PowerBuilder Requires Chilkat v11.0.0+

RSA Encrypt with SHA-256 hash function and SHA-256 mask function

See more RSA Examples

How can this Javascript be duplicated using Chilkat?

function a(e, t) {
                var r = s.pki.publicKeyFromPem(e)
                  , n = r.encrypt(t, "RSA-OAEP", {
                    md: s.md.sha256.create(),
                    mgf1: {
                        md: s.md.sha1.create()
                    }
                });
                return s.util.encode64(n)
            }

Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens, even using the same data and key, the result will be different -- but still valid. One should not expect to get the same output.

PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Pubkey
oleobject loo_SbPem
integer li_BCrlf
string ls_OriginalData
oleobject loo_Crypt
oleobject loo_Rsa
integer li_BUsePrivateKey
string ls_EncryptedStr

li_Success = 0

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

loo_Pubkey = create oleobject
li_rc = loo_Pubkey.ConnectToNewObject("Chilkat.PublicKey")
if li_rc < 0 then
    destroy loo_Pubkey
    MessageBox("Error","Connecting to COM object failed")
    return
end if

loo_SbPem = create oleobject
li_rc = loo_SbPem.ConnectToNewObject("Chilkat.StringBuilder")

li_BCrlf = 1
loo_SbPem.AppendLine("-----BEGIN PUBLIC KEY-----",li_BCrlf)
loo_SbPem.AppendLine("MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF",li_BCrlf)
loo_SbPem.AppendLine("3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA",li_BCrlf)
loo_SbPem.AppendLine("04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s",li_BCrlf)
loo_SbPem.AppendLine("Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF",li_BCrlf)
loo_SbPem.AppendLine("wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE",li_BCrlf)
loo_SbPem.AppendLine("f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W",li_BCrlf)
loo_SbPem.AppendLine("SwIDAQAB",li_BCrlf)
loo_SbPem.AppendLine("-----END PUBLIC KEY-----",li_BCrlf)

//  Load the public key object from the PEM. 
li_Success = loo_Pubkey.LoadFromString(loo_SbPem.GetAsString())
if li_Success = 0 then
    Write-Debug loo_Pubkey.LastErrorText
    destroy loo_Pubkey
    destroy loo_SbPem
    return
end if

ls_OriginalData = "This is the original data to be SHA-256 hashed and RSA encrypted."

//  First we SHA-256 hash the original data.
loo_Crypt = create oleobject
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")

loo_Crypt.HashAlgorithm = "SHA-256"

loo_HashBytes = loo_Crypt.HashString(ls_OriginalData)

//  Now to RSA encrypt using OAEP padding with SHA-256 for the mask function.
loo_Rsa = create oleobject
li_rc = loo_Rsa.ConnectToNewObject("Chilkat.Rsa")

loo_Rsa.PkcsPadding = 0
loo_Rsa.OaepHash = "SHA256"
loo_Rsa.UsePublicKey(loo_Pubkey)
loo_Rsa.EncodingMode = "base64"

//  Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens,
//  even using the same data and key, the result will be different --  but still valid.  One should not expect
//  to get the same output.
li_BUsePrivateKey = 0
ls_EncryptedStr = loo_Rsa.EncryptBytesENC(loo_HashBytes,li_BUsePrivateKey)
if loo_Rsa.LastMethodSuccess = 0 then
    Write-Debug loo_Rsa.LastErrorText
    destroy loo_Pubkey
    destroy loo_SbPem
    destroy loo_Crypt
    destroy loo_Rsa
    return
end if

Write-Debug "Base64 RSA encrypted output: " + ls_EncryptedStr


destroy loo_Pubkey
destroy loo_SbPem
destroy loo_Crypt
destroy loo_Rsa