Node.js

Manually Duplicate SetSecretKeyViaPassword

Demonstrates how to duplicate the password string to binary secret key computation of SetSecretKeyViaPassword.

This is a cryptographically weak way of generating a secret key from a password. The SetSecretKeyViaPassword method is deprecated and should not be used.

Node.js

NODEJS_PRELUDE

function chilkatExample() {

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

    var crypt = new chilkat.Crypt2();

    //  The password string is transformed to a binary secret key by computing the 
    //  MD5 digest (of the utf-8 password) to obtain 16 bytes.  
    //  If the KeyLength is greater than 16 bytes, then the MD5 digest of the Base64 encoding 
    //  of the utf-8 password is added.  A max of 32 bytes of key material is generated, and 
    //  this is truncated to the actual KeyLength required.

    crypt.CryptAlgorithm = "aes";
    crypt.KeyLength = 256;

    var password = "this is my password";
    crypt.SetSecretKeyViaPassword(password);

    //  Examine the resulting SecretKey in hex:
    console.log("Computed Secret Key = " + crypt.GetEncodedKey("hex"));

    //  Now perform the same computation manually:
    var sb = new chilkat.StringBuilder();

    crypt.HashAlgorithm = "md5";
    crypt.Charset = "utf-8";
    crypt.EncodingMode = "hex";
    sb.Append(crypt.HashStringENC(password));

    var passwordBase64 = crypt.EncodeString(password,"utf-8","base64");
    sb.Append(crypt.HashStringENC(passwordBase64));

    console.log("Manually Computed = " + sb.GetAsString());

    //  The output is:
    //  Computed Secret Key = 210D53992DFF432EC1B1A9698AF9DA16C7E90518F90E24828F78EC9E0A413B36
    //  Manually Computed = 210D53992DFF432EC1B1A9698AF9DA16C7E90518F90E24828F78EC9E0A413B36

}

chilkatExample();