target/arm: Implement pauth_computepac

This is the main crypto routine, an implementation of QARMA.
This matches, as much as possible, ARM pseudocode.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20190108223129.5570-28-richard.henderson@linaro.org
[PMM: fixed minor checkpatch nits]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2019-01-21 10:23:13 +00:00 committed by Peter Maydell
parent 63ff0ca94c
commit 990870b205

View File

@ -26,10 +26,250 @@
#include "tcg/tcg-gvec-desc.h"
static uint64_t pac_cell_shuffle(uint64_t i)
{
uint64_t o = 0;
o |= extract64(i, 52, 4);
o |= extract64(i, 24, 4) << 4;
o |= extract64(i, 44, 4) << 8;
o |= extract64(i, 0, 4) << 12;
o |= extract64(i, 28, 4) << 16;
o |= extract64(i, 48, 4) << 20;
o |= extract64(i, 4, 4) << 24;
o |= extract64(i, 40, 4) << 28;
o |= extract64(i, 32, 4) << 32;
o |= extract64(i, 12, 4) << 36;
o |= extract64(i, 56, 4) << 40;
o |= extract64(i, 20, 4) << 44;
o |= extract64(i, 8, 4) << 48;
o |= extract64(i, 36, 4) << 52;
o |= extract64(i, 16, 4) << 56;
o |= extract64(i, 60, 4) << 60;
return o;
}
static uint64_t pac_cell_inv_shuffle(uint64_t i)
{
uint64_t o = 0;
o |= extract64(i, 12, 4);
o |= extract64(i, 24, 4) << 4;
o |= extract64(i, 48, 4) << 8;
o |= extract64(i, 36, 4) << 12;
o |= extract64(i, 56, 4) << 16;
o |= extract64(i, 44, 4) << 20;
o |= extract64(i, 4, 4) << 24;
o |= extract64(i, 16, 4) << 28;
o |= i & MAKE_64BIT_MASK(32, 4);
o |= extract64(i, 52, 4) << 36;
o |= extract64(i, 28, 4) << 40;
o |= extract64(i, 8, 4) << 44;
o |= extract64(i, 20, 4) << 48;
o |= extract64(i, 0, 4) << 52;
o |= extract64(i, 40, 4) << 56;
o |= i & MAKE_64BIT_MASK(60, 4);
return o;
}
static uint64_t pac_sub(uint64_t i)
{
static const uint8_t sub[16] = {
0xb, 0x6, 0x8, 0xf, 0xc, 0x0, 0x9, 0xe,
0x3, 0x7, 0x4, 0x5, 0xd, 0x2, 0x1, 0xa,
};
uint64_t o = 0;
int b;
for (b = 0; b < 64; b += 16) {
o |= (uint64_t)sub[(i >> b) & 0xf] << b;
}
return o;
}
static uint64_t pac_inv_sub(uint64_t i)
{
static const uint8_t inv_sub[16] = {
0x5, 0xe, 0xd, 0x8, 0xa, 0xb, 0x1, 0x9,
0x2, 0x6, 0xf, 0x0, 0x4, 0xc, 0x7, 0x3,
};
uint64_t o = 0;
int b;
for (b = 0; b < 64; b += 16) {
o |= (uint64_t)inv_sub[(i >> b) & 0xf] << b;
}
return o;
}
static int rot_cell(int cell, int n)
{
/* 4-bit rotate left by n. */
cell |= cell << 4;
return extract32(cell, 4 - n, 4);
}
static uint64_t pac_mult(uint64_t i)
{
uint64_t o = 0;
int b;
for (b = 0; b < 4 * 4; b += 4) {
int i0, i4, i8, ic, t0, t1, t2, t3;
i0 = extract64(i, b, 4);
i4 = extract64(i, b + 4 * 4, 4);
i8 = extract64(i, b + 8 * 4, 4);
ic = extract64(i, b + 12 * 4, 4);
t0 = rot_cell(i8, 1) ^ rot_cell(i4, 2) ^ rot_cell(i0, 1);
t1 = rot_cell(ic, 1) ^ rot_cell(i4, 1) ^ rot_cell(i0, 2);
t2 = rot_cell(ic, 2) ^ rot_cell(i8, 1) ^ rot_cell(i0, 1);
t3 = rot_cell(ic, 1) ^ rot_cell(i8, 2) ^ rot_cell(i4, 1);
o |= (uint64_t)t3 << b;
o |= (uint64_t)t2 << (b + 4 * 4);
o |= (uint64_t)t1 << (b + 8 * 4);
o |= (uint64_t)t0 << (b + 12 * 4);
}
return o;
}
static uint64_t tweak_cell_rot(uint64_t cell)
{
return (cell >> 1) | (((cell ^ (cell >> 1)) & 1) << 3);
}
static uint64_t tweak_shuffle(uint64_t i)
{
uint64_t o = 0;
o |= extract64(i, 16, 4) << 0;
o |= extract64(i, 20, 4) << 4;
o |= tweak_cell_rot(extract64(i, 24, 4)) << 8;
o |= extract64(i, 28, 4) << 12;
o |= tweak_cell_rot(extract64(i, 44, 4)) << 16;
o |= extract64(i, 8, 4) << 20;
o |= extract64(i, 12, 4) << 24;
o |= tweak_cell_rot(extract64(i, 32, 4)) << 28;
o |= extract64(i, 48, 4) << 32;
o |= extract64(i, 52, 4) << 36;
o |= extract64(i, 56, 4) << 40;
o |= tweak_cell_rot(extract64(i, 60, 4)) << 44;
o |= tweak_cell_rot(extract64(i, 0, 4)) << 48;
o |= extract64(i, 4, 4) << 52;
o |= tweak_cell_rot(extract64(i, 40, 4)) << 56;
o |= tweak_cell_rot(extract64(i, 36, 4)) << 60;
return o;
}
static uint64_t tweak_cell_inv_rot(uint64_t cell)
{
return ((cell << 1) & 0xf) | ((cell & 1) ^ (cell >> 3));
}
static uint64_t tweak_inv_shuffle(uint64_t i)
{
uint64_t o = 0;
o |= tweak_cell_inv_rot(extract64(i, 48, 4));
o |= extract64(i, 52, 4) << 4;
o |= extract64(i, 20, 4) << 8;
o |= extract64(i, 24, 4) << 12;
o |= extract64(i, 0, 4) << 16;
o |= extract64(i, 4, 4) << 20;
o |= tweak_cell_inv_rot(extract64(i, 8, 4)) << 24;
o |= extract64(i, 12, 4) << 28;
o |= tweak_cell_inv_rot(extract64(i, 28, 4)) << 32;
o |= tweak_cell_inv_rot(extract64(i, 60, 4)) << 36;
o |= tweak_cell_inv_rot(extract64(i, 56, 4)) << 40;
o |= tweak_cell_inv_rot(extract64(i, 16, 4)) << 44;
o |= extract64(i, 32, 4) << 48;
o |= extract64(i, 36, 4) << 52;
o |= extract64(i, 40, 4) << 56;
o |= tweak_cell_inv_rot(extract64(i, 44, 4)) << 60;
return o;
}
static uint64_t pauth_computepac(uint64_t data, uint64_t modifier,
ARMPACKey key)
{
g_assert_not_reached(); /* FIXME */
static const uint64_t RC[5] = {
0x0000000000000000ull,
0x13198A2E03707344ull,
0xA4093822299F31D0ull,
0x082EFA98EC4E6C89ull,
0x452821E638D01377ull,
};
const uint64_t alpha = 0xC0AC29B7C97C50DDull;
/*
* Note that in the ARM pseudocode, key0 contains bits <127:64>
* and key1 contains bits <63:0> of the 128-bit key.
*/
uint64_t key0 = key.hi, key1 = key.lo;
uint64_t workingval, runningmod, roundkey, modk0;
int i;
modk0 = (key0 << 63) | ((key0 >> 1) ^ (key0 >> 63));
runningmod = modifier;
workingval = data ^ key0;
for (i = 0; i <= 4; ++i) {
roundkey = key1 ^ runningmod;
workingval ^= roundkey;
workingval ^= RC[i];
if (i > 0) {
workingval = pac_cell_shuffle(workingval);
workingval = pac_mult(workingval);
}
workingval = pac_sub(workingval);
runningmod = tweak_shuffle(runningmod);
}
roundkey = modk0 ^ runningmod;
workingval ^= roundkey;
workingval = pac_cell_shuffle(workingval);
workingval = pac_mult(workingval);
workingval = pac_sub(workingval);
workingval = pac_cell_shuffle(workingval);
workingval = pac_mult(workingval);
workingval ^= key1;
workingval = pac_cell_inv_shuffle(workingval);
workingval = pac_inv_sub(workingval);
workingval = pac_mult(workingval);
workingval = pac_cell_inv_shuffle(workingval);
workingval ^= key0;
workingval ^= runningmod;
for (i = 0; i <= 4; ++i) {
workingval = pac_inv_sub(workingval);
if (i < 4) {
workingval = pac_mult(workingval);
workingval = pac_cell_inv_shuffle(workingval);
}
runningmod = tweak_inv_shuffle(runningmod);
roundkey = key1 ^ runningmod;
workingval ^= RC[4 - i];
workingval ^= roundkey;
workingval ^= alpha;
}
workingval ^= modk0;
return workingval;
}
static uint64_t pauth_addpac(CPUARMState *env, uint64_t ptr, uint64_t modifier,