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418 lines
13 KiB
418 lines
13 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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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 <[email protected]> |
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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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* For verify op this is signature + digest, in that case |
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* total size of @src is @src_len + @dst_len. |
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* @dst: Destination data (Should be NULL for verify op) |
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* @src_len: Size of the input buffer |
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* For verify op it's size of signature part of @src, this part |
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* is supposed to be operated by cipher. |
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* @dst_len: Size of @dst buffer (for all ops except verify). |
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* It needs to be at least as big as the expected result |
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* 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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* For verify op this is size of digest part in @src. |
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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 complete verify operation as defined by |
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* public key algorithm, returning verification status. Requires |
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* digest value as input parameter. |
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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 and parameters |
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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 and parameters |
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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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* If @tfm is a NULL or error pointer, this function does nothing. |
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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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kfree_sensitive(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 or NULL for verify op |
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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 or size of signature |
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* portion in @src for verify op |
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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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struct crypto_alg *calg = tfm->base.__crt_alg; |
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unsigned int src_len = req->src_len; |
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int ret; |
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crypto_stats_get(calg); |
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ret = alg->encrypt(req); |
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crypto_stats_akcipher_encrypt(src_len, ret, calg); |
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return ret; |
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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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struct crypto_alg *calg = tfm->base.__crt_alg; |
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unsigned int src_len = req->src_len; |
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int ret; |
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crypto_stats_get(calg); |
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ret = alg->decrypt(req); |
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crypto_stats_akcipher_decrypt(src_len, ret, calg); |
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return ret; |
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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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struct crypto_alg *calg = tfm->base.__crt_alg; |
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int ret; |
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crypto_stats_get(calg); |
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ret = alg->sign(req); |
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crypto_stats_akcipher_sign(ret, calg); |
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return ret; |
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} |
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/** |
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* crypto_akcipher_verify() - Invoke public key signature verification |
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* |
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* Function invokes the specific public key signature verification operation |
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* for a given public key algorithm. |
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* |
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* @req: asymmetric key request |
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* |
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* Note: req->dst should be NULL, req->src should point to SG of size |
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* (req->src_size + req->dst_size), containing signature (of req->src_size |
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* length) with appended digest (of req->dst_size length). |
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* |
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* Return: zero on verification 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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struct crypto_alg *calg = tfm->base.__crt_alg; |
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int ret; |
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crypto_stats_get(calg); |
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ret = alg->verify(req); |
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crypto_stats_akcipher_verify(ret, calg); |
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return ret; |
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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 and parameters |
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* |
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* @tfm: tfm handle |
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* @key: BER encoded public key, algo OID, paramlen, BER encoded |
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* parameters |
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* @keylen: length of the key (not including other data) |
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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 and parameters |
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* |
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* @tfm: tfm handle |
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* @key: BER encoded private key, algo OID, paramlen, BER encoded |
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* parameters |
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* @keylen: length of the key (not including other data) |
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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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