51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/// @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 "utils_hash.h"
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#include "rainbow_config.h"
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#include "sha2.h"
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static inline int h(unsigned char *digest, const unsigned char *m, size_t mlen) {
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sha256(digest, m, mlen);
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return 0;
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}
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static inline int expand_hash(unsigned char *digest, size_t n_digest, const unsigned char *hash) {
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if (_HASH_LEN >= n_digest) {
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for (size_t 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 (size_t 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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h(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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h(temp, digest, _HASH_LEN);
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for (size_t 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_RAINBOWICLASSIC_CLEAN_hash_msg(unsigned char *digest,
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size_t len_digest,
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const unsigned char *m,
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size_t mlen) {
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unsigned char buf[_HASH_LEN];
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h(buf, m, mlen);
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return expand_hash(digest, len_digest, buf);
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}
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