* @brief blake2b mixing function G * * Shuffles values in block v depending on * provided indeces a, b, c, and d. x and y * are also mixed into the block. * * @param v array of words to be mixed * @param a first index * @param b second index * @param c third index * @param d fourth index * @param x first word being mixed into v * @param y second word being mixed into y * * @returns v
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