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caam-blob.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2020 Pengutronix, Ahmad Fatoum <kernel@pengutronix.de> */ #ifndef __CAAM_BLOB_GEN #define __CAAM_BLOB_GEN #include <linux/types.h> #include <linux/errno.h> #define CAAM_BLOB_KEYMOD_LENGTH 16 #define CAAM_BLOB_OVERHEAD (32 + 16) #define CAAM_BLOB_MAX_LEN 4096 struct caam_blob_priv; /** * struct caam_blob_info - information for CAAM blobbing * @input: pointer to input buffer (must be DMAable) * @input_len: length of @input buffer in bytes. * @output: pointer to output buffer (must be DMAable) * @output_len: length of @output buffer in bytes. * @key_mod: key modifier * @key_mod_len: length of @key_mod in bytes. * May not exceed %CAAM_BLOB_KEYMOD_LENGTH */ struct caam_blob_info { void *input; size_t input_len; void *output; size_t output_len; const void *key_mod; size_t key_mod_len; }; /** * caam_blob_gen_init - initialize blob generation * Return: pointer to new &struct caam_blob_priv instance on success * and ``ERR_PTR(-ENODEV)`` if CAAM has no hardware blobbing support * or no job ring could be allocated. */ struct caam_blob_priv *caam_blob_gen_init(void); /** * caam_blob_gen_exit - free blob generation resources * @priv: instance returned by caam_blob_gen_init() */ void caam_blob_gen_exit(struct caam_blob_priv *priv); /** * caam_process_blob - encapsulate or decapsulate blob * @priv: instance returned by caam_blob_gen_init() * @info: pointer to blobbing info describing key, blob and * key modifier buffers. * @encap: true for encapsulation, false for decapsulation * * Return: %0 and sets ``info->output_len`` on success and a negative * error code otherwise. */ int caam_process_blob(struct caam_blob_priv *priv, struct caam_blob_info *info, bool encap); /** * caam_encap_blob - encapsulate blob * @priv: instance returned by caam_blob_gen_init() * @info: pointer to blobbing info describing input key, * output blob and key modifier buffers. * * Return: %0 and sets ``info->output_len`` on success and * a negative error code otherwise. */ static inline int caam_encap_blob(struct caam_blob_priv *priv, struct caam_blob_info *info) { if (info->output_len < info->input_len + CAAM_BLOB_OVERHEAD) return -EINVAL; return caam_process_blob(priv, info, true); } /** * caam_decap_blob - decapsulate blob * @priv: instance returned by caam_blob_gen_init() * @info: pointer to blobbing info describing output key, * input blob and key modifier buffers. * * Return: %0 and sets ``info->output_len`` on success and * a negative error code otherwise. */ static inline int caam_decap_blob(struct caam_blob_priv *priv, struct caam_blob_info *info) { if (info->input_len < CAAM_BLOB_OVERHEAD || info->output_len < info->input_len - CAAM_BLOB_OVERHEAD) return -EINVAL; return caam_process_blob(priv, info, false); } #endif
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