1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 #ifndef HASH_ALGS_H 3 #define HASH_ALGS_H 4 5 #include <stdio.h> 6 7 #include "util.h" 8 9 struct fsverity_hash_alg { 10 const char *name; 11 unsigned int digest_size; 12 bool cryptographic; 13 struct hash_ctx *(*create_ctx)(const struct fsverity_hash_alg *alg); 14 }; 15 16 extern const struct fsverity_hash_alg fsverity_hash_algs[]; 17 18 struct hash_ctx { 19 const struct fsverity_hash_alg *alg; 20 void (*init)(struct hash_ctx *ctx); 21 void (*update)(struct hash_ctx *ctx, const void *data, size_t size); 22 void (*final)(struct hash_ctx *ctx, u8 *out); 23 void (*free)(struct hash_ctx *ctx); 24 }; 25 26 const struct fsverity_hash_alg *find_hash_alg_by_name(const char *name); 27 const struct fsverity_hash_alg *find_hash_alg_by_num(unsigned int num); 28 void show_all_hash_algs(FILE *fp); 29 #define DEFAULT_HASH_ALG (&fsverity_hash_algs[FS_VERITY_ALG_SHA256]) 30 31 /* 32 * Largest digest size among all hash algorithms supported by fs-verity. 33 * This can be increased if needed. 34 */ 35 #define FS_VERITY_MAX_DIGEST_SIZE 64 36 37 static inline struct hash_ctx *hash_create(const struct fsverity_hash_alg *alg) 38 { 39 return alg->create_ctx(alg); 40 } 41 42 static inline void hash_init(struct hash_ctx *ctx) 43 { 44 ctx->init(ctx); 45 } 46 47 static inline void hash_update(struct hash_ctx *ctx, 48 const void *data, size_t size) 49 { 50 ctx->update(ctx, data, size); 51 } 52 53 static inline void hash_final(struct hash_ctx *ctx, u8 *digest) 54 { 55 ctx->final(ctx, digest); 56 } 57 58 static inline void hash_free(struct hash_ctx *ctx) 59 { 60 if (ctx) 61 ctx->free(ctx); 62 } 63 64 #endif /* HASH_ALGS_H */ 65
