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target-i386: simplify AES emulation

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This patch simplifies the AES code, by directly accessing the newly added
S-Box, InvS-Box and InvMixColumns tables instead of recreating them by
using the AES_Te and AES_Td tables.

Backports commit 9551ea6991cfb7c777f7943ad69b30d0a4fadac3 from qemu
This commit is contained in:
Aurelien Jarno 2018-02-14 15:54:22 -05:00 committed by Lioncash
parent 5e9ea14b7e
commit a771209389
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 8 additions and 8 deletions
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16
qemu/target-i386/ops_sse.h
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@ -2228,7 +2228,7 @@ void glue(helper_aesdeclast, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
Reg rk = *s;
for (i = 0; i < 16; i++) {
d->B(i) = rk.B(i) ^ (AES_Td4[st.B(AES_ishifts[i])] & 0xff);
d->B(i) = rk.B(i) ^ (AES_isbox[st.B(AES_ishifts[i])]);
}
}
@ -2253,7 +2253,7 @@ void glue(helper_aesenclast, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
Reg rk = *s;
for (i = 0; i < 16; i++) {
d->B(i) = rk.B(i) ^ (AES_Te4[st.B(AES_shifts[i])] & 0xff);
d->B(i) = rk.B(i) ^ (AES_sbox[st.B(AES_shifts[i])]);
}
}
@ -2264,10 +2264,10 @@ void glue(helper_aesimc, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
Reg tmp = *s;
for (i = 0 ; i < 4 ; i++) {
d->L(i) = bswap32(AES_Td0[AES_Te4[tmp.B(4*i+0)] & 0xff] ^
AES_Td1[AES_Te4[tmp.B(4*i+1)] & 0xff] ^
AES_Td2[AES_Te4[tmp.B(4*i+2)] & 0xff] ^
AES_Td3[AES_Te4[tmp.B(4*i+3)] & 0xff]);
d->L(i) = bswap32(AES_imc[tmp.B(4*i+0)][0] ^
AES_imc[tmp.B(4*i+1)][1] ^
AES_imc[tmp.B(4*i+2)][2] ^
AES_imc[tmp.B(4*i+3)][3]);
}
}
@ -2278,8 +2278,8 @@ void glue(helper_aeskeygenassist, SUFFIX)(CPUX86State *env, Reg *d, Reg *s,
Reg tmp = *s;
for (i = 0 ; i < 4 ; i++) {
d->B(i) = AES_Te4[tmp.B(i + 4)] & 0xff;
d->B(i + 8) = AES_Te4[tmp.B(i + 12)] & 0xff;
d->B(i) = AES_sbox[tmp.B(i + 4)];
d->B(i + 8) = AES_sbox[tmp.B(i + 12)];
}
d->L(1) = (d->L(0) << 24 | d->L(0) >> 8) ^ ctrl;
d->L(3) = (d->L(2) << 24 | d->L(2) >> 8) ^ ctrl;