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(Perl) RSA Hash Binary Data and Sign (and Verify)Demonstrates how to sign the hash of binary data. Also demonstrates how to verify the RSA signature. Note: This example uses methods introduced in Chilkat v9.5.0.77.
use chilkat(); # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. # Load an RSA private key for signing. $privKey = chilkat::CkPrivateKey->new(); $success = $privKey->LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd"); if ($success != 1) { print $privKey->lastErrorText() . "\r\n"; exit; } $rsa = chilkat::CkRsa->new(); $rsa->ImportPrivateKeyObj($privKey); # We have some binary data (in hex) to sign $originalData = "0102030405060708090A"; $bdData = chilkat::CkBinData->new(); $bdData->AppendEncoded($originalData,"hex"); # Hash (SHA-256) and sign the hash: $bdSignature = chilkat::CkBinData->new(); $success = $rsa->SignBd($bdData,"sha256",$bdSignature); if ($success != 1) { print $rsa->lastErrorText() . "\r\n"; exit; } # Show the RSA signature in base64 print $bdSignature->getEncoded("base64") . "\r\n"; # ------------------------------------------ # Get the public key from the private key # pubKey is a PublicKey $pubKey = $privKey->GetPublicKey(); # Verify the signature.. $rsa2 = chilkat::CkRsa->new(); $rsa2->ImportPublicKeyObj($pubKey); $bVerified = $rsa2->VerifyBd($bdData,"sha256",$bdSignature); print "signature verified: " . $bVerified . "\r\n"; |
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