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Introduce the concept of "domain" for SHAKE XOF.

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Marek Knápek 2025-11-27 14:28:00 +01:00
parent 4db24a7d08
commit d31ca86251
1 changed files with 5 additions and 5 deletions
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10
src/hashes/sha3.c
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@ -353,19 +353,19 @@ int keccak_done(hash_state *md, unsigned char *out)
#endif
#ifdef LTC_SHA3
static LTC_INLINE int s_sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen, process_fn proc_f)
static LTC_INLINE int s_sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen, unsigned char domain, process_fn proc_f)
{
/* IMPORTANT NOTE: sha3_shake_done can be called many times */
unsigned long idx;
unsigned i;
if (outlen == 0) return CRYPT_OK; /* nothing to do */
LTC_ARGCHK(md != NULL);
LTC_ARGCHK(md != NULL);
LTC_ARGCHK(out != NULL);
if (!md->sha3.xof_flag) {
/* shake_xof operation must be done only once */
md->sha3.s[md->sha3.word_index] ^= (md->sha3.saved ^ (CONST64(0x1F) << (md->sha3.byte_index * 8)));
md->sha3.s[md->sha3.word_index] ^= (md->sha3.saved ^ (((ulong64)(domain)) << (md->sha3.byte_index * 8)));
md->sha3.s[SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words - 1] ^= CONST64(0x8000000000000000);
proc_f(md->sha3.s);
/* store sha3.s[] as little-endian bytes into sha3.sb */
@ -392,13 +392,13 @@ static LTC_INLINE int s_sha3_shake_done(hash_state *md, unsigned char *out, unsi
int sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen)
{
return s_sha3_shake_done(md, out, outlen, s_keccakf);
return s_sha3_shake_done(md, out, outlen, 0x1f, s_keccakf);
}
#if defined LTC_TURBO_SHAKE
int turbo_shake_done(hash_state *md, unsigned char *out, unsigned long outlen)
{
return s_sha3_shake_done(md, out, outlen, s_keccak_turbo_f);
return s_sha3_shake_done(md, out, outlen, 0x1f, s_keccak_turbo_f);
}
#endif