/* SPDX-License-Identifier: GPL-2.0-or-later *//* * Public Key Encryption * * Copyright (c) 2015, Intel Corporation * Authors: Tadeusz Struk <tadeusz.struk@intel.com> */#ifndef _CRYPTO_AKCIPHER_H#define _CRYPTO_AKCIPHER_H#include <linux/crypto.h> /** * struct akcipher_request - public key request * * @base:	Common attributes for async crypto requests * @src:	Source data *		For verify op this is signature + digest, in that case *		total size of @src is @src_len + @dst_len. * @dst:	Destination data (Should be NULL for verify op) * @src_len:	Size of the input buffer *		For verify op it's size of signature part of @src, this part *		is supposed to be operated by cipher. * @dst_len:	Size of @dst buffer (for all ops except verify). *		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. *		For verify op this is size of digest part in @src. * @__ctx:	Start of private context data */struct akcipher_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_akcipher - user-instantiated objects which encapsulate * algorithms and core processing logic * * @reqsize:	Request context size required by algorithm implementation * @base:	Common crypto API algorithm data structure */struct crypto_akcipher {	unsigned int reqsize; 	struct crypto_tfm base;}; /** * struct akcipher_alg - generic public key algorithm * * @sign:	Function performs a sign operation as defined by public key *		algorithm. In case of error, where the dst_len was insufficient, *		the req->dst_len will be updated to the size required for the *		operation * @verify:	Function performs a complete verify operation as defined by *		public key algorithm, returning verification status. Requires *		digest value as input parameter. * @encrypt:	Function performs an encrypt operation as defined by public key *		algorithm. In case of error, where the dst_len was insufficient, *		the req->dst_len will be updated to the size required for the *		operation * @decrypt:	Function performs a decrypt operation as defined by public key *		algorithm. In case of error, where the dst_len was insufficient, *		the req->dst_len will be updated to the size required for the *		operation * @set_pub_key: Function invokes the algorithm specific set public key *		function, which knows how to decode and interpret *		the BER encoded public key and parameters * @set_priv_key: Function invokes the algorithm specific set private key *		function, which knows how to decode and interpret *		the BER encoded private key and parameters * @max_size:	Function returns dest buffer size required for a given key. * @init:	Initialize the cryptographic transformation object. *		This function is used to initialize the cryptographic *		transformation object. This function is called only once at *		the instantiation time, right after the transformation context *		was allocated. In case the cryptographic hardware has some *		special requirements which need to be handled by software, this *		function shall check for the precise requirement of the *		transformation and put any software fallbacks in place. * @exit:	Deinitialize the cryptographic transformation object. This is a *		counterpart to @init, used to remove various changes set in *		@init. * * @base:	Common crypto API algorithm data structure */struct akcipher_alg {	int (*sign)(struct akcipher_request *req);	int (*verify)(struct akcipher_request *req);	int (*encrypt)(struct akcipher_request *req);	int (*decrypt)(struct akcipher_request *req);	int (*set_pub_key)(struct crypto_akcipher *tfm, const void *key,			   unsigned int keylen);	int (*set_priv_key)(struct crypto_akcipher *tfm, const void *key,			    unsigned int keylen);	unsigned int (*max_size)(struct crypto_akcipher *tfm);	int (*init)(struct crypto_akcipher *tfm);	void (*exit)(struct crypto_akcipher *tfm); 	struct crypto_alg base;}; /** * DOC: Generic Public Key API * * The Public Key API is used with the algorithms of type * CRYPTO_ALG_TYPE_AKCIPHER (listed as type "akcipher" in /proc/crypto) */ /** * crypto_alloc_akcipher() - allocate AKCIPHER tfm handle * @alg_name: is the cra_name / name or cra_driver_name / driver name of the *	      public key algorithm e.g. "rsa" * @type: specifies the type of the algorithm * @mask: specifies the mask for the algorithm * * Allocate a handle for public key algorithm. The returned struct * crypto_akcipher is the handle that is required for any subsequent * API invocation for the public key operations. * * Return: allocated handle in case of success; IS_ERR() is true in case *	   of an error, PTR_ERR() returns the error code. */struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,					      u32 mask); static inline struct crypto_tfm *crypto_akcipher_tfm(	struct crypto_akcipher *tfm){	return &tfm->base;} static inline struct akcipher_alg *__crypto_akcipher_alg(struct crypto_alg *alg){	return container_of(alg, struct akcipher_alg, base);} static inline struct crypto_akcipher *__crypto_akcipher_tfm(	struct crypto_tfm *tfm){	return container_of(tfm, struct crypto_akcipher, base);} static inline struct akcipher_alg *crypto_akcipher_alg(	struct crypto_akcipher *tfm){	return __crypto_akcipher_alg(crypto_akcipher_tfm(tfm)->__crt_alg);} static inline unsigned int crypto_akcipher_reqsize(struct crypto_akcipher *tfm){	return tfm->reqsize;} static inline void akcipher_request_set_tfm(struct akcipher_request *req,					    struct crypto_akcipher *tfm){	req->base.tfm = crypto_akcipher_tfm(tfm);} static inline struct crypto_akcipher *crypto_akcipher_reqtfm(	struct akcipher_request *req){	return __crypto_akcipher_tfm(req->base.tfm);} /** * crypto_free_akcipher() - free AKCIPHER tfm handle * * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher() * * If @tfm is a NULL or error pointer, this function does nothing. */static inline void crypto_free_akcipher(struct crypto_akcipher *tfm){	crypto_destroy_tfm(tfm, crypto_akcipher_tfm(tfm));} /** * akcipher_request_alloc() - allocates public key request * * @tfm:	AKCIPHER tfm handle allocated with crypto_alloc_akcipher() * @gfp:	allocation flags * * Return: allocated handle in case of success or NULL in case of an error. */static inline struct akcipher_request *akcipher_request_alloc(	struct crypto_akcipher *tfm, gfp_t gfp){	struct akcipher_request *req; 	req = kmalloc(sizeof(*req) + crypto_akcipher_reqsize(tfm), gfp);	if (likely(req))		akcipher_request_set_tfm(req, tfm); 	return req;} /** * akcipher_request_free() - zeroize and free public key request * * @req:	request to free */static inline void akcipher_request_free(struct akcipher_request *req){	kfree_sensitive(req);} /** * akcipher_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 akcipher_request_set_callback(struct akcipher_request *req,						 u32 flgs,						 crypto_completion_t cmpl,						 void *data){	req->base.complete = cmpl;	req->base.data = data;	req->base.flags = flgs;} /** * akcipher_request_set_crypt() - Sets request parameters * * Sets parameters required by crypto operation * * @req:	public key request * @src:	ptr to input scatter list * @dst:	ptr to output scatter list or NULL for verify op * @src_len:	size of the src input scatter list to be processed * @dst_len:	size of the dst output scatter list or size of signature *		portion in @src for verify op */static inline void akcipher_request_set_crypt(struct akcipher_request *req,					      struct scatterlist *src,					      struct scatterlist *dst,					      unsigned int src_len,					      unsigned int dst_len){	req->src = src;	req->dst = dst;	req->src_len = src_len;	req->dst_len = dst_len;} /** * crypto_akcipher_maxsize() - Get len for output buffer * * Function returns the dest buffer size required for a given key. * Function assumes that the key is already set in the transformation. If this * function is called without a setkey or with a failed setkey, you will end up * in a NULL dereference. * * @tfm:	AKCIPHER tfm handle allocated with crypto_alloc_akcipher() */static inline unsigned int crypto_akcipher_maxsize(struct crypto_akcipher *tfm){	struct akcipher_alg *alg = crypto_akcipher_alg(tfm); 	return alg->max_size(tfm);} /** * crypto_akcipher_encrypt() - Invoke public key encrypt operation * * Function invokes the specific public key encrypt operation for a given * public key algorithm * * @req:	asymmetric key request * * Return: zero on success; error code in case of error */static inline int crypto_akcipher_encrypt(struct akcipher_request *req){	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);	struct akcipher_alg *alg = crypto_akcipher_alg(tfm);	struct crypto_alg *calg = tfm->base.__crt_alg;	unsigned int src_len = req->src_len;	int ret; 	crypto_stats_get(calg);	ret = alg->encrypt(req);	crypto_stats_akcipher_encrypt(src_len, ret, calg);	return ret;} /** * crypto_akcipher_decrypt() - Invoke public key decrypt operation * * Function invokes the specific public key decrypt operation for a given * public key algorithm * * @req:	asymmetric key request * * Return: zero on success; error code in case of error */static inline int crypto_akcipher_decrypt(struct akcipher_request *req){	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);	struct akcipher_alg *alg = crypto_akcipher_alg(tfm);	struct crypto_alg *calg = tfm->base.__crt_alg;	unsigned int src_len = req->src_len;	int ret; 	crypto_stats_get(calg);	ret = alg->decrypt(req);	crypto_stats_akcipher_decrypt(src_len, ret, calg);	return ret;} /** * crypto_akcipher_sign() - Invoke public key sign operation * * Function invokes the specific public key sign operation for a given * public key algorithm * * @req:	asymmetric key request * * Return: zero on success; error code in case of error */static inline int crypto_akcipher_sign(struct akcipher_request *req){	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);	struct akcipher_alg *alg = crypto_akcipher_alg(tfm);	struct crypto_alg *calg = tfm->base.__crt_alg;	int ret; 	crypto_stats_get(calg);	ret = alg->sign(req);	crypto_stats_akcipher_sign(ret, calg);	return ret;} /** * crypto_akcipher_verify() - Invoke public key signature verification * * Function invokes the specific public key signature verification operation * for a given public key algorithm. * * @req:	asymmetric key request * * Note: req->dst should be NULL, req->src should point to SG of size * (req->src_size + req->dst_size), containing signature (of req->src_size * length) with appended digest (of req->dst_size length). * * Return: zero on verification success; error code in case of error. */static inline int crypto_akcipher_verify(struct akcipher_request *req){	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);	struct akcipher_alg *alg = crypto_akcipher_alg(tfm);	struct crypto_alg *calg = tfm->base.__crt_alg;	int ret; 	crypto_stats_get(calg);	ret = alg->verify(req);	crypto_stats_akcipher_verify(ret, calg);	return ret;} /** * crypto_akcipher_set_pub_key() - Invoke set public key operation * * Function invokes the algorithm specific set key function, which knows * how to decode and interpret the encoded key and parameters * * @tfm:	tfm handle * @key:	BER encoded public key, algo OID, paramlen, BER encoded *		parameters * @keylen:	length of the key (not including other data) * * Return: zero on success; error code in case of error */static inline int crypto_akcipher_set_pub_key(struct crypto_akcipher *tfm,					      const void *key,					      unsigned int keylen){	struct akcipher_alg *alg = crypto_akcipher_alg(tfm); 	return alg->set_pub_key(tfm, key, keylen);} /** * crypto_akcipher_set_priv_key() - Invoke set private key operation * * Function invokes the algorithm specific set key function, which knows * how to decode and interpret the encoded key and parameters * * @tfm:	tfm handle * @key:	BER encoded private key, algo OID, paramlen, BER encoded *		parameters * @keylen:	length of the key (not including other data) * * Return: zero on success; error code in case of error */static inline int crypto_akcipher_set_priv_key(struct crypto_akcipher *tfm,					       const void *key,					       unsigned int keylen){	struct akcipher_alg *alg = crypto_akcipher_alg(tfm); 	return alg->set_priv_key(tfm, key, keylen);}#endif