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RSASSA-PSS Sign Binary Data

Signs binary data to create a PKCS7/CMS signature. The signature algorithm is RSASSA-PSS with SHA256.
Chilkat AutoIt Downloads

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Local $bSuccess = False

; This example requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

$oCrypt = ObjCreate("Chilkat.Crypt2")

; Get a digital certificate with private key from a .pfx
; (Chilkat has many different ways to provide a cert + private key for siging.
; Using a PFX is just one possible option.)
$oPfx = ObjCreate("Chilkat.Pfx")
$bSuccess = $oPfx.LoadPfxFile("qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD")
If ($bSuccess = False) Then
    ConsoleWrite($oPfx.LastErrorText & @CRLF)
    Exit
EndIf

; Get the certificate to be used for signing.
; (The typical case for a PFX is that it contains a cert with an associated private key,
; as well as other certificates in the chain of authentication.  The cert with the private
; key should be in the first position at index 0.)

$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oPfx.CertAt(0,$oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oPfx.LastErrorText & @CRLF)
    Exit
EndIf

$oCrypt.SetSigningCert($oCert)

; Indicate that RSASSA-PSS with SHA256 should be used.
$oCrypt.SigningAlg = "pss"
$oCrypt.HashAlgorithm = "sha256"

$oCrypt.EncodingMode = "base64_mime"

; Load a binary file to be signed:
$oBinaryData = ObjCreate("Chilkat.BinData")
$bSuccess = $oBinaryData.LoadFile("qa_data/jpg/starfish20.jpg")
If ($bSuccess <> True) Then
    ConsoleWrite("Failed to load file." & @CRLF)
    Exit
EndIf

; Sign the binary bytes to get a PKCS7 detached signature in base64 format:
Local $sPkcs7sig = $oCrypt.SignBdENC($oBinaryData)
ConsoleWrite("Detached PCKS7 Signature:" & @CRLF)
ConsoleWrite($sPkcs7sig & @CRLF)

; This signature looks like this:

; MIIG5wYJKoZIhvcNAQcCoIIG2DCCBtQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
; ggL4MIIC9DCCAl2gAwIBAgIJAMPsJCT11cniMA0GCSqGSIb3DQEBCwUAMIGSMQswCQYDVQQGEwJB
; VTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJu
; ZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWlu
; QGludGVybmV0d2lkZ2V0cy5jb20wHhcNMTYxMTAxMTY1MjMyWhcNMjExMDMxMTY1MjMyWjCBkjEL
; MAkGA1UEBhMCQVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNV
; BAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcN
; AQkBFhlhZG1pbkBpbnRlcm5ldHdpZGdldHMuY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKB
; gQDGIdoCjyavs+F/Rm0VIB4m6O7VL1j+1IqieoR9NEX2GQvu2VCdceyxf9qaw1bxipEvjLwUkw7M
; e+BTlLpWQbBMH87s6KpsC8MVyXhMLpP0oM8NFix/vLz2wdLhUh7CZvJA0plqkJk9bj57QIu+EO1k
; tUHM2DFb6sckvCL2yybD1wIDAQABo1AwTjAdBgNVHQ4EFgQUONKKu2zsXIrinWxIGT654vrcQwsw
; HwYDVR0jBBgwFoAUONKKu2zsXIrinWxIGT654vrcQwswDAYDVR0TBAUwAwEB/zANBgkqhkiG9w0B
; AQsFAAOBgQArFvdi5u9i2QF1Qw+cdC1l7w2Y3+q6RIkln2W8rWJFje00644o8hXy7v46giJCedmF
; ULlhm1n7XIsZGy2W3lJ77v5agn9gFwXu1h3cqkGXkoteE6SQJQXWgsW3GWPveObvTL8LF4y57fgM
; 9ZWS+V9MJajeu44Rf/tU17TLYKjvEjGCA7MwggOvAgEBMIGgMIGSMQswCQYDVQQGEwJBVTERMA8G
; A1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJuZXQgV2lk
; Z2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWluQGludGVy
; bmV0d2lkZ2V0cy5jb20CCQDD7CQk9dXJ4jANBglghkgBZQMEAgEFAKCCAjQwGAYJKoZIhvcNAQkD
; MQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMTcwNDI5MTYxMDI2WjAvBgkqhkiG9w0BCQQx
; IgQgrjUQkoMeBYUhmDGjPg147WybF0w2LAY6F+Ih6qHUMB8wXwYJKoZIhvcNAQkPMVIwUDALBglg
; hkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFAMAcGBSsO
; AwIHMA0GCCqGSIb3DQMCAgEoMIGxBgkrBgEEAYI3EAQxgaMwgaAwgZIxCzAJBgNVBAYTAkFVMREw
; DwYDVQQIDAhWaWN0b3JpYTESMBAGA1UEBwwJTWVsYm91cm5lMSEwHwYDVQQKDBhJbnRlcm5ldCBX
; aWRnaXRzIFB0eSBMdGQxDzANBgNVBAMMBldpZGdldDEoMCYGCSqGSIb3DQEJARYZYWRtaW5AaW50
; ZXJuZXR3aWRnZXRzLmNvbQIJAMPsJCT11cniMIGzBgsqhkiG9w0BCRACCzGBo6CBoDCBkjELMAkG
; A1UEBhMCQVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNVBAoM
; GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcNAQkB
; FhlhZG1pbkBpbnRlcm5ldHdpZGdldHMuY29tAgkAw+wkJPXVyeIwPQYJKoZIhvcNAQEKMDCgDTAL
; BglghkgBZQMEAgGhGjAYBgkqhkiG9w0BAQgwCwYJYIZIAWUDBAIBogMCASAEgYCWV0g82volvnwf
; YpwIpqpQzMmTPBKNQmFGjbyH2opdcbJwgu2qEFvaXkyjYDtgQ7XsCqc15dm6Ee1Ujkosbp57kLTt
; /WbwxY1CC/uxs3oV+5ESUyB+2iocTYABYn4ye0FhBPut86n/gzZTL+RLG6Z1fxwwzkoxWUp7GjKK
; 58mveQ==

; The ASN.1 of the signature can be examined by browsing to https://lapo.it/asn1js/ ,
; then copy-and-paste the Base64 signature into the form and decode..

; The signature can be verified against the original data like this:
$bSuccess = $oCrypt.VerifyBdENC($oBinaryData,$sPkcs7sig)
ConsoleWrite("Signature verified: " & $bSuccess & @CRLF)

; Now we'll create an opaque signature (the opposite of a detached signature). 
; An opaque signature is a PKCS7/CMS message that contains both the original data and
; the signature.  The verification process extracts the original data.

; Then OpaqueSignBd method in-place signs the binaryData.
; The contents of binaryData are replaced with the CMS/PKCS7 message.
$bSuccess = $oCrypt.OpaqueSignBd($oBinaryData)

; Show the contents of the opaque signature in base64 format:
ConsoleWrite("Opaque Signature:" & @CRLF)
ConsoleWrite($oBinaryData.GetEncoded("base64_mime") & @CRLF)

; MIIKCgYJKoZIhvcNAQcCoIIJ+zCCCfcCAQExDzANBglghkgBZQMEAgEFADCCAywGCSqGSIb3DQEH
; AaCCAx0EggMZ/9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBo
; b3Rvc2hvcD8gNC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBE
; V0U3OFBtUVdfYmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2Nj
; Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/E
; ABcAAAMBAAAAAAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQAC
; EAMQAAAB2kZYNNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgB
; AQABBQL0XqN+pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgB
; AwEBPwHqU5aqAxx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIB
; AT8B3Bhqy7ZcenyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEB
; AAY/ArZyn+CgxtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEA
; AT8hkEwPUUR9DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAA
; AAAAAAAAAAAAAAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAA
; AAAAAAAAAREAQRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAA
; AAABEQAhMUFxEFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO
; /n//2aCCAvgwggL0MIICXaADAgECAgkAw+wkJPXVyeIwDQYJKoZIhvcNAQELBQAwgZIxCzAJBgNV
; BAYTAkFVMREwDwYDVQQIDAhWaWN0b3JpYTESMBAGA1UEBwwJTWVsYm91cm5lMSEwHwYDVQQKDBhJ
; bnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxDzANBgNVBAMMBldpZGdldDEoMCYGCSqGSIb3DQEJARYZ
; YWRtaW5AaW50ZXJuZXR3aWRnZXRzLmNvbTAeFw0xNjExMDExNjUyMzJaFw0yMTEwMzExNjUyMzJa
; MIGSMQswCQYDVQQGEwJBVTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEh
; MB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkq
; hkiG9w0BCQEWGWFkbWluQGludGVybmV0d2lkZ2V0cy5jb20wgZ8wDQYJKoZIhvcNAQEBBQADgY0A
; MIGJAoGBAMYh2gKPJq+z4X9GbRUgHibo7tUvWP7UiqJ6hH00RfYZC+7ZUJ1x7LF/2prDVvGKkS+M
; vBSTDsx74FOUulZBsEwfzuzoqmwLwxXJeEwuk/Sgzw0WLH+8vPbB0uFSHsJm8kDSmWqQmT1uPntA
; i74Q7WS1QczYMVvqxyS8IvbLJsPXAgMBAAGjUDBOMB0GA1UdDgQWBBQ40oq7bOxciuKdbEgZPrni
; +txDCzAfBgNVHSMEGDAWgBQ40oq7bOxciuKdbEgZPrni+txDCzAMBgNVHRMEBTADAQH/MA0GCSqG
; SIb3DQEBCwUAA4GBACsW92Lm72LZAXVDD5x0LWXvDZjf6rpEiSWfZbytYkWN7TTrjijyFfLu/jqC
; IkJ52YVQuWGbWftcixkbLZbeUnvu/lqCf2AXBe7WHdyqQZeSi14TpJAlBdaCxbcZY+945u9MvwsX
; jLnt+Az1lZL5X0wlqN67jhF/+1TXtMtgqO8SMYIDszCCA68CAQEwgaAwgZIxCzAJBgNVBAYTAkFV
; MREwDwYDVQQIDAhWaWN0b3JpYTESMBAGA1UEBwwJTWVsYm91cm5lMSEwHwYDVQQKDBhJbnRlcm5l
; dCBXaWRnaXRzIFB0eSBMdGQxDzANBgNVBAMMBldpZGdldDEoMCYGCSqGSIb3DQEJARYZYWRtaW5A
; aW50ZXJuZXR3aWRnZXRzLmNvbQIJAMPsJCT11cniMA0GCWCGSAFlAwQCAQUAoIICNDAYBgkqhkiG
; 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNzA0MjkxNjEwMjZaMC8GCSqGSIb3
; DQEJBDEiBCCuNRCSgx4FhSGYMaM+DXjtbJsXTDYsBjoX4iHqodQwHzBfBgkqhkiG9w0BCQ8xUjBQ
; MAsGCWCGSAFlAwQBAjAKBggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwICAUAw
; BwYFKw4DAgcwDQYIKoZIhvcNAwICASgwgbEGCSsGAQQBgjcQBDGBozCBoDCBkjELMAkGA1UEBhMC
; QVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNVBAoMGEludGVy
; bmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcNAQkBFhlhZG1p
; bkBpbnRlcm5ldHdpZGdldHMuY29tAgkAw+wkJPXVyeIwgbMGCyqGSIb3DQEJEAILMYGjoIGgMIGS
; MQswCQYDVQQGEwJBVTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8G
; A1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG
; 9w0BCQEWGWFkbWluQGludGVybmV0d2lkZ2V0cy5jb20CCQDD7CQk9dXJ4jA9BgkqhkiG9w0BAQow
; MKANMAsGCWCGSAFlAwQCAaEaMBgGCSqGSIb3DQEBCDALBglghkgBZQMEAgGiAwIBIASBgAGVtpI5
; slxfw+1EyJK4jqxokLvUrqksBLotv1vaP4QaSeF2A1lNrsPfJoEjZJpD1F6vXrFPsR4sPD+6n7P/
; lz3sGoFykTjE2rPwKEFIbzfxD3gSZKJPWFgDa19DojarmwJMkSPXt9TQEzdjDPrbsCGLYOy29Puq
; ZDI1rUcyxg7Y

; The ASN.1 of the signature can be examined by browsing to https://lapo.it/asn1js/ ,
; then copy-and-paste the Base64 signature into the form and decode..

; The signature is verified, and the original data restored like this:
$bSuccess = $oCrypt.OpaqueVerifyBd($oBinaryData)
If ($bSuccess <> True) Then
    ConsoleWrite("Signature verification failed." & @CRLF)
    ConsoleWrite($oCrypt.LastErrorText & @CRLF)
    Exit
EndIf

; Save the extracted data to a file:
$bSuccess = $oBinaryData.WriteFile("qa_output/extractedStarfish20.jpg")

ConsoleWrite("Signature verified." & @CRLF)