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/* SPDX-License-Identifier: MIT */
/*
* Private header for libfsverity
*
* Copyright 2020 Google LLC
*
* Use of this source code is governed by an MIT-style
* license that can be found in the LICENSE file or at
* https://opensource.org/licenses/MIT.
*/
#ifndef LIB_LIB_PRIVATE_H
#define LIB_LIB_PRIVATE_H
#include "libfsverity.h"
#include "../common/common_defs.h"
#include "../common/fsverity_uapi.h"
#include <stdarg.h>
#define LIBEXPORT __attribute__((visibility("default")))
/* The hash algorithm that libfsverity assumes when none is specified */
#define FS_VERITY_HASH_ALG_DEFAULT FS_VERITY_HASH_ALG_SHA256
/* The block size that libfsverity assumes when none is specified */
#define FS_VERITY_BLOCK_SIZE_DEFAULT 4096
/* hash_algs.c */
struct fsverity_hash_alg {
const char *name;
unsigned int digest_size;
unsigned int block_size;
struct hash_ctx *(*create_ctx)(const struct fsverity_hash_alg *alg);
};
const struct fsverity_hash_alg *libfsverity_find_hash_alg_by_num(u32 alg_num);
struct hash_ctx {
const struct fsverity_hash_alg *alg;
void (*init)(struct hash_ctx *ctx);
void (*update)(struct hash_ctx *ctx, const void *data, size_t size);
void (*final)(struct hash_ctx *ctx, u8 *out);
void (*free)(struct hash_ctx *ctx);
};
void libfsverity_hash_init(struct hash_ctx *ctx);
void libfsverity_hash_update(struct hash_ctx *ctx, const void *data,
size_t size);
void libfsverity_hash_final(struct hash_ctx *ctx, u8 *digest);
void libfsverity_hash_full(struct hash_ctx *ctx, const void *data, size_t size,
u8 *digest);
void libfsverity_free_hash_ctx(struct hash_ctx *ctx);
/* utils.c */
void *libfsverity_zalloc(size_t size);
void *libfsverity_memdup(const void *mem, size_t size);
__cold void
libfsverity_do_error_msg(const char *format, va_list va, int err);
__printf(1, 2) __cold void
libfsverity_error_msg(const char *format, ...);
__printf(1, 2) __cold void
libfsverity_error_msg_errno(const char *format, ...);
__cold void
libfsverity_warn_on(const char *condition, const char *file, int line);
#define WARN_ON(condition) \
({ \
bool c = (condition); \
\
if (c) \
libfsverity_warn_on(#condition, __FILE__, __LINE__); \
c; \
})
__cold void
libfsverity_bug_on(const char *condition, const char *file, int line);
#define BUG_ON(condition) \
({ \
bool c = (condition); \
\
if (c) \
libfsverity_bug_on(#condition, __FILE__, __LINE__); \
c; \
})
bool libfsverity_mem_is_zeroed(const void *mem, size_t size);
#endif /* LIB_LIB_PRIVATE_H */
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