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crypto: Add aesdec_ISB_ISR_IMC_AK

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Add a primitive for InvSubBytes + InvShiftRows +
InvMixColumns + AddRoundKey.

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 15:23:18 -07:00
parent 7c58cb972e
commit 15ff15982a
3 changed files with 82 additions and 0 deletions
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58
crypto/aes.c
View File

@ -1484,6 +1484,64 @@ void aesdec_ISB_ISR_AK_genrev(AESState *r, const AESState *s, const AESState *k)
aesdec_ISB_ISR_AK_swap(r, s, k, true);
}
/*
* Perform InvSubBytes + InvShiftRows + InvMixColumns + AddRoundKey.
*/
static inline void
aesdec_ISB_ISR_IMC_AK_swap(AESState *r, const AESState *st,
const AESState *rk, bool swap)
{
int swap_b = swap * 0xf;
int swap_w = swap * 0x3;
bool be = HOST_BIG_ENDIAN ^ swap;
uint32_t w0, w1, w2, w3;
w0 = (AES_Td0[st->b[swap_b ^ AES_ISH(0x0)]] ^
AES_Td1[st->b[swap_b ^ AES_ISH(0x1)]] ^
AES_Td2[st->b[swap_b ^ AES_ISH(0x2)]] ^
AES_Td3[st->b[swap_b ^ AES_ISH(0x3)]]);
w1 = (AES_Td0[st->b[swap_b ^ AES_ISH(0x4)]] ^
AES_Td1[st->b[swap_b ^ AES_ISH(0x5)]] ^
AES_Td2[st->b[swap_b ^ AES_ISH(0x6)]] ^
AES_Td3[st->b[swap_b ^ AES_ISH(0x7)]]);
w2 = (AES_Td0[st->b[swap_b ^ AES_ISH(0x8)]] ^
AES_Td1[st->b[swap_b ^ AES_ISH(0x9)]] ^
AES_Td2[st->b[swap_b ^ AES_ISH(0xA)]] ^
AES_Td3[st->b[swap_b ^ AES_ISH(0xB)]]);
w3 = (AES_Td0[st->b[swap_b ^ AES_ISH(0xC)]] ^
AES_Td1[st->b[swap_b ^ AES_ISH(0xD)]] ^
AES_Td2[st->b[swap_b ^ AES_ISH(0xE)]] ^
AES_Td3[st->b[swap_b ^ AES_ISH(0xF)]]);
/* Note that AES_TdX is encoded for big-endian. */
if (!be) {
w0 = bswap32(w0);
w1 = bswap32(w1);
w2 = bswap32(w2);
w3 = bswap32(w3);
}
r->w[swap_w ^ 0] = rk->w[swap_w ^ 0] ^ w0;
r->w[swap_w ^ 1] = rk->w[swap_w ^ 1] ^ w1;
r->w[swap_w ^ 2] = rk->w[swap_w ^ 2] ^ w2;
r->w[swap_w ^ 3] = rk->w[swap_w ^ 3] ^ w3;
}
void aesdec_ISB_ISR_IMC_AK_gen(AESState *r, const AESState *st,
const AESState *rk)
{
aesdec_ISB_ISR_IMC_AK_swap(r, st, rk, false);
}
void aesdec_ISB_ISR_IMC_AK_genrev(AESState *r, const AESState *st,
const AESState *rk)
{
aesdec_ISB_ISR_IMC_AK_swap(r, st, rk, true);
}
/**
* Expand the cipher key into the encryption key schedule.
*/

3
host/include/generic/host/crypto/aes-round.h
View File

@ -23,5 +23,8 @@ void aesdec_IMC_accel(AESState *, const AESState *, bool)
void aesdec_ISB_ISR_AK_accel(AESState *, const AESState *,
const AESState *, bool)
QEMU_ERROR("unsupported accel");
void aesdec_ISB_ISR_IMC_AK_accel(AESState *, const AESState *,
const AESState *, bool)
QEMU_ERROR("unsupported accel");
#endif /* GENERIC_HOST_CRYPTO_AES_ROUND_H */

21
include/crypto/aes-round.h
View File

@ -119,4 +119,25 @@ static inline void aesdec_ISB_ISR_AK(AESState *r, const AESState *st,
}
}
/*
* Perform InvSubBytes + InvShiftRows + InvMixColumns + AddRoundKey.
*/
void aesdec_ISB_ISR_IMC_AK_gen(AESState *ret, const AESState *st,
const AESState *rk);
void aesdec_ISB_ISR_IMC_AK_genrev(AESState *ret, const AESState *st,
const AESState *rk);
static inline void aesdec_ISB_ISR_IMC_AK(AESState *r, const AESState *st,
const AESState *rk, bool be)
{
if (HAVE_AES_ACCEL) {
aesdec_ISB_ISR_IMC_AK_accel(r, st, rk, be);
} else if (HOST_BIG_ENDIAN == be) {
aesdec_ISB_ISR_IMC_AK_gen(r, st, rk);
} else {
aesdec_ISB_ISR_IMC_AK_genrev(r, st, rk);
}
}
#endif /* CRYPTO_AES_ROUND_H */