Function cipher_array_bits_per_second

crypto/test/cipher_driver.c:519–563

 */

uint64_t cipher_array_bits_per_second(srtp_cipher_t *cipher_array[],
                                      int num_cipher,
                                      unsigned octets_in_buffer,
                                      int num_trials)
{
    int i;
    v128_t nonce;
    clock_t timer;
    unsigned char *enc_buf;
    int cipher_index = srtp_cipher_rand_u32_for_tests() % num_cipher;

    /* Over-alloc, for NIST CBC padding */
    enc_buf = srtp_crypto_alloc(octets_in_buffer + 17);
    if (enc_buf == NULL)
        return 0; /* indicate bad parameters by returning null */

    /* time repeated trials */
    v128_set_to_zero(&nonce);
    timer = clock();
    for (i = 0; i < num_trials; i++, nonce.v32[3] = i) {
        /* length parameter to srtp_cipher_encrypt is in/out -- out is total,
         * padded
         * length -- so reset it each time. */
        unsigned octets_to_encrypt = octets_in_buffer;

        /* encrypt buffer with cipher */
        srtp_cipher_set_iv(cipher_array[cipher_index], (uint8_t *)&nonce,
                           srtp_direction_encrypt);
        srtp_cipher_encrypt(cipher_array[cipher_index], enc_buf,
                            &octets_to_encrypt);

        /* choose a cipher at random from the array*/
        cipher_index = (*((uint32_t *)enc_buf)) % num_cipher;
    }
    timer = clock() - timer;

    srtp_crypto_free(enc_buf);

    if (timer == 0) {
        /* Too fast! */
        return 0;
    }

    return (uint64_t)CLOCKS_PER_SEC * num_trials * 8 * octets_in_buffer / timer;
}

void cipher_array_test_throughput(srtp_cipher_t *ca[], int num_cipher)
{