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fips202x4.c
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/*
* Copyright (c) 2024 The mlkem-native project authors
* SPDX-License-Identifier: Apache-2.0
*/
#include "../common.h"
#if !defined(MLKEM_NATIVE_MULTILEVEL_BUILD_NO_SHARED)
#include <string.h>
#include "fips202.h"
#include "fips202x4.h"
#include "keccakf1600.h"
#define shake256x4_ctx FIPS202_NAMESPACE(shake256x4_ctx)
typedef shake128x4ctx shake256x4_ctx;
/* Static namespacing
* This is to facilitate building multiple instances
* of mlkem-native (e.g. with varying security levels)
* within a single compilation unit. */
#define keccak_absorb_once_x4 FIPS202_NAMESPACE(keccak_absorb_once_x4)
#define keccak_squeezeblocks_x4 FIPS202_NAMESPACE(keccak_squeezeblocks_x4)
#define shake256x4_absorb_once FIPS202_NAMESPACE(shake256x4_absorb_once)
#define shake256x4_squeezeblocks FIPS202_NAMESPACE(shake256x4_squeezeblocks)
/* End of static namespacing */
static void keccak_absorb_once_x4(uint64_t *s, uint32_t r, const uint8_t *in0,
const uint8_t *in1, const uint8_t *in2,
const uint8_t *in3, size_t inlen, uint8_t p)
__contract__(
requires(memory_no_alias(s, sizeof(uint64_t) * KECCAK_LANES * KECCAK_WAY))
requires(r <= sizeof(uint64_t) * KECCAK_LANES)
requires(memory_no_alias(in0, inlen))
requires(memory_no_alias(in1, inlen))
requires(memory_no_alias(in2, inlen))
requires(memory_no_alias(in3, inlen))
assigns(memory_slice(s, sizeof(uint64_t) * KECCAK_LANES * KECCAK_WAY)))
{
while (inlen >= r)
__loop__(
assigns(inlen, in0, in1, in2, in3, memory_slice(s, sizeof(uint64_t) * KECCAK_LANES * KECCAK_WAY))
invariant(inlen <= loop_entry(inlen))
invariant(in0 == loop_entry(in0) + (loop_entry(inlen) - inlen))
invariant(in1 == loop_entry(in1) + (loop_entry(inlen) - inlen))
invariant(in2 == loop_entry(in2) + (loop_entry(inlen) - inlen))
invariant(in3 == loop_entry(in3) + (loop_entry(inlen) - inlen)))
{
KeccakF1600x4_StateXORBytes(s, in0, in1, in2, in3, 0, r);
KeccakF1600x4_StatePermute(s);
in0 += r;
in1 += r;
in2 += r;
in3 += r;
inlen -= r;
}
if (inlen > 0)
{
KeccakF1600x4_StateXORBytes(s, in0, in1, in2, in3, 0, inlen);
}
if (inlen == r - 1)
{
p |= 128;
KeccakF1600x4_StateXORBytes(s, &p, &p, &p, &p, inlen, 1);
}
else
{
KeccakF1600x4_StateXORBytes(s, &p, &p, &p, &p, inlen, 1);
p = 128;
KeccakF1600x4_StateXORBytes(s, &p, &p, &p, &p, r - 1, 1);
}
}
static void keccak_squeezeblocks_x4(uint8_t *out0, uint8_t *out1, uint8_t *out2,
uint8_t *out3, size_t nblocks, uint64_t *s,
uint32_t r)
__contract__(
requires(r <= sizeof(uint64_t) * KECCAK_LANES)
requires(nblocks <= 8 /* somewhat arbitrary bound */)
requires(memory_no_alias(s, sizeof(uint64_t) * KECCAK_LANES * KECCAK_WAY))
requires(memory_no_alias(out0, nblocks * r))
requires(memory_no_alias(out1, nblocks * r))
requires(memory_no_alias(out2, nblocks * r))
requires(memory_no_alias(out3, nblocks * r))
assigns(memory_slice(s, sizeof(uint64_t) * KECCAK_LANES * KECCAK_WAY))
assigns(memory_slice(out0, nblocks * r))
assigns(memory_slice(out1, nblocks * r))
assigns(memory_slice(out2, nblocks * r))
assigns(memory_slice(out3, nblocks * r)))
{
while (nblocks > 0)
__loop__(
assigns(out0, out1, out2, out3, nblocks,
memory_slice(s, sizeof(uint64_t) * KECCAK_LANES * KECCAK_WAY),
memory_slice(out0, nblocks * r),
memory_slice(out1, nblocks * r),
memory_slice(out2, nblocks * r),
memory_slice(out3, nblocks * r))
invariant(nblocks <= loop_entry(nblocks) &&
out0 == loop_entry(out0) + r * (loop_entry(nblocks) - nblocks) &&
out1 == loop_entry(out1) + r * (loop_entry(nblocks) - nblocks) &&
out2 == loop_entry(out2) + r * (loop_entry(nblocks) - nblocks) &&
out3 == loop_entry(out3) + r * (loop_entry(nblocks) - nblocks)))
{
KeccakF1600x4_StatePermute(s);
KeccakF1600x4_StateExtractBytes(s, out0, out1, out2, out3, 0, r);
out0 += r;
out1 += r;
out2 += r;
out3 += r;
nblocks--;
}
}
void shake128x4_absorb_once(shake128x4ctx *state, const uint8_t *in0,
const uint8_t *in1, const uint8_t *in2,
const uint8_t *in3, size_t inlen)
{
memset(state, 0, sizeof(shake128x4ctx));
keccak_absorb_once_x4(state->ctx, SHAKE128_RATE, in0, in1, in2, in3, inlen,
0x1F);
}
void shake128x4_squeezeblocks(uint8_t *out0, uint8_t *out1, uint8_t *out2,
uint8_t *out3, size_t nblocks,
shake128x4ctx *state)
{
keccak_squeezeblocks_x4(out0, out1, out2, out3, nblocks, state->ctx,
SHAKE128_RATE);
}
void shake128x4_release(shake128x4ctx *state) { (void)state; }
static void shake256x4_absorb_once(shake256x4_ctx *state, const uint8_t *in0,
const uint8_t *in1, const uint8_t *in2,
const uint8_t *in3, size_t inlen)
{
memset(state, 0, sizeof(shake128x4ctx));
keccak_absorb_once_x4(state->ctx, SHAKE256_RATE, in0, in1, in2, in3, inlen,
0x1F);
}
static void shake256x4_squeezeblocks(uint8_t *out0, uint8_t *out1,
uint8_t *out2, uint8_t *out3,
size_t nblocks, shake256x4_ctx *state)
{
keccak_squeezeblocks_x4(out0, out1, out2, out3, nblocks, state->ctx,
SHAKE256_RATE);
}
void shake256x4(uint8_t *out0, uint8_t *out1, uint8_t *out2, uint8_t *out3,
size_t outlen, uint8_t *in0, uint8_t *in1, uint8_t *in2,
uint8_t *in3, size_t inlen)
{
shake256x4_ctx statex;
size_t nblocks = outlen / SHAKE256_RATE;
uint8_t tmp0[SHAKE256_RATE];
uint8_t tmp1[SHAKE256_RATE];
uint8_t tmp2[SHAKE256_RATE];
uint8_t tmp3[SHAKE256_RATE];
shake256x4_absorb_once(&statex, in0, in1, in2, in3, inlen);
shake256x4_squeezeblocks(out0, out1, out2, out3, nblocks, &statex);
out0 += nblocks * SHAKE256_RATE;
out1 += nblocks * SHAKE256_RATE;
out2 += nblocks * SHAKE256_RATE;
out3 += nblocks * SHAKE256_RATE;
outlen -= nblocks * SHAKE256_RATE;
if (outlen)
{
shake256x4_squeezeblocks(tmp0, tmp1, tmp2, tmp3, 1, &statex);
memcpy(out0, tmp0, outlen);
memcpy(out1, tmp1, outlen);
memcpy(out2, tmp2, outlen);
memcpy(out3, tmp3, outlen);
}
}
#else /* MLKEM_NATIVE_MULTILEVEL_BUILD_NO_SHARED */
#define empty_cu_fips202x4 MLKEM_NAMESPACE_K(empty_cu_fips202x4)
int empty_cu_fips202x4;
#endif /* MLKEM_NATIVE_MULTILEVEL_BUILD_NO_SHARED */