Function cipher_array_alloc_init

crypto/test/cipher_driver.c:434–491

 */

srtp_err_status_t cipher_array_alloc_init(srtp_cipher_t ***ca,
                                          int num_ciphers,
                                          srtp_cipher_type_t *ctype,
                                          int klen)
{
    int i, j;
    srtp_err_status_t status;
    uint8_t *key = NULL;
    srtp_cipher_t **cipher_array;
    /* pad klen allocation, to handle aes_icm reading 16 bytes for the
       14-byte salt */
    int klen_pad = ((klen + 15) >> 4) << 4;

    /* allocate array of pointers to ciphers */
    cipher_array = (srtp_cipher_t **)srtp_crypto_alloc(sizeof(srtp_cipher_t *) *
                                                       num_ciphers);
    if (cipher_array == NULL)
        return srtp_err_status_alloc_fail;

    /* set ca to location of cipher_array */
    *ca = cipher_array;

    /* allocate key , allow zero key for example null cipher */
    if (klen_pad > 0) {
        key = srtp_crypto_alloc(klen_pad);
        if (key == NULL) {
            srtp_crypto_free(cipher_array);
            return srtp_err_status_alloc_fail;
        }
    }

    /* allocate and initialize an array of ciphers */
    for (i = 0; i < num_ciphers; i++) {
        /* allocate cipher */
        status = srtp_cipher_type_alloc(ctype, cipher_array, klen, 16);
        if (status)
            return status;

        /* generate random key and initialize cipher */
        srtp_cipher_rand_for_tests(key, klen);
        for (j = klen; j < klen_pad; j++)
            key[j] = 0;
        status = srtp_cipher_init(*cipher_array, key);
        if (status)
            return status;

        /*     printf("%dth cipher is at %p\n", i, *cipher_array); */
        /*     printf("%dth cipher description: %s\n", i,  */
        /* 	   (*cipher_array)->type->description); */

        /* advance cipher array pointer */
        cipher_array++;
    }

    srtp_crypto_free(key);

    return srtp_err_status_ok;
}