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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright 2018-2020 NXP
*
* Crypto Cipher interface implementation to enable HW driver.
*/
#include <assert.h>
#include <crypto/crypto.h>
#include <crypto/crypto_impl.h>
#include <drvcrypt.h>
#include <drvcrypt_cipher.h>
#include <malloc.h>
#include <util.h>
static const struct crypto_cipher_ops cipher_ops;
/*
* Returns the reference to the driver context
*
* @ctx Reference the API context pointer
*/
static struct crypto_cipher *to_cipher_ctx(struct crypto_cipher_ctx *ctx)
{
assert(ctx && ctx->ops == &cipher_ops);
return container_of(ctx, struct crypto_cipher, cipher_ctx);
}
/*
* Free cipher context
*
* @ctx Reference the API context pointer
*/
static void cipher_free_ctx(struct crypto_cipher_ctx *ctx)
{
struct crypto_cipher *cipher = to_cipher_ctx(ctx);
if (cipher->op && cipher->op->free_ctx)
cipher->op->free_ctx(cipher->ctx);
free(cipher);
}
/*
* Copy cipher context
*
* @dst_ctx [out] Reference the API context pointer destination
* @src_ctx Reference the API context pointer source
*/
static void cipher_copy_state(struct crypto_cipher_ctx *dst_ctx,
struct crypto_cipher_ctx *src_ctx)
{
struct crypto_cipher *cipher_src = to_cipher_ctx(src_ctx);
struct crypto_cipher *cipher_dst = to_cipher_ctx(dst_ctx);
if (cipher_src->op && cipher_src->op->copy_state)
cipher_src->op->copy_state(cipher_dst->ctx, cipher_src->ctx);
}
/*
* Initialization of the cipher operation
*
* @ctx Reference the API context pointer
* @mode Operation mode
* @key1 First Key
* @key1_len Length of the first key
* @key2 Second Key
* @key2_len Length of the second key
* @iv Initial Vector
* @iv_len Length of the IV
*/
static TEE_Result cipher_init(struct crypto_cipher_ctx *ctx,
TEE_OperationMode mode, const uint8_t *key1,
size_t key1_len, const uint8_t *key2,
size_t key2_len, const uint8_t *iv, size_t iv_len)
{
TEE_Result ret = TEE_ERROR_NOT_IMPLEMENTED;
struct crypto_cipher *cipher = to_cipher_ctx(ctx);
if ((!key1 && key1_len) || (!key2 && key2_len) || (!iv && iv_len)) {
CRYPTO_TRACE("One of the key is not correct");
CRYPTO_TRACE("key1 @%p-%zu bytes", key1, key1_len);
CRYPTO_TRACE("key2 @%p-%zu bytes", key1, key1_len);
CRYPTO_TRACE("iv @%p-%zu bytes", iv, iv_len);
return TEE_ERROR_BAD_PARAMETERS;
}
if (cipher->op && cipher->op->init) {
struct drvcrypt_cipher_init dinit = {
.ctx = cipher->ctx,
.encrypt = (mode == TEE_MODE_ENCRYPT),
.key1.data = (uint8_t *)key1,
.key1.length = key1_len,
.key2.data = (uint8_t *)key2,
.key2.length = key2_len,
.iv.data = (uint8_t *)iv,
.iv.length = iv_len,
};
ret = cipher->op->init(&dinit);
}
CRYPTO_TRACE("cipher ret 0x%" PRIX32, ret);
return ret;
}
/*
* Update of the cipher operation
*
* @ctx Reference the API context pointer
* @last_block True if last block to handle
* @data Data to encrypt/decrypt
* @len Length of the input data and output result
* @dst [out] Output data of the operation
*/
static TEE_Result cipher_update(struct crypto_cipher_ctx *ctx, bool last_block,
const uint8_t *data, size_t len, uint8_t *dst)
{
TEE_Result ret = TEE_ERROR_NOT_IMPLEMENTED;
struct crypto_cipher *cipher = to_cipher_ctx(ctx);
if (!dst) {
CRYPTO_TRACE("Destination buffer error");
return TEE_ERROR_BAD_PARAMETERS;
}
if (!data && len) {
CRYPTO_TRACE("Bad data data @%p-%zu bytes", data, len);
return TEE_ERROR_BAD_PARAMETERS;
}
if (cipher->op && cipher->op->update) {
struct drvcrypt_cipher_update dupdate = {
.ctx = cipher->ctx,
.last = last_block,
.src.data = (uint8_t *)data,
.src.length = len,
.dst.data = dst,
.dst.length = len,
};
ret = cipher->op->update(&dupdate);
}
CRYPTO_TRACE("cipher ret 0x%" PRIX32, ret);
return ret;
}
/*
* Finalize the cipher operation
*
* @ctx Reference the API context pointer
*/
static void cipher_final(struct crypto_cipher_ctx *ctx)
{
struct crypto_cipher *cipher = to_cipher_ctx(ctx);
if (cipher->op && cipher->op->final)
cipher->op->final(cipher->ctx);
}
static const struct crypto_cipher_ops cipher_ops = {
.init = cipher_init,
.update = cipher_update,
.final = cipher_final,
.free_ctx = cipher_free_ctx,
.copy_state = cipher_copy_state,
};
TEE_Result drvcrypt_cipher_alloc_ctx(struct crypto_cipher_ctx **ctx,
uint32_t algo)
{
TEE_Result ret = TEE_ERROR_NOT_IMPLEMENTED;
struct crypto_cipher *cipher = NULL;
CRYPTO_TRACE("Cipher alloc_ctx algo 0x%" PRIX32, algo);
assert(ctx);
cipher = calloc(1, sizeof(*cipher));
if (!cipher)
return TEE_ERROR_OUT_OF_MEMORY;
cipher->op = drvcrypt_get_ops(CRYPTO_CIPHER);
if (cipher->op && cipher->op->alloc_ctx)
ret = cipher->op->alloc_ctx(&cipher->ctx, algo);
if (ret != TEE_SUCCESS) {
free(cipher);
} else {
cipher->cipher_ctx.ops = &cipher_ops;
*ctx = &cipher->cipher_ctx;
}
CRYPTO_TRACE("Cipher alloc_ctx ret 0x%" PRIX32, ret);
return ret;
}
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