Node.js

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.

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var pubkey = new chilkat.PublicKey();

    var sbPem = new chilkat.StringBuilder();
    var bCrlf = true;
    sbPem.AppendLine("-----BEGIN PUBLIC KEY-----",bCrlf);
    sbPem.AppendLine("MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF",bCrlf);
    sbPem.AppendLine("3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA",bCrlf);
    sbPem.AppendLine("04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s",bCrlf);
    sbPem.AppendLine("Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF",bCrlf);
    sbPem.AppendLine("wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE",bCrlf);
    sbPem.AppendLine("f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W",bCrlf);
    sbPem.AppendLine("SwIDAQAB",bCrlf);
    sbPem.AppendLine("-----END PUBLIC KEY-----",bCrlf);

    //  Load the public key object from the PEM. 
    success = pubkey.LoadFromString(sbPem.GetAsString());
    if (success == false) {
        console.log(pubkey.LastErrorText);
        return;
    }

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

    //  First we SHA-256 hash the original data.
    var crypt = new chilkat.Crypt2();
    crypt.HashAlgorithm = "SHA-256";

    hashBytes = crypt.HashString(originalData);

    //  Now to RSA encrypt using OAEP padding with SHA-256 for the mask function.
    var rsa = new chilkat.Rsa();
    rsa.PkcsPadding = false;
    rsa.OaepHash = "SHA256";
    rsa.UsePublicKey(pubkey);
    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.
    var bUsePrivateKey = false;
    var encryptedStr = rsa.EncryptBytesENC(hashBytes,bUsePrivateKey);
    if (rsa.LastMethodSuccess == false) {
        console.log(rsa.LastErrorText);
        return;
    }

    console.log("Base64 RSA encrypted output: " + encryptedStr);

}

chilkatExample();