66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
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/// @file utils_hash.c
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/// @brief the adapter for SHA2 families.
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///
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///
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#include "hash_len_config.h"
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#include "sha2.h"
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#include "utils_hash.h"
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#ifndef _HASH_LEN
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#define _HASH_LEN (32)
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#endif
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static inline
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int _hash( unsigned char *digest, const unsigned char *m, unsigned long long mlen ) {
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#if 32 == _HASH_LEN
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sha256(digest, m, mlen);
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#elif 48 == _HASH_LEN
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sha384(digest, m, mlen);
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#elif 64 == _HASH_LEN
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sha512(digest, m, mlen);
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#else
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#error "unsupported _HASH_LEN"
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#endif
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return 0;
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}
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static inline
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int expand_hash( unsigned char *digest, unsigned n_digest, const unsigned char *hash ) {
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if ( _HASH_LEN >= n_digest ) {
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for (unsigned i = 0; i < n_digest; i++) {
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digest[i] = hash[i];
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}
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return 0;
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}
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for (unsigned i = 0; i < _HASH_LEN; i++) {
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digest[i] = hash[i];
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}
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n_digest -= _HASH_LEN;
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while ( _HASH_LEN <= n_digest ) {
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_hash( digest + _HASH_LEN, digest, _HASH_LEN );
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n_digest -= _HASH_LEN;
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digest += _HASH_LEN;
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}
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unsigned char temp[_HASH_LEN];
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if ( n_digest ) {
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_hash( temp, digest, _HASH_LEN );
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for (unsigned i = 0; i < n_digest; i++) {
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digest[_HASH_LEN + i] = temp[i];
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}
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}
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return 0;
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}
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int PQCLEAN_RAINBOWIACLASSIC_CLEAN_hash_msg( unsigned char *digest, unsigned len_digest, const unsigned char *m, unsigned long long mlen ) {
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unsigned char buf[_HASH_LEN];
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_hash( buf, m, mlen );
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return expand_hash( digest, len_digest, buf );
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}
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