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(Classic ASP) RSA Sign Binary Data and Verify (Recover the Original Data)Demonstrates how to RSA sign binary data and then verify/recover the original data. Note: This example uses methods introduced in Chilkat v9.5.0.77. Note: This example requires Chilkat v11.0.0 or greater.
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <% success = 0 ' 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. set privKey = Server.CreateObject("Chilkat.PrivateKey") success = privKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd") If (success = 0) Then Response.Write "<pre>" & Server.HTMLEncode( privKey.LastErrorText) & "</pre>" Response.End End If set rsa = Server.CreateObject("Chilkat.Rsa") success = rsa.UsePrivateKey(privKey) ' We have some binary data (in hex) to sign originalData = "0102030405060708090A" set bd = Server.CreateObject("Chilkat.BinData") success = bd.AppendEncoded(originalData,"hex") ' If successful, the contents of bd are replaced with the RSA signature. success = rsa.SignRawBd(bd) If (success = 0) Then Response.Write "<pre>" & Server.HTMLEncode( rsa.LastErrorText) & "</pre>" Response.End End If ' Show the RSA signature in base64 Response.Write "<pre>" & Server.HTMLEncode( bd.GetEncoded("base64")) & "</pre>" ' ------------------------------------------ ' Get the public key from the private key set pubKey = Server.CreateObject("Chilkat.PublicKey") success = privKey.ToPublicKey(pubKey) ' Verify the signature and extract the original data. set rsa2 = Server.CreateObject("Chilkat.Rsa") success = rsa2.UsePublicKey(pubKey) bVerified = rsa2.VerifyRawBd(bd) Response.Write "<pre>" & Server.HTMLEncode( "signature verified: " & bVerified) & "</pre>" ' Show the original data: Response.Write "<pre>" & Server.HTMLEncode( "original data: " & bd.GetEncoded("hex")) & "</pre>" %> </body> </html> |
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