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561f8e2df9
As of now, crypto_akcipher_maxsize() can not be reached without successfully setting the key for the transformation. akcipher algorithm implementations check if the key was set and then return the output buffer size required for the given key. Change the return type to unsigned int and always assume that this function is called after a successful setkey of the transformation. akcipher algorithm implementations will remove the check if key is not NULL and directly return the max size. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
388 lines
12 KiB
C
388 lines
12 KiB
C
/*
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* Public Key Encryption
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*
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* Copyright (c) 2015, Intel Corporation
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* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#ifndef _CRYPTO_AKCIPHER_H
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#define _CRYPTO_AKCIPHER_H
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#include <linux/crypto.h>
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/**
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* struct akcipher_request - public key request
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*
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* @base: Common attributes for async crypto requests
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* @src: Source data
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* @dst: Destination data
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* @src_len: Size of the input buffer
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* @dst_len: Size of the output buffer. It needs to be at least
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* as big as the expected result depending on the operation
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* After operation it will be updated with the actual size of the
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* result.
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* In case of error where the dst sgl size was insufficient,
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* it will be updated to the size required for the operation.
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* @__ctx: Start of private context data
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*/
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struct akcipher_request {
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struct crypto_async_request base;
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struct scatterlist *src;
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struct scatterlist *dst;
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unsigned int src_len;
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unsigned int dst_len;
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void *__ctx[] CRYPTO_MINALIGN_ATTR;
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};
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/**
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* struct crypto_akcipher - user-instantiated objects which encapsulate
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* algorithms and core processing logic
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*
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* @base: Common crypto API algorithm data structure
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*/
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struct crypto_akcipher {
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struct crypto_tfm base;
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};
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/**
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* struct akcipher_alg - generic public key algorithm
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*
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* @sign: Function performs a sign operation as defined by public key
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* algorithm. In case of error, where the dst_len was insufficient,
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* the req->dst_len will be updated to the size required for the
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* operation
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* @verify: Function performs a sign operation as defined by public key
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* algorithm. In case of error, where the dst_len was insufficient,
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* the req->dst_len will be updated to the size required for the
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* operation
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* @encrypt: Function performs an encrypt operation as defined by public key
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* algorithm. In case of error, where the dst_len was insufficient,
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* the req->dst_len will be updated to the size required for the
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* operation
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* @decrypt: Function performs a decrypt operation as defined by public key
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* algorithm. In case of error, where the dst_len was insufficient,
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* the req->dst_len will be updated to the size required for the
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* operation
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* @set_pub_key: Function invokes the algorithm specific set public key
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* function, which knows how to decode and interpret
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* the BER encoded public key
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* @set_priv_key: Function invokes the algorithm specific set private key
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* function, which knows how to decode and interpret
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* the BER encoded private key
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* @max_size: Function returns dest buffer size required for a given key.
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* @init: Initialize the cryptographic transformation object.
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* This function is used to initialize the cryptographic
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* transformation object. This function is called only once at
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* the instantiation time, right after the transformation context
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* was allocated. In case the cryptographic hardware has some
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* special requirements which need to be handled by software, this
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* function shall check for the precise requirement of the
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* transformation and put any software fallbacks in place.
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* @exit: Deinitialize the cryptographic transformation object. This is a
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* counterpart to @init, used to remove various changes set in
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* @init.
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*
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* @reqsize: Request context size required by algorithm implementation
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* @base: Common crypto API algorithm data structure
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*/
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struct akcipher_alg {
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int (*sign)(struct akcipher_request *req);
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int (*verify)(struct akcipher_request *req);
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int (*encrypt)(struct akcipher_request *req);
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int (*decrypt)(struct akcipher_request *req);
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int (*set_pub_key)(struct crypto_akcipher *tfm, const void *key,
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unsigned int keylen);
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int (*set_priv_key)(struct crypto_akcipher *tfm, const void *key,
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unsigned int keylen);
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unsigned int (*max_size)(struct crypto_akcipher *tfm);
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int (*init)(struct crypto_akcipher *tfm);
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void (*exit)(struct crypto_akcipher *tfm);
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unsigned int reqsize;
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struct crypto_alg base;
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};
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/**
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* DOC: Generic Public Key API
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*
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* The Public Key API is used with the algorithms of type
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* CRYPTO_ALG_TYPE_AKCIPHER (listed as type "akcipher" in /proc/crypto)
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*/
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/**
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* crypto_alloc_akcipher() - allocate AKCIPHER tfm handle
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* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
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* public key algorithm e.g. "rsa"
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* @type: specifies the type of the algorithm
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* @mask: specifies the mask for the algorithm
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*
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* Allocate a handle for public key algorithm. The returned struct
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* crypto_akcipher is the handle that is required for any subsequent
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* API invocation for the public key operations.
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*
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* Return: allocated handle in case of success; IS_ERR() is true in case
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* of an error, PTR_ERR() returns the error code.
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*/
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struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
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u32 mask);
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static inline struct crypto_tfm *crypto_akcipher_tfm(
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struct crypto_akcipher *tfm)
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{
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return &tfm->base;
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}
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static inline struct akcipher_alg *__crypto_akcipher_alg(struct crypto_alg *alg)
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{
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return container_of(alg, struct akcipher_alg, base);
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}
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static inline struct crypto_akcipher *__crypto_akcipher_tfm(
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struct crypto_tfm *tfm)
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{
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return container_of(tfm, struct crypto_akcipher, base);
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}
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static inline struct akcipher_alg *crypto_akcipher_alg(
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struct crypto_akcipher *tfm)
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{
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return __crypto_akcipher_alg(crypto_akcipher_tfm(tfm)->__crt_alg);
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}
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static inline unsigned int crypto_akcipher_reqsize(struct crypto_akcipher *tfm)
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{
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return crypto_akcipher_alg(tfm)->reqsize;
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}
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static inline void akcipher_request_set_tfm(struct akcipher_request *req,
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struct crypto_akcipher *tfm)
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{
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req->base.tfm = crypto_akcipher_tfm(tfm);
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}
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static inline struct crypto_akcipher *crypto_akcipher_reqtfm(
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struct akcipher_request *req)
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{
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return __crypto_akcipher_tfm(req->base.tfm);
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}
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/**
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* crypto_free_akcipher() - free AKCIPHER tfm handle
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*
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* @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
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*/
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static inline void crypto_free_akcipher(struct crypto_akcipher *tfm)
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{
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crypto_destroy_tfm(tfm, crypto_akcipher_tfm(tfm));
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}
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/**
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* akcipher_request_alloc() - allocates public key request
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*
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* @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
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* @gfp: allocation flags
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*
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* Return: allocated handle in case of success or NULL in case of an error.
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*/
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static inline struct akcipher_request *akcipher_request_alloc(
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struct crypto_akcipher *tfm, gfp_t gfp)
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{
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struct akcipher_request *req;
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req = kmalloc(sizeof(*req) + crypto_akcipher_reqsize(tfm), gfp);
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if (likely(req))
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akcipher_request_set_tfm(req, tfm);
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return req;
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}
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/**
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* akcipher_request_free() - zeroize and free public key request
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*
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* @req: request to free
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*/
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static inline void akcipher_request_free(struct akcipher_request *req)
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{
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kzfree(req);
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}
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/**
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* akcipher_request_set_callback() - Sets an asynchronous callback.
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*
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* Callback will be called when an asynchronous operation on a given
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* request is finished.
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*
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* @req: request that the callback will be set for
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* @flgs: specify for instance if the operation may backlog
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* @cmpl: callback which will be called
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* @data: private data used by the caller
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*/
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static inline void akcipher_request_set_callback(struct akcipher_request *req,
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u32 flgs,
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crypto_completion_t cmpl,
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void *data)
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{
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req->base.complete = cmpl;
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req->base.data = data;
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req->base.flags = flgs;
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}
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/**
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* akcipher_request_set_crypt() - Sets request parameters
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*
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* Sets parameters required by crypto operation
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*
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* @req: public key request
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* @src: ptr to input scatter list
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* @dst: ptr to output scatter list
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* @src_len: size of the src input scatter list to be processed
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* @dst_len: size of the dst output scatter list
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*/
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static inline void akcipher_request_set_crypt(struct akcipher_request *req,
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struct scatterlist *src,
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struct scatterlist *dst,
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unsigned int src_len,
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unsigned int dst_len)
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{
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req->src = src;
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req->dst = dst;
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req->src_len = src_len;
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req->dst_len = dst_len;
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}
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/**
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* crypto_akcipher_maxsize() - Get len for output buffer
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*
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* Function returns the dest buffer size required for a given key.
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* Function assumes that the key is already set in the transformation. If this
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* function is called without a setkey or with a failed setkey, you will end up
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* in a NULL dereference.
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*
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* @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
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*/
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static inline unsigned int crypto_akcipher_maxsize(struct crypto_akcipher *tfm)
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{
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struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
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return alg->max_size(tfm);
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}
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/**
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* crypto_akcipher_encrypt() - Invoke public key encrypt operation
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*
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* Function invokes the specific public key encrypt operation for a given
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* public key algorithm
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*
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* @req: asymmetric key request
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*
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* Return: zero on success; error code in case of error
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*/
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static inline int crypto_akcipher_encrypt(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
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return alg->encrypt(req);
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}
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/**
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* crypto_akcipher_decrypt() - Invoke public key decrypt operation
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*
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* Function invokes the specific public key decrypt operation for a given
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* public key algorithm
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*
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* @req: asymmetric key request
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*
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* Return: zero on success; error code in case of error
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*/
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static inline int crypto_akcipher_decrypt(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
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return alg->decrypt(req);
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}
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/**
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* crypto_akcipher_sign() - Invoke public key sign operation
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*
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* Function invokes the specific public key sign operation for a given
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* public key algorithm
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*
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* @req: asymmetric key request
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*
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* Return: zero on success; error code in case of error
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*/
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static inline int crypto_akcipher_sign(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
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return alg->sign(req);
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}
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/**
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* crypto_akcipher_verify() - Invoke public key verify operation
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*
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* Function invokes the specific public key verify operation for a given
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* public key algorithm
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*
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* @req: asymmetric key request
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*
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* Return: zero on success; error code in case of error
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*/
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static inline int crypto_akcipher_verify(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
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return alg->verify(req);
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}
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/**
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* crypto_akcipher_set_pub_key() - Invoke set public key operation
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*
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* Function invokes the algorithm specific set key function, which knows
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* how to decode and interpret the encoded key
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*
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* @tfm: tfm handle
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* @key: BER encoded public key
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* @keylen: length of the key
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*
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* Return: zero on success; error code in case of error
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*/
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static inline int crypto_akcipher_set_pub_key(struct crypto_akcipher *tfm,
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const void *key,
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unsigned int keylen)
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{
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struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
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return alg->set_pub_key(tfm, key, keylen);
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}
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/**
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* crypto_akcipher_set_priv_key() - Invoke set private key operation
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*
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* Function invokes the algorithm specific set key function, which knows
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* how to decode and interpret the encoded key
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*
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* @tfm: tfm handle
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* @key: BER encoded private key
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* @keylen: length of the key
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*
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* Return: zero on success; error code in case of error
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*/
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static inline int crypto_akcipher_set_priv_key(struct crypto_akcipher *tfm,
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const void *key,
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unsigned int keylen)
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{
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struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
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return alg->set_priv_key(tfm, key, keylen);
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}
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#endif
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