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(Mono C#) Verify the RSA Signature of a SHA256 HashSee more RSA ExamplesDemonstrates how to verify an RSA signature of a SHA256 hash.
// 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. Chilkat.PublicKey pubKey = new Chilkat.PublicKey(); bool success = pubKey.LoadFromFile("rsaPubKey.pem"); if (success == false) { Debug.WriteLine(pubKey.LastErrorText); return; } Chilkat.Rsa rsa = new Chilkat.Rsa(); // Get the public key. success = rsa.ImportPublicKeyObj(pubKey); if (success == false) { Debug.WriteLine(rsa.LastErrorText); return; } // Get the 32-byte SHA256 hash. Chilkat.BinData bdHash = new Chilkat.BinData(); success = bdHash.LoadFile("myHash.sha256"); if (success == false) { Debug.WriteLine("Failed to load SHA256 hash."); return; } // Get the RSA signature to be validated. Chilkat.BinData bdSig = new Chilkat.BinData(); success = bdSig.LoadFile("mySig.sig"); if (success == false) { Debug.WriteLine("Failed to load RSA signature."); return; } // Verify the signature against the SHA256 hash. string enc = "base64"; rsa.EncodingMode = enc; success = rsa.VerifyHashENC(bdHash.GetEncoded(enc),"sha256",bdSig.GetEncoded(enc)); if (success == false) { Debug.WriteLine(rsa.LastErrorText); return; } Debug.WriteLine("Signature validated."); |
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