331 lines
8.8 KiB
C
331 lines
8.8 KiB
C
/*
|
|
* Key-agreement Protocol Primitives (KPP)
|
|
*
|
|
* Copyright (c) 2016, Intel Corporation
|
|
* Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
*/
|
|
|
|
#ifndef _CRYPTO_KPP_
|
|
#define _CRYPTO_KPP_
|
|
#include <linux/crypto.h>
|
|
|
|
/**
|
|
* struct kpp_request
|
|
*
|
|
* @base: Common attributes for async crypto requests
|
|
* @src: Source data
|
|
* @dst: Destination data
|
|
* @src_len: Size of the input buffer
|
|
* @dst_len: Size of the output buffer. It needs to be at least
|
|
* as big as the expected result depending on the operation
|
|
* After operation it will be updated with the actual size of the
|
|
* result. In case of error where the dst sgl size was insufficient,
|
|
* it will be updated to the size required for the operation.
|
|
* @__ctx: Start of private context data
|
|
*/
|
|
struct kpp_request {
|
|
struct crypto_async_request base;
|
|
struct scatterlist *src;
|
|
struct scatterlist *dst;
|
|
unsigned int src_len;
|
|
unsigned int dst_len;
|
|
void *__ctx[] CRYPTO_MINALIGN_ATTR;
|
|
};
|
|
|
|
/**
|
|
* struct crypto_kpp - user-instantiated object which encapsulate
|
|
* algorithms and core processing logic
|
|
*
|
|
* @base: Common crypto API algorithm data structure
|
|
*/
|
|
struct crypto_kpp {
|
|
struct crypto_tfm base;
|
|
};
|
|
|
|
/**
|
|
* struct kpp_alg - generic key-agreement protocol primitives
|
|
*
|
|
* @set_secret: Function invokes the protocol specific function to
|
|
* store the secret private key along with parameters.
|
|
* The implementation knows how to decode thie buffer
|
|
* @generate_public_key: Function generate the public key to be sent to the
|
|
* counterpart. In case of error, where output is not big
|
|
* enough req->dst_len will be updated to the size
|
|
* required
|
|
* @compute_shared_secret: Function compute the shared secret as defined by
|
|
* the algorithm. The result is given back to the user.
|
|
* In case of error, where output is not big enough,
|
|
* req->dst_len will be updated to the size required
|
|
* @max_size: Function returns the size of the output buffer
|
|
* @init: Initialize the object. This is called only once at
|
|
* instantiation time. In case the cryptographic hardware
|
|
* needs to be initialized. Software fallback should be
|
|
* put in place here.
|
|
* @exit: Undo everything @init did.
|
|
*
|
|
* @reqsize: Request context size required by algorithm
|
|
* implementation
|
|
* @base Common crypto API algorithm data structure
|
|
*/
|
|
struct kpp_alg {
|
|
int (*set_secret)(struct crypto_kpp *tfm, void *buffer,
|
|
unsigned int len);
|
|
int (*generate_public_key)(struct kpp_request *req);
|
|
int (*compute_shared_secret)(struct kpp_request *req);
|
|
|
|
int (*max_size)(struct crypto_kpp *tfm);
|
|
|
|
int (*init)(struct crypto_kpp *tfm);
|
|
void (*exit)(struct crypto_kpp *tfm);
|
|
|
|
unsigned int reqsize;
|
|
struct crypto_alg base;
|
|
};
|
|
|
|
/**
|
|
* DOC: Generic Key-agreement Protocol Primitevs API
|
|
*
|
|
* The KPP API is used with the algorithm type
|
|
* CRYPTO_ALG_TYPE_KPP (listed as type "kpp" in /proc/crypto)
|
|
*/
|
|
|
|
/**
|
|
* crypto_alloc_kpp() - allocate KPP tfm handle
|
|
* @alg_name: is the name of the kpp algorithm (e.g. "dh", "ecdh")
|
|
* @type: specifies the type of the algorithm
|
|
* @mask: specifies the mask for the algorithm
|
|
*
|
|
* Allocate a handle for kpp algorithm. The returned struct crypto_kpp
|
|
* is requeried for any following API invocation
|
|
*
|
|
* Return: allocated handle in case of success; IS_ERR() is true in case of
|
|
* an error, PTR_ERR() returns the error code.
|
|
*/
|
|
struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask);
|
|
|
|
static inline struct crypto_tfm *crypto_kpp_tfm(struct crypto_kpp *tfm)
|
|
{
|
|
return &tfm->base;
|
|
}
|
|
|
|
static inline struct kpp_alg *__crypto_kpp_alg(struct crypto_alg *alg)
|
|
{
|
|
return container_of(alg, struct kpp_alg, base);
|
|
}
|
|
|
|
static inline struct crypto_kpp *__crypto_kpp_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
return container_of(tfm, struct crypto_kpp, base);
|
|
}
|
|
|
|
static inline struct kpp_alg *crypto_kpp_alg(struct crypto_kpp *tfm)
|
|
{
|
|
return __crypto_kpp_alg(crypto_kpp_tfm(tfm)->__crt_alg);
|
|
}
|
|
|
|
static inline unsigned int crypto_kpp_reqsize(struct crypto_kpp *tfm)
|
|
{
|
|
return crypto_kpp_alg(tfm)->reqsize;
|
|
}
|
|
|
|
static inline void kpp_request_set_tfm(struct kpp_request *req,
|
|
struct crypto_kpp *tfm)
|
|
{
|
|
req->base.tfm = crypto_kpp_tfm(tfm);
|
|
}
|
|
|
|
static inline struct crypto_kpp *crypto_kpp_reqtfm(struct kpp_request *req)
|
|
{
|
|
return __crypto_kpp_tfm(req->base.tfm);
|
|
}
|
|
|
|
/**
|
|
* crypto_free_kpp() - free KPP tfm handle
|
|
*
|
|
* @tfm: KPP tfm handle allocated with crypto_alloc_kpp()
|
|
*/
|
|
static inline void crypto_free_kpp(struct crypto_kpp *tfm)
|
|
{
|
|
crypto_destroy_tfm(tfm, crypto_kpp_tfm(tfm));
|
|
}
|
|
|
|
/**
|
|
* kpp_request_alloc() - allocates kpp request
|
|
*
|
|
* @tfm: KPP tfm handle allocated with crypto_alloc_kpp()
|
|
* @gfp: allocation flags
|
|
*
|
|
* Return: allocated handle in case of success or NULL in case of an error.
|
|
*/
|
|
static inline struct kpp_request *kpp_request_alloc(struct crypto_kpp *tfm,
|
|
gfp_t gfp)
|
|
{
|
|
struct kpp_request *req;
|
|
|
|
req = kmalloc(sizeof(*req) + crypto_kpp_reqsize(tfm), gfp);
|
|
if (likely(req))
|
|
kpp_request_set_tfm(req, tfm);
|
|
|
|
return req;
|
|
}
|
|
|
|
/**
|
|
* kpp_request_free() - zeroize and free kpp request
|
|
*
|
|
* @req: request to free
|
|
*/
|
|
static inline void kpp_request_free(struct kpp_request *req)
|
|
{
|
|
kzfree(req);
|
|
}
|
|
|
|
/**
|
|
* kpp_request_set_callback() - Sets an asynchronous callback.
|
|
*
|
|
* Callback will be called when an asynchronous operation on a given
|
|
* request is finished.
|
|
*
|
|
* @req: request that the callback will be set for
|
|
* @flgs: specify for instance if the operation may backlog
|
|
* @cmpl: callback which will be called
|
|
* @data: private data used by the caller
|
|
*/
|
|
static inline void kpp_request_set_callback(struct kpp_request *req,
|
|
u32 flgs,
|
|
crypto_completion_t cmpl,
|
|
void *data)
|
|
{
|
|
req->base.complete = cmpl;
|
|
req->base.data = data;
|
|
req->base.flags = flgs;
|
|
}
|
|
|
|
/**
|
|
* kpp_request_set_input() - Sets input buffer
|
|
*
|
|
* Sets parameters required by generate_public_key
|
|
*
|
|
* @req: kpp request
|
|
* @input: ptr to input scatter list
|
|
* @input_len: size of the input scatter list
|
|
*/
|
|
static inline void kpp_request_set_input(struct kpp_request *req,
|
|
struct scatterlist *input,
|
|
unsigned int input_len)
|
|
{
|
|
req->src = input;
|
|
req->src_len = input_len;
|
|
}
|
|
|
|
/**
|
|
* kpp_request_set_output() - Sets output buffer
|
|
*
|
|
* Sets parameters required by kpp operation
|
|
*
|
|
* @req: kpp request
|
|
* @output: ptr to output scatter list
|
|
* @output_len: size of the output scatter list
|
|
*/
|
|
static inline void kpp_request_set_output(struct kpp_request *req,
|
|
struct scatterlist *output,
|
|
unsigned int output_len)
|
|
{
|
|
req->dst = output;
|
|
req->dst_len = output_len;
|
|
}
|
|
|
|
enum {
|
|
CRYPTO_KPP_SECRET_TYPE_UNKNOWN,
|
|
CRYPTO_KPP_SECRET_TYPE_DH,
|
|
CRYPTO_KPP_SECRET_TYPE_ECDH,
|
|
};
|
|
|
|
/**
|
|
* struct kpp_secret - small header for packing secret buffer
|
|
*
|
|
* @type: define type of secret. Each kpp type will define its own
|
|
* @len: specify the len of the secret, include the header, that
|
|
* follows the struct
|
|
*/
|
|
struct kpp_secret {
|
|
unsigned short type;
|
|
unsigned short len;
|
|
};
|
|
|
|
/**
|
|
* crypto_kpp_set_secret() - Invoke kpp operation
|
|
*
|
|
* Function invokes the specific kpp operation for a given alg.
|
|
*
|
|
* @tfm: tfm handle
|
|
*
|
|
* Return: zero on success; error code in case of error
|
|
*/
|
|
static inline int crypto_kpp_set_secret(struct crypto_kpp *tfm, void *buffer,
|
|
unsigned int len)
|
|
{
|
|
struct kpp_alg *alg = crypto_kpp_alg(tfm);
|
|
|
|
return alg->set_secret(tfm, buffer, len);
|
|
}
|
|
|
|
/**
|
|
* crypto_kpp_generate_public_key() - Invoke kpp operation
|
|
*
|
|
* Function invokes the specific kpp operation for generating the public part
|
|
* for a given kpp algorithm
|
|
*
|
|
* @req: kpp key request
|
|
*
|
|
* Return: zero on success; error code in case of error
|
|
*/
|
|
static inline int crypto_kpp_generate_public_key(struct kpp_request *req)
|
|
{
|
|
struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
|
|
struct kpp_alg *alg = crypto_kpp_alg(tfm);
|
|
|
|
return alg->generate_public_key(req);
|
|
}
|
|
|
|
/**
|
|
* crypto_kpp_compute_shared_secret() - Invoke kpp operation
|
|
*
|
|
* Function invokes the specific kpp operation for computing the shared secret
|
|
* for a given kpp algorithm.
|
|
*
|
|
* @req: kpp key request
|
|
*
|
|
* Return: zero on success; error code in case of error
|
|
*/
|
|
static inline int crypto_kpp_compute_shared_secret(struct kpp_request *req)
|
|
{
|
|
struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
|
|
struct kpp_alg *alg = crypto_kpp_alg(tfm);
|
|
|
|
return alg->compute_shared_secret(req);
|
|
}
|
|
|
|
/**
|
|
* crypto_kpp_maxsize() - Get len for output buffer
|
|
*
|
|
* Function returns the output buffer size required
|
|
*
|
|
* @tfm: KPP tfm handle allocated with crypto_alloc_kpp()
|
|
*
|
|
* Return: minimum len for output buffer or error code if key hasn't been set
|
|
*/
|
|
static inline int crypto_kpp_maxsize(struct crypto_kpp *tfm)
|
|
{
|
|
struct kpp_alg *alg = crypto_kpp_alg(tfm);
|
|
|
|
return alg->max_size(tfm);
|
|
}
|
|
|
|
#endif
|