bootstrapAndEqual crashes when 1-slotted ciphers

[jayavanth]

#include "../src/HEAAN.h"
#include "../src/SchemeAlgo.h"

int main(int argc, char **argv)
{

    long logq = 1200;  
    long logp = 50;    
    long logSlots = 2; 
    long logT = 2;     
    long logI = 4;
    long logQ = 1200;
    long boot_logq = 62;

    srand(time(NULL));
    SetNumThreads(8);
    TimeUtils timeutils;
    Ring ring;
    SecretKey secretKey(ring);
    Scheme scheme(secretKey, ring);

    timeutils.start("Key generating");
    scheme.addBootKey(secretKey, logSlots, boot_logq + logI);
    timeutils.stop("Key generated");

    long slots = (1 << logSlots);
    vector<double> mval = {1.0, 2.0, 3.0, 4.0};
    Ciphertext cipher;
    Ciphertext cipherArray[slots];

    scheme.encrypt(cipher, &mval.front(), slots, logp, logq);

    for (long i=0 ; i < slots ; i++)
       scheme.encrypt(cipherArray[i], &mval[i], 1, logp, logq);

    scheme.bootstrapAndEqual(cipherArray[0], boot_logq, logQ, logT, logI);
    // scheme.bootstrapAndEqual(cipher, boot_logq, logQ, logT, logI);

    return 0;
}

This code crashes. But if you comment the boostrapping of cipherArray[0] and uncomment that of cipher, it works fine. Does boostrapping have to be done on ciphers with slots of powers of two that are greater than 0? (logSlots >=1 ?)

[jayavanth]

Oh I figured it out. I need to create a bootkey for that particular size of slots of ciphertext. E.g create a boot key for logSlots of size 0 if I want to bootstrap 1-slotted ciphers