(DataFlex) 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

Use ChilkatAx-win32.pkg

Procedure Test
    Variant vPubkey
    Handle hoPubkey
    Handle hoSbPem
    Boolean iBCrlf
    Boolean iSuccess
    Boolean iSuccess
    String sOriginalData
    Handle hoCrypt
    String sHashBase64
    Handle hoRsa
    Boolean iBUsePrivateKey
    String sEncryptedStr
    String sTemp1
    Boolean bTemp1

    // 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.

    Get Create (RefClass(cComChilkatPublicKey)) To hoPubkey
    If (Not(IsComObjectCreated(hoPubkey))) Begin
        Send CreateComObject of hoPubkey
    End

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbPem
    If (Not(IsComObjectCreated(hoSbPem))) Begin
        Send CreateComObject of hoSbPem
    End
    Move True To iBCrlf
    Get ComAppendLine Of hoSbPem "-----BEGIN PUBLIC KEY-----" iBCrlf To iSuccess
    Get ComAppendLine Of hoSbPem "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF" iBCrlf To iSuccess
    Get ComAppendLine Of hoSbPem "3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA" iBCrlf To iSuccess
    Get ComAppendLine Of hoSbPem "04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s" iBCrlf To iSuccess
    Get ComAppendLine Of hoSbPem "Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF" iBCrlf To iSuccess
    Get ComAppendLine Of hoSbPem "wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE" iBCrlf To iSuccess
    Get ComAppendLine Of hoSbPem "f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W" iBCrlf To iSuccess
    Get ComAppendLine Of hoSbPem "SwIDAQAB" iBCrlf To iSuccess
    Get ComAppendLine Of hoSbPem "-----END PUBLIC KEY-----" iBCrlf To iSuccess

    // Load the public key object from the PEM. 
    Get ComGetAsString Of hoSbPem To sTemp1
    Get ComLoadFromString Of hoPubkey sTemp1 To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoPubkey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Move "This is the original data to be SHA-256 hashed and RSA encrypted." To sOriginalData

    // First we SHA-256 hash the original data to get the hash in base64 format:
    Get Create (RefClass(cComChilkatCrypt2)) To hoCrypt
    If (Not(IsComObjectCreated(hoCrypt))) Begin
        Send CreateComObject of hoCrypt
    End
    Set ComHashAlgorithm Of hoCrypt To "SHA-256"
    Set ComEncodingMode Of hoCrypt To "base64"
    Get ComHashStringENC Of hoCrypt sOriginalData To sHashBase64

    // Setup RSA to use OAEP padding with SHA-1 for the mask function.
    Get Create (RefClass(cComChilkatRsa)) To hoRsa
    If (Not(IsComObjectCreated(hoRsa))) Begin
        Send CreateComObject of hoRsa
    End
    Set ComOaepPadding Of hoRsa To True
    Set ComOaepHash Of hoRsa To "SHA1"
    Get pvComObject of hoPubkey to vPubkey
    Get ComImportPublicKeyObj Of hoRsa vPubkey To iSuccess
    Set ComEncodingMode Of hoRsa To "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).
    Set ComCharset Of hoRsa To "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.
    Move False To iBUsePrivateKey
    Get ComEncryptStringENC Of hoRsa sHashBase64 iBUsePrivateKey To sEncryptedStr
    Get ComLastMethodSuccess Of hoRsa To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoRsa To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Base64 RSA encrypted output: " sEncryptedStr


End_Procedure