include/crypto: Crypto abstraction header
Adds crypto API interface for interaction between applications and crypto drivers. Encryption/Decryption APIs are defined here. Jira: ZEP-328 Change-Id: I1a534ae2a69c7e1c416fa78a2822c37040b225f6 Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
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Jithu Joseph
Anas Nashif
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281
include/crypto/cipher.h
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281
include/crypto/cipher.h
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/*
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* Copyright (c) 2016 Intel Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file
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* @brief Crypto Cipher APIs
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*
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* This file contains the Crypto Abstraction layer APIs.
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*
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* [Experimental] Users should note that the APIs can change
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* as a part of ongoing development.
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*/
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#ifndef __CRYPTO_CIPHER_H__
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#define __CRYPTO_CIPHER_H__
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#include <device.h>
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#include <errno.h>
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#include <misc/util.h>
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#include <misc/__assert.h>
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#include "cipher_structs.h"
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/* The API a crypto driver should implement */
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struct crypto_driver_api {
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int (*query_hw_caps)(struct device *dev);
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/* Setup a crypto session */
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int (*begin_session)(struct device *dev, struct cipher_ctx *ctx,
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enum cipher_algo algo, enum cipher_mode mode,
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enum cipher_op op_type);
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/* Tear down an established session */
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int (*free_session)(struct device *dev, struct cipher_ctx *ctx);
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/* Register async crypto op completion callback with the driver*/
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int (*crypto_async_callback_set)(struct device *dev,
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crypto_completion_cb cb);
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};
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/* Following are the calls an app could make to get cipher stuff done.
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* The first two relates to crypto "session" setup / tear down.
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* Further we have four mode specific (CTR, CCM, CBC ...) calls to perform the
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* actual crypto operation in the context of a session. Also we have an
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* API to provide the callback for async operations.
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*/
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/*
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* @brief Query the crypto hardware capabilities
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*
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* This API is used by the app to query the capabilities supported by the
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* crypto device. Based on this the app can specify a subset of the supported
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* options to be honored for a session during cipher_begin_session()
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*
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* @param[in] dev Pointer to the device structure for the driver instance.
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*
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* @return bitmask of supported options.
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*/
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static inline int cipher_query_hwcaps(struct device *dev)
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{
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struct crypto_driver_api *api;
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int tmp;
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api = (struct crypto_driver_api *) dev->driver_api;
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tmp = api->query_hw_caps(dev);
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__ASSERT((tmp & (CAP_OPAQUE_KEY_HNDL | CAP_RAW_KEY)) != 0,
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"Driver should support atleast one key type: RAW/Opaque");
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__ASSERT((tmp & (CAP_INPLACE_OPS | CAP_SEPARATE_IO_BUFS)) != 0,
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"Driver should support atleast one IO buf type: Inplace/separate");
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__ASSERT((tmp & (CAP_SYNC_OPS | CAP_ASYNC_OPS)) != 0,
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"Driver should support atleast one op-type: sync/async");
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return tmp;
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}
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/*
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* @brief Setup a crypto session
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*
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* Initializes one time parameters, like the session key, algorithm and cipher
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* mode which may remain constant for all operations in the session. The state
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* may be cached in hardware and/or driver data state variables.
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*
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* @param[in] dev Pointer to the device structure for the driver instance.
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* @param[in] ctx Pointer to the context structure. Various one time
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* parameters like key, keylength etc are supplied via
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* this field. Take a look at the ctx structure definition
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* to know which fields are to be populated by the app
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* before making this call.
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* @param[in] algo The crypto algorithm to be used in this session. e.g AES
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* @param[in] mode The cipher mode to be used in this session. e.g CBC, CTR
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* @param[in] optype Whether we should encrypt or decrypt in this session
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* @return 0 on success, negative errno code on fail.
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*/
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static inline int cipher_begin_session(struct device *dev,
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struct cipher_ctx *ctx,
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enum cipher_algo algo,
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enum cipher_mode mode,
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enum cipher_op optype)
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{
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struct crypto_driver_api *api;
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uint32_t flags;
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api = (struct crypto_driver_api *) dev->driver_api;
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ctx->device = dev;
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ctx->ops.cipher_mode = mode;
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flags = (ctx->flags & (CAP_OPAQUE_KEY_HNDL | CAP_RAW_KEY));
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__ASSERT(flags != 0, "Keytype missing: RAW Key or OPAQUE handle");
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__ASSERT(flags != (CAP_OPAQUE_KEY_HNDL | CAP_RAW_KEY),
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"conflicting options for keytype");
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flags = (ctx->flags & (CAP_INPLACE_OPS | CAP_SEPARATE_IO_BUFS));
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__ASSERT(flags != 0, "IO buffer type missing");
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__ASSERT(flags != (CAP_INPLACE_OPS | CAP_SEPARATE_IO_BUFS),
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"conflicting options for IO buffer type");
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flags = (ctx->flags & (CAP_SYNC_OPS | CAP_ASYNC_OPS));
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__ASSERT(flags != 0, "sync/async type missing");
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__ASSERT(flags != (CAP_SYNC_OPS | CAP_ASYNC_OPS),
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"conflicting options for sync/async");
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return api->begin_session(dev, ctx, algo, mode, optype);
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}
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/*
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* @brief Cleanup a crypto session
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*
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* Clears the hardware and/or driver state of a previous session.
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*
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* @param[in] dev Pointer to the device structure for the driver instance.
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* @param[in] ctx Pointer to the crypto context structure, of the session
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* to be freed.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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static inline int cipher_free_session(struct device *dev,
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struct cipher_ctx *ctx)
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{
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struct crypto_driver_api *api;
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api = (struct crypto_driver_api *) dev->driver_api;
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return api->free_session(dev, ctx);
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}
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/*
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* @brief Registers an async crypto op completion callback with the driver
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*
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* The application can register an async crypto op completion callback handler
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* to be invoked by the driver, on completion of a prior request submitted via
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* crypto_do_op(). Based on crypto device hardware semantics, this is likely to
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* be invoked from an ISR context.
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*
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* @param[in] dev Pointer to the device structure for the driver instance.
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* @param[in] cb Pointer to application callback to be called by the driver.
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*
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* @return 0 on success, -ENOTSUP if the driver does not support async op,
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* negative errno code on fail.
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*/
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static inline int cipher_callback_set(struct device *dev,
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crypto_completion_cb cb)
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{
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struct crypto_driver_api *api;
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api = (struct crypto_driver_api *) dev->driver_api;
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if (api->crypto_async_callback_set) {
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return api->crypto_async_callback_set(dev, cb);
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}
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return -ENOTSUP;
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}
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/*
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* @brief Perform Single block crypto op. This should not be overloaded to
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* operate on multiple blocks for security reasons.
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*
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* @param[in] ctx Pointer to the crypto context of this op.
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* @param[in/out] pkt Structure holding the Input/Output buffer pointers.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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static inline int cipher_block_op(struct cipher_ctx *ctx,
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struct cipher_pkt *pkt)
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{
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__ASSERT(ctx->ops.cipher_mode == CRYPTO_CIPHER_MODE_ECB, "ECB mode "
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"session invoking a different mode handler");
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pkt->ctx = ctx;
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return ctx->ops.block_crypt_hndlr(ctx, pkt);
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}
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/*
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* @brief Perform Cipher Block Chaining (CBC) crypto operation.
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*
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* @param[in] ctx Pointer to the crypto context of this op.
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* @param[in/out] pkt Structure holding the Input/Output buffer pointers.
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* @param[in] iv Initialization Vector for the operation. Same
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* iv value should not be reused across multiple
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* operations (within a session context) for security.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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static inline int cipher_cbc_op(struct cipher_ctx *ctx,
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struct cipher_pkt *pkt, uint8_t *iv)
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{
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__ASSERT(ctx->ops.cipher_mode == CRYPTO_CIPHER_MODE_CBC, "CBC mode "
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"session invoking a different mode handler");
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pkt->ctx = ctx;
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return ctx->ops.cbc_crypt_hndlr(ctx, pkt, iv);
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}
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/*
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* @brief Perform Counter (CTR) mode crypto operation.
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*
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* @param[in] ctx Pointer to the crypto context of this op.
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* @param[in/out] pkt Structure holding the Input/Output buffer pointers.
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* @param[in] iv Initialization Vector for the operation. We use a
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* split counter formed by appending iv and ctr.
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* Consequently ivlen = keylen - ctrlen. 'ctrlen' is
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* specified during session setup through the
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* 'ctx.mode_params.ctr_params.ctr_len' parameter. IV
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* should not be reused across multiple operations
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* (within a session context) for security. The non-iv
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* part of the split counter is transparent to the caller
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* and is fully managed by the crypto provider.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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static inline int cipher_ctr_op(struct cipher_ctx *ctx,
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struct cipher_pkt *pkt, uint8_t *iv)
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{
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__ASSERT(ctx->ops.cipher_mode == CRYPTO_CIPHER_MODE_CTR, "CTR mode "
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"session invoking a different mode handler");
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pkt->ctx = ctx;
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return ctx->ops.ctr_crypt_hndlr(ctx, pkt, iv);
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}
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/*
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* @brief Perform Counter with CBC-MAC (CCM) mode crypto operation
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*
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* @param[in] ctx Pointer to the crypto context of this op.
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* @param[in/out] pkt Structure holding the Input/Output, Assosciated Data
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* and tag buffer pointers.
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* @param[in] nonce Nonce for the operation. Same Nonce value should not
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* be reused across multiple operations (within a
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* session context) for security.
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*
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* @return 0 on success, negative errno code on fail.
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*/
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static inline int cipher_ccm_op(struct cipher_ctx *ctx,
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struct cipher_aead_pkt *pkt, uint8_t *nonce)
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{
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__ASSERT(ctx->ops.cipher_mode == CRYPTO_CIPHER_MODE_CCM, "CCM mode "
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"session invoking a different mode handler");
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pkt->pkt->ctx = ctx;
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return ctx->ops.ccm_crypt_hndlr(ctx, pkt, nonce);
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}
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#endif /* __CRYPTO_CIPHER_H__ */
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