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(Classic ASP) Sign a Byte Array to Create a Detached Signature in a Byte ArraySigns data contained in a byte array to produce a detached signature (also in a byte array). Also shows how to verify the signature.
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <% ' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Cert") set cert = Server.CreateObject("Chilkat.Cert") success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123") If (success = 0) Then Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>" Response.End End If ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.FileAccess") set fac = Server.CreateObject("Chilkat.FileAccess") fileBytes = fac.ReadEntireFile("qa_data/pdf/sample.pdf") If (fac.LastMethodSuccess <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( fac.LastErrorText) & "</pre>" Response.End End If ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Crypt2") set crypt = Server.CreateObject("Chilkat.Crypt2") success = crypt.SetSigningCert(cert) ' We can sign any type of file. ' The result is a detached signature (a signature that does not contain the data being signed). sigBytes = crypt.SignBytes(fileBytes) If (crypt.LastMethodSuccess <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>" Response.End End If success = fac.WriteEntireFile("qa_output/sample.pdf.p7s",sigBytes) If (fac.LastMethodSuccess <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( fac.LastErrorText) & "</pre>" Response.End End If ' We can verify the detached signature like this verified = crypt.VerifyBytes(fileBytes,sigBytes) If (crypt.LastMethodSuccess <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>" Response.End End If Response.Write "<pre>" & Server.HTMLEncode( "Verified = " & verified) & "</pre>" %> </body> </html> |
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