Bitwise shifting array of char's

Question

I have got an array of chars that I\'m trying to bitwise shift right >>, then & with another array. I think I have got the wrong idea of

Answer 1

/**
 * shift a number of bits to the right
 *
 * @param   SRC         the array to shift
 * @param   len         the length of the array
 * @param   shift       the number of consecutive bits to shift
 *
*/
static void shift_bits_right(uint8_t SRC[], uint16_t len, uint32_t shift) {
    uint32_t i = 0;

    uint8_t start = shift / 8;
    uint8_t rest = shift % 8;
    uint8_t previous = 0;

    for(i = 0; i < len; i++) {
        if(start <= i) {
            previous = SRC[i - start];
        }
        uint8_t value = (previous << (8 - rest)) | SRC[i + start] >> rest;
        SRC[i + start] = value;
    }
}