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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-04-25 tyx the first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include <hw_symmetric.h>
/**
* @brief Creating Symmetric Encryption and Decryption Context
*
* @param device Hardware crypto device
* @param type Type of symmetric crypto context
*
* @return Symmetric crypto context
*/
struct rt_hwcrypto_ctx *rt_hwcrypto_symmetric_create(struct rt_hwcrypto_device *device, hwcrypto_type type)
{
struct rt_hwcrypto_ctx *ctx;
ctx = rt_hwcrypto_ctx_create(device, type, sizeof(struct hwcrypto_symmetric));
return ctx;
}
/**
* @brief Destroy Symmetric Encryption and Decryption Context
*
* @param ctx Symmetric crypto context
*/
void rt_hwcrypto_symmetric_destroy(struct rt_hwcrypto_ctx *ctx)
{
rt_hwcrypto_ctx_destroy(ctx);
}
/**
* @brief This function performs a symmetric encryption or decryption operation
*
* @param ctx Symmetric crypto context
* @param mode Operation mode. HWCRYPTO_MODE_ENCRYPT or HWCRYPTO_MODE_DECRYPT
* @param length The length of the input data in Bytes. This must be a multiple of the block size
* @param in The buffer holding the input data
* @param out The buffer holding the output data
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_symmetric_crypt(struct rt_hwcrypto_ctx *ctx, hwcrypto_mode mode, rt_size_t length, const rt_uint8_t *in, rt_uint8_t *out)
{
struct hwcrypto_symmetric *symmetric_ctx;
struct hwcrypto_symmetric_info symmetric_info;
rt_err_t err;
if (ctx == RT_NULL)
{
return -RT_EINVAL;
}
symmetric_ctx = (struct hwcrypto_symmetric *)ctx;
if (symmetric_ctx->ops->crypt == RT_NULL)
{
return -RT_ERROR;
}
if (mode != HWCRYPTO_MODE_ENCRYPT && mode != HWCRYPTO_MODE_DECRYPT)
{
return -RT_EINVAL;
}
/* Input information packaging */
symmetric_info.mode = mode;
symmetric_info.in = in;
symmetric_info.out = out;
symmetric_info.length = length;
/* Calling Hardware Encryption and Decryption Function */
err = symmetric_ctx->ops->crypt(symmetric_ctx, &symmetric_info);
/* clean up flags */
symmetric_ctx->flags &= ~(SYMMTRIC_MODIFY_KEY | SYMMTRIC_MODIFY_IV | SYMMTRIC_MODIFY_IVOFF);
return err;
}
/**
* @brief Set Symmetric Encryption and Decryption Key
*
* @param ctx Symmetric crypto context
* @param key The crypto key
* @param bitlen The crypto key bit length
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_symmetric_setkey(struct rt_hwcrypto_ctx *ctx, const rt_uint8_t *key, rt_uint32_t bitlen)
{
struct hwcrypto_symmetric *symmetric_ctx;
if (ctx && bitlen <= RT_HWCRYPTO_KEYBIT_MAX_SIZE)
{
symmetric_ctx = (struct hwcrypto_symmetric *)ctx;
rt_memcpy(symmetric_ctx->key, key, bitlen >> 3);
/* Record key length */
symmetric_ctx->key_bitlen = bitlen;
/* Key change flag set up */
symmetric_ctx->flags |= SYMMTRIC_MODIFY_KEY;
return RT_EOK;
}
return -RT_EINVAL;
}
/**
* @brief Get Symmetric Encryption and Decryption Key
*
* @param ctx Symmetric crypto context
* @param key The crypto key buffer
* @param bitlen The crypto key bit length
*
* @return Key length of copy
*/
int rt_hwcrypto_symmetric_getkey(struct rt_hwcrypto_ctx *ctx, rt_uint8_t *key, rt_uint32_t bitlen)
{
struct hwcrypto_symmetric *symmetric_ctx = (struct hwcrypto_symmetric *)ctx;
if (ctx && bitlen >= symmetric_ctx->key_bitlen)
{
rt_memcpy(key, symmetric_ctx->key, symmetric_ctx->key_bitlen >> 3);
return symmetric_ctx->key_bitlen;
}
return 0;
}
/**
* @brief Set Symmetric Encryption and Decryption initialization vector
*
* @param ctx Symmetric crypto context
* @param iv The crypto initialization vector
* @param len The crypto initialization vector length
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_symmetric_setiv(struct rt_hwcrypto_ctx *ctx, const rt_uint8_t *iv, rt_size_t len)
{
struct hwcrypto_symmetric *symmetric_ctx;
if (ctx && len <= RT_HWCRYPTO_IV_MAX_SIZE)
{
symmetric_ctx = (struct hwcrypto_symmetric *)ctx;
rt_memcpy(symmetric_ctx->iv, iv, len);
symmetric_ctx->iv_len = len;
/* IV change flag set up */
symmetric_ctx->flags |= SYMMTRIC_MODIFY_IV;
return RT_EOK;
}
return -RT_EINVAL;
}
/**
* @brief Get Symmetric Encryption and Decryption initialization vector
*
* @param ctx Symmetric crypto context
* @param iv The crypto initialization vector buffer
* @param len The crypto initialization vector buffer length
*
* @return IV length of copy
*/
int rt_hwcrypto_symmetric_getiv(struct rt_hwcrypto_ctx *ctx, rt_uint8_t *iv, rt_size_t len)
{
struct hwcrypto_symmetric *symmetric_ctx = (struct hwcrypto_symmetric *)ctx;;
if (ctx && len >= symmetric_ctx->iv_len)
{
rt_memcpy(iv, symmetric_ctx->iv, symmetric_ctx->iv_len);
return symmetric_ctx->iv_len;
}
return 0;
}
/**
* @brief Set offset in initialization vector
*
* @param ctx Symmetric crypto context
* @param iv_off The offset in IV
*/
void rt_hwcrypto_symmetric_set_ivoff(struct rt_hwcrypto_ctx *ctx, rt_int32_t iv_off)
{
if (ctx)
{
((struct hwcrypto_symmetric *)ctx)->iv_off = iv_off;
/* iv_off change flag set up */
((struct hwcrypto_symmetric *)ctx)->flags |= SYMMTRIC_MODIFY_IVOFF;
}
}
/**
* @brief Get offset in initialization vector
*
* @param ctx Symmetric crypto context
* @param iv_off It must point to a valid memory
*/
void rt_hwcrypto_symmetric_get_ivoff(struct rt_hwcrypto_ctx *ctx, rt_int32_t *iv_off)
{
if (ctx && iv_off)
{
*iv_off = ((struct hwcrypto_symmetric *)ctx)->iv_off;
}
}
/**
* @brief This function copy symmetric crypto context
*
* @param des The destination symmetric crypto context
* @param src The symmetric crypto context to be copy
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_symmetric_cpy(struct rt_hwcrypto_ctx *des, const struct rt_hwcrypto_ctx *src)
{
struct hwcrypto_symmetric *symmetric_des = (struct hwcrypto_symmetric *)des;
struct hwcrypto_symmetric *symmetric_src = (struct hwcrypto_symmetric *)src;
if (des != RT_NULL && src != RT_NULL)
{
/* Copy Symmetric Encryption and Decryption Context Information */
symmetric_des->flags = symmetric_src->flags ;
symmetric_des->iv_len = symmetric_src->iv_len ;
symmetric_des->iv_off = symmetric_src->iv_off ;
symmetric_des->key_bitlen = symmetric_src->key_bitlen;
rt_memcpy(symmetric_des->iv, symmetric_src->iv, symmetric_src->iv_len);
rt_memcpy(symmetric_des->key, symmetric_src->key, symmetric_src->key_bitlen >> 3);
/* Hardware context copy */
return rt_hwcrypto_ctx_cpy(des, src);
}
return -RT_EINVAL;
}
/**
* @brief Reset symmetric crypto context
*
* @param ctx Symmetric crypto context
*/
void rt_hwcrypto_symmetric_reset(struct rt_hwcrypto_ctx *ctx)
{
struct hwcrypto_symmetric *symmetric_ctx = (struct hwcrypto_symmetric *)ctx;
if (ctx != RT_NULL)
{
/* Copy Symmetric Encryption and Decryption Context Information */
symmetric_ctx->flags = 0x00;
symmetric_ctx->iv_len = 0x00;
symmetric_ctx->iv_off = 0x00;
symmetric_ctx->key_bitlen = 0x00;
rt_memset(symmetric_ctx->iv, 0, RT_HWCRYPTO_IV_MAX_SIZE);
rt_memset(symmetric_ctx->key, 0, RT_HWCRYPTO_KEYBIT_MAX_SIZE >> 3);
/* Hardware context reset */
rt_hwcrypto_ctx_reset(ctx);
}
}
/**
* @brief Setting symmetric crypto context type
*
* @param ctx Symmetric crypto context
* @param type Types of settings
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_symmetric_set_type(struct rt_hwcrypto_ctx *ctx, hwcrypto_type type)
{
return rt_hwcrypto_set_type(ctx, type);
}
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