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+/* 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