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(PHP ActiveX) Verify the RSA Signature of a SHA256 HashSee more RSA ExamplesDemonstrates how to verify an RSA signature of a SHA256 hash.
<?php // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Let's say you have a file containing the 32-bytes of a SHA256 hash, // and a file that is an RSA signature of those 32 bytes. // Here's how you verify using the RSA public key found in a PEM. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PublicKey') $pubKey = new COM("Chilkat.PublicKey"); $success = $pubKey->LoadFromFile('rsaPubKey.pem'); if ($success == 0) { print $pubKey->LastErrorText . "\n"; exit; } // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa') $rsa = new COM("Chilkat.Rsa"); // Get the public key. $success = $rsa->ImportPublicKeyObj($pubKey); if ($success == 0) { print $rsa->LastErrorText . "\n"; exit; } // Get the 32-byte SHA256 hash. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData') $bdHash = new COM("Chilkat.BinData"); $success = $bdHash->LoadFile('myHash.sha256'); if ($success == 0) { print 'Failed to load SHA256 hash.' . "\n"; exit; } // Get the RSA signature to be validated. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData') $bdSig = new COM("Chilkat.BinData"); $success = $bdSig->LoadFile('mySig.sig'); if ($success == 0) { print 'Failed to load RSA signature.' . "\n"; exit; } // Verify the signature against the SHA256 hash. $enc = 'base64'; $rsa->EncodingMode = $enc; $success = $rsa->VerifyHashENC($bdHash->getEncoded($enc),'sha256',$bdSig->getEncoded($enc)); if ($success == 0) { print $rsa->LastErrorText . "\n"; exit; } print 'Signature validated.' . "\n"; ?> |
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