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

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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_Sb
integer i
oleobject loo_Cert
integer li_Success
oleobject loo_Crypt
string ls_Base64Pkcs7

// 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
loo_Sb = create oleobject
li_rc = loo_Sb.ConnectToNewObject("Chilkat.StringBuilder")
if li_rc < 0 then
    destroy loo_Sb
    MessageBox("Error","Connecting to COM object failed")
    return
end if
i = 1
do while i < 25
    loo_Sb.AppendInt(i)
    loo_Sb.Append(" the quick brown fox jumped over the lazy dog.~r~n")
    i = i + 1
loop

Write-Debug loo_Sb.GetAsString()

// 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).
loo_Cert = create oleobject
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")

li_Success = loo_Cert.LoadFromFile("qa_data/rsaes-oaep/cert.pem")
if li_Success <> 1 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_Sb
    destroy loo_Cert
    return
end if

loo_Crypt = create oleobject
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")

// Tell the crypt object to use the certificate.
loo_Crypt.SetEncryptCert(loo_Cert)

// 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.
loo_Crypt.CryptAlgorithm = "pki"
loo_Crypt.Pkcs7CryptAlg = "aes"
loo_Crypt.KeyLength = 128
loo_Crypt.OaepHash = "sha256"
loo_Crypt.OaepPadding = 1

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

// Now indicate that the PKCS7 output is to be returned in the base64 encoding.
loo_Crypt.EncodingMode = "base64"

ls_Base64Pkcs7 = loo_Crypt.EncryptStringENC(loo_Sb.GetAsString())
if loo_Crypt.LastMethodSuccess <> 1 then
    Write-Debug loo_Crypt.LastErrorText
    destroy loo_Sb
    destroy loo_Cert
    destroy loo_Crypt
    return
end if

// Show the output
Write-Debug ls_Base64Pkcs7

// 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.

Write-Debug "OK."


destroy loo_Sb
destroy loo_Cert
destroy loo_Crypt