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crypto/aes: Add AES_SH, AES_ISH macros

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These macros will constant fold and avoid the indirection through
memory when fully unrolling some new primitives.

Acked-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-06-01 16:05:29 -07:00
parent fb250c59aa
commit e20e14d2b1
1 changed files with 14 additions and 2 deletions
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16
crypto/aes.c
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@ -108,12 +108,24 @@ const uint8_t AES_isbox[256] = {
0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D,
}; };
/* AES ShiftRows, for complete unrolling. */
#define AES_SH(X) (((X) * 5) & 15)
const uint8_t AES_shifts[16] = { const uint8_t AES_shifts[16] = {
0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, 1, 6, 11 AES_SH(0x0), AES_SH(0x1), AES_SH(0x2), AES_SH(0x3),
AES_SH(0x4), AES_SH(0x5), AES_SH(0x6), AES_SH(0x7),
AES_SH(0x8), AES_SH(0x9), AES_SH(0xA), AES_SH(0xB),
AES_SH(0xC), AES_SH(0xD), AES_SH(0xE), AES_SH(0xF),
}; };
/* AES InvShiftRows, for complete unrolling. */
#define AES_ISH(X) (((X) * 13) & 15)
const uint8_t AES_ishifts[16] = { const uint8_t AES_ishifts[16] = {
0, 13, 10, 7, 4, 1, 14, 11, 8, 5, 2, 15, 12, 9, 6, 3 AES_ISH(0x0), AES_ISH(0x1), AES_ISH(0x2), AES_ISH(0x3),
AES_ISH(0x4), AES_ISH(0x5), AES_ISH(0x6), AES_ISH(0x7),
AES_ISH(0x8), AES_ISH(0x9), AES_ISH(0xA), AES_ISH(0xB),
AES_ISH(0xC), AES_ISH(0xD), AES_ISH(0xE), AES_ISH(0xF),
}; };
/* /*