/* * Public Key Encryption * * Copyright (c) 2015, Intel Corporation * Authors: Tadeusz Struk * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #ifndef _CRYPTO_AKCIPHER_H #define _CRYPTO_AKCIPHER_H #include /** * struct akcipher_request - public key request * * @base: Common attributes for async crypto requests * @src: Source data * @dst: Destination data * @src_len: Size of the input buffer * @dst_len: Size of the output buffer. It needs to be at leaset * as big as the expected result depending on the operation * After operation it will be updated with the acctual size of the * result. * In case of error where the dst sgl size was insufficient, * it will be updated to the size required for the operation. * @__ctx: Start of private context data */ struct 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 * * @base: Common crypto API algorithm data structure */ struct crypto_akcipher { 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 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 * @encrypt: Function performs an encrytp 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 * @set_priv_key: Function invokes the algorithm specific set private key * function, which knows how to decode and interpret * the BER encoded private key * @max_size: Function returns dest buffer size reqired 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. * * @reqsize: Request context size required by algorithm implementation * @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); int (*max_size)(struct crypto_akcipher *tfm); int (*init)(struct crypto_akcipher *tfm); void (*exit)(struct crypto_akcipher *tfm); unsigned int reqsize; 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 cr