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RSAES-OAEP Encrypt String with AES-128 Content Encryption and SHA256

See more Encryption Examples

Encrypts a string using RSAES-OAEP with SHA256 and AES-128 content encryption to produce PKCS7 output (base64 encoded).

Note: This example requires Chilkat v9.5.0.67 or greater.

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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.

;  First build a string to be encrypted
$oSb = ObjCreate("Chilkat.StringBuilder")
Local $i = 1
While $i < 25
    $oSb.AppendInt($i)
    $oSb.Append(" the quick brown fox jumped over the lazy dog." & @CRLF)
    $i = $i + 1
Wend

ConsoleWrite($oSb.GetAsString() & @CRLF)

;  The string to be encrypted looks like this:

;  1 the quick brown fox jumped over the lazy dog.
;  2 the quick brown fox jumped over the lazy dog.
;  3 the quick brown fox jumped over the lazy dog.
;  4 the quick brown fox jumped over the lazy dog.
;  5 the quick brown fox jumped over the lazy dog.
;  6 the quick brown fox jumped over the lazy dog.
;  ...

;  Load a digital certificate. 
;  We don't need the private key for encryption.
;  Only the public key is needed (which is included in a certificate).
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadFromFile("qa_data/rsaes-oaep/cert.pem")
If ($bSuccess <> True) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

$oCrypt = ObjCreate("Chilkat.Crypt2")

;  Tell the crypt object to use the certificate.
$oCrypt.SetEncryptCert($oCert)

;  Indicate that we want PKI encryption (i.e. public-key infrastructure)
;  to produce a CMS message (Cryptographic Message Syntax/PKCS7),
;  that is be created with RSAES-OAEP padding, SHA256, and AES-128 for the
;  bulk encryption.
$oCrypt.CryptAlgorithm = "pki"
$oCrypt.Pkcs7CryptAlg = "aes"
$oCrypt.KeyLength = 128
$oCrypt.OaepHash = "sha256"
$oCrypt.OaepPadding = True

;  Also, don't forget to be specific about the character encoding (byte representation) of the
;  string to be encrypted.
$oCrypt.Charset = "utf-8"

;  Now indicate that the PKCS7 output is to be returned in the base64 encoding.
$oCrypt.EncodingMode = "base64"

Local $sBase64Pkcs7 = $oCrypt.EncryptStringENC($oSb.GetAsString())
If ($oCrypt.LastMethodSuccess <> True) Then
    ConsoleWrite($oCrypt.LastErrorText & @CRLF)
    Exit
EndIf

;  Show the output
ConsoleWrite($sBase64Pkcs7 & @CRLF)

;  This base64 can be copy-and-pasted into the form at http://lapo.it/asn1js/
;  to verify that all the chosen algorithms were indeed used.

ConsoleWrite("OK." & @CRLF)