(Excel) openssl smime -encrypt -des3 -in

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OpenSSL SMIME encrypt file using PEM containing a certificate.

Download Excel Class Modules Chilkat Excel Class Modules

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

' Load the cert from a PEM file.

Dim pem As Chilkat.Pem
Set pem = Chilkat.NewPem
' Our particular PEM was not encrypted, so we pass an empty password.
' Also, a private key is not needed for encryption.  The PEM used to test this example
' happens to have a private key, but it's not actually used.

success = pem.LoadPemFile("qa_data/openssl/rsaCertAndKey.pem","")
If (success = False) Then
    Debug.Print pem.LastErrorText
    Exit Sub
End If

If (pem.NumCerts = 0) Then
    Debug.Print "PEM does not contain any certificates."
    Exit Sub
End If


Set cert = pem.GetCert(0)
If (pem.LastMethodSuccess = False) Then
    Debug.Print pem.LastErrorText
    Exit Sub
End If

' -------------------------------------------------------------------------------------
' Duplicate this OpenSSL command:   openssl smime -encrypt -des3 -in <file> <pem file>
' -------------------------------------------------------------------------------------
Dim crypt As Chilkat.Crypt2
Set crypt = Chilkat.NewCrypt2
success = crypt.SetEncryptCert(cert)
If (success = False) Then
    Debug.Print crypt.LastErrorText

    Exit Sub
End If

crypt.CryptAlgorithm = "PKI"
crypt.Pkcs7CryptAlg = "3des"
crypt.KeyLength = 168

' Load the file to be encrypted.
Dim bd As Chilkat.BinData
Set bd = Chilkat.NewBinData
success = bd.LoadFile("qa_data/openssl/hello.txt")
If (success = False) Then
    Debug.Print "Failed to load the input file."
    Exit Sub
End If

' Encrypt.
success = crypt.EncryptBd(bd)
If (success = False) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

' The openssl smime -encrypt command produces encrypte MIME such as this:

' MIME-Version: 1.0
' Content-Disposition: attachment; filename="smime.p7m"
' Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data; name="smime.p7m"
' Content-Transfer-Encoding: base64
' 
' MIICzwYJKoZIhvcNAQcDoIICwDCCArwCAQAxggF8MIIBeAIBADBgMEoxCzAJBgNVBAYTAlVTMRYw
' FAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQDExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBY
' MwISA9Nqgb1dH/XTDNeKzN1nR85iMA0GCSqGSIb3DQEBAQUABIIBAIQqPexjxWovgxwKV/r3HL/U
' EP9Yozvz5hBeX5VvRZjKSi4FRw5wapElPK+4FB82hiAR9Mi3c16PvPSVkJv3l78Mv5uaaOs/OmUz
' mIHFB6Z+l2E52BDmUVWJZTQ09vdWy6+NIRlg2R9Z1NkmZ4BZCJk6mHB/Yx03IaOxK8LnwieDMthM
' SvxbhJnIOISN7k7ofs+/0vTXUpdQ+tlmwyVySMGQ6VMk+z4sqZJ2stacqCPtt/aiSwJ9p0OKmihf
' 3KDJceXJtavIQeA97yz1LqPvle35mmd5sBhV9qQYdTV/KJ+YM5uEZ9BHYbvMJbADFHwKzhcEY3qA
' 7T9acmEsb7NycOIwggE1BgkqhkiG9w0BBwEwFAYIKoZIhvcNAwcECERX/ZoHweSkgIIBEMmCMx49
' zjVAnGqRaBbvzQT1hg0uQSxIJjxMxC+HSuM+eY9oSOsbrw4uIijHKH9NdOpeDsdRzg2z5EBM7AlP
' Ht9DyPW5C2deV6RPX4F8gyExz+JUXrd+3Yb3AKTdpDkTWDmNCeO0r/YSqp518+mfU5hG8e336u51
' HAM44FeknA8oThWsD/wUB1e8vzsatK4UXW/KSu/166V7z+VT86kd+IHa7t60U9Yp0ZXgcM5Pb5Ni
' 69Qc5MKPzom2801H5UR/WjCgsxOIjOj49sKisjRy79skrJzxY5ZG05T0dKn6KC3TjRpIEEeOyhCd
' Nm2Y7dcW8GLMepdhWay5vePmQxmvmhbAtBprIem14NcrYeG6D5wP

' We have the body in bd
' Construct the header and base64 body...
Dim sbEncryptedMime As Chilkat.StringBuilder
Set sbEncryptedMime = Chilkat.NewStringBuilder

Dim success As Boolean
success = sbEncryptedMime.AppendLine("MIME-Version: 1.0",True)
success = sbEncryptedMime.AppendLine("Content-Disposition: attachment; filename=""smime.p7m""",True)
success = sbEncryptedMime.AppendLine("Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data; name=""smime.p7m""",True)
success = sbEncryptedMime.AppendLine("Content-Transfer-Encoding: base64",True)
success = sbEncryptedMime.AppendLine("",True)
success = sbEncryptedMime.AppendLine(bd.GetEncoded("base64_mime"),True)

' Show the result.
Debug.Print sbEncryptedMime.GetAsString()

' or save to a file..
success = sbEncryptedMime.WriteFile("qa_output/encryptedMime.txt","utf-8",False)