12874c5fdSThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-or-later */ 24e5f2c40SSalvatore Benedetto /* 34e5f2c40SSalvatore Benedetto * Key-agreement Protocol Primitives (KPP) 44e5f2c40SSalvatore Benedetto * 54e5f2c40SSalvatore Benedetto * Copyright (c) 2016, Intel Corporation 64e5f2c40SSalvatore Benedetto * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com> 74e5f2c40SSalvatore Benedetto */ 84e5f2c40SSalvatore Benedetto 94e5f2c40SSalvatore Benedetto #ifndef _CRYPTO_KPP_ 104e5f2c40SSalvatore Benedetto #define _CRYPTO_KPP_ 114e5f2c40SSalvatore Benedetto #include <linux/crypto.h> 124e5f2c40SSalvatore Benedetto 134e5f2c40SSalvatore Benedetto /** 144e5f2c40SSalvatore Benedetto * struct kpp_request 154e5f2c40SSalvatore Benedetto * 164e5f2c40SSalvatore Benedetto * @base: Common attributes for async crypto requests 174e5f2c40SSalvatore Benedetto * @src: Source data 184e5f2c40SSalvatore Benedetto * @dst: Destination data 194e5f2c40SSalvatore Benedetto * @src_len: Size of the input buffer 204e5f2c40SSalvatore Benedetto * @dst_len: Size of the output buffer. It needs to be at least 214e5f2c40SSalvatore Benedetto * as big as the expected result depending on the operation 224e5f2c40SSalvatore Benedetto * After operation it will be updated with the actual size of the 234e5f2c40SSalvatore Benedetto * result. In case of error where the dst sgl size was insufficient, 244e5f2c40SSalvatore Benedetto * it will be updated to the size required for the operation. 254e5f2c40SSalvatore Benedetto * @__ctx: Start of private context data 264e5f2c40SSalvatore Benedetto */ 274e5f2c40SSalvatore Benedetto struct kpp_request { 284e5f2c40SSalvatore Benedetto struct crypto_async_request base; 294e5f2c40SSalvatore Benedetto struct scatterlist *src; 304e5f2c40SSalvatore Benedetto struct scatterlist *dst; 314e5f2c40SSalvatore Benedetto unsigned int src_len; 324e5f2c40SSalvatore Benedetto unsigned int dst_len; 334e5f2c40SSalvatore Benedetto void *__ctx[] CRYPTO_MINALIGN_ATTR; 344e5f2c40SSalvatore Benedetto }; 354e5f2c40SSalvatore Benedetto 364e5f2c40SSalvatore Benedetto /** 374e5f2c40SSalvatore Benedetto * struct crypto_kpp - user-instantiated object which encapsulate 384e5f2c40SSalvatore Benedetto * algorithms and core processing logic 394e5f2c40SSalvatore Benedetto * 404e5f2c40SSalvatore Benedetto * @base: Common crypto API algorithm data structure 414e5f2c40SSalvatore Benedetto */ 424e5f2c40SSalvatore Benedetto struct crypto_kpp { 434e5f2c40SSalvatore Benedetto struct crypto_tfm base; 444e5f2c40SSalvatore Benedetto }; 454e5f2c40SSalvatore Benedetto 464e5f2c40SSalvatore Benedetto /** 474e5f2c40SSalvatore Benedetto * struct kpp_alg - generic key-agreement protocol primitives 484e5f2c40SSalvatore Benedetto * 494e5f2c40SSalvatore Benedetto * @set_secret: Function invokes the protocol specific function to 504e5f2c40SSalvatore Benedetto * store the secret private key along with parameters. 51c0ca1215STudor-Dan Ambarus * The implementation knows how to decode the buffer 524e5f2c40SSalvatore Benedetto * @generate_public_key: Function generate the public key to be sent to the 534e5f2c40SSalvatore Benedetto * counterpart. In case of error, where output is not big 544e5f2c40SSalvatore Benedetto * enough req->dst_len will be updated to the size 554e5f2c40SSalvatore Benedetto * required 564e5f2c40SSalvatore Benedetto * @compute_shared_secret: Function compute the shared secret as defined by 574e5f2c40SSalvatore Benedetto * the algorithm. The result is given back to the user. 584e5f2c40SSalvatore Benedetto * In case of error, where output is not big enough, 594e5f2c40SSalvatore Benedetto * req->dst_len will be updated to the size required 604e5f2c40SSalvatore Benedetto * @max_size: Function returns the size of the output buffer 614e5f2c40SSalvatore Benedetto * @init: Initialize the object. This is called only once at 624e5f2c40SSalvatore Benedetto * instantiation time. In case the cryptographic hardware 634e5f2c40SSalvatore Benedetto * needs to be initialized. Software fallback should be 644e5f2c40SSalvatore Benedetto * put in place here. 654e5f2c40SSalvatore Benedetto * @exit: Undo everything @init did. 664e5f2c40SSalvatore Benedetto * 674e5f2c40SSalvatore Benedetto * @reqsize: Request context size required by algorithm 684e5f2c40SSalvatore Benedetto * implementation 698d23da22SStephan Mueller * @base: Common crypto API algorithm data structure 704e5f2c40SSalvatore Benedetto */ 714e5f2c40SSalvatore Benedetto struct kpp_alg { 725527dfb6SEric Biggers int (*set_secret)(struct crypto_kpp *tfm, const void *buffer, 734e5f2c40SSalvatore Benedetto unsigned int len); 744e5f2c40SSalvatore Benedetto int (*generate_public_key)(struct kpp_request *req); 754e5f2c40SSalvatore Benedetto int (*compute_shared_secret)(struct kpp_request *req); 764e5f2c40SSalvatore Benedetto 77c444b8daSTudor-Dan Ambarus unsigned int (*max_size)(struct crypto_kpp *tfm); 784e5f2c40SSalvatore Benedetto 794e5f2c40SSalvatore Benedetto int (*init)(struct crypto_kpp *tfm); 804e5f2c40SSalvatore Benedetto void (*exit)(struct crypto_kpp *tfm); 814e5f2c40SSalvatore Benedetto 824e5f2c40SSalvatore Benedetto unsigned int reqsize; 834e5f2c40SSalvatore Benedetto struct crypto_alg base; 844e5f2c40SSalvatore Benedetto }; 854e5f2c40SSalvatore Benedetto 864e5f2c40SSalvatore Benedetto /** 878d23da22SStephan Mueller * DOC: Generic Key-agreement Protocol Primitives API 884e5f2c40SSalvatore Benedetto * 894e5f2c40SSalvatore Benedetto * The KPP API is used with the algorithm type 904e5f2c40SSalvatore Benedetto * CRYPTO_ALG_TYPE_KPP (listed as type "kpp" in /proc/crypto) 914e5f2c40SSalvatore Benedetto */ 924e5f2c40SSalvatore Benedetto 934e5f2c40SSalvatore Benedetto /** 944e5f2c40SSalvatore Benedetto * crypto_alloc_kpp() - allocate KPP tfm handle 954e5f2c40SSalvatore Benedetto * @alg_name: is the name of the kpp algorithm (e.g. "dh", "ecdh") 964e5f2c40SSalvatore Benedetto * @type: specifies the type of the algorithm 974e5f2c40SSalvatore Benedetto * @mask: specifies the mask for the algorithm 984e5f2c40SSalvatore Benedetto * 994e5f2c40SSalvatore Benedetto * Allocate a handle for kpp algorithm. The returned struct crypto_kpp 100c0ca1215STudor-Dan Ambarus * is required for any following API invocation 1014e5f2c40SSalvatore Benedetto * 1024e5f2c40SSalvatore Benedetto * Return: allocated handle in case of success; IS_ERR() is true in case of 1034e5f2c40SSalvatore Benedetto * an error, PTR_ERR() returns the error code. 1044e5f2c40SSalvatore Benedetto */ 1054e5f2c40SSalvatore Benedetto struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask); 1064e5f2c40SSalvatore Benedetto 107*9e2f284eSHannes Reinecke int crypto_has_kpp(const char *alg_name, u32 type, u32 mask); 108*9e2f284eSHannes Reinecke 1094e5f2c40SSalvatore Benedetto static inline struct crypto_tfm *crypto_kpp_tfm(struct crypto_kpp *tfm) 1104e5f2c40SSalvatore Benedetto { 1114e5f2c40SSalvatore Benedetto return &tfm->base; 1124e5f2c40SSalvatore Benedetto } 1134e5f2c40SSalvatore Benedetto 1144e5f2c40SSalvatore Benedetto static inline struct kpp_alg *__crypto_kpp_alg(struct crypto_alg *alg) 1154e5f2c40SSalvatore Benedetto { 1164e5f2c40SSalvatore Benedetto return container_of(alg, struct kpp_alg, base); 1174e5f2c40SSalvatore Benedetto } 1184e5f2c40SSalvatore Benedetto 1194e5f2c40SSalvatore Benedetto static inline struct crypto_kpp *__crypto_kpp_tfm(struct crypto_tfm *tfm) 1204e5f2c40SSalvatore Benedetto { 1214e5f2c40SSalvatore Benedetto return container_of(tfm, struct crypto_kpp, base); 1224e5f2c40SSalvatore Benedetto } 1234e5f2c40SSalvatore Benedetto 1244e5f2c40SSalvatore Benedetto static inline struct kpp_alg *crypto_kpp_alg(struct crypto_kpp *tfm) 1254e5f2c40SSalvatore Benedetto { 1264e5f2c40SSalvatore Benedetto return __crypto_kpp_alg(crypto_kpp_tfm(tfm)->__crt_alg); 1274e5f2c40SSalvatore Benedetto } 1284e5f2c40SSalvatore Benedetto 1294e5f2c40SSalvatore Benedetto static inline unsigned int crypto_kpp_reqsize(struct crypto_kpp *tfm) 1304e5f2c40SSalvatore Benedetto { 1314e5f2c40SSalvatore Benedetto return crypto_kpp_alg(tfm)->reqsize; 1324e5f2c40SSalvatore Benedetto } 1334e5f2c40SSalvatore Benedetto 1344e5f2c40SSalvatore Benedetto static inline void kpp_request_set_tfm(struct kpp_request *req, 1354e5f2c40SSalvatore Benedetto struct crypto_kpp *tfm) 1364e5f2c40SSalvatore Benedetto { 1374e5f2c40SSalvatore Benedetto req->base.tfm = crypto_kpp_tfm(tfm); 1384e5f2c40SSalvatore Benedetto } 1394e5f2c40SSalvatore Benedetto 1404e5f2c40SSalvatore Benedetto static inline struct crypto_kpp *crypto_kpp_reqtfm(struct kpp_request *req) 1414e5f2c40SSalvatore Benedetto { 1424e5f2c40SSalvatore Benedetto return __crypto_kpp_tfm(req->base.tfm); 1434e5f2c40SSalvatore Benedetto } 1444e5f2c40SSalvatore Benedetto 14566d3994cSTudor-Dan Ambarus static inline u32 crypto_kpp_get_flags(struct crypto_kpp *tfm) 14666d3994cSTudor-Dan Ambarus { 14766d3994cSTudor-Dan Ambarus return crypto_tfm_get_flags(crypto_kpp_tfm(tfm)); 14866d3994cSTudor-Dan Ambarus } 14966d3994cSTudor-Dan Ambarus 15066d3994cSTudor-Dan Ambarus static inline void crypto_kpp_set_flags(struct crypto_kpp *tfm, u32 flags) 15166d3994cSTudor-Dan Ambarus { 15266d3994cSTudor-Dan Ambarus crypto_tfm_set_flags(crypto_kpp_tfm(tfm), flags); 15366d3994cSTudor-Dan Ambarus } 15466d3994cSTudor-Dan Ambarus 1554e5f2c40SSalvatore Benedetto /** 1564e5f2c40SSalvatore Benedetto * crypto_free_kpp() - free KPP tfm handle 1574e5f2c40SSalvatore Benedetto * 1584e5f2c40SSalvatore Benedetto * @tfm: KPP tfm handle allocated with crypto_alloc_kpp() 15983681f2bSArd Biesheuvel * 16083681f2bSArd Biesheuvel * If @tfm is a NULL or error pointer, this function does nothing. 1614e5f2c40SSalvatore Benedetto */ 1624e5f2c40SSalvatore Benedetto static inline void crypto_free_kpp(struct crypto_kpp *tfm) 1634e5f2c40SSalvatore Benedetto { 1644e5f2c40SSalvatore Benedetto crypto_destroy_tfm(tfm, crypto_kpp_tfm(tfm)); 1654e5f2c40SSalvatore Benedetto } 1664e5f2c40SSalvatore Benedetto 1674e5f2c40SSalvatore Benedetto /** 1684e5f2c40SSalvatore Benedetto * kpp_request_alloc() - allocates kpp request 1694e5f2c40SSalvatore Benedetto * 1704e5f2c40SSalvatore Benedetto * @tfm: KPP tfm handle allocated with crypto_alloc_kpp() 1714e5f2c40SSalvatore Benedetto * @gfp: allocation flags 1724e5f2c40SSalvatore Benedetto * 1734e5f2c40SSalvatore Benedetto * Return: allocated handle in case of success or NULL in case of an error. 1744e5f2c40SSalvatore Benedetto */ 1754e5f2c40SSalvatore Benedetto static inline struct kpp_request *kpp_request_alloc(struct crypto_kpp *tfm, 1764e5f2c40SSalvatore Benedetto gfp_t gfp) 1774e5f2c40SSalvatore Benedetto { 1784e5f2c40SSalvatore Benedetto struct kpp_request *req; 1794e5f2c40SSalvatore Benedetto 1804e5f2c40SSalvatore Benedetto req = kmalloc(sizeof(*req) + crypto_kpp_reqsize(tfm), gfp); 1814e5f2c40SSalvatore Benedetto if (likely(req)) 1824e5f2c40SSalvatore Benedetto kpp_request_set_tfm(req, tfm); 1834e5f2c40SSalvatore Benedetto 1844e5f2c40SSalvatore Benedetto return req; 1854e5f2c40SSalvatore Benedetto } 1864e5f2c40SSalvatore Benedetto 1874e5f2c40SSalvatore Benedetto /** 1884e5f2c40SSalvatore Benedetto * kpp_request_free() - zeroize and free kpp request 1894e5f2c40SSalvatore Benedetto * 1904e5f2c40SSalvatore Benedetto * @req: request to free 1914e5f2c40SSalvatore Benedetto */ 1924e5f2c40SSalvatore Benedetto static inline void kpp_request_free(struct kpp_request *req) 1934e5f2c40SSalvatore Benedetto { 194453431a5SWaiman Long kfree_sensitive(req); 1954e5f2c40SSalvatore Benedetto } 1964e5f2c40SSalvatore Benedetto 1974e5f2c40SSalvatore Benedetto /** 1984e5f2c40SSalvatore Benedetto * kpp_request_set_callback() - Sets an asynchronous callback. 1994e5f2c40SSalvatore Benedetto * 2004e5f2c40SSalvatore Benedetto * Callback will be called when an asynchronous operation on a given 2014e5f2c40SSalvatore Benedetto * request is finished. 2024e5f2c40SSalvatore Benedetto * 2034e5f2c40SSalvatore Benedetto * @req: request that the callback will be set for 2044e5f2c40SSalvatore Benedetto * @flgs: specify for instance if the operation may backlog 2054e5f2c40SSalvatore Benedetto * @cmpl: callback which will be called 2064e5f2c40SSalvatore Benedetto * @data: private data used by the caller 2074e5f2c40SSalvatore Benedetto */ 2084e5f2c40SSalvatore Benedetto static inline void kpp_request_set_callback(struct kpp_request *req, 2094e5f2c40SSalvatore Benedetto u32 flgs, 2104e5f2c40SSalvatore Benedetto crypto_completion_t cmpl, 2114e5f2c40SSalvatore Benedetto void *data) 2124e5f2c40SSalvatore Benedetto { 2134e5f2c40SSalvatore Benedetto req->base.complete = cmpl; 2144e5f2c40SSalvatore Benedetto req->base.data = data; 2154e5f2c40SSalvatore Benedetto req->base.flags = flgs; 2164e5f2c40SSalvatore Benedetto } 2174e5f2c40SSalvatore Benedetto 2184e5f2c40SSalvatore Benedetto /** 2194e5f2c40SSalvatore Benedetto * kpp_request_set_input() - Sets input buffer 2204e5f2c40SSalvatore Benedetto * 2214e5f2c40SSalvatore Benedetto * Sets parameters required by generate_public_key 2224e5f2c40SSalvatore Benedetto * 2234e5f2c40SSalvatore Benedetto * @req: kpp request 2244e5f2c40SSalvatore Benedetto * @input: ptr to input scatter list 2254e5f2c40SSalvatore Benedetto * @input_len: size of the input scatter list 2264e5f2c40SSalvatore Benedetto */ 2274e5f2c40SSalvatore Benedetto static inline void kpp_request_set_input(struct kpp_request *req, 2284e5f2c40SSalvatore Benedetto struct scatterlist *input, 2294e5f2c40SSalvatore Benedetto unsigned int input_len) 2304e5f2c40SSalvatore Benedetto { 2314e5f2c40SSalvatore Benedetto req->src = input; 2324e5f2c40SSalvatore Benedetto req->src_len = input_len; 2334e5f2c40SSalvatore Benedetto } 2344e5f2c40SSalvatore Benedetto 2354e5f2c40SSalvatore Benedetto /** 2364e5f2c40SSalvatore Benedetto * kpp_request_set_output() - Sets output buffer 2374e5f2c40SSalvatore Benedetto * 2384e5f2c40SSalvatore Benedetto * Sets parameters required by kpp operation 2394e5f2c40SSalvatore Benedetto * 2404e5f2c40SSalvatore Benedetto * @req: kpp request 2414e5f2c40SSalvatore Benedetto * @output: ptr to output scatter list 2424e5f2c40SSalvatore Benedetto * @output_len: size of the output scatter list 2434e5f2c40SSalvatore Benedetto */ 2444e5f2c40SSalvatore Benedetto static inline void kpp_request_set_output(struct kpp_request *req, 2454e5f2c40SSalvatore Benedetto struct scatterlist *output, 2464e5f2c40SSalvatore Benedetto unsigned int output_len) 2474e5f2c40SSalvatore Benedetto { 2484e5f2c40SSalvatore Benedetto req->dst = output; 2494e5f2c40SSalvatore Benedetto req->dst_len = output_len; 2504e5f2c40SSalvatore Benedetto } 2514e5f2c40SSalvatore Benedetto 2524e5f2c40SSalvatore Benedetto enum { 2534e5f2c40SSalvatore Benedetto CRYPTO_KPP_SECRET_TYPE_UNKNOWN, 254802c7f1cSSalvatore Benedetto CRYPTO_KPP_SECRET_TYPE_DH, 2553c4b2390SSalvatore Benedetto CRYPTO_KPP_SECRET_TYPE_ECDH, 2564e5f2c40SSalvatore Benedetto }; 2574e5f2c40SSalvatore Benedetto 2584e5f2c40SSalvatore Benedetto /** 2594e5f2c40SSalvatore Benedetto * struct kpp_secret - small header for packing secret buffer 2604e5f2c40SSalvatore Benedetto * 2614e5f2c40SSalvatore Benedetto * @type: define type of secret. Each kpp type will define its own 2624e5f2c40SSalvatore Benedetto * @len: specify the len of the secret, include the header, that 2634e5f2c40SSalvatore Benedetto * follows the struct 2644e5f2c40SSalvatore Benedetto */ 2654e5f2c40SSalvatore Benedetto struct kpp_secret { 2664e5f2c40SSalvatore Benedetto unsigned short type; 2674e5f2c40SSalvatore Benedetto unsigned short len; 2684e5f2c40SSalvatore Benedetto }; 2694e5f2c40SSalvatore Benedetto 2704e5f2c40SSalvatore Benedetto /** 2714e5f2c40SSalvatore Benedetto * crypto_kpp_set_secret() - Invoke kpp operation 2724e5f2c40SSalvatore Benedetto * 2734e5f2c40SSalvatore Benedetto * Function invokes the specific kpp operation for a given alg. 2744e5f2c40SSalvatore Benedetto * 2754e5f2c40SSalvatore Benedetto * @tfm: tfm handle 2768d23da22SStephan Mueller * @buffer: Buffer holding the packet representation of the private 2778d23da22SStephan Mueller * key. The structure of the packet key depends on the particular 2788d23da22SStephan Mueller * KPP implementation. Packing and unpacking helpers are provided 2798d23da22SStephan Mueller * for ECDH and DH (see the respective header files for those 2808d23da22SStephan Mueller * implementations). 2818d23da22SStephan Mueller * @len: Length of the packet private key buffer. 2824e5f2c40SSalvatore Benedetto * 2834e5f2c40SSalvatore Benedetto * Return: zero on success; error code in case of error 2844e5f2c40SSalvatore Benedetto */ 2855527dfb6SEric Biggers static inline int crypto_kpp_set_secret(struct crypto_kpp *tfm, 2865527dfb6SEric Biggers const void *buffer, unsigned int len) 2874e5f2c40SSalvatore Benedetto { 2884e5f2c40SSalvatore Benedetto struct kpp_alg *alg = crypto_kpp_alg(tfm); 289f7d76e05SCorentin Labbe struct crypto_alg *calg = tfm->base.__crt_alg; 290cac5818cSCorentin Labbe int ret; 2914e5f2c40SSalvatore Benedetto 292f7d76e05SCorentin Labbe crypto_stats_get(calg); 293cac5818cSCorentin Labbe ret = alg->set_secret(tfm, buffer, len); 294f7d76e05SCorentin Labbe crypto_stats_kpp_set_secret(calg, ret); 295cac5818cSCorentin Labbe return ret; 2964e5f2c40SSalvatore Benedetto } 2974e5f2c40SSalvatore Benedetto 2984e5f2c40SSalvatore Benedetto /** 2994e5f2c40SSalvatore Benedetto * crypto_kpp_generate_public_key() - Invoke kpp operation 3004e5f2c40SSalvatore Benedetto * 3014e5f2c40SSalvatore Benedetto * Function invokes the specific kpp operation for generating the public part 3028d23da22SStephan Mueller * for a given kpp algorithm. 3038d23da22SStephan Mueller * 3048d23da22SStephan Mueller * To generate a private key, the caller should use a random number generator. 3058d23da22SStephan Mueller * The output of the requested length serves as the private key. 3064e5f2c40SSalvatore Benedetto * 3074e5f2c40SSalvatore Benedetto * @req: kpp key request 3084e5f2c40SSalvatore Benedetto * 3094e5f2c40SSalvatore Benedetto * Return: zero on success; error code in case of error 3104e5f2c40SSalvatore Benedetto */ 3114e5f2c40SSalvatore Benedetto static inline int crypto_kpp_generate_public_key(struct kpp_request *req) 3124e5f2c40SSalvatore Benedetto { 3134e5f2c40SSalvatore Benedetto struct crypto_kpp *tfm = crypto_kpp_reqtfm(req); 3144e5f2c40SSalvatore Benedetto struct kpp_alg *alg = crypto_kpp_alg(tfm); 315f7d76e05SCorentin Labbe struct crypto_alg *calg = tfm->base.__crt_alg; 316cac5818cSCorentin Labbe int ret; 3174e5f2c40SSalvatore Benedetto 318f7d76e05SCorentin Labbe crypto_stats_get(calg); 319cac5818cSCorentin Labbe ret = alg->generate_public_key(req); 320f7d76e05SCorentin Labbe crypto_stats_kpp_generate_public_key(calg, ret); 321cac5818cSCorentin Labbe return ret; 3224e5f2c40SSalvatore Benedetto } 3234e5f2c40SSalvatore Benedetto 3244e5f2c40SSalvatore Benedetto /** 3254e5f2c40SSalvatore Benedetto * crypto_kpp_compute_shared_secret() - Invoke kpp operation 3264e5f2c40SSalvatore Benedetto * 3274e5f2c40SSalvatore Benedetto * Function invokes the specific kpp operation for computing the shared secret 3284e5f2c40SSalvatore Benedetto * for a given kpp algorithm. 3294e5f2c40SSalvatore Benedetto * 3304e5f2c40SSalvatore Benedetto * @req: kpp key request 3314e5f2c40SSalvatore Benedetto * 3324e5f2c40SSalvatore Benedetto * Return: zero on success; error code in case of error 3334e5f2c40SSalvatore Benedetto */ 3344e5f2c40SSalvatore Benedetto static inline int crypto_kpp_compute_shared_secret(struct kpp_request *req) 3354e5f2c40SSalvatore Benedetto { 3364e5f2c40SSalvatore Benedetto struct crypto_kpp *tfm = crypto_kpp_reqtfm(req); 3374e5f2c40SSalvatore Benedetto struct kpp_alg *alg = crypto_kpp_alg(tfm); 338f7d76e05SCorentin Labbe struct crypto_alg *calg = tfm->base.__crt_alg; 339cac5818cSCorentin Labbe int ret; 3404e5f2c40SSalvatore Benedetto 341f7d76e05SCorentin Labbe crypto_stats_get(calg); 342cac5818cSCorentin Labbe ret = alg->compute_shared_secret(req); 343f7d76e05SCorentin Labbe crypto_stats_kpp_compute_shared_secret(calg, ret); 344cac5818cSCorentin Labbe return ret; 3454e5f2c40SSalvatore Benedetto } 3464e5f2c40SSalvatore Benedetto 3474e5f2c40SSalvatore Benedetto /** 3484e5f2c40SSalvatore Benedetto * crypto_kpp_maxsize() - Get len for output buffer 3494e5f2c40SSalvatore Benedetto * 350c444b8daSTudor-Dan Ambarus * Function returns the output buffer size required for a given key. 351c444b8daSTudor-Dan Ambarus * Function assumes that the key is already set in the transformation. If this 352c444b8daSTudor-Dan Ambarus * function is called without a setkey or with a failed setkey, you will end up 353c444b8daSTudor-Dan Ambarus * in a NULL dereference. 3544e5f2c40SSalvatore Benedetto * 3554e5f2c40SSalvatore Benedetto * @tfm: KPP tfm handle allocated with crypto_alloc_kpp() 3564e5f2c40SSalvatore Benedetto */ 357c444b8daSTudor-Dan Ambarus static inline unsigned int crypto_kpp_maxsize(struct crypto_kpp *tfm) 3584e5f2c40SSalvatore Benedetto { 3594e5f2c40SSalvatore Benedetto struct kpp_alg *alg = crypto_kpp_alg(tfm); 3604e5f2c40SSalvatore Benedetto 3614e5f2c40SSalvatore Benedetto return alg->max_size(tfm); 3624e5f2c40SSalvatore Benedetto } 3634e5f2c40SSalvatore Benedetto 3644e5f2c40SSalvatore Benedetto #endif 365