AutoIt Requires Chilkat v11.0.0+

Encrypt with Chilkat, Decrypt with OpenSSL

See more OpenSSL Examples

Demonstrates how to RSA encrypt a string using Chilkat, and then shows the corresponding OpenSSL command to RSA decrypt. The OpenSSL command to decrypt is as follows:

openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

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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.

$oRsa = ObjCreate("Chilkat.Rsa")

;  Note: RSA encryption uses the public key.  
;  RSA decryption uses the private key.
;  The reason is that the public key can be freely provided to anybody.  This allows anybody
;  to send an encrypted message to the private key owner, and only the private key owner 
;  can decrypt.
$oKey = ObjCreate("Chilkat.PublicKey")

;  Load an RSA public key from a PEM file:
$bSuccess = $oKey.LoadFromFile("qa_data/pem/VP_Public.pem")
If ($bSuccess = False) Then
    ConsoleWrite($oKey.LastErrorText & @CRLF)
    Exit
EndIf

;  Load the public key into the RSA object.
$bSuccess = $oRsa.UsePublicKey($oKey)
If ($bSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

Local $strToEncrypt = "00000000;XYZ2-3BHQ-ABCD-MMVV;6MY1-GHJK-9LRR;0"

;  The LittleEndian property is False by default, but it is set here
;  anyway to show that LittleEndian byte ordering is required for OpenSSL compatibility.
$oRsa.LittleEndian = False

Local $bUsePrivateKey = False
Local $oEncryptedBytes
$oEncryptedBytes = $oRsa.EncryptString($strToEncrypt,$bUsePrivateKey)
If ($oRsa.LastMethodSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

;  The OpenSSL command to decrypt would be this:
;  openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

$oFac = ObjCreate("Chilkat.FileAccess")
$bSuccess = $oFac.WriteEntireFile("qa_output/rsa_encrypted.bin",$oEncryptedBytes)
If ($bSuccess = False) Then
    ConsoleWrite($oFac.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("RSA Encryption Succeeded." & @CRLF)