Issue with Speck cipher on Arduino UNO

Question

I found a library for the Speck cipher here: https://github.com/Chien-Ning/ArduinoCrypto

And I'm trying to use but haven't had much luck. My code is the following:

#include <SPECK_AVR.h>
#include <SPECK_spec.h>

#include "SPECK_AVR.h"

void setup() {
  // put your setup code here, to run once:

  SpeckTxtLen = 32;
  SpeckKeyLen = 64;
  speckTxtKey[]= 0x65, 0x74, 0x69, 0x4c, 0x19, 0x18, 0x11, 0x10, 0x09, 0x08, 0x01, 0x00;

  speckKey();
  speckEnc();

  Serial.println("");
  for (int i = 0; i < SpeckTxtLen/8; i++){
  Serial.print(speckTxtKey[i], HEX);
  Serial.print(", ");
  }
}

void loop() {
  // put your main code here, to run repeatedly:

}

And I'm getting this error:

error: lvalue required as left operand of assignment

and

error: expected primary-expression before ']' token

Do you think I'm missing something in the usage of this library?

Thanks in advance

gre_gor · Accepted Answer · 2017-05-23 22:45:14Z

3

speckTxtKey[]= 0x65, 0x74, 0x69, 0x4c, 0x19, 0x18, 0x11, 0x10, 0x09, 0x08, 0x01, 0x00;

That's not how you assign an array.
And you never defined a type for the array.

It sould be:

byte speckTxtKey[] = {0x65, 0x74, 0x69, 0x4c, 0x19, 0x18, 0x11, 0x10, 0x09, 0x08, 0x01, 0x00};

EDIT:

I checked the source of the library to figure out how to use it, but it doesn't seem the library is meant for actual use.

SpeckTxtLen and SpeckKeyLen are macros inside SPECK_AVR.h, which are supposed to be changed there, not in your code.

The library also defines speckTxtKey inside SPECKenc_AVR.cpp with predefined test data based on the chosen length.

This library looks like a test implementation of the speck cipher, which was just dumped onto GitHub.

edited May 23, 2017 at 22:45

answered May 23, 2017 at 16:14

gre_gor

1,6824 gold badges18 silver badges30 bronze badges

Thanks, I got rid of my error with this, but now I'm getting others, but I think it's related to the library. Should I post another question with respect to them?

Luz A
– Luz A

2017-05-23 18:54:21 +00:00
Commented May 23, 2017 at 18:54
False alarm, I'm still getting the "error: lvalue required as left operand of assignment". The other error is gone, but still with the one I mentioned.

Luz A
– Luz A

2017-05-23 20:13:02 +00:00
Commented May 23, 2017 at 20:13
@LuzA I now checked the source code of the library and it doesn't look like it's meant to be used for arbitrary data without modifications.

gre_gor
– gre_gor

2017-05-23 22:47:31 +00:00
Commented May 23, 2017 at 22:47
so I need to change the key and everything directly into the .h and .cpp files?

Luz A
– Luz A

2017-05-24 15:01:53 +00:00
Commented May 24, 2017 at 15:01

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