51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
#ifndef MH_HULTIHASH_H
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#define MH_HULTIHASH_H
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#include <stddef.h>
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/**
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* returns hash code or error (which is < 0)
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* @param mh the multihash
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* @param len the length of the multihash
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* @returns errors ( < 0 ) or the multihash
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*/
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int mh_multihash_hash(const unsigned char *multihash, size_t len);
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/***
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* returns the length of the multihash's data section
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* @param mh the multihash
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* @param len the length of the multihash
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* @returns the length of the data section, or an error if < 0
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*/
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int mh_multihash_length(const unsigned char *multihash, size_t len);
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/**
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* gives access to raw digest inside multihash buffer
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* @param multihash the multihash
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* @param len the length
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* @param digest the results
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* @returns error if less than zero, otherwise 0
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*/
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int mh_multihash_digest(const unsigned char *multihash, size_t len,
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unsigned char **digest, size_t *digest_len);
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/**
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* determine the size of the multihash given the data size
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* @param code currently not used
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* @param hash_len the data size
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* @returns hash_len + 2 (until the code parameter (varint) is added
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*/
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int mh_new_length(int code, size_t digest_len);
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/***
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* create a multihash based on some data
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* @param buffer where to put the multihash
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* @param code the code
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* @param digest the data within the multihash
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* @returns error (if < 0) or 0
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*/
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int mh_new(unsigned char* buffer, int code, const unsigned char *digest,
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size_t digest_len);
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#endif /* end of include guard */
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