Xbase++
RSAES-OAEP Encrypt/Decrypt Binary Data with AES-128 and SHA56

Demonstrates the use of the new EncryptBd and DecryptBd methods introduced in Chilkat v9.5.0.67 to create a PKCS7/CMS (Cryptographic Message Syntax) message using RSAES-OAEP with AES-128 and SHA256.
Note: This example requires Chilkat v9.5.0.67 or greater.
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LOCAL nSuccess
LOCAL oJpgBytes
LOCAL oCrypt
LOCAL oCert

nSuccess := 0

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

//  Load a small JPG file to be encrypted/decrypted.
oJpgBytes := CreateObject("Chilkat.BinData")
nSuccess := oJpgBytes:LoadFile("qa_data/jpg/starfish20.jpg")
IF (nSuccess != 1)
    ? "Failed to load JPG file."
    oJpgBytes:destroy()
    RETURN
ENDIF

//  Show the unencrypted JPG bytes in Base64 format.
//  (The "base64_mime" encoding was added in Chilkat v9.5.0.67.
//  The "base64" encoding emits a single line of base64, whereas
//  "base64_mime" will emit multi-line base64 as it would appear
//  in MIME.)
? oJpgBytes:GetEncoded("base64_mime")

//  Sample base64_mime JPG data:

//  /9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g
//  NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf
//  YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj
//  Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA
//  AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY
//  NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+
//  pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq
//  Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc
//  enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg
//  xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9
//  DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA
//  AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA
//  QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx
//  EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q==

oCrypt := CreateObject("Chilkat.Crypt2")

//  Specify the encryption to be used.
//  "pki" indicates "Public Key Infrastructure" and will create a PKCS7/CMS message.
oCrypt:CryptAlgorithm := "pki"
oCrypt:Pkcs7CryptAlg := "aes"
oCrypt:KeyLength := 128
oCrypt:OaepHash := "sha256"
oCrypt:OaepPadding := 1

//  A certificate is needed as the encryption key..
oCert := CreateObject("Chilkat.Cert")
nSuccess := oCert:LoadFromFile("qa_data/rsaes-oaep/cert.pem")
IF (nSuccess != 1)
    ? oCert:LastErrorText
    oJpgBytes:destroy()
    oCrypt:destroy()
    oCert:destroy()
    RETURN
ENDIF

//  Tell the crypt object to use the certificate.
oCrypt:SetEncryptCert(oCert)

//  Do the in-place RSAES-OAEP encryption.
//  The contents of jpgBytes are replaced with the CMS message.
nSuccess := oCrypt:EncryptBd(oJpgBytes)
IF (nSuccess != 1)
    ? oCrypt:LastErrorText
    oJpgBytes:destroy()
    oCrypt:destroy()
    oCert:destroy()
    RETURN
ENDIF

//  Examine the JPG bytes again.  The bytes should be different because they are encrypted:
? oJpgBytes:GetEncoded("base64_mime")

//  Sample CMS message:
//  This CMS message can be copy-and-pasted into the online web form
//  at https://lapo.it/asn1js/   to verify the algorithms used.

//  MIIFDAYJKoZIhvcNAQcDoIIE/TCCBPkCAQAxggGgMIIBnAIBADB1MGgxCzAJBgNVBAYTAlVTMQsw
//  CQYDVQQIDAJJTDEQMA4GA1UEBwwHV2hlYXRvbjEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQ
//  dHkgTHRkMRcwFQYDVQQDDA5DaGlsa2F0V2lkZ2V0cwIJAMRwugDmvniwMBwGCSqGSIb3DQEBBzAP
//  oA0wCwYJYIZIAWUDBAIBBIIBAHyWLgkJfIvoA3cYEAR/uHfA7uoi4eQXHl2woQAd6W5BbUNVBcYD
//  zuCTTOTWo1e7Uh0j0AhMZvVQf3+cngTiimzKwIZ2LNuNAgYOhrO/7coHyB22ImVetncUpCsAv/u7
//  2tYp1dO36T56K+2hMELwcQXTj6v5ODO6a3emdCjITCjHhlYePvq2l0HyU2ALG5RFB6ldk9imhKzn
//  6gfcijfH65S+KfMRlFBCXFu5nCBKmi8Ywo8Ue0rFssUDKLCjCeQNY52symiDbN/d06K/luOUwVhY
//  1KQffdIKmTrZUugw+FaoQRq0xGj39T/sYu8qCinNZu/vPdUmxcXszSaSVJ/LGwcwggNOBgkqhkiG
//  9w0BBwEwHQYJYIZIAWUDBAECBBDLnqRASqqnNUV2IiDkTRl/gIIDIPRaxdKEjhR5RD7pc7yI5j7N
//  TioZNvuMETdHWgHy7eOGz+1hP7fObk/RI0mtQx7IPEjkxaduNbXNzTpXAVRVj4Fw1zzXlqh9UPwt
//  p3TN3NsVRPQ5GmQ+cnPTSZD8i3i8ru8WFHyj1M6vyA0phrEGltKgqsZbb+OkuO5qG3laJv4XGkmn
//  039pPGSTydQzW+HAp/hsJZLEMwdngXToi854ytjEk+ahCkeOz+d2MAfXZAR+nBCkmAmCQ9SDVTqH
//  FVJOAV2WrKBqNv4+iMn63f7QeoVIjk0QTE8D2iRsUiFYjy4ICaUpplLJEewneH5l0W40KA2+mOep
//  lIrvWnaX2H8ltOEBGD6Jng7i6p/Q4Lr+Y+HBYIHsBPLox3A4NOh/b0MZcyBr/AV2CsIwkIUGLlYl
//  /3rnpl7dRTuHP+fe1lDQVLAxD+U0c73sW7vOALhEe2t2Ae3ayukWPRyfXK9FNHAMhcOI4stHNSwx
//  o2fHa+ctTpPh0V5CHY/ELAKKkrH3nW954pk52tc8Xt6CnzVO5ry/ndcmTlQA0PkG6CK98TE9hCTA
//  hBdSL4/gVFgi9c35I6VXieY9kJe5ICljw5Ftm5yqTwlJIxGU3Z/WeIYBF4uyMegG75AQ9Md9tX0h
//  w8OOu2b6sIvxOZ+durIrYQDlXUXU/IR9exzAlYFENNBPhBgtDsWKSx5gcp+32kC5wtSYSiy3JxNt
//  0W1yEJz8JGZXhuUvRXjwf+AjS4+/o82WTNXVLVKZ0TP50NVvtf9QqWuXvK/kDDPx6w+abK/aqdAs
//  QSL7wCxOosR2YUPWbXtwGhyHbIfAwWXijO2RnrqKeXL25Ywg16LQUTHq9Mlbgfw/tx3l5pjrmqFC
//  e9t9aaU6kDZqyyfRDOeWwkuDIsT90ulazbed2apgUXYj6AVVvMiC1pRld9wSuHH0vW0x5VsNbmXy
//  EY0NJlJY6II/1szy3bpiP6MsqFveCyCX8rM7UgGgpMNbvWPnsX0F/0eJywIrXrnQYXpvfgghIrlr
//  qu/ftXWypfcfvATxme+cN2EBsCDhq4VcMgB6JY3ykv6P8PK/QpMTbu4Y

//  To decrypt, we'll need the cert with private key.  
//  (The certificate alone contains only the public key.)
//  Provide the required cert + private key from a PFX (.pfx/.p12) file.
nSuccess := oCrypt:AddPfxSourceFile("qa_data/rsaes-oaep/cert_plus_privatekey.pfx", "PFX_PASSWORD")
IF (nSuccess != 1)
    ? oCrypt:LastErrorText
    oJpgBytes:destroy()
    oCrypt:destroy()
    oCert:destroy()
    RETURN
ENDIF

//  Decrypt to restore back to the original:
nSuccess := oCrypt:DecryptBd(oJpgBytes)
IF (nSuccess != 1)
    ? oCrypt:LastErrorText
    oJpgBytes:destroy()
    oCrypt:destroy()
    oCert:destroy()
    RETURN
ENDIF

? oJpgBytes:GetEncoded("base64_mime")

oJpgBytes:destroy()
oCrypt:destroy()
oCert:destroy()