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crypto: Add aesdec_IMC

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Add a primitive for InvMixColumns.

Acked-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-06-02 02:01:23 -07:00
parent 04e1f30eed
commit 5b41deb310
3 changed files with 79 additions and 0 deletions
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59
crypto/aes.c
View file

@ -1322,6 +1322,65 @@ void aesenc_SB_SR_AK_genrev(AESState *r, const AESState *s, const AESState *k)
aesenc_SB_SR_AK_swap(r, s, k, true);
}
/*
* Perform InvMixColumns.
*/
static inline void
aesdec_IMC_swap(AESState *r, const AESState *st, bool swap)
{
int swap_b = swap * 0xf;
int swap_w = swap * 0x3;
bool be = HOST_BIG_ENDIAN ^ swap;
uint32_t t;
/* Note that AES_imc is encoded for big-endian. */
t = (AES_imc[st->b[swap_b ^ 0x0]][0] ^
AES_imc[st->b[swap_b ^ 0x1]][1] ^
AES_imc[st->b[swap_b ^ 0x2]][2] ^
AES_imc[st->b[swap_b ^ 0x3]][3]);
if (!be) {
t = bswap32(t);
}
r->w[swap_w ^ 0] = t;
t = (AES_imc[st->b[swap_b ^ 0x4]][0] ^
AES_imc[st->b[swap_b ^ 0x5]][1] ^
AES_imc[st->b[swap_b ^ 0x6]][2] ^
AES_imc[st->b[swap_b ^ 0x7]][3]);
if (!be) {
t = bswap32(t);
}
r->w[swap_w ^ 1] = t;
t = (AES_imc[st->b[swap_b ^ 0x8]][0] ^
AES_imc[st->b[swap_b ^ 0x9]][1] ^
AES_imc[st->b[swap_b ^ 0xA]][2] ^
AES_imc[st->b[swap_b ^ 0xB]][3]);
if (!be) {
t = bswap32(t);
}
r->w[swap_w ^ 2] = t;
t = (AES_imc[st->b[swap_b ^ 0xC]][0] ^
AES_imc[st->b[swap_b ^ 0xD]][1] ^
AES_imc[st->b[swap_b ^ 0xE]][2] ^
AES_imc[st->b[swap_b ^ 0xF]][3]);
if (!be) {
t = bswap32(t);
}
r->w[swap_w ^ 3] = t;
}
void aesdec_IMC_gen(AESState *r, const AESState *st)
{
aesdec_IMC_swap(r, st, false);
}
void aesdec_IMC_genrev(AESState *r, const AESState *st)
{
aesdec_IMC_swap(r, st, true);
}
/*
* Perform InvSubBytes + InvShiftRows + AddRoundKey.
*/

2
host/include/generic/host/crypto/aes-round.h
View file

@ -15,6 +15,8 @@ void aesenc_SB_SR_AK_accel(AESState *, const AESState *,
const AESState *, bool)
QEMU_ERROR("unsupported accel");
void aesdec_IMC_accel(AESState *, const AESState *, bool)
QEMU_ERROR("unsupported accel");
void aesdec_ISB_ISR_AK_accel(AESState *, const AESState *,
const AESState *, bool)
QEMU_ERROR("unsupported accel");

18
include/crypto/aes-round.h
View file

@ -59,6 +59,24 @@ static inline void aesenc_SB_SR_AK(AESState *r, const AESState *st,
}
}
/*
* Perform InvMixColumns.
*/
void aesdec_IMC_gen(AESState *ret, const AESState *st);
void aesdec_IMC_genrev(AESState *ret, const AESState *st);
static inline void aesdec_IMC(AESState *r, const AESState *st, bool be)
{
if (HAVE_AES_ACCEL) {
aesdec_IMC_accel(r, st, be);
} else if (HOST_BIG_ENDIAN == be) {
aesdec_IMC_gen(r, st);
} else {
aesdec_IMC_genrev(r, st);
}
}
/*
* Perform InvSubBytes + InvShiftRows + AddRoundKey.
*/