(PowerBuilder) RSA Encrypt RSA/ECB/OAEPWithSHA1AndMGF1Padding

Demonstrates how to RSA encrypt using RSA/ECB/OAEPWithSHA1AndMGF1Padding. Also demonstrates RSA/ECB/OAEPWithSHA-256AndMGF1Padding. Both of these terms are from Java's JCE. Note: In this context, "ECB" doesn't actually mean anything. It's a symmetric cipher mode that doesn't apply (or make sense) in this context.

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

integer li_rc
oleobject loo_Rsa
oleobject loo_Pubkey
integer li_Success
string ls_PlainText
integer li_UsePrivateKey
string ls_EncryptedStr
oleobject loo_Rsa2
oleobject loo_PrivKey
string ls_OriginalStr

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

loo_Rsa = create oleobject
// Use "Chilkat_9_5_0.Rsa" for versions of Chilkat < 10.0.0
li_rc = loo_Rsa.ConnectToNewObject("Chilkat.Rsa")
if li_rc < 0 then
    destroy loo_Rsa
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// First load a public key object with a public key.
// In this case, we'll load it from a file.
loo_Pubkey = create oleobject
// Use "Chilkat_9_5_0.PublicKey" for versions of Chilkat < 10.0.0
li_rc = loo_Pubkey.ConnectToNewObject("Chilkat.PublicKey")

li_Success = loo_Pubkey.LoadFromFile("qa_data/pem/rsa_public.pem")
if li_Success <> 1 then
    Write-Debug loo_Pubkey.LastErrorText
    destroy loo_Rsa
    destroy loo_Pubkey
    return
end if

// RSA encryption is limited to small amounts of data. The limit
// is typically a few hundred bytes and is based on the key size and
// padding (OAEP vs. PKCS1_5).  RSA encryption is typically used for
// encrypting hashes or symmetric (bulk encryption algorithm) secret keys.
ls_PlainText = "Time is an illusion. Lunchtime doubly so."

// Import the public key to be used for encrypting.
li_Success = loo_Rsa.ImportPublicKeyObj(loo_Pubkey)

// To get OAEP padding, set the OaepPadding property:
loo_Rsa.OaepPadding = 1

// To use SHA1 or SHA-256, set the OaepHash property
loo_Rsa.OaepHash = "sha256"
// for SHA1 --
loo_Rsa.OaepHash = "sha1"

// Indicate we'll want hex output
loo_Rsa.EncodingMode = "hex"

// Encrypt..
li_UsePrivateKey = 0
ls_EncryptedStr = loo_Rsa.EncryptStringENC(ls_PlainText,li_UsePrivateKey)
Write-Debug ls_EncryptedStr

// -------------------------------------------------
// Now decrypt with the matching private key.
loo_Rsa2 = create oleobject
// Use "Chilkat_9_5_0.Rsa" for versions of Chilkat < 10.0.0
li_rc = loo_Rsa2.ConnectToNewObject("Chilkat.Rsa")

loo_PrivKey = create oleobject
// Use "Chilkat_9_5_0.PrivateKey" for versions of Chilkat < 10.0.0
li_rc = loo_PrivKey.ConnectToNewObject("Chilkat.PrivateKey")

li_Success = loo_PrivKey.LoadEncryptedPem("qa_data/pem/rsa_passwd.pem","passwd")
if li_Success <> 1 then
    Write-Debug loo_PrivKey.LastErrorText
    destroy loo_Rsa
    destroy loo_Pubkey
    destroy loo_Rsa2
    destroy loo_PrivKey
    return
end if

li_Success = loo_Rsa2.ImportPrivateKeyObj(loo_PrivKey)

// Make sure we have the same settings used for encryption.
loo_Rsa2.OaepPadding = 1
loo_Rsa2.EncodingMode = "hex"
loo_Rsa2.OaepHash = "sha1"

ls_OriginalStr = loo_Rsa2.DecryptStringENC(ls_EncryptedStr,1)

Write-Debug ls_OriginalStr


destroy loo_Rsa
destroy loo_Pubkey
destroy loo_Rsa2
destroy loo_PrivKey