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Diffstat (limited to 'include/crypto/skcipher.h')
| -rw-r--r-- | include/crypto/skcipher.h | 946 |
1 files changed, 888 insertions, 58 deletions
diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h index 25fd6126522d..9e5853464345 100644 --- a/include/crypto/skcipher.h +++ b/include/crypto/skcipher.h @@ -1,109 +1,939 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Symmetric key ciphers. * - * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> - * - * 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. - * + * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au> */ #ifndef _CRYPTO_SKCIPHER_H #define _CRYPTO_SKCIPHER_H +#include <linux/atomic.h> +#include <linux/container_of.h> #include <linux/crypto.h> -#include <linux/kernel.h> #include <linux/slab.h> +#include <linux/string.h> +#include <linux/types.h> + +/* Set this bit if the lskcipher operation is a continuation. */ +#define CRYPTO_LSKCIPHER_FLAG_CONT 0x00000001 +/* Set this bit if the lskcipher operation is final. */ +#define CRYPTO_LSKCIPHER_FLAG_FINAL 0x00000002 +/* The bit CRYPTO_TFM_REQ_MAY_SLEEP can also be set if needed. */ + +/* Set this bit if the skcipher operation is a continuation. */ +#define CRYPTO_SKCIPHER_REQ_CONT 0x00000001 +/* Set this bit if the skcipher operation is not final. */ +#define CRYPTO_SKCIPHER_REQ_NOTFINAL 0x00000002 + +struct scatterlist; /** - * struct skcipher_givcrypt_request - Crypto request with IV generation - * @seq: Sequence number for IV generation - * @giv: Space for generated IV - * @creq: The crypto request itself + * struct skcipher_request - Symmetric key cipher request + * @cryptlen: Number of bytes to encrypt or decrypt + * @iv: Initialisation Vector + * @src: Source SG list + * @dst: Destination SG list + * @base: Underlying async request + * @__ctx: Start of private context data */ -struct skcipher_givcrypt_request { - u64 seq; - u8 *giv; +struct skcipher_request { + unsigned int cryptlen; - struct ablkcipher_request creq; + u8 *iv; + + struct scatterlist *src; + struct scatterlist *dst; + + struct crypto_async_request base; + + void *__ctx[] CRYPTO_MINALIGN_ATTR; }; -static inline struct crypto_ablkcipher *skcipher_givcrypt_reqtfm( - struct skcipher_givcrypt_request *req) +struct crypto_skcipher { + unsigned int reqsize; + + struct crypto_tfm base; +}; + +struct crypto_sync_skcipher { + struct crypto_skcipher base; +}; + +struct crypto_lskcipher { + struct crypto_tfm base; +}; + +/* + * struct skcipher_alg_common - common properties of skcipher_alg + * @min_keysize: Minimum key size supported by the transformation. This is the + * smallest key length supported by this transformation algorithm. + * This must be set to one of the pre-defined values as this is + * not hardware specific. Possible values for this field can be + * found via git grep "_MIN_KEY_SIZE" include/crypto/ + * @max_keysize: Maximum key size supported by the transformation. This is the + * largest key length supported by this transformation algorithm. + * This must be set to one of the pre-defined values as this is + * not hardware specific. Possible values for this field can be + * found via git grep "_MAX_KEY_SIZE" include/crypto/ + * @ivsize: IV size applicable for transformation. The consumer must provide an + * IV of exactly that size to perform the encrypt or decrypt operation. + * @chunksize: Equal to the block size except for stream ciphers such as + * CTR where it is set to the underlying block size. + * @statesize: Size of the internal state for the algorithm. + * @base: Definition of a generic crypto algorithm. + */ +#define SKCIPHER_ALG_COMMON { \ + unsigned int min_keysize; \ + unsigned int max_keysize; \ + unsigned int ivsize; \ + unsigned int chunksize; \ + unsigned int statesize; \ + \ + struct crypto_alg base; \ +} +struct skcipher_alg_common SKCIPHER_ALG_COMMON; + +/** + * struct skcipher_alg - symmetric key cipher definition + * @setkey: Set key for the transformation. This function is used to either + * program a supplied key into the hardware or store the key in the + * transformation context for programming it later. Note that this + * function does modify the transformation context. This function can + * be called multiple times during the existence of the transformation + * object, so one must make sure the key is properly reprogrammed into + * the hardware. This function is also responsible for checking the key + * length for validity. In case a software fallback was put in place in + * the @cra_init call, this function might need to use the fallback if + * the algorithm doesn't support all of the key sizes. + * @encrypt: Encrypt a scatterlist of blocks. This function is used to encrypt + * the supplied scatterlist containing the blocks of data. The crypto + * API consumer is responsible for aligning the entries of the + * scatterlist properly and making sure the chunks are correctly + * sized. In case a software fallback was put in place in the + * @cra_init call, this function might need to use the fallback if + * the algorithm doesn't support all of the key sizes. In case the + * key was stored in transformation context, the key might need to be + * re-programmed into the hardware in this function. This function + * shall not modify the transformation context, as this function may + * be called in parallel with the same transformation object. + * @decrypt: Decrypt a single block. This is a reverse counterpart to @encrypt + * and the conditions are exactly the same. + * @export: Export partial state of the transformation. This function dumps the + * entire state of the ongoing transformation into a provided block of + * data so it can be @import 'ed back later on. This is useful in case + * you want to save partial result of the transformation after + * processing certain amount of data and reload this partial result + * multiple times later on for multiple re-use. No data processing + * happens at this point. + * @import: Import partial state of the transformation. This function loads the + * entire state of the ongoing transformation from a provided block of + * data so the transformation can continue from this point onward. No + * data processing happens at this point. + * @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. + * @walksize: Equal to the chunk size except in cases where the algorithm is + * considerably more efficient if it can operate on multiple chunks + * in parallel. Should be a multiple of chunksize. + * @co: see struct skcipher_alg_common + * + * All fields except @ivsize are mandatory and must be filled. + */ +struct skcipher_alg { + int (*setkey)(struct crypto_skcipher *tfm, const u8 *key, + unsigned int keylen); + int (*encrypt)(struct skcipher_request *req); + int (*decrypt)(struct skcipher_request *req); + int (*export)(struct skcipher_request *req, void *out); + int (*import)(struct skcipher_request *req, const void *in); + int (*init)(struct crypto_skcipher *tfm); + void (*exit)(struct crypto_skcipher *tfm); + + unsigned int walksize; + + union { + struct SKCIPHER_ALG_COMMON; + struct skcipher_alg_common co; + }; +}; + +/** + * struct lskcipher_alg - linear symmetric key cipher definition + * @setkey: Set key for the transformation. This function is used to either + * program a supplied key into the hardware or store the key in the + * transformation context for programming it later. Note that this + * function does modify the transformation context. This function can + * be called multiple times during the existence of the transformation + * object, so one must make sure the key is properly reprogrammed into + * the hardware. This function is also responsible for checking the key + * length for validity. In case a software fallback was put in place in + * the @cra_init call, this function might need to use the fallback if + * the algorithm doesn't support all of the key sizes. + * @encrypt: Encrypt a number of bytes. This function is used to encrypt + * the supplied data. This function shall not modify + * the transformation context, as this function may be called + * in parallel with the same transformation object. Data + * may be left over if length is not a multiple of blocks + * and there is more to come (final == false). The number of + * left-over bytes should be returned in case of success. + * The siv field shall be as long as ivsize + statesize with + * the IV placed at the front. The state will be used by the + * algorithm internally. + * @decrypt: Decrypt a number of bytes. This is a reverse counterpart to + * @encrypt and the conditions are exactly the same. + * @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. + * @exit: Deinitialize the cryptographic transformation object. This is a + * counterpart to @init, used to remove various changes set in + * @init. + * @co: see struct skcipher_alg_common + */ +struct lskcipher_alg { + int (*setkey)(struct crypto_lskcipher *tfm, const u8 *key, + unsigned int keylen); + int (*encrypt)(struct crypto_lskcipher *tfm, const u8 *src, + u8 *dst, unsigned len, u8 *siv, u32 flags); + int (*decrypt)(struct crypto_lskcipher *tfm, const u8 *src, + u8 *dst, unsigned len, u8 *siv, u32 flags); + int (*init)(struct crypto_lskcipher *tfm); + void (*exit)(struct crypto_lskcipher *tfm); + + struct skcipher_alg_common co; +}; + +#define MAX_SYNC_SKCIPHER_REQSIZE 384 +/* + * This performs a type-check against the "_tfm" argument to make sure + * all users have the correct skcipher tfm for doing on-stack requests. + */ +#define SYNC_SKCIPHER_REQUEST_ON_STACK(name, _tfm) \ + char __##name##_desc[sizeof(struct skcipher_request) + \ + MAX_SYNC_SKCIPHER_REQSIZE \ + ] CRYPTO_MINALIGN_ATTR; \ + struct skcipher_request *name = \ + (((struct skcipher_request *)__##name##_desc)->base.tfm = \ + crypto_sync_skcipher_tfm((_tfm)), \ + (void *)__##name##_desc) + +/** + * DOC: Symmetric Key Cipher API + * + * Symmetric key cipher API is used with the ciphers of type + * CRYPTO_ALG_TYPE_SKCIPHER (listed as type "skcipher" in /proc/crypto). + * + * Asynchronous cipher operations imply that the function invocation for a + * cipher request returns immediately before the completion of the operation. + * The cipher request is scheduled as a separate kernel thread and therefore + * load-balanced on the different CPUs via the process scheduler. To allow + * the kernel crypto API to inform the caller about the completion of a cipher + * request, the caller must provide a callback function. That function is + * invoked with the cipher handle when the request completes. + * + * To support the asynchronous operation, additional information than just the + * cipher handle must be supplied to the kernel crypto API. That additional + * information is given by filling in the skcipher_request data structure. + * + * For the symmetric key cipher API, the state is maintained with the tfm + * cipher handle. A single tfm can be used across multiple calls and in + * parallel. For asynchronous block cipher calls, context data supplied and + * only used by the caller can be referenced the request data structure in + * addition to the IV used for the cipher request. The maintenance of such + * state information would be important for a crypto driver implementer to + * have, because when calling the callback function upon completion of the + * cipher operation, that callback function may need some information about + * which operation just finished if it invoked multiple in parallel. This + * state information is unused by the kernel crypto API. + */ + +static inline struct crypto_skcipher *__crypto_skcipher_cast( + struct crypto_tfm *tfm) { - return crypto_ablkcipher_reqtfm(&req->creq); + return container_of(tfm, struct crypto_skcipher, base); } -static inline int crypto_skcipher_givencrypt( - struct skcipher_givcrypt_request *req) +/** + * crypto_alloc_skcipher() - allocate symmetric key cipher handle + * @alg_name: is the cra_name / name or cra_driver_name / driver name of the + * skcipher cipher + * @type: specifies the type of the cipher + * @mask: specifies the mask for the cipher + * + * Allocate a cipher handle for an skcipher. The returned struct + * crypto_skcipher is the cipher handle that is required for any subsequent + * API invocation for that skcipher. + * + * Return: allocated cipher handle in case of success; IS_ERR() is true in case + * of an error, PTR_ERR() returns the error code. + */ +struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, + u32 type, u32 mask); + +struct crypto_sync_skcipher *crypto_alloc_sync_skcipher(const char *alg_name, + u32 type, u32 mask); + + +/** + * crypto_alloc_lskcipher() - allocate linear symmetric key cipher handle + * @alg_name: is the cra_name / name or cra_driver_name / driver name of the + * lskcipher + * @type: specifies the type of the cipher + * @mask: specifies the mask for the cipher + * + * Allocate a cipher handle for an lskcipher. The returned struct + * crypto_lskcipher is the cipher handle that is required for any subsequent + * API invocation for that lskcipher. + * + * Return: allocated cipher handle in case of success; IS_ERR() is true in case + * of an error, PTR_ERR() returns the error code. + */ +struct crypto_lskcipher *crypto_alloc_lskcipher(const char *alg_name, + u32 type, u32 mask); + +static inline struct crypto_tfm *crypto_skcipher_tfm( + struct crypto_skcipher *tfm) { - struct ablkcipher_tfm *crt = - crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req)); - return crt->givencrypt(req); -}; + return &tfm->base; +} -static inline int crypto_skcipher_givdecrypt( - struct skcipher_givcrypt_request *req) +static inline struct crypto_tfm *crypto_lskcipher_tfm( + struct crypto_lskcipher *tfm) { - struct ablkcipher_tfm *crt = - crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req)); - return crt->givdecrypt(req); -}; + return &tfm->base; +} + +static inline struct crypto_tfm *crypto_sync_skcipher_tfm( + struct crypto_sync_skcipher *tfm) +{ + return crypto_skcipher_tfm(&tfm->base); +} + +/** + * crypto_free_skcipher() - zeroize and free cipher handle + * @tfm: cipher handle to be freed + * + * If @tfm is a NULL or error pointer, this function does nothing. + */ +static inline void crypto_free_skcipher(struct crypto_skcipher *tfm) +{ + crypto_destroy_tfm(tfm, crypto_skcipher_tfm(tfm)); +} + +static inline void crypto_free_sync_skcipher(struct crypto_sync_skcipher *tfm) +{ + crypto_free_skcipher(&tfm->base); +} + +/** + * crypto_free_lskcipher() - zeroize and free cipher handle + * @tfm: cipher handle to be freed + * + * If @tfm is a NULL or error pointer, this function does nothing. + */ +static inline void crypto_free_lskcipher(struct crypto_lskcipher *tfm) +{ + crypto_destroy_tfm(tfm, crypto_lskcipher_tfm(tfm)); +} + +/** + * crypto_has_skcipher() - Search for the availability of an skcipher. + * @alg_name: is the cra_name / name or cra_driver_name / driver name of the + * skcipher + * @type: specifies the type of the skcipher + * @mask: specifies the mask for the skcipher + * + * Return: true when the skcipher is known to the kernel crypto API; false + * otherwise + */ +int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask); + +static inline const char *crypto_skcipher_driver_name( + struct crypto_skcipher *tfm) +{ + return crypto_tfm_alg_driver_name(crypto_skcipher_tfm(tfm)); +} + +static inline const char *crypto_lskcipher_driver_name( + struct crypto_lskcipher *tfm) +{ + return crypto_tfm_alg_driver_name(crypto_lskcipher_tfm(tfm)); +} + +static inline struct skcipher_alg_common *crypto_skcipher_alg_common( + struct crypto_skcipher *tfm) +{ + return container_of(crypto_skcipher_tfm(tfm)->__crt_alg, + struct skcipher_alg_common, base); +} + +static inline struct skcipher_alg *crypto_skcipher_alg( + struct crypto_skcipher *tfm) +{ + return container_of(crypto_skcipher_tfm(tfm)->__crt_alg, + struct skcipher_alg, base); +} + +static inline struct lskcipher_alg *crypto_lskcipher_alg( + struct crypto_lskcipher *tfm) +{ + return container_of(crypto_lskcipher_tfm(tfm)->__crt_alg, + struct lskcipher_alg, co.base); +} + +/** + * crypto_skcipher_ivsize() - obtain IV size + * @tfm: cipher handle + * + * The size of the IV for the skcipher referenced by the cipher handle is + * returned. This IV size may be zero if the cipher does not need an IV. + * + * Return: IV size in bytes + */ +static inline unsigned int crypto_skcipher_ivsize(struct crypto_skcipher *tfm) +{ + return crypto_skcipher_alg_common(tfm)->ivsize; +} + +static inline unsigned int crypto_sync_skcipher_ivsize( + struct crypto_sync_skcipher *tfm) +{ + return crypto_skcipher_ivsize(&tfm->base); +} + +/** + * crypto_lskcipher_ivsize() - obtain IV size + * @tfm: cipher handle + * + * The size of the IV for the lskcipher referenced by the cipher handle is + * returned. This IV size may be zero if the cipher does not need an IV. + * + * Return: IV size in bytes + */ +static inline unsigned int crypto_lskcipher_ivsize( + struct crypto_lskcipher *tfm) +{ + return crypto_lskcipher_alg(tfm)->co.ivsize; +} + +/** + * crypto_skcipher_blocksize() - obtain block size of cipher + * @tfm: cipher handle + * + * The block size for the skcipher referenced with the cipher handle is + * returned. The caller may use that information to allocate appropriate + * memory for the data returned by the encryption or decryption operation + * + * Return: block size of cipher + */ +static inline unsigned int crypto_skcipher_blocksize( + struct crypto_skcipher *tfm) +{ + return crypto_tfm_alg_blocksize(crypto_skcipher_tfm(tfm)); +} + +/** + * crypto_lskcipher_blocksize() - obtain block size of cipher + * @tfm: cipher handle + * + * The block size for the lskcipher referenced with the cipher handle is + * returned. The caller may use that information to allocate appropriate + * memory for the data returned by the encryption or decryption operation + * + * Return: block size of cipher + */ +static inline unsigned int crypto_lskcipher_blocksize( + struct crypto_lskcipher *tfm) +{ + return crypto_tfm_alg_blocksize(crypto_lskcipher_tfm(tfm)); +} + +/** + * crypto_skcipher_chunksize() - obtain chunk size + * @tfm: cipher handle + * + * The block size is set to one for ciphers such as CTR. However, + * you still need to provide incremental updates in multiples of + * the underlying block size as the IV does not have sub-block + * granularity. This is known in this API as the chunk size. + * + * Return: chunk size in bytes + */ +static inline unsigned int crypto_skcipher_chunksize( + struct crypto_skcipher *tfm) +{ + return crypto_skcipher_alg_common(tfm)->chunksize; +} + +/** + * crypto_lskcipher_chunksize() - obtain chunk size + * @tfm: cipher handle + * + * The block size is set to one for ciphers such as CTR. However, + * you still need to provide incremental updates in multiples of + * the underlying block size as the IV does not have sub-block + * granularity. This is known in this API as the chunk size. + * + * Return: chunk size in bytes + */ +static inline unsigned int crypto_lskcipher_chunksize( + struct crypto_lskcipher *tfm) +{ + return crypto_lskcipher_alg(tfm)->co.chunksize; +} + +/** + * crypto_skcipher_statesize() - obtain state size + * @tfm: cipher handle + * + * Some algorithms cannot be chained with the IV alone. They carry + * internal state which must be replicated if data is to be processed + * incrementally. The size of that state can be obtained with this + * function. + * + * Return: state size in bytes + */ +static inline unsigned int crypto_skcipher_statesize( + struct crypto_skcipher *tfm) +{ + return crypto_skcipher_alg_common(tfm)->statesize; +} + +/** + * crypto_lskcipher_statesize() - obtain state size + * @tfm: cipher handle + * + * Some algorithms cannot be chained with the IV alone. They carry + * internal state which must be replicated if data is to be processed + * incrementally. The size of that state can be obtained with this + * function. + * + * Return: state size in bytes + */ +static inline unsigned int crypto_lskcipher_statesize( + struct crypto_lskcipher *tfm) +{ + return crypto_lskcipher_alg(tfm)->co.statesize; +} -static inline void skcipher_givcrypt_set_tfm( - struct skcipher_givcrypt_request *req, struct crypto_ablkcipher *tfm) +static inline unsigned int crypto_sync_skcipher_blocksize( + struct crypto_sync_skcipher *tfm) { - req->creq.base.tfm = crypto_ablkcipher_tfm(tfm); + return crypto_skcipher_blocksize(&tfm->base); } -static inline struct skcipher_givcrypt_request *skcipher_givcrypt_cast( +static inline unsigned int crypto_skcipher_alignmask( + struct crypto_skcipher *tfm) +{ + return crypto_tfm_alg_alignmask(crypto_skcipher_tfm(tfm)); +} + +static inline unsigned int crypto_lskcipher_alignmask( + struct crypto_lskcipher *tfm) +{ + return crypto_tfm_alg_alignmask(crypto_lskcipher_tfm(tfm)); +} + +static inline u32 crypto_skcipher_get_flags(struct crypto_skcipher *tfm) +{ + return crypto_tfm_get_flags(crypto_skcipher_tfm(tfm)); +} + +static inline void crypto_skcipher_set_flags(struct crypto_skcipher *tfm, + u32 flags) +{ + crypto_tfm_set_flags(crypto_skcipher_tfm(tfm), flags); +} + +static inline void crypto_skcipher_clear_flags(struct crypto_skcipher *tfm, + u32 flags) +{ + crypto_tfm_clear_flags(crypto_skcipher_tfm(tfm), flags); +} + +static inline u32 crypto_sync_skcipher_get_flags( + struct crypto_sync_skcipher *tfm) +{ + return crypto_skcipher_get_flags(&tfm->base); +} + +static inline void crypto_sync_skcipher_set_flags( + struct crypto_sync_skcipher *tfm, u32 flags) +{ + crypto_skcipher_set_flags(&tfm->base, flags); +} + +static inline void crypto_sync_skcipher_clear_flags( + struct crypto_sync_skcipher *tfm, u32 flags) +{ + crypto_skcipher_clear_flags(&tfm->base, flags); +} + +static inline u32 crypto_lskcipher_get_flags(struct crypto_lskcipher *tfm) +{ + return crypto_tfm_get_flags(crypto_lskcipher_tfm(tfm)); +} + +static inline void crypto_lskcipher_set_flags(struct crypto_lskcipher *tfm, + u32 flags) +{ + crypto_tfm_set_flags(crypto_lskcipher_tfm(tfm), flags); +} + +static inline void crypto_lskcipher_clear_flags(struct crypto_lskcipher *tfm, + u32 flags) +{ + crypto_tfm_clear_flags(crypto_lskcipher_tfm(tfm), flags); +} + +/** + * crypto_skcipher_setkey() - set key for cipher + * @tfm: cipher handle + * @key: buffer holding the key + * @keylen: length of the key in bytes + * + * The caller provided key is set for the skcipher referenced by the cipher + * handle. + * + * Note, the key length determines the cipher type. Many block ciphers implement + * different cipher modes depending on the key size, such as AES-128 vs AES-192 + * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128 + * is performed. + * + * Return: 0 if the setting of the key was successful; < 0 if an error occurred + */ +int crypto_skcipher_setkey(struct crypto_skcipher *tfm, + const u8 *key, unsigned int keylen); + +static inline int crypto_sync_skcipher_setkey(struct crypto_sync_skcipher *tfm, + const u8 *key, unsigned int keylen) +{ + return crypto_skcipher_setkey(&tfm->base, key, keylen); +} + +/** + * crypto_lskcipher_setkey() - set key for cipher + * @tfm: cipher handle + * @key: buffer holding the key + * @keylen: length of the key in bytes + * + * The caller provided key is set for the lskcipher referenced by the cipher + * handle. + * + * Note, the key length determines the cipher type. Many block ciphers implement + * different cipher modes depending on the key size, such as AES-128 vs AES-192 + * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128 + * is performed. + * + * Return: 0 if the setting of the key was successful; < 0 if an error occurred + */ +int crypto_lskcipher_setkey(struct crypto_lskcipher *tfm, + const u8 *key, unsigned int keylen); + +static inline unsigned int crypto_skcipher_min_keysize( + struct crypto_skcipher *tfm) +{ + return crypto_skcipher_alg_common(tfm)->min_keysize; +} + +static inline unsigned int crypto_skcipher_max_keysize( + struct crypto_skcipher *tfm) +{ + return crypto_skcipher_alg_common(tfm)->max_keysize; +} + +static inline unsigned int crypto_lskcipher_min_keysize( + struct crypto_lskcipher *tfm) +{ + return crypto_lskcipher_alg(tfm)->co.min_keysize; +} + +static inline unsigned int crypto_lskcipher_max_keysize( + struct crypto_lskcipher *tfm) +{ + return crypto_lskcipher_alg(tfm)->co.max_keysize; +} + +/** + * crypto_skcipher_reqtfm() - obtain cipher handle from request + * @req: skcipher_request out of which the cipher handle is to be obtained + * + * Return the crypto_skcipher handle when furnishing an skcipher_request + * data structure. + * + * Return: crypto_skcipher handle + */ +static inline struct crypto_skcipher *crypto_skcipher_reqtfm( + struct skcipher_request *req) +{ + return __crypto_skcipher_cast(req->base.tfm); +} + +static inline struct crypto_sync_skcipher *crypto_sync_skcipher_reqtfm( + struct skcipher_request *req) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + + return container_of(tfm, struct crypto_sync_skcipher, base); +} + +/** + * crypto_skcipher_encrypt() - encrypt plaintext + * @req: reference to the skcipher_request handle that holds all information + * needed to perform the cipher operation + * + * Encrypt plaintext data using the skcipher_request handle. That data + * structure and how it is filled with data is discussed with the + * skcipher_request_* functions. + * + * Return: 0 if the cipher operation was successful; < 0 if an error occurred + */ +int crypto_skcipher_encrypt(struct skcipher_request *req); + +/** + * crypto_skcipher_decrypt() - decrypt ciphertext + * @req: reference to the skcipher_request handle that holds all information + * needed to perform the cipher operation + * + * Decrypt ciphertext data using the skcipher_request handle. That data + * structure and how it is filled with data is discussed with the + * skcipher_request_* functions. + * + * Return: 0 if the cipher operation was successful; < 0 if an error occurred + */ +int crypto_skcipher_decrypt(struct skcipher_request *req); + +/** + * crypto_skcipher_export() - export partial state + * @req: reference to the skcipher_request handle that holds all information + * needed to perform the operation + * @out: output buffer of sufficient size that can hold the state + * + * Export partial state of the transformation. This function dumps the + * entire state of the ongoing transformation into a provided block of + * data so it can be @import 'ed back later on. This is useful in case + * you want to save partial result of the transformation after + * processing certain amount of data and reload this partial result + * multiple times later on for multiple re-use. No data processing + * happens at this point. + * + * Return: 0 if the cipher operation was successful; < 0 if an error occurred + */ +int crypto_skcipher_export(struct skcipher_request *req, void *out); + +/** + * crypto_skcipher_import() - import partial state + * @req: reference to the skcipher_request handle that holds all information + * needed to perform the operation + * @in: buffer holding the state + * + * Import partial state of the transformation. This function loads the + * entire state of the ongoing transformation from a provided block of + * data so the transformation can continue from this point onward. No + * data processing happens at this point. + * + * Return: 0 if the cipher operation was successful; < 0 if an error occurred + */ +int crypto_skcipher_import(struct skcipher_request *req, const void *in); + +/** + * crypto_lskcipher_encrypt() - encrypt plaintext + * @tfm: lskcipher handle + * @src: source buffer + * @dst: destination buffer + * @len: number of bytes to process + * @siv: IV + state for the cipher operation. The length of the IV must + * comply with the IV size defined by crypto_lskcipher_ivsize. The + * IV is then followed with a buffer with the length as specified by + * crypto_lskcipher_statesize. + * Encrypt plaintext data using the lskcipher handle. + * + * Return: >=0 if the cipher operation was successful, if positive + * then this many bytes have been left unprocessed; + * < 0 if an error occurred + */ +int crypto_lskcipher_encrypt(struct crypto_lskcipher *tfm, const u8 *src, + u8 *dst, unsigned len, u8 *siv); + +/** + * crypto_lskcipher_decrypt() - decrypt ciphertext + * @tfm: lskcipher handle + * @src: source buffer + * @dst: destination buffer + * @len: number of bytes to process + * @siv: IV + state for the cipher operation. The length of the IV must + * comply with the IV size defined by crypto_lskcipher_ivsize. The + * IV is then followed with a buffer with the length as specified by + * crypto_lskcipher_statesize. + * + * Decrypt ciphertext data using the lskcipher handle. + * + * Return: >=0 if the cipher operation was successful, if positive + * then this many bytes have been left unprocessed; + * < 0 if an error occurred + */ +int crypto_lskcipher_decrypt(struct crypto_lskcipher *tfm, const u8 *src, + u8 *dst, unsigned len, u8 *siv); + +/** + * DOC: Symmetric Key Cipher Request Handle + * + * The skcipher_request data structure contains all pointers to data + * required for the symmetric key cipher operation. This includes the cipher + * handle (which can be used by multiple skcipher_request instances), pointer + * to plaintext and ciphertext, asynchronous callback function, etc. It acts + * as a handle to the skcipher_request_* API calls in a similar way as + * skcipher handle to the crypto_skcipher_* API calls. + */ + +/** + * crypto_skcipher_reqsize() - obtain size of the request data structure + * @tfm: cipher handle + * + * Return: number of bytes + */ +static inline unsigned int crypto_skcipher_reqsize(struct crypto_skcipher *tfm) +{ + return tfm->reqsize; +} + +/** + * skcipher_request_set_tfm() - update cipher handle reference in request + * @req: request handle to be modified + * @tfm: cipher handle that shall be added to the request handle + * + * Allow the caller to replace the existing skcipher handle in the request + * data structure with a different one. + */ +static inline void skcipher_request_set_tfm(struct skcipher_request *req, + struct crypto_skcipher *tfm) +{ + req->base.tfm = crypto_skcipher_tfm(tfm); +} + +static inline void skcipher_request_set_sync_tfm(struct skcipher_request *req, + struct crypto_sync_skcipher *tfm) +{ + skcipher_request_set_tfm(req, &tfm->base); +} + +static inline struct skcipher_request *skcipher_request_cast( struct crypto_async_request *req) { - return container_of(ablkcipher_request_cast(req), - struct skcipher_givcrypt_request, creq); + return container_of(req, struct skcipher_request, base); } -static inline struct skcipher_givcrypt_request *skcipher_givcrypt_alloc( - struct crypto_ablkcipher *tfm, gfp_t gfp) +/** + * skcipher_request_alloc() - allocate request data structure + * @tfm: cipher handle to be registered with the request + * @gfp: memory allocation flag that is handed to kmalloc by the API call. + * + * Allocate the request data structure that must be used with the skcipher + * encrypt and decrypt API calls. During the allocation, the provided skcipher + * handle is registered in the request data structure. + * + * Return: allocated request handle in case of success, or NULL if out of memory + */ +static inline struct skcipher_request *skcipher_request_alloc_noprof( + struct crypto_skcipher *tfm, gfp_t gfp) { - struct skcipher_givcrypt_request *req; + struct skcipher_request *req; - req = kmalloc(sizeof(struct skcipher_givcrypt_request) + - crypto_ablkcipher_reqsize(tfm), gfp); + req = kmalloc_noprof(sizeof(struct skcipher_request) + + crypto_skcipher_reqsize(tfm), gfp); if (likely(req)) - skcipher_givcrypt_set_tfm(req, tfm); + skcipher_request_set_tfm(req, tfm); return req; } +#define skcipher_request_alloc(...) alloc_hooks(skcipher_request_alloc_noprof(__VA_ARGS__)) -static inline void skcipher_givcrypt_free(struct skcipher_givcrypt_request *req) +/** + * skcipher_request_free() - zeroize and free request data structure + * @req: request data structure cipher handle to be freed + */ +static inline void skcipher_request_free(struct skcipher_request *req) { - kfree(req); + kfree_sensitive(req); } -static inline void skcipher_givcrypt_set_callback( - struct skcipher_givcrypt_request *req, u32 flags, - crypto_completion_t complete, void *data) +static inline void skcipher_request_zero(struct skcipher_request *req) { - ablkcipher_request_set_callback(&req->creq, flags, complete, data); + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + + memzero_explicit(req, sizeof(*req) + crypto_skcipher_reqsize(tfm)); } -static inline void skcipher_givcrypt_set_crypt( - struct skcipher_givcrypt_request *req, - struct scatterlist *src, struct scatterlist *dst, - unsigned int nbytes, void *iv) +/** + * skcipher_request_set_callback() - set asynchronous callback function + * @req: request handle + * @flags: specify zero or an ORing of the flags + * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and + * increase the wait queue beyond the initial maximum size; + * CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep + * @compl: callback function pointer to be registered with the request handle + * @data: The data pointer refers to memory that is not used by the kernel + * crypto API, but provided to the callback function for it to use. Here, + * the caller can provide a reference to memory the callback function can + * operate on. As the callback function is invoked asynchronously to the + * related functionality, it may need to access data structures of the + * related functionality which can be referenced using this pointer. The + * callback function can access the memory via the "data" field in the + * crypto_async_request data structure provided to the callback function. + * + * This function allows setting the callback function that is triggered once the + * cipher operation completes. + * + * The callback function is registered with the skcipher_request handle and + * must comply with the following template:: + * + * void callback_function(struct crypto_async_request *req, int error) + */ +static inline void skcipher_request_set_callback(struct skcipher_request *req, + u32 flags, + crypto_completion_t compl, + void *data) { - ablkcipher_request_set_crypt(&req->creq, src, dst, nbytes, iv); + req->base.complete = compl; + req->base.data = data; + req->base.flags = flags; } -static inline void skcipher_givcrypt_set_giv( - struct skcipher_givcrypt_request *req, u8 *giv, u64 seq) +/** + * skcipher_request_set_crypt() - set data buffers + * @req: request handle + * @src: source scatter / gather list + * @dst: destination scatter / gather list + * @cryptlen: number of bytes to process from @src + * @iv: IV for the cipher operation which must comply with the IV size defined + * by crypto_skcipher_ivsize + * + * This function allows setting of the source data and destination data + * scatter / gather lists. + * + * For encryption, the source is treated as the plaintext and the + * destination is the ciphertext. For a decryption operation, the use is + * reversed - the source is the ciphertext and the destination is the plaintext. + */ +static inline void skcipher_request_set_crypt( + struct skcipher_request *req, + struct scatterlist *src, struct scatterlist *dst, + unsigned int cryptlen, void *iv) { - req->giv = giv; - req->seq = seq; + req->src = src; + req->dst = dst; + req->cryptlen = cryptlen; + req->iv = iv; } #endif /* _CRYPTO_SKCIPHER_H */ |