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Armv8.1-M: Add native Keccak x4 XORBytes and ExtractBytes #972

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Armv8.1-M: Add native Keccak x4 XORBytes and ExtractBytes #972

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14d0fc0
Unit Tests: Extend Keccak x4 test to cover xor_bytes and extract_bytes
mkannwischer Feb 19, 2026
fe5f993
FIPS202: Add native x4 XOR/extract bytes interface
mkannwischer Feb 19, 2026
473cbfb
Armv8.1-M: Add native Keccak x4 XORBytes and ExtractBytes
mkannwischer Feb 19, 2026
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48 changes: 48 additions & 0 deletions dev/fips202/armv81m/mve.h
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Original file line number Diff line number Diff line change
Expand Up @@ -11,12 +11,18 @@

/* Part of backend API */
#define MLD_USE_FIPS202_X4_NATIVE
#define MLD_USE_FIPS202_X4_XOR_BYTES_NATIVE
#define MLD_USE_FIPS202_X4_EXTRACT_BYTES_NATIVE
/* Guard for assembly file */
#define MLD_FIPS202_ARMV81M_NEED_X4

#if !defined(__ASSEMBLER__)
#include "../api.h"

/*
* Native x4 permutation
* State is kept in bit-interleaved format.
*/
#define mld_keccak_f1600_x4_native_impl \
MLD_NAMESPACE(keccak_f1600_x4_native_impl)
int mld_keccak_f1600_x4_native_impl(uint64_t *state);
Expand All @@ -27,6 +33,48 @@ static MLD_INLINE int mld_keccak_f1600_x4_native(uint64_t *state)
return mld_keccak_f1600_x4_native_impl(state);
}

/*
* Native x4 XOR bytes (with on-the-fly bit interleaving)
*/
#define mld_keccak_f1600_x4_state_xor_bytes \
MLD_NAMESPACE(keccak_f1600_x4_state_xor_bytes_asm)
void mld_keccak_f1600_x4_state_xor_bytes(void *state, const uint8_t *data0,
const uint8_t *data1,
const uint8_t *data2,
const uint8_t *data3, unsigned offset,
unsigned length);

MLD_MUST_CHECK_RETURN_VALUE
static MLD_INLINE int mld_keccakf1600_xor_bytes_x4_native(
uint64_t *state, const uint8_t *data0, const uint8_t *data1,
const uint8_t *data2, const uint8_t *data3, unsigned offset,
unsigned length)
{
mld_keccak_f1600_x4_state_xor_bytes(state, data0, data1, data2, data3, offset,
length);
return MLD_NATIVE_FUNC_SUCCESS;
}

/*
* Native x4 extract bytes (with on-the-fly bit de-interleaving)
*/
#define mld_keccak_f1600_x4_state_extract_bytes \
MLD_NAMESPACE(keccak_f1600_x4_state_extract_bytes_asm)
void mld_keccak_f1600_x4_state_extract_bytes(void *state, uint8_t *data0,
uint8_t *data1, uint8_t *data2,
uint8_t *data3, unsigned offset,
unsigned length);

MLD_MUST_CHECK_RETURN_VALUE
static MLD_INLINE int mld_keccakf1600_extract_bytes_x4_native(
uint64_t *state, uint8_t *data0, uint8_t *data1, uint8_t *data2,
uint8_t *data3, unsigned offset, unsigned length)
{
mld_keccak_f1600_x4_state_extract_bytes(state, data0, data1, data2, data3,
offset, length);
return MLD_NATIVE_FUNC_SUCCESS;
}

#endif /* !__ASSEMBLER__ */

#endif /* !MLD_DEV_FIPS202_ARMV81M_MVE_H */
16 changes: 16 additions & 0 deletions dev/fips202/armv81m/src/fips202_native_armv81m.h
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Original file line number Diff line number Diff line change
Expand Up @@ -18,4 +18,20 @@ MLD_INTERNAL_DATA_DECLARATION const uint32_t
void mld_keccak_f1600_x4_mve_asm(uint64_t state[100], uint64_t tmpstate[100],
const uint32_t rc[48]);

#define mld_keccak_f1600_x4_state_xor_bytes_asm \
MLD_NAMESPACE(keccak_f1600_x4_state_xor_bytes_asm)
void mld_keccak_f1600_x4_state_xor_bytes_asm(void *state, const uint8_t *d0,
const uint8_t *d1,
const uint8_t *d2,
const uint8_t *d3, unsigned offset,
unsigned length);

#define mld_keccak_f1600_x4_state_extract_bytes_asm \
MLD_NAMESPACE(keccak_f1600_x4_state_extract_bytes_asm)
void mld_keccak_f1600_x4_state_extract_bytes_asm(void *state, uint8_t *data0,
uint8_t *data1, uint8_t *data2,
uint8_t *data3,
unsigned offset,
unsigned length);

#endif /* !MLD_DEV_FIPS202_ARMV81M_SRC_FIPS202_NATIVE_ARMV81M_H */
105 changes: 5 additions & 100 deletions dev/fips202/armv81m/src/keccak_f1600_x4_mve.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12,114 +12,19 @@

#include "fips202_native_armv81m.h"

/*
* TEMPORARY: Bit-interleaving using efficient shift-and-mask operations.
* TODO: Replace with optimized MVE assembly implementations
* (as a part of XORBytes and ExtractBytes)
*/

/* Extract even-indexed bits from 64-bit value into lower 32 bits */
static uint32_t bitinterleave_even(uint64_t x)
{
uint64_t t;
t = x & 0x5555555555555555ULL;
t = (t | (t >> 1)) & 0x3333333333333333ULL;
t = (t | (t >> 2)) & 0x0f0f0f0f0f0f0f0fULL;
t = (t | (t >> 4)) & 0x00ff00ff00ff00ffULL;
t = (t | (t >> 8)) & 0x0000ffff0000ffffULL;
t = (t | (t >> 16)) & 0x00000000ffffffffULL;
return (uint32_t)t;
}

/* Extract odd-indexed bits from 64-bit value into lower 32 bits */
static uint32_t bitinterleave_odd(uint64_t x)
{
return bitinterleave_even(x >> 1);
}

/* Spread 32-bit value across even bit positions of 64-bit result */
static uint64_t spread_even(uint32_t x)
{
uint64_t t = x;
t = (t | (t << 16)) & 0x0000ffff0000ffffULL;
t = (t | (t << 8)) & 0x00ff00ff00ff00ffULL;
t = (t | (t << 4)) & 0x0f0f0f0f0f0f0f0fULL;
t = (t | (t << 2)) & 0x3333333333333333ULL;
t = (t | (t << 1)) & 0x5555555555555555ULL;
return t;
}

/* Combine even and odd 32-bit halves into interleaved 64-bit value */
static uint64_t bitdeinterleave(uint32_t even, uint32_t odd)
{
return spread_even(even) | (spread_even(odd) << 1);
}

/*
* TEMPORARY: Naive C interleaving functions.
* These will be replaced with optimized MVE assembly implementations.
* Keccak-f1600 x4 permutation (on bit-interleaved state)
* State is expected to already be in bit-interleaved format.
*/
static void interleave_4fold(uint64_t *state_4x, const uint64_t *state0,
const uint64_t *state1, const uint64_t *state2,
const uint64_t *state3)
{
uint32_t *state_4xl = (uint32_t *)state_4x;
uint32_t *state_4xh = (uint32_t *)state_4x + 100;

for (size_t i = 0; i < 25; i++)
{
state_4xl[i * 4 + 0] = bitinterleave_even(state0[i]);
state_4xl[i * 4 + 1] = bitinterleave_even(state1[i]);
state_4xl[i * 4 + 2] = bitinterleave_even(state2[i]);
state_4xl[i * 4 + 3] = bitinterleave_even(state3[i]);

state_4xh[i * 4 + 0] = bitinterleave_odd(state0[i]);
state_4xh[i * 4 + 1] = bitinterleave_odd(state1[i]);
state_4xh[i * 4 + 2] = bitinterleave_odd(state2[i]);
state_4xh[i * 4 + 3] = bitinterleave_odd(state3[i]);
}
}

static void deinterleave_4fold(uint64_t *state_4x, uint64_t *state0,
uint64_t *state1, uint64_t *state2,
uint64_t *state3)
{
uint32_t *state_4xl = (uint32_t *)state_4x;
uint32_t *state_4xh = (uint32_t *)state_4x + 100;

for (size_t i = 0; i < 25; i++)
{
state0[i] = bitdeinterleave(state_4xl[i * 4 + 0], state_4xh[i * 4 + 0]);
state1[i] = bitdeinterleave(state_4xl[i * 4 + 1], state_4xh[i * 4 + 1]);
state2[i] = bitdeinterleave(state_4xl[i * 4 + 2], state_4xh[i * 4 + 2]);
state3[i] = bitdeinterleave(state_4xl[i * 4 + 3], state_4xh[i * 4 + 3]);
}
}

#define mld_keccak_f1600_x4_native_impl \
MLD_NAMESPACE(keccak_f1600_x4_native_impl)
int mld_keccak_f1600_x4_native_impl(uint64_t *state)
{
/*
* TEMPORARY: Bit-interleaving using efficient shift-and-mask operations.
* TODO: Replace with optimized MVE assembly implementations
* (as a part of XORBytes and ExtractBytes)
*/
MLD_ALIGN uint64_t state_4x[100];
MLD_ALIGN uint64_t state_4x_tmp[100];

/* Interleave the 4 states into bit-interleaved format */
interleave_4fold(state_4x, &state[0], &state[25], &state[50], &state[75]);

/* Run the permutation */
mld_keccak_f1600_x4_mve_asm(state_4x, state_4x_tmp,
MLD_ALIGN uint64_t state_tmp[100];
mld_keccak_f1600_x4_mve_asm(state, state_tmp,
mld_keccakf1600_round_constants);

/* Deinterleave back to 4 separate states */
deinterleave_4fold(state_4x, &state[0], &state[25], &state[50], &state[75]);

mld_zeroize(state_4x, sizeof(state_4x));
mld_zeroize(state_4x_tmp, sizeof(state_4x_tmp));
mld_zeroize(state_tmp, sizeof(state_tmp));
return MLD_NATIVE_FUNC_SUCCESS;
}

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