(Xojo Plugin) Sign Mexico Pedimento

Add a signature to a Mexico pedimento file.

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim success As Boolean

// This is the contents before signing:

// 500|1|3621|4199800|400||
// 601|3621|4199800|400|IN|1||EKU9003173C9|EKU9003173C9FRNN09|1||
// 507|4199800|IM|2006-7888">
// 507|4199800|MS|2">
// 800|4199800|1">
// 801|M3621037.222|1|5|011|

// This is the contents after signing

// 500|1|3621|4199800|400||
// 601|3621|4199800|400|IN|1||EKU9003173C9|EKU9003173C9FRNN09|1||
// 507|4199800|IM|2006-7888">
// 507|4199800|MS|2">
// 800|4199800|1|fhP2Ker54D2+3+UZch23F0E72 .... 9qNSPIuAqpj524qLZbbA==|30001000000500003416|
// 801|M3621037.222|1|5|011|

// First create the text to be signed.
Dim bCRLF As Boolean
bCRLF = True
Dim sb As New Chilkat.StringBuilder
// Use CRLF line endings.
success = sb.AppendLine("500|1|3621|4199800|400||",bCRLF)
success = sb.AppendLine("601|3621|4199800|400|IN|1||EKU9003173C9|EKU9003173C9FRNN09|1||",bCRLF)
success = sb.AppendLine("507|4199800|IM|2006-7888">",bCRLF)
success = sb.AppendLine("507|4199800|MS|2">",bCRLF)

// Generate the MD5 hash of what we have so far..
Dim md5_base64 As String
md5_base64 = sb.GetHash("md5","base64","utf-8")
System.DebugLog("MD5 hash = " + md5_base64)

// Complete the original file.
// After signing, we'll update the BASE64_SIGNATURE and CERT_SERIAL
success = sb.AppendLine("800|4199800|1|BASE64_SIGNATURE|CERT_SERIAL|",bCRLF)
success = sb.AppendLine("801|M3621037.222|1|5|011|",bCRLF)

// We're going to sign the MD5 hash using the private key.
Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadAnyFormatFile("qa_data/certs/mexico_test/Certificados_de_Prueba/Certificados_Pruebas/Personas Morales/EKU9003173C9_20230517223532/CSD_EKU9003173C9_20230517223903/CSD_Sucursal_1_EKU9003173C9_20230517_223850.key","12345678a")
If (success = False) Then
    System.DebugLog(privKey.LastErrorText)
    Return
End If

// Generate the ASN.1 to be signed.

// <sequence>
//     <sequence>
//         <oid>1.2.840.113549.2.5</oid>
//         <null/>
//     </sequence>
//     <octets>SwxHfaJhG+N3pPqay6UzVA==</octets>
// </sequence>

Dim xml As New Chilkat.Xml
xml.Tag = "sequence"
xml.UpdateChildContent "sequence|oid","1.2.840.113549.2.5"
xml.UpdateChildContent "sequence|null",""
xml.UpdateChildContent "octets",md5_base64

Dim asn As New Chilkat.Asn
success = asn.LoadAsnXml(xml.GetXml())
System.DebugLog("ASN.1 = " + asn.GetEncodedDer("base64"))

// Sign with the private key.
Dim rsa As New Chilkat.Rsa
success = rsa.ImportPrivateKeyObj(privKey)
If (success = False) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

// Create the opaque signature.
Dim bdSig As New Chilkat.BinData
success = bdSig.AppendEncoded(asn.GetEncodedDer("base64"),"base64")
success = rsa.OpenSslSignBd(bdSig)
If (success = False) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

// bd now contains the opaque signature, which embeds the ASN.1, which contains the MD5 hash.
// We're going to add this line:
// 800|4199800|1|BASE64_SIGNATURE|CERT_SERIAL_NUM|

Dim cert As New Chilkat.Cert
success = cert.LoadFromFile("qa_data/certs/mexico_test/Certificados_de_Prueba/Certificados_Pruebas/Personas Morales/EKU9003173C9_20230517223532/CSD_EKU9003173C9_20230517223903/CSD_Sucursal_1_EKU9003173C9_20230517_223850.cer")
If (success = False) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

Dim serialHex As String
serialHex = cert.SerialNumber
// The serial in hex form looks like this:   3330303031303030303030353030303033343136
// Decode to us-ascii.
Dim sbSerial As New Chilkat.StringBuilder
success = sbSerial.DecodeAndAppend(serialHex,"hex","us-ascii")
System.DebugLog("serial number in us-ascii: " + sbSerial.GetAsString())

Dim numReplaced As Int32
numReplaced = sb.Replace("CERT_SERIAL",sbSerial.GetAsString())
numReplaced = sb.Replace("BASE64_SIGNATURE",bdSig.GetEncoded("base64"))

System.DebugLog("------------------------------------")
System.DebugLog("Result:")
System.DebugLog(sb.GetAsString())