

base64_rsa_sig = "AwF2BbOvL6jA5DwmMAc9n6J2Cc8PI6Rj5W079+aKJcIEtPWRzHor0Bvc3aftGM3Jbgj6SXlIC3M3RYS7UZOnfiHKFNZgbxaNT5WwsWooK42ZkC8DBZl0p7OunBUKd5SciUo+TKilioeUkriN3L1Zl9hwi3HVDVqgVo3XXskwIftSqLSFlepTLTmOWj9Y93dp8J4D9RyLtNgFQBc0WB22tyJTsuY56mLcWe1AMF3LizB9OrbwjynF2u16xWlrJdugccz795fJBUV9aQSD+8S3KeqwQhoi8RK1uhD68aGCyaSpBq0NZ8COAkn7MXaF4POxrAAt8udfHM+PRfSOptcH/w=="

# 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 against the signature.
rsa.put_EncodingMode("base64")
success = rsa.VerifyHashENC(sha256_base64,"sha256",base64_rsa_sig)

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