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Diffstat (limited to '')
| -rw-r--r-- | include/crypto/akcipher.h | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/include/crypto/akcipher.h b/include/crypto/akcipher.h new file mode 100644 index 000000000..5764b46bd --- /dev/null +++ b/include/crypto/akcipher.h @@ -0,0 +1,418 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Public Key Encryption + * + * Copyright (c) 2015, Intel Corporation + * Authors: Tadeusz Struk <tadeusz.struk@intel.com> + */ +#ifndef _CRYPTO_AKCIPHER_H +#define _CRYPTO_AKCIPHER_H +#include <linux/crypto.h> + +/** + * struct akcipher_request - public key request + * + * @base: Common attributes for async crypto requests + * @src: Source data + * For verify op this is signature + digest, in that case + * total size of @src is @src_len + @dst_len. + * @dst: Destination data (Should be NULL for verify op) + * @src_len: Size of the input buffer + * For verify op it's size of signature part of @src, this part + * is supposed to be operated by cipher. + * @dst_len: Size of @dst buffer (for all ops except verify). + * It needs to be at least as big as the expected result + * depending on the operation. + * After operation it will be updated with the actual size of the + * result. + * In case of error where the dst sgl size was insufficient, + * it will be updated to the size required for the operation. + * For verify op this is size of digest part in @src. + * @__ctx: Start of private context data + */ +struct akcipher_request { + struct crypto_async_request base; + struct scatterlist *src; + struct scatterlist *dst; + unsigned int src_len; + unsigned int dst_len; + void *__ctx[] CRYPTO_MINALIGN_ATTR; +}; + +/** + * struct crypto_akcipher - user-instantiated objects which encapsulate + * algorithms and core processing logic + * + * @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 complete verify operation as defined by + * public key algorithm, returning verification status. Requires + * digest value as input parameter. + * @encrypt: Function performs an encrypt operation as defined by public key + * algorithm. In case of error, where the dst_len was insufficient, + * the req->dst_len will be updated to the size required for the + * operation + * @decrypt: Function performs a decrypt operation as defined by public key + * algorithm. In case of error, where the dst_len was insufficient, + * the req->dst_len will be updated to the size required for the + * operation + * @set_pub_key: Function invokes the algorithm specific set public key + * function, which knows how to decode and interpret + * the BER encoded public key and parameters + * @set_priv_key: Function invokes the algorithm specific set private key + * function, which knows how to decode and interpret + * the BER encoded private key and parameters + * @max_size: Function returns dest buffer size required for a given key. + * @init: Initialize the cryptographic transformation object. + * This function is used to initialize the cryptographic + * transformation object. This function is called only once at + * the instantiation time, right after the transformation context + * was allocated. In case the cryptographic hardware has some + * special requirements which need to be handled by software, this + * function shall check for the precise requirement of the + * transformation and put any software fallbacks in place. + * @exit: Deinitialize the cryptographic transformation object. This is a + * counterpart to @init, used to remove various changes set in + * @init. + * + * @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); + unsigned 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 crypto_tfm *tfm) +{ + return container_of(tfm, struct crypto_akcipher, base); +} + +static inline struct akcipher_alg *crypto_akcipher_alg( + struct crypto_akcipher *tfm) +{ + return __crypto_akcipher_alg(crypto_akcipher_tfm(tfm)->__crt_alg); +} + +static inline unsigned int crypto_akcipher_reqsize(struct crypto_akcipher *tfm) +{ + return crypto_akcipher_alg(tfm)->reqsize; +} + +static inline void akcipher_request_set_tfm(struct akcipher_request *req, + struct crypto_akcipher *tfm) +{ + req->base.tfm = crypto_akcipher_tfm(tfm); +} + +static inline struct crypto_akcipher *crypto_akcipher_reqtfm( + struct akcipher_request *req) +{ + return __crypto_akcipher_tfm(req->base.tfm); +} + +/** + * crypto_free_akcipher() - free AKCIPHER tfm handle + * + * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher() + * + * If @tfm is a NULL or error pointer, this function does nothing. + */ +static inline void crypto_free_akcipher(struct crypto_akcipher *tfm) +{ + crypto_destroy_tfm(tfm, crypto_akcipher_tfm(tfm)); +} + +/** + * akcipher_request_alloc() - allocates public key request + * + * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher() + * @gfp: allocation flags + * + * Return: allocated handle in case of success or NULL in case of an error. + */ +static inline struct akcipher_request *akcipher_request_alloc( + struct crypto_akcipher *tfm, gfp_t gfp) +{ + struct akcipher_request *req; + + req = kmalloc(sizeof(*req) + crypto_akcipher_reqsize(tfm), gfp); + if (likely(req)) + akcipher_request_set_tfm(req, tfm); + + return req; +} + +/** + * akcipher_request_free() - zeroize and free public key request + * + * @req: request to free + */ +static inline void akcipher_request_free(struct akcipher_request *req) +{ + kfree_sensitive(req); +} + +/** + * akcipher_request_set_callback() - Sets an asynchronous callback. + * + * Callback will be called when an asynchronous operation on a given + * request is finished. + * + * @req: request that the callback will be set for + * @flgs: specify for instance if the operation may backlog + * @cmpl: callback which will be called + * @data: private data used by the caller + */ +static inline void akcipher_request_set_callback(struct akcipher_request *req, + u32 flgs, + crypto_completion_t cmpl, + void *data) +{ + req->base.complete = cmpl; + req->base.data = data; + req->base.flags = flgs; +} + +/** + * akcipher_request_set_crypt() - Sets request parameters + * + * Sets parameters required by crypto operation + * + * @req: public key request + * @src: ptr to input scatter list + * @dst: ptr to output scatter list or NULL for verify op + * @src_len: size of the src input scatter list to be processed + * @dst_len: size of the dst output scatter list or size of signature + * portion in @src for verify op + */ +static inline void akcipher_request_set_crypt(struct akcipher_request *req, + struct scatterlist *src, + struct scatterlist *dst, + unsigned int src_len, + unsigned int dst_len) +{ + req->src = src; + req->dst = dst; + req->src_len = src_len; + req->dst_len = dst_len; +} + +/** + * crypto_akcipher_maxsize() - Get len for output buffer + * + * Function returns the dest buffer size required for a given key. + * Function assumes that the key is already set in the transformation. If this + * function is called without a setkey or with a failed setkey, you will end up + * in a NULL dereference. + * + * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher() + */ +static inline unsigned int crypto_akcipher_maxsize(struct crypto_akcipher *tfm) +{ + struct akcipher_alg *alg = crypto_akcipher_alg(tfm); + + return alg->max_size(tfm); +} + +/** + * crypto_akcipher_encrypt() - Invoke public key encrypt operation + * + * Function invokes the specific public key encrypt operation for a given + * public key algorithm + * + * @req: asymmetric key request + * + * Return: zero on success; error code in case of error + */ +static inline int crypto_akcipher_encrypt(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct akcipher_alg *alg = crypto_akcipher_alg(tfm); + struct crypto_alg *calg = tfm->base.__crt_alg; + unsigned int src_len = req->src_len; + int ret; + + crypto_stats_get(calg); + ret = alg->encrypt(req); + crypto_stats_akcipher_encrypt(src_len, ret, calg); + return ret; +} + +/** + * crypto_akcipher_decrypt() - Invoke public key decrypt operation + * + * Function invokes the specific public key decrypt operation for a given + * public key algorithm + * + * @req: asymmetric key request + * + * Return: zero on success; error code in case of error + */ +static inline int crypto_akcipher_decrypt(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct akcipher_alg *alg = crypto_akcipher_alg(tfm); + struct crypto_alg *calg = tfm->base.__crt_alg; + unsigned int src_len = req->src_len; + int ret; + + crypto_stats_get(calg); + ret = alg->decrypt(req); + crypto_stats_akcipher_decrypt(src_len, ret, calg); + return ret; +} + +/** + * crypto_akcipher_sign() - Invoke public key sign operation + * + * Function invokes the specific public key sign operation for a given + * public key algorithm + * + * @req: asymmetric key request + * + * Return: zero on success; error code in case of error + */ +static inline int crypto_akcipher_sign(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct akcipher_alg *alg = crypto_akcipher_alg(tfm); + struct crypto_alg *calg = tfm->base.__crt_alg; + int ret; + + crypto_stats_get(calg); + ret = alg->sign(req); + crypto_stats_akcipher_sign(ret, calg); + return ret; +} + +/** + * crypto_akcipher_verify() - Invoke public key signature verification + * + * Function invokes the specific public key signature verification operation + * for a given public key algorithm. + * + * @req: asymmetric key request + * + * Note: req->dst should be NULL, req->src should point to SG of size + * (req->src_size + req->dst_size), containing signature (of req->src_size + * length) with appended digest (of req->dst_size length). + * + * Return: zero on verification success; error code in case of error. + */ +static inline int crypto_akcipher_verify(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct akcipher_alg *alg = crypto_akcipher_alg(tfm); + struct crypto_alg *calg = tfm->base.__crt_alg; + int ret; + + crypto_stats_get(calg); + ret = alg->verify(req); + crypto_stats_akcipher_verify(ret, calg); + return ret; +} + +/** + * crypto_akcipher_set_pub_key() - Invoke set public key operation + * + * Function invokes the algorithm specific set key function, which knows + * how to decode and interpret the encoded key and parameters + * + * @tfm: tfm handle + * @key: BER encoded public key, algo OID, paramlen, BER encoded + * parameters + * @keylen: length of the key (not including other data) + * + * Return: zero on success; error code in case of error + */ +static inline int crypto_akcipher_set_pub_key(struct crypto_akcipher *tfm, + const void *key, + unsigned int keylen) +{ + struct akcipher_alg *alg = crypto_akcipher_alg(tfm); + + return alg->set_pub_key(tfm, key, keylen); +} + +/** + * crypto_akcipher_set_priv_key() - Invoke set private key operation + * + * Function invokes the algorithm specific set key function, which knows + * how to decode and interpret the encoded key and parameters + * + * @tfm: tfm handle + * @key: BER encoded private key, algo OID, paramlen, BER encoded + * parameters + * @keylen: length of the key (not including other data) + * + * Return: zero on success; error code in case of error + */ +static inline int crypto_akcipher_set_priv_key(struct crypto_akcipher *tfm, + const void *key, + unsigned int keylen) +{ + struct akcipher_alg *alg = crypto_akcipher_alg(tfm); + + return alg->set_priv_key(tfm, key, keylen); +} +#endif |