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ICP: gcm: Allocate hash subkey table separately

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While evaluating other assembler implementations it turns out that
the precomputed hash subkey tables vary in size, from 8*16 bytes
(avx2/avx512) up to 48*16 bytes (avx512-vaes), depending on the
implementation.

To be able to handle the size differences later, allocate
`gcm_Htable` dynamically rather then having a fixed size array, and
adapt consumers.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Attila Fülöp <attila@fueloep.org>
Closes #11102
This commit is contained in:
Attila Fülöp
2020-10-30 23:24:21 +01:00
committed by GitHub
parent d9655c5b37
commit e8beeaa111
5 changed files with 93 additions and 13 deletions
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module/icp/include/modes/modes.h
+4 -4
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@@ -219,14 +219,14 @@ typedef struct gcm_ctx {
size_t gcm_pt_buf_len;
uint32_t gcm_tmp[4];
/*
* The relative positions of gcm_ghash, gcm_H and pre-computed
* gcm_Htable are hard coded in aesni-gcm-x86_64.S and ghash-x86_64.S,
* so please don't change (or adjust accordingly).
* The offset of gcm_Htable relative to gcm_ghash, (32), is hard coded
* in aesni-gcm-x86_64.S, so please don't change (or adjust there).
*/
uint64_t gcm_ghash[2];
uint64_t gcm_H[2];
#ifdef CAN_USE_GCM_ASM
uint64_t gcm_Htable[12][2];
uint64_t *gcm_Htable;
size_t gcm_htab_len;
#endif
uint64_t gcm_J0[2];
uint64_t gcm_len_a_len_c[2];