C++

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.

C++

#include <CkCrypt2.h>
#include <CkStringBuilder.h>

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

    CkCrypt2 crypt;

    //  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.put_CryptAlgorithm("aes");
    crypt.put_KeyLength(256);

    const char *password = "this is my password";
    crypt.SetSecretKeyViaPassword(password);

    //  Examine the resulting SecretKey in hex:
    std::cout << "Computed Secret Key = " << crypt.getEncodedKey("hex") << "\r\n";

    //  Now perform the same computation manually:
    CkStringBuilder sb;

    crypt.put_HashAlgorithm("md5");
    crypt.put_Charset("utf-8");
    crypt.put_EncodingMode("hex");
    sb.Append(crypt.hashStringENC(password));

    const char *passwordBase64 = crypt.encodeString(password,"utf-8","base64");
    sb.Append(crypt.hashStringENC(passwordBase64));

    std::cout << "Manually Computed = " << sb.getAsString() << "\r\n";

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