static int test_blkcipher(void)
{
	struct crypto_blkcipher *blkcipher = NULL;
	char *cipher = "cbc(aes)";
	// AES 128
	charkey =
"\x12\x34\x56\x78\x90\xab\xcd\xef\x12\x34\x56\x78\x90\xab\xcd\xef";
	chariv =
"\x12\x34\x56\x78\x90\xab\xcd\xef\x12\x34\x56\x78\x90\xab\xcd\xef";
	unsigned int ivsize = 0;
	char *scratchpad = NULL; // holds plaintext and ciphertext
	struct scatterlist sg;
	struct blkcipher_desc desc;
	int ret = -EFAULT;

	blkcipher = crypto_alloc_blkcipher(cipher, 0, 0);
	if (IS_ERR(blkcipher)) {
		printk("could not allocate blkcipher handle for %s\n", cipher);
		return -PTR_ERR(blkcipher);
	}

	if (crypto_blkcipher_setkey(blkcipher, key, strlen(key))) {
		printk("key could not be set\n");
		ret = -EAGAIN;
		goto out;
	}

	ivsize = crypto_blkcipher_ivsize(blkcipher);
	if (ivsize) {
		if (ivsize != strlen(iv))
			printk("IV length differs from expected length\n");
		crypto_blkcipher_set_iv(blkcipher, iv, ivsize);
	}

	scratchpad = kmalloc(crypto_blkcipher_blocksize(blkcipher), GFP_KERNEL);
	if (!scratchpad) {
		printk("could not allocate scratchpad for %s\n", cipher);
		goto out;
	}
	/* get some random data that we want to encrypt */
	get_random_bytes(scratchpad, crypto_blkcipher_blocksize(blkcipher));

	desc.flags = 0;
	desc.tfm = blkcipher;
	sg_init_one(&sg, scratchpad, crypto_blkcipher_blocksize(blkcipher));

	/* encrypt data in place */
	crypto_blkcipher_encrypt(&desc, &sg, &sg,
				 crypto_blkcipher_blocksize(blkcipher));

	/* decrypt data in place
	 * crypto_blkcipher_decrypt(&desc, &sg, &sg,
	 */			 crypto_blkcipher_blocksize(blkcipher));


	printk("Cipher operation completed\n");
	return 0;

out:
	if (blkcipher)
		crypto_free_blkcipher(blkcipher);
	if (scratchpad)
		kzfree(scratchpad);
	return ret;
}