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 *
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 *       notice, this list of conditions and the following disclaimer.
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 *       the documentation and/or other materials provided with the
 *       distribution.
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 *       from this software without specific prior written permission.
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 */

#ifndef SPDK_VBDEV_CRYPTO_H
#define SPDK_VBDEV_CRYPTO_H

#include "spdk/rpc.h"
#include "spdk/util.h"
#include "spdk/string.h"
#include "spdk/log.h"

#include "spdk/bdev.h"

#define AESNI_MB "crypto_aesni_mb"
#define QAT "crypto_qat"
#define QAT_ASYM "crypto_qat_asym"
#define MLX5 "mlx5_pci"

/* Supported ciphers */
#define AES_CBC "AES_CBC" /* QAT and AESNI_MB */
#define AES_XTS "AES_XTS" /* QAT and MLX5 */

typedef void (*spdk_delete_crypto_complete)(void *cb_arg, int bdeverrno);

/**
 * Create new crypto bdev.
 *
 * \param bdev_name Name of the bdev on which the crypto vbdev will be created.
 * \param vbdev_name Name of the new crypto vbdev.
 * \param crypto_pmd Name of the polled mode driver to use for this vbdev.
 * \param key The key to use for this vbdev.
 * \param cipher The cipher to use for this vbdev.
 * \param keys The 2nd key to use for AES_XTS cipher.
 * \return 0 on success, other on failure.
 */
int create_crypto_disk(const char *bdev_name, const char *vbdev_name,
		       const char *crypto_pmd, const char *key,
		       const char *cipher, const char *key2);

/**
 * Delete crypto bdev.
 *
 * \param bdev Pointer to crypto bdev.
 * \param cb_fn Function to call after deletion.
 * \param cb_arg Argument to pass to cb_fn.
 */
void delete_crypto_disk(struct spdk_bdev *bdev, spdk_delete_crypto_complete cb_fn,
			void *cb_arg);

static inline int
__c2v(char c)
{
	if ((c >= '0') && (c <= '9')) {
		return c - '0';
	}
	if ((c >= 'a') && (c <= 'f')) {
		return c - 'a' + 10;
	}
	if ((c >= 'A') && (c <= 'F')) {
		return c - 'A' + 10;
	}
	return -1;
}

static inline char
__v2c(int c)
{
	const char hexchar[] = "0123456789abcdef";
	if (c < 0 || c > 15) {
		return -1;
	}
	return hexchar[c];
}

/**
 * Convert a binary array to hexlified string terminated by zero.
 *
 * \param bin A binary array pointer.
 * \param len Length of the binary array.
 * \return Pointer to hexlified version of @bin or NULL on failure.
 */
static inline char *
hexlify(const char *bin, size_t len)
{
	char *hex, *phex;

	hex = malloc((len * 2) + 1);
	if (hex == NULL) {
		return NULL;
	}
	phex = hex;
	for (size_t i = 0; i < len; i++) {
		char c0 = __v2c((bin[i] >> 4) & 0x0f);
		char c1 = __v2c((bin[i]) & 0x0f);
		if (c0 < 0 || c1 < 0) {
			assert(false);
			free(hex);
			return NULL;
		}
		*phex++ = c0;
		*phex++ = c1;
	}
	*phex = '\0';
	return hex;
}

/**
 * Convert hexlified string to binary array of size strlen(hex) / 2.
 *
 * \param hex A hexlified string terminated by zero.
 * \return Binary array pointer or NULL on failure.
 */
static inline char *
unhexlify(const char *hex)
{
	char *res, *pres;
	size_t len = strlen(hex);

	if (len % 2 != 0) {
		SPDK_ERRLOG("Invalid hex string len %d. It must be mod of 2.\n", (int)len);
		return NULL;
	}
	res = malloc(len / 2);
	if (res == NULL) {
		return NULL;
	}
	pres = res;
	for (size_t i = 0; i < len; i += 2) {
		int v0 = __c2v(hex[i]);
		int v1 = __c2v(hex[i + 1]);
		if (v0 < 0 || v1 < 0) {
			SPDK_ERRLOG("Invalid hex string \"%s\"\n", hex);
			free(res);
			return NULL;
		}
		*pres++ = (v0 << 4) + v1;
	}
	return res;
}

#endif /* SPDK_VBDEV_CRYPTO_H */