(Visual FoxPro) RSA Encrypt Hash using SHA256 hash function and SHA1 mask function

Note: This example requires a feature introduced in Chilkat v9.5.0.66

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.

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

LOCAL loPubkey
LOCAL loSbPem
LOCAL lnBCrlf
LOCAL lnSuccess
LOCAL lcOriginalData
LOCAL loCrypt
LOCAL lcHashBase64
LOCAL loRsa
LOCAL lnBUsePrivateKey
LOCAL lcEncryptedStr

* Note: This example requires a feature introduced in Chilkat v9.5.0.66

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PublicKey')
loPubkey = CreateObject('Chilkat.PublicKey')

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbPem = CreateObject('Chilkat.StringBuilder')
lnBCrlf = 1
loSbPem.AppendLine("-----BEGIN PUBLIC KEY-----",lnBCrlf)
loSbPem.AppendLine("MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF",lnBCrlf)
loSbPem.AppendLine("3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA",lnBCrlf)
loSbPem.AppendLine("04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s",lnBCrlf)
loSbPem.AppendLine("Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF",lnBCrlf)
loSbPem.AppendLine("wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE",lnBCrlf)
loSbPem.AppendLine("f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W",lnBCrlf)
loSbPem.AppendLine("SwIDAQAB",lnBCrlf)
loSbPem.AppendLine("-----END PUBLIC KEY-----",lnBCrlf)

* Load the public key object from the PEM. 
lnSuccess = loPubkey.LoadFromString(loSbPem.GetAsString())
IF (lnSuccess <> 1) THEN
    ? loPubkey.LastErrorText
    RELEASE loPubkey
    RELEASE loSbPem
    CANCEL
ENDIF

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

* First we SHA-256 hash the original data to get the hash in base64 format:
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2')
loCrypt = CreateObject('Chilkat.Crypt2')
loCrypt.HashAlgorithm = "SHA-256"
loCrypt.EncodingMode = "base64"
lcHashBase64 = loCrypt.HashStringENC(lcOriginalData)

* Setup RSA to use OAEP padding with SHA-1 for the mask function.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rsa')
loRsa = CreateObject('Chilkat.Rsa')
loRsa.OaepPadding = 1
loRsa.OaepHash = "SHA1"
loRsa.ImportPublicKeyObj(loPubkey)
loRsa.EncodingMode = "base64"

* Starting in v9.5.0.66, we can provide a binary encoding mode, such as "base64", "hex", "base64url", etc.
* for the Charset property.   The Charset property was previously limited to character encodings, such as
* "utf-8", "iso-8859-1", etc.  If a binary encoding is used, then the string passed in is decoded to the binary
* bytes as indicated.  (If an actual charset, such as "utf-8" is used, then the input string is converted to the
* byte representation of the charset, and then encrypted.)

* Given that a hash is composed of non-text binary bytes, we'll set the Charset property equal to "base64" 
* (because we have the base64 hash from above).
loRsa.Charset = "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.
lnBUsePrivateKey = 0
lcEncryptedStr = loRsa.EncryptStringENC(lcHashBase64,lnBUsePrivateKey)
IF (loRsa.LastMethodSuccess <> 1) THEN
    ? loRsa.LastErrorText
    RELEASE loPubkey
    RELEASE loSbPem
    RELEASE loCrypt
    RELEASE loRsa
    CANCEL
ENDIF

? "Base64 RSA encrypted output: " + lcEncryptedStr

RELEASE loPubkey
RELEASE loSbPem
RELEASE loCrypt
RELEASE loRsa