68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/***
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* Some helpers in identifying hashes
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*/
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#include <stdlib.h>
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#include "mh/hashes.h"
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#include "mh/errors.h"
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#include "mh/generic.h"
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static const struct hash_info {
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int hash;
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const char *name;
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int length;
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} hash_infos[] = {
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{ MH_H_SHA1, "sha1", 20},
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{ MH_H_SHA2_256, "sha2-256", 32 },
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{ MH_H_SHA2_512, "sha2-512", 64 },
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{ MH_H_SHA3_512, "sha3-512", 64 },
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{ MH_H_SHA3_384, "sha3-384", 45 },
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{ MH_H_SHA3_256, "sha3-256", 32 },
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{ MH_H_SHA3_224, "sha3-224", 28 },
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{ MH_H_SHAKE_128, "shake-128", 16 },
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{ MH_H_SHAKE_256, "shake-256", 32 },
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{ MH_H_BLAKE2B, "blake2b", 64 },
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{ MH_H_BLAKE2S, "blake2s", 32 }
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};
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mh_assert_static(sizeof(hash_infos) / sizeof(hash_infos[0]) == MH_H_COUNT);
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/**
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* Given the id, return a struct that shows the id, name, and default length
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* @param hash the id, such as MH_H_SHA1
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* @returns a hash_info struct that has an int, const char* and int
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*/
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static const struct hash_info *find_hash(int hash) {
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// naive search, could be replaced with binary
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unsigned int i = 0;
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for (; i < MH_H_COUNT; i++) {
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if (hash_infos[i].hash == hash)
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return &hash_infos[i];
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}
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return NULL;
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}
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/**
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* Given the id, return the hash name
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* @param hash the id (such as MH_H_SHA1)
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* @returns the name as text, such as "sha1"
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*/
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const char *mh_hash_name(int hash) {
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const struct hash_info *info = find_hash(hash);
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return (info != NULL) ? info->name : NULL;
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}
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/**
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* Given the id, return the default length
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* @param hash the id
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* @returns the default length of that hash
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*/
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int mh_hash_default_length(int hash) {
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const struct hash_info *info = find_hash(hash);
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return (info != NULL) ? info->length : MH_E_UNKNOWN_CODE;
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}
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