/* SPDX-License-Identifier: GPL-2.0+ */
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#ifndef HASH_ALGS_H
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#define HASH_ALGS_H
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#include <stdio.h>
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#include "util.h"
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struct fsverity_hash_alg {
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const char *name;
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unsigned int digest_size;
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bool cryptographic;
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struct hash_ctx *(*create_ctx)(const struct fsverity_hash_alg *alg);
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};
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extern const struct fsverity_hash_alg fsverity_hash_algs[];
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struct hash_ctx {
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const struct fsverity_hash_alg *alg;
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void (*init)(struct hash_ctx *ctx);
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void (*update)(struct hash_ctx *ctx, const void *data, size_t size);
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void (*final)(struct hash_ctx *ctx, u8 *out);
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void (*free)(struct hash_ctx *ctx);
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};
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const struct fsverity_hash_alg *find_hash_alg_by_name(const char *name);
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const struct fsverity_hash_alg *find_hash_alg_by_num(unsigned int num);
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void show_all_hash_algs(FILE *fp);
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#define DEFAULT_HASH_ALG (&fsverity_hash_algs[FS_VERITY_ALG_SHA256])
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/*
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* Largest digest size among all hash algorithms supported by fs-verity.
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* This can be increased if needed.
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*/
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#define FS_VERITY_MAX_DIGEST_SIZE 64
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static inline struct hash_ctx *hash_create(const struct fsverity_hash_alg *alg)
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{
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return alg->create_ctx(alg);
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}
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static inline void hash_init(struct hash_ctx *ctx)
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{
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ctx->init(ctx);
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}
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static inline void hash_update(struct hash_ctx *ctx,
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const void *data, size_t size)
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{
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ctx->update(ctx, data, size);
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}
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static inline void hash_final(struct hash_ctx *ctx, u8 *digest)
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{
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ctx->final(ctx, digest);
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}
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static inline void hash_free(struct hash_ctx *ctx)
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{
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if (ctx)
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ctx->free(ctx);
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}
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#endif /* HASH_ALGS_H */
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