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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2015-2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
* Copyright (c) 2022 The FreeBSD Foundation
*/
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/mbuf.h>
#include <opencrypto/cryptodev.h>
#include "crypto.h"
#ifndef COMPAT_NEED_CHACHA20POLY1305_MBUF
static crypto_session_t chacha20_poly1305_sid;
#endif
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
#ifndef noinline
#define noinline __attribute__((noinline))
#endif
#ifndef __aligned
#define __aligned(x) __attribute__((aligned(x)))
#endif
#ifndef DIV_ROUND_UP
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
#endif
#define le32_to_cpup(a) le32toh(*(a))
#define le64_to_cpup(a) le64toh(*(a))
#define cpu_to_le32(a) htole32(a)
#define cpu_to_le64(a) htole64(a)
static inline __unused uint32_t get_unaligned_le32(const uint8_t *a)
{
uint32_t l;
__builtin_memcpy(&l, a, sizeof(l));
return le32_to_cpup(&l);
}
static inline __unused uint64_t get_unaligned_le64(const uint8_t *a)
{
uint64_t l;
__builtin_memcpy(&l, a, sizeof(l));
return le64_to_cpup(&l);
}
static inline __unused void put_unaligned_le32(uint32_t s, uint8_t *d)
{
uint32_t l = cpu_to_le32(s);
__builtin_memcpy(d, &l, sizeof(l));
}
static inline __unused void cpu_to_le32_array(uint32_t *buf, unsigned int words)
{
while (words--) {
*buf = cpu_to_le32(*buf);
++buf;
}
}
static inline __unused void le32_to_cpu_array(uint32_t *buf, unsigned int words)
{
while (words--) {
*buf = le32_to_cpup(buf);
++buf;
}
}
static inline __unused uint32_t rol32(uint32_t word, unsigned int shift)
{
return (word << (shift & 31)) | (word >> ((-shift) & 31));
}
static inline __unused uint32_t ror32(uint32_t word, unsigned int shift)
{
return (word >> (shift & 31)) | (word << ((-shift) & 31));
}
#if defined(COMPAT_NEED_CHACHA20POLY1305) || defined(COMPAT_NEED_CHACHA20POLY1305_MBUF)
static void xor_cpy(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, size_t len)
{
size_t i;
for (i = 0; i < len; ++i)
dst[i] = src1[i] ^ src2[i];
}
#define QUARTER_ROUND(x, a, b, c, d) ( \
x[a] += x[b], \
x[d] = rol32((x[d] ^ x[a]), 16), \
x[c] += x[d], \
x[b] = rol32((x[b] ^ x[c]), 12), \
x[a] += x[b], \
x[d] = rol32((x[d] ^ x[a]), 8), \
x[c] += x[d], \
x[b] = rol32((x[b] ^ x[c]), 7) \
)
#define C(i, j) (i * 4 + j)
#define DOUBLE_ROUND(x) ( \
/* Column Round */ \
QUARTER_ROUND(x, C(0, 0), C(1, 0), C(2, 0), C(3, 0)), \
QUARTER_ROUND(x, C(0, 1), C(1, 1), C(2, 1), C(3, 1)), \
QUARTER_ROUND(x, C(0, 2), C(1, 2), C(2, 2), C(3, 2)), \
QUARTER_ROUND(x, C(0, 3), C(1, 3), C(2, 3), C(3, 3)), \
/* Diagonal Round */ \
QUARTER_ROUND(x, C(0, 0), C(1, 1), C(2, 2), C(3, 3)), \
QUARTER_ROUND(x, C(0, 1), C(1, 2), C(2, 3), C(3, 0)), \
QUARTER_ROUND(x, C(0, 2), C(1, 3), C(2, 0), C(3, 1)), \
QUARTER_ROUND(x, C(0, 3), C(1, 0), C(2, 1), C(3, 2)) \
)
#define TWENTY_ROUNDS(x) ( \
DOUBLE_ROUND(x), \
DOUBLE_ROUND(x), \
DOUBLE_ROUND(x), \
DOUBLE_ROUND(x), \
DOUBLE_ROUND(x), \
DOUBLE_ROUND(x), \
DOUBLE_ROUND(x), \
DOUBLE_ROUND(x), \
DOUBLE_ROUND(x), \
DOUBLE_ROUND(x) \
)
enum chacha20_lengths {
CHACHA20_NONCE_SIZE = 16,
CHACHA20_KEY_SIZE = 32,
CHACHA20_KEY_WORDS = CHACHA20_KEY_SIZE / sizeof(uint32_t),
CHACHA20_BLOCK_SIZE = 64,
CHACHA20_BLOCK_WORDS = CHACHA20_BLOCK_SIZE / sizeof(uint32_t),
HCHACHA20_NONCE_SIZE = CHACHA20_NONCE_SIZE,
HCHACHA20_KEY_SIZE = CHACHA20_KEY_SIZE
};
enum chacha20_constants { /* expand 32-byte k */
CHACHA20_CONSTANT_EXPA = 0x61707865U,
CHACHA20_CONSTANT_ND_3 = 0x3320646eU,
CHACHA20_CONSTANT_2_BY = 0x79622d32U,
CHACHA20_CONSTANT_TE_K = 0x6b206574U
};
struct chacha20_ctx {
union {
uint32_t state[16];
struct {
uint32_t constant[4];
uint32_t key[8];
uint32_t counter[4];
};
};
};
static void chacha20_init(struct chacha20_ctx *ctx,
const uint8_t key[CHACHA20_KEY_SIZE],
const uint64_t nonce)
{
ctx->constant[0] = CHACHA20_CONSTANT_EXPA;
ctx->constant[1] = CHACHA20_CONSTANT_ND_3;
ctx->constant[2] = CHACHA20_CONSTANT_2_BY;
ctx->constant[3] = CHACHA20_CONSTANT_TE_K;
ctx->key[0] = get_unaligned_le32(key + 0);
ctx->key[1] = get_unaligned_le32(key + 4);
ctx->key[2] = get_unaligned_le32(key + 8);
ctx->key[3] = get_unaligned_le32(key + 12);
ctx->key[4] = get_unaligned_le32(key + 16);
ctx->key[5] = get_unaligned_le32(key + 20);
ctx->key[6] = get_unaligned_le32(key + 24);
ctx->key[7] = get_unaligned_le32(key + 28);
ctx->counter[0] = 0;
ctx->counter[1] = 0;
ctx->counter[2] = nonce & 0xffffffffU;
ctx->counter[3] = nonce >> 32;
}
static void chacha20_block(struct chacha20_ctx *ctx, uint32_t *stream)
{
uint32_t x[CHACHA20_BLOCK_WORDS];
int i;
for (i = 0; i < ARRAY_SIZE(x); ++i)
x[i] = ctx->state[i];
TWENTY_ROUNDS(x);
for (i = 0; i < ARRAY_SIZE(x); ++i)
stream[i] = cpu_to_le32(x[i] + ctx->state[i]);
ctx->counter[0] += 1;
}
static void chacha20(struct chacha20_ctx *ctx, uint8_t *out, const uint8_t *in,
uint32_t len)
{
uint32_t buf[CHACHA20_BLOCK_WORDS];
while (len >= CHACHA20_BLOCK_SIZE) {
chacha20_block(ctx, buf);
xor_cpy(out, in, (uint8_t *)buf, CHACHA20_BLOCK_SIZE);
len -= CHACHA20_BLOCK_SIZE;
out += CHACHA20_BLOCK_SIZE;
in += CHACHA20_BLOCK_SIZE;
}
if (len) {
chacha20_block(ctx, buf);
xor_cpy(out, in, (uint8_t *)buf, len);
}
}
static void hchacha20(uint32_t derived_key[CHACHA20_KEY_WORDS],
const uint8_t nonce[HCHACHA20_NONCE_SIZE],
const uint8_t key[HCHACHA20_KEY_SIZE])
{
uint32_t x[] = { CHACHA20_CONSTANT_EXPA,
CHACHA20_CONSTANT_ND_3,
CHACHA20_CONSTANT_2_BY,
CHACHA20_CONSTANT_TE_K,
get_unaligned_le32(key + 0),
get_unaligned_le32(key + 4),
get_unaligned_le32(key + 8),
get_unaligned_le32(key + 12),
get_unaligned_le32(key + 16),
get_unaligned_le32(key + 20),
get_unaligned_le32(key + 24),
get_unaligned_le32(key + 28),
get_unaligned_le32(nonce + 0),
get_unaligned_le32(nonce + 4),
get_unaligned_le32(nonce + 8),
get_unaligned_le32(nonce + 12)
};
TWENTY_ROUNDS(x);
memcpy(derived_key + 0, x + 0, sizeof(uint32_t) * 4);
memcpy(derived_key + 4, x + 12, sizeof(uint32_t) * 4);
}
enum poly1305_lengths {
POLY1305_BLOCK_SIZE = 16,
POLY1305_KEY_SIZE = 32,
POLY1305_MAC_SIZE = 16
};
struct poly1305_internal {
uint32_t h[5];
uint32_t r[5];
uint32_t s[4];
};
struct poly1305_ctx {
struct poly1305_internal state;
uint32_t nonce[4];
uint8_t data[POLY1305_BLOCK_SIZE];
size_t num;
};
static void poly1305_init_core(struct poly1305_internal *st,
const uint8_t key[16])
{
/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
st->r[0] = (get_unaligned_le32(&key[0])) & 0x3ffffff;
st->r[1] = (get_unaligned_le32(&key[3]) >> 2) & 0x3ffff03;
st->r[2] = (get_unaligned_le32(&key[6]) >> 4) & 0x3ffc0ff;
st->r[3] = (get_unaligned_le32(&key[9]) >> 6) & 0x3f03fff;
st->r[4] = (get_unaligned_le32(&key[12]) >> 8) & 0x00fffff;
/* s = 5*r */
st->s[0] = st->r[1] * 5;
st->s[1] = st->r[2] * 5;
st->s[2] = st->r[3] * 5;
st->s[3] = st->r[4] * 5;
/* h = 0 */
st->h[0] = 0;
st->h[1] = 0;
st->h[2] = 0;
st->h[3] = 0;
st->h[4] = 0;
}
static void poly1305_blocks_core(struct poly1305_internal *st,
const uint8_t *input, size_t len,
const uint32_t padbit)
{
const uint32_t hibit = padbit << 24;
uint32_t r0, r1, r2, r3, r4;
uint32_t s1, s2, s3, s4;
uint32_t h0, h1, h2, h3, h4;
uint64_t d0, d1, d2, d3, d4;
uint32_t c;
r0 = st->r[0];
r1 = st->r[1];
r2 = st->r[2];
r3 = st->r[3];
r4 = st->r[4];
s1 = st->s[0];
s2 = st->s[1];
s3 = st->s[2];
s4 = st->s[3];
h0 = st->h[0];
h1 = st->h[1];
h2 = st->h[2];
h3 = st->h[3];
h4 = st->h[4];
while (len >= POLY1305_BLOCK_SIZE) {
/* h += m[i] */
h0 += (get_unaligned_le32(&input[0])) & 0x3ffffff;
h1 += (get_unaligned_le32(&input[3]) >> 2) & 0x3ffffff;
h2 += (get_unaligned_le32(&input[6]) >> 4) & 0x3ffffff;
h3 += (get_unaligned_le32(&input[9]) >> 6) & 0x3ffffff;
h4 += (get_unaligned_le32(&input[12]) >> 8) | hibit;
/* h *= r */
d0 = ((uint64_t)h0 * r0) + ((uint64_t)h1 * s4) +
((uint64_t)h2 * s3) + ((uint64_t)h3 * s2) +
((uint64_t)h4 * s1);
d1 = ((uint64_t)h0 * r1) + ((uint64_t)h1 * r0) +
((uint64_t)h2 * s4) + ((uint64_t)h3 * s3) +
((uint64_t)h4 * s2);
d2 = ((uint64_t)h0 * r2) + ((uint64_t)h1 * r1) +
((uint64_t)h2 * r0) + ((uint64_t)h3 * s4) +
((uint64_t)h4 * s3);
d3 = ((uint64_t)h0 * r3) + ((uint64_t)h1 * r2) +
((uint64_t)h2 * r1) + ((uint64_t)h3 * r0) +
((uint64_t)h4 * s4);
d4 = ((uint64_t)h0 * r4) + ((uint64_t)h1 * r3) +
((uint64_t)h2 * r2) + ((uint64_t)h3 * r1) +
((uint64_t)h4 * r0);
/* (partial) h %= p */
c = (uint32_t)(d0 >> 26);
h0 = (uint32_t)d0 & 0x3ffffff;
d1 += c;
c = (uint32_t)(d1 >> 26);
h1 = (uint32_t)d1 & 0x3ffffff;
d2 += c;
c = (uint32_t)(d2 >> 26);
h2 = (uint32_t)d2 & 0x3ffffff;
d3 += c;
c = (uint32_t)(d3 >> 26);
h3 = (uint32_t)d3 & 0x3ffffff;
d4 += c;
c = (uint32_t)(d4 >> 26);
h4 = (uint32_t)d4 & 0x3ffffff;
h0 += c * 5;
c = (h0 >> 26);
h0 = h0 & 0x3ffffff;
h1 += c;
input += POLY1305_BLOCK_SIZE;
len -= POLY1305_BLOCK_SIZE;
}
st->h[0] = h0;
st->h[1] = h1;
st->h[2] = h2;
st->h[3] = h3;
st->h[4] = h4;
}
static void poly1305_emit_core(struct poly1305_internal *st, uint8_t mac[16],
const uint32_t nonce[4])
{
uint32_t h0, h1, h2, h3, h4, c;
uint32_t g0, g1, g2, g3, g4;
uint64_t f;
uint32_t mask;
/* fully carry h */
h0 = st->h[0];
h1 = st->h[1];
h2 = st->h[2];
h3 = st->h[3];
h4 = st->h[4];
c = h1 >> 26;
h1 = h1 & 0x3ffffff;
h2 += c;
c = h2 >> 26;
h2 = h2 & 0x3ffffff;
h3 += c;
c = h3 >> 26;
h3 = h3 & 0x3ffffff;
h4 += c;
c = h4 >> 26;
h4 = h4 & 0x3ffffff;
h0 += c * 5;
c = h0 >> 26;
h0 = h0 & 0x3ffffff;
h1 += c;
/* compute h + -p */
g0 = h0 + 5;
c = g0 >> 26;
g0 &= 0x3ffffff;
g1 = h1 + c;
c = g1 >> 26;
g1 &= 0x3ffffff;
g2 = h2 + c;
c = g2 >> 26;
g2 &= 0x3ffffff;
g3 = h3 + c;
c = g3 >> 26;
g3 &= 0x3ffffff;
g4 = h4 + c - (1UL << 26);
/* select h if h < p, or h + -p if h >= p */
mask = (g4 >> ((sizeof(uint32_t) * 8) - 1)) - 1;
g0 &= mask;
g1 &= mask;
g2 &= mask;
g3 &= mask;
g4 &= mask;
mask = ~mask;
h0 = (h0 & mask) | g0;
h1 = (h1 & mask) | g1;
h2 = (h2 & mask) | g2;
h3 = (h3 & mask) | g3;
h4 = (h4 & mask) | g4;
/* h = h % (2^128) */
h0 = ((h0) | (h1 << 26)) & 0xffffffff;
h1 = ((h1 >> 6) | (h2 << 20)) & 0xffffffff;
h2 = ((h2 >> 12) | (h3 << 14)) & 0xffffffff;
h3 = ((h3 >> 18) | (h4 << 8)) & 0xffffffff;
/* mac = (h + nonce) % (2^128) */
f = (uint64_t)h0 + nonce[0];
h0 = (uint32_t)f;
f = (uint64_t)h1 + nonce[1] + (f >> 32);
h1 = (uint32_t)f;
f = (uint64_t)h2 + nonce[2] + (f >> 32);
h2 = (uint32_t)f;
f = (uint64_t)h3 + nonce[3] + (f >> 32);
h3 = (uint32_t)f;
put_unaligned_le32(h0, &mac[0]);
put_unaligned_le32(h1, &mac[4]);
put_unaligned_le32(h2, &mac[8]);
put_unaligned_le32(h3, &mac[12]);
}
static void poly1305_init(struct poly1305_ctx *ctx,
const uint8_t key[POLY1305_KEY_SIZE])
{
ctx->nonce[0] = get_unaligned_le32(&key[16]);
ctx->nonce[1] = get_unaligned_le32(&key[20]);
ctx->nonce[2] = get_unaligned_le32(&key[24]);
ctx->nonce[3] = get_unaligned_le32(&key[28]);
poly1305_init_core(&ctx->state, key);
ctx->num = 0;
}
static void poly1305_update(struct poly1305_ctx *ctx, const uint8_t *input,
size_t len)
{
const size_t num = ctx->num;
size_t rem;
if (num) {
rem = POLY1305_BLOCK_SIZE - num;
if (len < rem) {
memcpy(ctx->data + num, input, len);
ctx->num = num + len;
return;
}
memcpy(ctx->data + num, input, rem);
poly1305_blocks_core(&ctx->state, ctx->data,
POLY1305_BLOCK_SIZE, 1);
input += rem;
len -= rem;
}
rem = len % POLY1305_BLOCK_SIZE;
len -= rem;
if (len >= POLY1305_BLOCK_SIZE) {
poly1305_blocks_core(&ctx->state, input, len, 1);
input += len;
}
if (rem)
memcpy(ctx->data, input, rem);
ctx->num = rem;
}
static void poly1305_final(struct poly1305_ctx *ctx,
uint8_t mac[POLY1305_MAC_SIZE])
{
size_t num = ctx->num;
if (num) {
ctx->data[num++] = 1;
while (num < POLY1305_BLOCK_SIZE)
ctx->data[num++] = 0;
poly1305_blocks_core(&ctx->state, ctx->data,
POLY1305_BLOCK_SIZE, 0);
}
poly1305_emit_core(&ctx->state, mac, ctx->nonce);
explicit_bzero(ctx, sizeof(*ctx));
}
#endif
#ifdef COMPAT_NEED_CHACHA20POLY1305
static const uint8_t pad0[16] = { 0 };
void
chacha20poly1305_encrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
const uint8_t *ad, const size_t ad_len,
const uint64_t nonce,
const uint8_t key[CHACHA20POLY1305_KEY_SIZE])
{
struct poly1305_ctx poly1305_state;
struct chacha20_ctx chacha20_state;
union {
uint8_t block0[POLY1305_KEY_SIZE];
uint64_t lens[2];
} b = { { 0 } };
chacha20_init(&chacha20_state, key, nonce);
chacha20(&chacha20_state, b.block0, b.block0, sizeof(b.block0));
poly1305_init(&poly1305_state, b.block0);
poly1305_update(&poly1305_state, ad, ad_len);
poly1305_update(&poly1305_state, pad0, (0x10 - ad_len) & 0xf);
chacha20(&chacha20_state, dst, src, src_len);
poly1305_update(&poly1305_state, dst, src_len);
poly1305_update(&poly1305_state, pad0, (0x10 - src_len) & 0xf);
b.lens[0] = cpu_to_le64(ad_len);
b.lens[1] = cpu_to_le64(src_len);
poly1305_update(&poly1305_state, (uint8_t *)b.lens, sizeof(b.lens));
poly1305_final(&poly1305_state, dst + src_len);
explicit_bzero(&chacha20_state, sizeof(chacha20_state));
explicit_bzero(&b, sizeof(b));
}
bool
chacha20poly1305_decrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
const uint8_t *ad, const size_t ad_len,
const uint64_t nonce,
const uint8_t key[CHACHA20POLY1305_KEY_SIZE])
{
struct poly1305_ctx poly1305_state;
struct chacha20_ctx chacha20_state;
bool ret;
size_t dst_len;
union {
uint8_t block0[POLY1305_KEY_SIZE];
uint8_t mac[POLY1305_MAC_SIZE];
uint64_t lens[2];
} b = { { 0 } };
if (src_len < POLY1305_MAC_SIZE)
return false;
chacha20_init(&chacha20_state, key, nonce);
chacha20(&chacha20_state, b.block0, b.block0, sizeof(b.block0));
poly1305_init(&poly1305_state, b.block0);
poly1305_update(&poly1305_state, ad, ad_len);
poly1305_update(&poly1305_state, pad0, (0x10 - ad_len) & 0xf);
dst_len = src_len - POLY1305_MAC_SIZE;
poly1305_update(&poly1305_state, src, dst_len);
poly1305_update(&poly1305_state, pad0, (0x10 - dst_len) & 0xf);
b.lens[0] = cpu_to_le64(ad_len);
b.lens[1] = cpu_to_le64(dst_len);
poly1305_update(&poly1305_state, (uint8_t *)b.lens, sizeof(b.lens));
poly1305_final(&poly1305_state, b.mac);
ret = timingsafe_bcmp(b.mac, src + dst_len, POLY1305_MAC_SIZE) == 0;
if (ret)
chacha20(&chacha20_state, dst, src, dst_len);
explicit_bzero(&chacha20_state, sizeof(chacha20_state));
explicit_bzero(&b, sizeof(b));
return ret;
}
void
xchacha20poly1305_encrypt(uint8_t *dst, const uint8_t *src,
const size_t src_len, const uint8_t *ad,
const size_t ad_len,
const uint8_t nonce[XCHACHA20POLY1305_NONCE_SIZE],
const uint8_t key[CHACHA20POLY1305_KEY_SIZE])
{
uint32_t derived_key[CHACHA20_KEY_WORDS];
hchacha20(derived_key, nonce, key);
cpu_to_le32_array(derived_key, ARRAY_SIZE(derived_key));
chacha20poly1305_encrypt(dst, src, src_len, ad, ad_len,
get_unaligned_le64(nonce + 16),
(uint8_t *)derived_key);
explicit_bzero(derived_key, CHACHA20POLY1305_KEY_SIZE);
}
bool
xchacha20poly1305_decrypt(uint8_t *dst, const uint8_t *src,
const size_t src_len, const uint8_t *ad,
const size_t ad_len,
const uint8_t nonce[XCHACHA20POLY1305_NONCE_SIZE],
const uint8_t key[CHACHA20POLY1305_KEY_SIZE])
{
bool ret;
uint32_t derived_key[CHACHA20_KEY_WORDS];
hchacha20(derived_key, nonce, key);
cpu_to_le32_array(derived_key, ARRAY_SIZE(derived_key));
ret = chacha20poly1305_decrypt(dst, src, src_len, ad, ad_len,
get_unaligned_le64(nonce + 16),
(uint8_t *)derived_key);
explicit_bzero(derived_key, CHACHA20POLY1305_KEY_SIZE);
return ret;
}
#endif
#ifdef COMPAT_NEED_CHACHA20POLY1305_MBUF
static inline int
chacha20poly1305_crypt_mbuf(struct mbuf *m0, uint64_t nonce,
const uint8_t key[CHACHA20POLY1305_KEY_SIZE], bool encrypt)
{
struct poly1305_ctx poly1305_state;
struct chacha20_ctx chacha20_state;
uint8_t *buf, mbuf_mac[POLY1305_MAC_SIZE];
size_t len, leftover = 0;
struct mbuf *m;
int ret;
union {
uint32_t stream[CHACHA20_BLOCK_WORDS];
uint8_t block0[POLY1305_KEY_SIZE];
uint8_t mac[POLY1305_MAC_SIZE];
uint64_t lens[2];
} b = { { 0 } };
if (!encrypt) {
if (m0->m_pkthdr.len < POLY1305_MAC_SIZE)
return EMSGSIZE;
m_copydata(m0, m0->m_pkthdr.len - POLY1305_MAC_SIZE, POLY1305_MAC_SIZE, mbuf_mac);
m_adj(m0, -POLY1305_MAC_SIZE);
}
chacha20_init(&chacha20_state, key, nonce);
chacha20(&chacha20_state, b.block0, b.block0, sizeof(b.block0));
poly1305_init(&poly1305_state, b.block0);
for (m = m0; m; m = m->m_next) {
len = m->m_len;
buf = m->m_data;
if (!encrypt)
poly1305_update(&poly1305_state, m->m_data, m->m_len);
if (leftover != 0) {
size_t l = min(len, leftover);
xor_cpy(buf, buf, ((uint8_t *)b.stream) + (CHACHA20_BLOCK_SIZE - leftover), l);
leftover -= l;
buf += l;
len -= l;
}
while (len >= CHACHA20_BLOCK_SIZE) {
chacha20_block(&chacha20_state, b.stream);
xor_cpy(buf, buf, (uint8_t *)b.stream, CHACHA20_BLOCK_SIZE);
buf += CHACHA20_BLOCK_SIZE;
len -= CHACHA20_BLOCK_SIZE;
}
if (len) {
chacha20_block(&chacha20_state, b.stream);
xor_cpy(buf, buf, (uint8_t *)b.stream, len);
leftover = CHACHA20_BLOCK_SIZE - len;
}
if (encrypt)
poly1305_update(&poly1305_state, m->m_data, m->m_len);
}
poly1305_update(&poly1305_state, pad0, (0x10 - m0->m_pkthdr.len) & 0xf);
b.lens[0] = 0;
b.lens[1] = cpu_to_le64(m0->m_pkthdr.len);
poly1305_update(&poly1305_state, (uint8_t *)b.lens, sizeof(b.lens));
poly1305_final(&poly1305_state, b.mac);
if (encrypt)
ret = m_append(m0, POLY1305_MAC_SIZE, b.mac) ? 0 : ENOMEM;
else
ret = timingsafe_bcmp(b.mac, mbuf_mac, POLY1305_MAC_SIZE) == 0 ? 0 : EBADMSG;
explicit_bzero(&chacha20_state, sizeof(chacha20_state));
explicit_bzero(&b, sizeof(b));
return ret;
}
int
chacha20poly1305_encrypt_mbuf(struct mbuf *m, const uint64_t nonce,
const uint8_t key[CHACHA20POLY1305_KEY_SIZE])
{
return chacha20poly1305_crypt_mbuf(m, nonce, key, true);
}
int
chacha20poly1305_decrypt_mbuf(struct mbuf *m, const uint64_t nonce,
const uint8_t key[CHACHA20POLY1305_KEY_SIZE])
{
return chacha20poly1305_crypt_mbuf(m, nonce, key, false);
}
#else
static int
crypto_callback(struct cryptop *crp)
{
return (0);
}
int
chacha20poly1305_encrypt_mbuf(struct mbuf *m, const uint64_t nonce,
const uint8_t key[CHACHA20POLY1305_KEY_SIZE])
{
static const char blank_tag[POLY1305_HASH_LEN];
struct cryptop crp;
int ret;
if (!m_append(m, POLY1305_HASH_LEN, blank_tag))
return (ENOMEM);
crypto_initreq(&crp, chacha20_poly1305_sid);
crp.crp_op = CRYPTO_OP_ENCRYPT | CRYPTO_OP_COMPUTE_DIGEST;
crp.crp_flags = CRYPTO_F_IV_SEPARATE | CRYPTO_F_CBIMM;
crypto_use_mbuf(&crp, m);
crp.crp_payload_length = m->m_pkthdr.len - POLY1305_HASH_LEN;
crp.crp_digest_start = crp.crp_payload_length;
le64enc(crp.crp_iv, nonce);
crp.crp_cipher_key = key;
crp.crp_callback = crypto_callback;
ret = crypto_dispatch(&crp);
crypto_destroyreq(&crp);
return (ret);
}
int
chacha20poly1305_decrypt_mbuf(struct mbuf *m, const uint64_t nonce,
const uint8_t key[CHACHA20POLY1305_KEY_SIZE])
{
struct cryptop crp;
int ret;
if (m->m_pkthdr.len < POLY1305_HASH_LEN)
return (EMSGSIZE);
crypto_initreq(&crp, chacha20_poly1305_sid);
crp.crp_op = CRYPTO_OP_DECRYPT | CRYPTO_OP_VERIFY_DIGEST;
crp.crp_flags = CRYPTO_F_IV_SEPARATE | CRYPTO_F_CBIMM;
crypto_use_mbuf(&crp, m);
crp.crp_payload_length = m->m_pkthdr.len - POLY1305_HASH_LEN;
crp.crp_digest_start = crp.crp_payload_length;
le64enc(crp.crp_iv, nonce);
crp.crp_cipher_key = key;
crp.crp_callback = crypto_callback;
ret = crypto_dispatch(&crp);
crypto_destroyreq(&crp);
if (ret)
return (ret);
m_adj(m, -POLY1305_HASH_LEN);
return (0);
}
#endif
#ifdef COMPAT_NEED_BLAKE2S
static const uint32_t blake2s_iv[8] = {
0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL, 0xA54FF53AUL,
0x510E527FUL, 0x9B05688CUL, 0x1F83D9ABUL, 0x5BE0CD19UL
};
static const uint8_t blake2s_sigma[10][16] = {
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
};
static inline void blake2s_set_lastblock(struct blake2s_state *state)
{
state->f[0] = -1;
}
static inline void blake2s_increment_counter(struct blake2s_state *state,
const uint32_t inc)
{
state->t[0] += inc;
state->t[1] += (state->t[0] < inc);
}
static inline void blake2s_init_param(struct blake2s_state *state,
const uint32_t param)
{
int i;
memset(state, 0, sizeof(*state));
for (i = 0; i < 8; ++i)
state->h[i] = blake2s_iv[i];
state->h[0] ^= param;
}
void blake2s_init(struct blake2s_state *state, const size_t outlen)
{
blake2s_init_param(state, 0x01010000 | outlen);
state->outlen = outlen;
}
void blake2s_init_key(struct blake2s_state *state, const size_t outlen,
const uint8_t *key, const size_t keylen)
{
uint8_t block[BLAKE2S_BLOCK_SIZE] = { 0 };
blake2s_init_param(state, 0x01010000 | keylen << 8 | outlen);
state->outlen = outlen;
memcpy(block, key, keylen);
blake2s_update(state, block, BLAKE2S_BLOCK_SIZE);
explicit_bzero(block, BLAKE2S_BLOCK_SIZE);
}
static inline void blake2s_compress(struct blake2s_state *state,
const uint8_t *block, size_t nblocks,
const uint32_t inc)
{
uint32_t m[16];
uint32_t v[16];
int i;
while (nblocks > 0) {
blake2s_increment_counter(state, inc);
memcpy(m, block, BLAKE2S_BLOCK_SIZE);
le32_to_cpu_array(m, ARRAY_SIZE(m));
memcpy(v, state->h, 32);
v[ 8] = blake2s_iv[0];
v[ 9] = blake2s_iv[1];
v[10] = blake2s_iv[2];
v[11] = blake2s_iv[3];
v[12] = blake2s_iv[4] ^ state->t[0];
v[13] = blake2s_iv[5] ^ state->t[1];
v[14] = blake2s_iv[6] ^ state->f[0];
v[15] = blake2s_iv[7] ^ state->f[1];
#define G(r, i, a, b, c, d) do { \
a += b + m[blake2s_sigma[r][2 * i + 0]]; \
d = ror32(d ^ a, 16); \
c += d; \
b = ror32(b ^ c, 12); \
a += b + m[blake2s_sigma[r][2 * i + 1]]; \
d = ror32(d ^ a, 8); \
c += d; \
b = ror32(b ^ c, 7); \
} while (0)
#define ROUND(r) do { \
G(r, 0, v[0], v[ 4], v[ 8], v[12]); \
G(r, 1, v[1], v[ 5], v[ 9], v[13]); \
G(r, 2, v[2], v[ 6], v[10], v[14]); \
G(r, 3, v[3], v[ 7], v[11], v[15]); \
G(r, 4, v[0], v[ 5], v[10], v[15]); \
G(r, 5, v[1], v[ 6], v[11], v[12]); \
G(r, 6, v[2], v[ 7], v[ 8], v[13]); \
G(r, 7, v[3], v[ 4], v[ 9], v[14]); \
} while (0)
ROUND(0);
ROUND(1);
ROUND(2);
ROUND(3);
ROUND(4);
ROUND(5);
ROUND(6);
ROUND(7);
ROUND(8);
ROUND(9);
#undef G
#undef ROUND
for (i = 0; i < 8; ++i)
state->h[i] ^= v[i] ^ v[i + 8];
block += BLAKE2S_BLOCK_SIZE;
--nblocks;
}
}
void blake2s_update(struct blake2s_state *state, const uint8_t *in, size_t inlen)
{
const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
if (!inlen)
return;
if (inlen > fill) {
memcpy(state->buf + state->buflen, in, fill);
blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
state->buflen = 0;
in += fill;
inlen -= fill;
}
if (inlen > BLAKE2S_BLOCK_SIZE) {
const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
/* Hash one less (full) block than strictly possible */
blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
}
memcpy(state->buf + state->buflen, in, inlen);
state->buflen += inlen;
}
void blake2s_final(struct blake2s_state *state, uint8_t *out)
{
blake2s_set_lastblock(state);
memset(state->buf + state->buflen, 0,
BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
blake2s_compress(state, state->buf, 1, state->buflen);
cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
memcpy(out, state->h, state->outlen);
explicit_bzero(state, sizeof(*state));
}
#endif
#ifdef COMPAT_NEED_CURVE25519
/* Below here is fiat's implementation of x25519.
*
* Copyright (C) 2015-2016 The fiat-crypto Authors.
* Copyright (C) 2018-2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*
* This is a machine-generated formally verified implementation of Curve25519
* ECDH from: <https://github.com/mit-plv/fiat-crypto>. Though originally
* machine generated, it has been tweaked to be suitable for use in the kernel.
* It is optimized for 32-bit machines and machines that cannot work efficiently
* with 128-bit integer types.
*/
/* fe means field element. Here the field is \Z/(2^255-19). An element t,
* entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
* t[3]+2^102 t[4]+...+2^230 t[9].
* fe limbs are bounded by 1.125*2^26,1.125*2^25,1.125*2^26,1.125*2^25,etc.
* Multiplication and carrying produce fe from fe_loose.
*/
typedef struct fe { uint32_t v[10]; } fe;
/* fe_loose limbs are bounded by 3.375*2^26,3.375*2^25,3.375*2^26,3.375*2^25,etc
* Addition and subtraction produce fe_loose from (fe, fe).
*/
typedef struct fe_loose { uint32_t v[10]; } fe_loose;
static inline void fe_frombytes_impl(uint32_t h[10], const uint8_t *s)
{
/* Ignores top bit of s. */
uint32_t a0 = get_unaligned_le32(s);
uint32_t a1 = get_unaligned_le32(s+4);
uint32_t a2 = get_unaligned_le32(s+8);
uint32_t a3 = get_unaligned_le32(s+12);
uint32_t a4 = get_unaligned_le32(s+16);
uint32_t a5 = get_unaligned_le32(s+20);
uint32_t a6 = get_unaligned_le32(s+24);
uint32_t a7 = get_unaligned_le32(s+28);
h[0] = a0&((1<<26)-1); /* 26 used, 32-26 left. 26 */
h[1] = (a0>>26) | ((a1&((1<<19)-1))<< 6); /* (32-26) + 19 = 6+19 = 25 */
h[2] = (a1>>19) | ((a2&((1<<13)-1))<<13); /* (32-19) + 13 = 13+13 = 26 */
h[3] = (a2>>13) | ((a3&((1<< 6)-1))<<19); /* (32-13) + 6 = 19+ 6 = 25 */
h[4] = (a3>> 6); /* (32- 6) = 26 */
h[5] = a4&((1<<25)-1); /* 25 */
h[6] = (a4>>25) | ((a5&((1<<19)-1))<< 7); /* (32-25) + 19 = 7+19 = 26 */
h[7] = (a5>>19) | ((a6&((1<<12)-1))<<13); /* (32-19) + 12 = 13+12 = 25 */
h[8] = (a6>>12) | ((a7&((1<< 6)-1))<<20); /* (32-12) + 6 = 20+ 6 = 26 */
h[9] = (a7>> 6)&((1<<25)-1); /* 25 */
}
static inline void fe_frombytes(fe *h, const uint8_t *s)
{
fe_frombytes_impl(h->v, s);
}
static inline uint8_t /*bool*/
addcarryx_u25(uint8_t /*bool*/ c, uint32_t a, uint32_t b, uint32_t *low)
{
/* This function extracts 25 bits of result and 1 bit of carry
* (26 total), so a 32-bit intermediate is sufficient.
*/
uint32_t x = a + b + c;
*low = x & ((1 << 25) - 1);
return (x >> 25) & 1;
}
static inline uint8_t /*bool*/
addcarryx_u26(uint8_t /*bool*/ c, uint32_t a, uint32_t b, uint32_t *low)
{
/* This function extracts 26 bits of result and 1 bit of carry
* (27 total), so a 32-bit intermediate is sufficient.
*/
uint32_t x = a + b + c;
*low = x & ((1 << 26) - 1);
return (x >> 26) & 1;
}
static inline uint8_t /*bool*/
subborrow_u25(uint8_t /*bool*/ c, uint32_t a, uint32_t b, uint32_t *low)
{
/* This function extracts 25 bits of result and 1 bit of borrow
* (26 total), so a 32-bit intermediate is sufficient.
*/
uint32_t x = a - b - c;
*low = x & ((1 << 25) - 1);
return x >> 31;
}
static inline uint8_t /*bool*/
subborrow_u26(uint8_t /*bool*/ c, uint32_t a, uint32_t b, uint32_t *low)
{
/* This function extracts 26 bits of result and 1 bit of borrow
*(27 total), so a 32-bit intermediate is sufficient.
*/
uint32_t x = a - b - c;
*low = x & ((1 << 26) - 1);
return x >> 31;
}
static inline uint32_t cmovznz32(uint32_t t, uint32_t z, uint32_t nz)
{
t = -!!t; /* all set if nonzero, 0 if 0 */
return (t&nz) | ((~t)&z);
}
static inline void fe_freeze(uint32_t out[10], const uint32_t in1[10])
{
const uint32_t x17 = in1[9];
const uint32_t x18 = in1[8];
const uint32_t x16 = in1[7];
const uint32_t x14 = in1[6];
const uint32_t x12 = in1[5];
const uint32_t x10 = in1[4];
const uint32_t x8 = in1[3];
const uint32_t x6 = in1[2];
const uint32_t x4 = in1[1];
const uint32_t x2 = in1[0];
uint32_t x20; uint8_t/*bool*/ x21 = subborrow_u26(0x0, x2, 0x3ffffed, &x20);
uint32_t x23; uint8_t/*bool*/ x24 = subborrow_u25(x21, x4, 0x1ffffff, &x23);
uint32_t x26; uint8_t/*bool*/ x27 = subborrow_u26(x24, x6, 0x3ffffff, &x26);
uint32_t x29; uint8_t/*bool*/ x30 = subborrow_u25(x27, x8, 0x1ffffff, &x29);
uint32_t x32; uint8_t/*bool*/ x33 = subborrow_u26(x30, x10, 0x3ffffff, &x32);
uint32_t x35; uint8_t/*bool*/ x36 = subborrow_u25(x33, x12, 0x1ffffff, &x35);
uint32_t x38; uint8_t/*bool*/ x39 = subborrow_u26(x36, x14, 0x3ffffff, &x38);
uint32_t x41; uint8_t/*bool*/ x42 = subborrow_u25(x39, x16, 0x1ffffff, &x41);
uint32_t x44; uint8_t/*bool*/ x45 = subborrow_u26(x42, x18, 0x3ffffff, &x44);
uint32_t x47; uint8_t/*bool*/ x48 = subborrow_u25(x45, x17, 0x1ffffff, &x47);
uint32_t x49 = cmovznz32(x48, 0x0, 0xffffffff);
uint32_t x50 = (x49 & 0x3ffffed);
uint32_t x52; uint8_t/*bool*/ x53 = addcarryx_u26(0x0, x20, x50, &x52);
uint32_t x54 = (x49 & 0x1ffffff);
uint32_t x56; uint8_t/*bool*/ x57 = addcarryx_u25(x53, x23, x54, &x56);
uint32_t x58 = (x49 & 0x3ffffff);
uint32_t x60; uint8_t/*bool*/ x61 = addcarryx_u26(x57, x26, x58, &x60);
uint32_t x62 = (x49 & 0x1ffffff);
uint32_t x64; uint8_t/*bool*/ x65 = addcarryx_u25(x61, x29, x62, &x64);
uint32_t x66 = (x49 & 0x3ffffff);
uint32_t x68; uint8_t/*bool*/ x69 = addcarryx_u26(x65, x32, x66, &x68);
uint32_t x70 = (x49 & 0x1ffffff);
uint32_t x72; uint8_t/*bool*/ x73 = addcarryx_u25(x69, x35, x70, &x72);
uint32_t x74 = (x49 & 0x3ffffff);
uint32_t x76; uint8_t/*bool*/ x77 = addcarryx_u26(x73, x38, x74, &x76);
uint32_t x78 = (x49 & 0x1ffffff);
uint32_t x80; uint8_t/*bool*/ x81 = addcarryx_u25(x77, x41, x78, &x80);
uint32_t x82 = (x49 & 0x3ffffff);
uint32_t x84; uint8_t/*bool*/ x85 = addcarryx_u26(x81, x44, x82, &x84);
uint32_t x86 = (x49 & 0x1ffffff);
uint32_t x88; addcarryx_u25(x85, x47, x86, &x88);
out[0] = x52;
out[1] = x56;
out[2] = x60;
out[3] = x64;
out[4] = x68;
out[5] = x72;
out[6] = x76;
out[7] = x80;
out[8] = x84;
out[9] = x88;
}
static inline void fe_tobytes(uint8_t s[32], const fe *f)
{
uint32_t h[10];
fe_freeze(h, f->v);
s[0] = h[0] >> 0;
s[1] = h[0] >> 8;
s[2] = h[0] >> 16;
s[3] = (h[0] >> 24) | (h[1] << 2);
s[4] = h[1] >> 6;
s[5] = h[1] >> 14;
s[6] = (h[1] >> 22) | (h[2] << 3);
s[7] = h[2] >> 5;
s[8] = h[2] >> 13;
s[9] = (h[2] >> 21) | (h[3] << 5);
s[10] = h[3] >> 3;
s[11] = h[3] >> 11;
s[12] = (h[3] >> 19) | (h[4] << 6);
s[13] = h[4] >> 2;
s[14] = h[4] >> 10;
s[15] = h[4] >> 18;
s[16] = h[5] >> 0;
s[17] = h[5] >> 8;
s[18] = h[5] >> 16;
s[19] = (h[5] >> 24) | (h[6] << 1);
s[20] = h[6] >> 7;
s[21] = h[6] >> 15;
s[22] = (h[6] >> 23) | (h[7] << 3);
s[23] = h[7] >> 5;
s[24] = h[7] >> 13;
s[25] = (h[7] >> 21) | (h[8] << 4);
s[26] = h[8] >> 4;
s[27] = h[8] >> 12;
s[28] = (h[8] >> 20) | (h[9] << 6);
s[29] = h[9] >> 2;
s[30] = h[9] >> 10;
s[31] = h[9] >> 18;
}
/* h = f */
static inline void fe_copy(fe *h, const fe *f)
{
memmove(h, f, sizeof(uint32_t) * 10);
}
static inline void fe_copy_lt(fe_loose *h, const fe *f)
{
memmove(h, f, sizeof(uint32_t) * 10);
}
/* h = 0 */
static inline void fe_0(fe *h)
{
memset(h, 0, sizeof(uint32_t) * 10);
}
/* h = 1 */
static inline void fe_1(fe *h)
{
memset(h, 0, sizeof(uint32_t) * 10);
h->v[0] = 1;
}
static void fe_add_impl(uint32_t out[10], const uint32_t in1[10], const uint32_t in2[10])
{
const uint32_t x20 = in1[9];
const uint32_t x21 = in1[8];
const uint32_t x19 = in1[7];
const uint32_t x17 = in1[6];
const uint32_t x15 = in1[5];
const uint32_t x13 = in1[4];
const uint32_t x11 = in1[3];
const uint32_t x9 = in1[2];
const uint32_t x7 = in1[1];
const uint32_t x5 = in1[0];
const uint32_t x38 = in2[9];
const uint32_t x39 = in2[8];
const uint32_t x37 = in2[7];
const uint32_t x35 = in2[6];
const uint32_t x33 = in2[5];
const uint32_t x31 = in2[4];
const uint32_t x29 = in2[3];
const uint32_t x27 = in2[2];
const uint32_t x25 = in2[1];
const uint32_t x23 = in2[0];
out[0] = (x5 + x23);
out[1] = (x7 + x25);
out[2] = (x9 + x27);
out[3] = (x11 + x29);
out[4] = (x13 + x31);
out[5] = (x15 + x33);
out[6] = (x17 + x35);
out[7] = (x19 + x37);
out[8] = (x21 + x39);
out[9] = (x20 + x38);
}
/* h = f + g
* Can overlap h with f or g.
*/
static inline void fe_add(fe_loose *h, const fe *f, const fe *g)
{
fe_add_impl(h->v, f->v, g->v);
}
static void fe_sub_impl(uint32_t out[10], const uint32_t in1[10], const uint32_t in2[10])
{
const uint32_t x20 = in1[9];
const uint32_t x21 = in1[8];
const uint32_t x19 = in1[7];
const uint32_t x17 = in1[6];
const uint32_t x15 = in1[5];
const uint32_t x13 = in1[4];
const uint32_t x11 = in1[3];
const uint32_t x9 = in1[2];
const uint32_t x7 = in1[1];
const uint32_t x5 = in1[0];
const uint32_t x38 = in2[9];
const uint32_t x39 = in2[8];
const uint32_t x37 = in2[7];
const uint32_t x35 = in2[6];
const uint32_t x33 = in2[5];
const uint32_t x31 = in2[4];
const uint32_t x29 = in2[3];
const uint32_t x27 = in2[2];
const uint32_t x25 = in2[1];
const uint32_t x23 = in2[0];
out[0] = ((0x7ffffda + x5) - x23);
out[1] = ((0x3fffffe + x7) - x25);
out[2] = ((0x7fffffe + x9) - x27);
out[3] = ((0x3fffffe + x11) - x29);
out[4] = ((0x7fffffe + x13) - x31);
out[5] = ((0x3fffffe + x15) - x33);
out[6] = ((0x7fffffe + x17) - x35);
out[7] = ((0x3fffffe + x19) - x37);
out[8] = ((0x7fffffe + x21) - x39);
out[9] = ((0x3fffffe + x20) - x38);
}
/* h = f - g
* Can overlap h with f or g.
*/
static inline void fe_sub(fe_loose *h, const fe *f, const fe *g)
{
fe_sub_impl(h->v, f->v, g->v);
}
static void fe_mul_impl(uint32_t out[10], const uint32_t in1[10], const uint32_t in2[10])
{
const uint32_t x20 = in1[9];
const uint32_t x21 = in1[8];
const uint32_t x19 = in1[7];
const uint32_t x17 = in1[6];
const uint32_t x15 = in1[5];
const uint32_t x13 = in1[4];
const uint32_t x11 = in1[3];
const uint32_t x9 = in1[2];
const uint32_t x7 = in1[1];
const uint32_t x5 = in1[0];
const uint32_t x38 = in2[9];
const uint32_t x39 = in2[8];
const uint32_t x37 = in2[7];
const uint32_t x35 = in2[6];
const uint32_t x33 = in2[5];
const uint32_t x31 = in2[4];
const uint32_t x29 = in2[3];
const uint32_t x27 = in2[2];
const uint32_t x25 = in2[1];
const uint32_t x23 = in2[0];
uint64_t x40 = ((uint64_t)x23 * x5);
uint64_t x41 = (((uint64_t)x23 * x7) + ((uint64_t)x25 * x5));
uint64_t x42 = ((((uint64_t)(0x2 * x25) * x7) + ((uint64_t)x23 * x9)) + ((uint64_t)x27 * x5));
uint64_t x43 = (((((uint64_t)x25 * x9) + ((uint64_t)x27 * x7)) + ((uint64_t)x23 * x11)) + ((uint64_t)x29 * x5));
uint64_t x44 = (((((uint64_t)x27 * x9) + (0x2 * (((uint64_t)x25 * x11) + ((uint64_t)x29 * x7)))) + ((uint64_t)x23 * x13)) + ((uint64_t)x31 * x5));
uint64_t x45 = (((((((uint64_t)x27 * x11) + ((uint64_t)x29 * x9)) + ((uint64_t)x25 * x13)) + ((uint64_t)x31 * x7)) + ((uint64_t)x23 * x15)) + ((uint64_t)x33 * x5));
uint64_t x46 = (((((0x2 * ((((uint64_t)x29 * x11) + ((uint64_t)x25 * x15)) + ((uint64_t)x33 * x7))) + ((uint64_t)x27 * x13)) + ((uint64_t)x31 * x9)) + ((uint64_t)x23 * x17)) + ((uint64_t)x35 * x5));
uint64_t x47 = (((((((((uint64_t)x29 * x13) + ((uint64_t)x31 * x11)) + ((uint64_t)x27 * x15)) + ((uint64_t)x33 * x9)) + ((uint64_t)x25 * x17)) + ((uint64_t)x35 * x7)) + ((uint64_t)x23 * x19)) + ((uint64_t)x37 * x5));
uint64_t x48 = (((((((uint64_t)x31 * x13) + (0x2 * (((((uint64_t)x29 * x15) + ((uint64_t)x33 * x11)) + ((uint64_t)x25 * x19)) + ((uint64_t)x37 * x7)))) + ((uint64_t)x27 * x17)) + ((uint64_t)x35 * x9)) + ((uint64_t)x23 * x21)) + ((uint64_t)x39 * x5));
uint64_t x49 = (((((((((((uint64_t)x31 * x15) + ((uint64_t)x33 * x13)) + ((uint64_t)x29 * x17)) + ((uint64_t)x35 * x11)) + ((uint64_t)x27 * x19)) + ((uint64_t)x37 * x9)) + ((uint64_t)x25 * x21)) + ((uint64_t)x39 * x7)) + ((uint64_t)x23 * x20)) + ((uint64_t)x38 * x5));
uint64_t x50 = (((((0x2 * ((((((uint64_t)x33 * x15) + ((uint64_t)x29 * x19)) + ((uint64_t)x37 * x11)) + ((uint64_t)x25 * x20)) + ((uint64_t)x38 * x7))) + ((uint64_t)x31 * x17)) + ((uint64_t)x35 * x13)) + ((uint64_t)x27 * x21)) + ((uint64_t)x39 * x9));
uint64_t x51 = (((((((((uint64_t)x33 * x17) + ((uint64_t)x35 * x15)) + ((uint64_t)x31 * x19)) + ((uint64_t)x37 * x13)) + ((uint64_t)x29 * x21)) + ((uint64_t)x39 * x11)) + ((uint64_t)x27 * x20)) + ((uint64_t)x38 * x9));
uint64_t x52 = (((((uint64_t)x35 * x17) + (0x2 * (((((uint64_t)x33 * x19) + ((uint64_t)x37 * x15)) + ((uint64_t)x29 * x20)) + ((uint64_t)x38 * x11)))) + ((uint64_t)x31 * x21)) + ((uint64_t)x39 * x13));
uint64_t x53 = (((((((uint64_t)x35 * x19) + ((uint64_t)x37 * x17)) + ((uint64_t)x33 * x21)) + ((uint64_t)x39 * x15)) + ((uint64_t)x31 * x20)) + ((uint64_t)x38 * x13));
uint64_t x54 = (((0x2 * ((((uint64_t)x37 * x19) + ((uint64_t)x33 * x20)) + ((uint64_t)x38 * x15))) + ((uint64_t)x35 * x21)) + ((uint64_t)x39 * x17));
uint64_t x55 = (((((uint64_t)x37 * x21) + ((uint64_t)x39 * x19)) + ((uint64_t)x35 * x20)) + ((uint64_t)x38 * x17));
uint64_t x56 = (((uint64_t)x39 * x21) + (0x2 * (((uint64_t)x37 * x20) + ((uint64_t)x38 * x19))));
uint64_t x57 = (((uint64_t)x39 * x20) + ((uint64_t)x38 * x21));
uint64_t x58 = ((uint64_t)(0x2 * x38) * x20);
uint64_t x59 = (x48 + (x58 << 0x4));
uint64_t x60 = (x59 + (x58 << 0x1));
uint64_t x61 = (x60 + x58);
uint64_t x62 = (x47 + (x57 << 0x4));
uint64_t x63 = (x62 + (x57 << 0x1));
uint64_t x64 = (x63 + x57);
uint64_t x65 = (x46 + (x56 << 0x4));
uint64_t x66 = (x65 + (x56 << 0x1));
uint64_t x67 = (x66 + x56);
uint64_t x68 = (x45 + (x55 << 0x4));
uint64_t x69 = (x68 + (x55 << 0x1));
uint64_t x70 = (x69 + x55);
uint64_t x71 = (x44 + (x54 << 0x4));
uint64_t x72 = (x71 + (x54 << 0x1));
uint64_t x73 = (x72 + x54);
uint64_t x74 = (x43 + (x53 << 0x4));
uint64_t x75 = (x74 + (x53 << 0x1));
uint64_t x76 = (x75 + x53);
uint64_t x77 = (x42 + (x52 << 0x4));
uint64_t x78 = (x77 + (x52 << 0x1));
uint64_t x79 = (x78 + x52);
uint64_t x80 = (x41 + (x51 << 0x4));
uint64_t x81 = (x80 + (x51 << 0x1));
uint64_t x82 = (x81 + x51);
uint64_t x83 = (x40 + (x50 << 0x4));
uint64_t x84 = (x83 + (x50 << 0x1));
uint64_t x85 = (x84 + x50);
uint64_t x86 = (x85 >> 0x1a);
uint32_t x87 = ((uint32_t)x85 & 0x3ffffff);
uint64_t x88 = (x86 + x82);
uint64_t x89 = (x88 >> 0x19);
uint32_t x90 = ((uint32_t)x88 & 0x1ffffff);
uint64_t x91 = (x89 + x79);
uint64_t x92 = (x91 >> 0x1a);
uint32_t x93 = ((uint32_t)x91 & 0x3ffffff);
uint64_t x94 = (x92 + x76);
uint64_t x95 = (x94 >> 0x19);
uint32_t x96 = ((uint32_t)x94 & 0x1ffffff);
uint64_t x97 = (x95 + x73);
uint64_t x98 = (x97 >> 0x1a);
uint32_t x99 = ((uint32_t)x97 & 0x3ffffff);
uint64_t x100 = (x98 + x70);
uint64_t x101 = (x100 >> 0x19);
uint32_t x102 = ((uint32_t)x100 & 0x1ffffff);
uint64_t x103 = (x101 + x67);
uint64_t x104 = (x103 >> 0x1a);
uint32_t x105 = ((uint32_t)x103 & 0x3ffffff);
uint64_t x106 = (x104 + x64);
uint64_t x107 = (x106 >> 0x19);
uint32_t x108 = ((uint32_t)x106 & 0x1ffffff);
uint64_t x109 = (x107 + x61);
uint64_t x110 = (x109 >> 0x1a);
uint32_t x111 = ((uint32_t)x109 & 0x3ffffff);
uint64_t x112 = (x110 + x49);
uint64_t x113 = (x112 >> 0x19);
uint32_t x114 = ((uint32_t)x112 & 0x1ffffff);
uint64_t x115 = (x87 + (0x13 * x113));
uint32_t x116 = (uint32_t) (x115 >> 0x1a);
uint32_t x117 = ((uint32_t)x115 & 0x3ffffff);
uint32_t x118 = (x116 + x90);
uint32_t x119 = (x118 >> 0x19);
uint32_t x120 = (x118 & 0x1ffffff);
out[0] = x117;
out[1] = x120;
out[2] = (x119 + x93);
out[3] = x96;
out[4] = x99;
out[5] = x102;
out[6] = x105;
out[7] = x108;
out[8] = x111;
out[9] = x114;
}
static inline void fe_mul_ttt(fe *h, const fe *f, const fe *g)
{
fe_mul_impl(h->v, f->v, g->v);
}
static inline void fe_mul_tlt(fe *h, const fe_loose *f, const fe *g)
{
fe_mul_impl(h->v, f->v, g->v);
}
static inline void
fe_mul_tll(fe *h, const fe_loose *f, const fe_loose *g)
{
fe_mul_impl(h->v, f->v, g->v);
}
static void fe_sqr_impl(uint32_t out[10], const uint32_t in1[10])
{
const uint32_t x17 = in1[9];
const uint32_t x18 = in1[8];
const uint32_t x16 = in1[7];
const uint32_t x14 = in1[6];
const uint32_t x12 = in1[5];
const uint32_t x10 = in1[4];
const uint32_t x8 = in1[3];
const uint32_t x6 = in1[2];
const uint32_t x4 = in1[1];
const uint32_t x2 = in1[0];
uint64_t x19 = ((uint64_t)x2 * x2);
uint64_t x20 = ((uint64_t)(0x2 * x2) * x4);
uint64_t x21 = (0x2 * (((uint64_t)x4 * x4) + ((uint64_t)x2 * x6)));
uint64_t x22 = (0x2 * (((uint64_t)x4 * x6) + ((uint64_t)x2 * x8)));
uint64_t x23 = ((((uint64_t)x6 * x6) + ((uint64_t)(0x4 * x4) * x8)) + ((uint64_t)(0x2 * x2) * x10));
uint64_t x24 = (0x2 * ((((uint64_t)x6 * x8) + ((uint64_t)x4 * x10)) + ((uint64_t)x2 * x12)));
uint64_t x25 = (0x2 * (((((uint64_t)x8 * x8) + ((uint64_t)x6 * x10)) + ((uint64_t)x2 * x14)) + ((uint64_t)(0x2 * x4) * x12)));
uint64_t x26 = (0x2 * (((((uint64_t)x8 * x10) + ((uint64_t)x6 * x12)) + ((uint64_t)x4 * x14)) + ((uint64_t)x2 * x16)));
uint64_t x27 = (((uint64_t)x10 * x10) + (0x2 * ((((uint64_t)x6 * x14) + ((uint64_t)x2 * x18)) + (0x2 * (((uint64_t)x4 * x16) + ((uint64_t)x8 * x12))))));
uint64_t x28 = (0x2 * ((((((uint64_t)x10 * x12) + ((uint64_t)x8 * x14)) + ((uint64_t)x6 * x16)) + ((uint64_t)x4 * x18)) + ((uint64_t)x2 * x17)));
uint64_t x29 = (0x2 * (((((uint64_t)x12 * x12) + ((uint64_t)x10 * x14)) + ((uint64_t)x6 * x18)) + (0x2 * (((uint64_t)x8 * x16) + ((uint64_t)x4 * x17)))));
uint64_t x30 = (0x2 * (((((uint64_t)x12 * x14) + ((uint64_t)x10 * x16)) + ((uint64_t)x8 * x18)) + ((uint64_t)x6 * x17)));
uint64_t x31 = (((uint64_t)x14 * x14) + (0x2 * (((uint64_t)x10 * x18) + (0x2 * (((uint64_t)x12 * x16) + ((uint64_t)x8 * x17))))));
uint64_t x32 = (0x2 * ((((uint64_t)x14 * x16) + ((uint64_t)x12 * x18)) + ((uint64_t)x10 * x17)));
uint64_t x33 = (0x2 * ((((uint64_t)x16 * x16) + ((uint64_t)x14 * x18)) + ((uint64_t)(0x2 * x12) * x17)));
uint64_t x34 = (0x2 * (((uint64_t)x16 * x18) + ((uint64_t)x14 * x17)));
uint64_t x35 = (((uint64_t)x18 * x18) + ((uint64_t)(0x4 * x16) * x17));
uint64_t x36 = ((uint64_t)(0x2 * x18) * x17);
uint64_t x37 = ((uint64_t)(0x2 * x17) * x17);
uint64_t x38 = (x27 + (x37 << 0x4));
uint64_t x39 = (x38 + (x37 << 0x1));
uint64_t x40 = (x39 + x37);
uint64_t x41 = (x26 + (x36 << 0x4));
uint64_t x42 = (x41 + (x36 << 0x1));
uint64_t x43 = (x42 + x36);
uint64_t x44 = (x25 + (x35 << 0x4));
uint64_t x45 = (x44 + (x35 << 0x1));
uint64_t x46 = (x45 + x35);
uint64_t x47 = (x24 + (x34 << 0x4));
uint64_t x48 = (x47 + (x34 << 0x1));
uint64_t x49 = (x48 + x34);
uint64_t x50 = (x23 + (x33 << 0x4));
uint64_t x51 = (x50 + (x33 << 0x1));
uint64_t x52 = (x51 + x33);
uint64_t x53 = (x22 + (x32 << 0x4));
uint64_t x54 = (x53 + (x32 << 0x1));
uint64_t x55 = (x54 + x32);
uint64_t x56 = (x21 + (x31 << 0x4));
uint64_t x57 = (x56 + (x31 << 0x1));
uint64_t x58 = (x57 + x31);
uint64_t x59 = (x20 + (x30 << 0x4));
uint64_t x60 = (x59 + (x30 << 0x1));
uint64_t x61 = (x60 + x30);
uint64_t x62 = (x19 + (x29 << 0x4));
uint64_t x63 = (x62 + (x29 << 0x1));
uint64_t x64 = (x63 + x29);
uint64_t x65 = (x64 >> 0x1a);
uint32_t x66 = ((uint32_t)x64 & 0x3ffffff);
uint64_t x67 = (x65 + x61);
uint64_t x68 = (x67 >> 0x19);
uint32_t x69 = ((uint32_t)x67 & 0x1ffffff);
uint64_t x70 = (x68 + x58);
uint64_t x71 = (x70 >> 0x1a);
uint32_t x72 = ((uint32_t)x70 & 0x3ffffff);
uint64_t x73 = (x71 + x55);
uint64_t x74 = (x73 >> 0x19);
uint32_t x75 = ((uint32_t)x73 & 0x1ffffff);
uint64_t x76 = (x74 + x52);
uint64_t x77 = (x76 >> 0x1a);
uint32_t x78 = ((uint32_t)x76 & 0x3ffffff);
uint64_t x79 = (x77 + x49);
uint64_t x80 = (x79 >> 0x19);
uint32_t x81 = ((uint32_t)x79 & 0x1ffffff);
uint64_t x82 = (x80 + x46);
uint64_t x83 = (x82 >> 0x1a);
uint32_t x84 = ((uint32_t)x82 & 0x3ffffff);
uint64_t x85 = (x83 + x43);
uint64_t x86 = (x85 >> 0x19);
uint32_t x87 = ((uint32_t)x85 & 0x1ffffff);
uint64_t x88 = (x86 + x40);
uint64_t x89 = (x88 >> 0x1a);
uint32_t x90 = ((uint32_t)x88 & 0x3ffffff);
uint64_t x91 = (x89 + x28);
uint64_t x92 = (x91 >> 0x19);
uint32_t x93 = ((uint32_t)x91 & 0x1ffffff);
uint64_t x94 = (x66 + (0x13 * x92));
uint32_t x95 = (uint32_t) (x94 >> 0x1a);
uint32_t x96 = ((uint32_t)x94 & 0x3ffffff);
uint32_t x97 = (x95 + x69);
uint32_t x98 = (x97 >> 0x19);
uint32_t x99 = (x97 & 0x1ffffff);
out[0] = x96;
out[1] = x99;
out[2] = (x98 + x72);
out[3] = x75;
out[4] = x78;
out[5] = x81;
out[6] = x84;
out[7] = x87;
out[8] = x90;
out[9] = x93;
}
static inline void fe_sq_tl(fe *h, const fe_loose *f)
{
fe_sqr_impl(h->v, f->v);
}
static inline void fe_sq_tt(fe *h, const fe *f)
{
fe_sqr_impl(h->v, f->v);
}
static inline void fe_loose_invert(fe *out, const fe_loose *z)
{
fe t0;
fe t1;
fe t2;
fe t3;
int i;
fe_sq_tl(&t0, z);
fe_sq_tt(&t1, &t0);
for (i = 1; i < 2; ++i)
fe_sq_tt(&t1, &t1);
fe_mul_tlt(&t1, z, &t1);
fe_mul_ttt(&t0, &t0, &t1);
fe_sq_tt(&t2, &t0);
fe_mul_ttt(&t1, &t1, &t2);
fe_sq_tt(&t2, &t1);
for (i = 1; i < 5; ++i)
fe_sq_tt(&t2, &t2);
fe_mul_ttt(&t1, &t2, &t1);
fe_sq_tt(&t2, &t1);
for (i = 1; i < 10; ++i)
fe_sq_tt(&t2, &t2);
fe_mul_ttt(&t2, &t2, &t1);
fe_sq_tt(&t3, &t2);
for (i = 1; i < 20; ++i)
fe_sq_tt(&t3, &t3);
fe_mul_ttt(&t2, &t3, &t2);
fe_sq_tt(&t2, &t2);
for (i = 1; i < 10; ++i)
fe_sq_tt(&t2, &t2);
fe_mul_ttt(&t1, &t2, &t1);
fe_sq_tt(&t2, &t1);
for (i = 1; i < 50; ++i)
fe_sq_tt(&t2, &t2);
fe_mul_ttt(&t2, &t2, &t1);
fe_sq_tt(&t3, &t2);
for (i = 1; i < 100; ++i)
fe_sq_tt(&t3, &t3);
fe_mul_ttt(&t2, &t3, &t2);
fe_sq_tt(&t2, &t2);
for (i = 1; i < 50; ++i)
fe_sq_tt(&t2, &t2);
fe_mul_ttt(&t1, &t2, &t1);
fe_sq_tt(&t1, &t1);
for (i = 1; i < 5; ++i)
fe_sq_tt(&t1, &t1);
fe_mul_ttt(out, &t1, &t0);
}
static inline void fe_invert(fe *out, const fe *z)
{
fe_loose l;
fe_copy_lt(&l, z);
fe_loose_invert(out, &l);
}
/* Replace (f,g) with (g,f) if b == 1;
* replace (f,g) with (f,g) if b == 0.
*
* Preconditions: b in {0,1}
*/
static inline void fe_cswap(fe *f, fe *g, unsigned int b)
{
unsigned i;
b = 0 - b;
for (i = 0; i < 10; i++) {
uint32_t x = f->v[i] ^ g->v[i];
x &= b;
f->v[i] ^= x;
g->v[i] ^= x;
}
}
/* NOTE: based on fiat-crypto fe_mul, edited for in2=121666, 0, 0.*/
static inline void fe_mul_121666_impl(uint32_t out[10], const uint32_t in1[10])
{
const uint32_t x20 = in1[9];
const uint32_t x21 = in1[8];
const uint32_t x19 = in1[7];
const uint32_t x17 = in1[6];
const uint32_t x15 = in1[5];
const uint32_t x13 = in1[4];
const uint32_t x11 = in1[3];
const uint32_t x9 = in1[2];
const uint32_t x7 = in1[1];
const uint32_t x5 = in1[0];
const uint32_t x38 = 0;
const uint32_t x39 = 0;
const uint32_t x37 = 0;
const uint32_t x35 = 0;
const uint32_t x33 = 0;
const uint32_t x31 = 0;
const uint32_t x29 = 0;
const uint32_t x27 = 0;
const uint32_t x25 = 0;
const uint32_t x23 = 121666;
uint64_t x40 = ((uint64_t)x23 * x5);
uint64_t x41 = (((uint64_t)x23 * x7) + ((uint64_t)x25 * x5));
uint64_t x42 = ((((uint64_t)(0x2 * x25) * x7) + ((uint64_t)x23 * x9)) + ((uint64_t)x27 * x5));
uint64_t x43 = (((((uint64_t)x25 * x9) + ((uint64_t)x27 * x7)) + ((uint64_t)x23 * x11)) + ((uint64_t)x29 * x5));
uint64_t x44 = (((((uint64_t)x27 * x9) + (0x2 * (((uint64_t)x25 * x11) + ((uint64_t)x29 * x7)))) + ((uint64_t)x23 * x13)) + ((uint64_t)x31 * x5));
uint64_t x45 = (((((((uint64_t)x27 * x11) + ((uint64_t)x29 * x9)) + ((uint64_t)x25 * x13)) + ((uint64_t)x31 * x7)) + ((uint64_t)x23 * x15)) + ((uint64_t)x33 * x5));
uint64_t x46 = (((((0x2 * ((((uint64_t)x29 * x11) + ((uint64_t)x25 * x15)) + ((uint64_t)x33 * x7))) + ((uint64_t)x27 * x13)) + ((uint64_t)x31 * x9)) + ((uint64_t)x23 * x17)) + ((uint64_t)x35 * x5));
uint64_t x47 = (((((((((uint64_t)x29 * x13) + ((uint64_t)x31 * x11)) + ((uint64_t)x27 * x15)) + ((uint64_t)x33 * x9)) + ((uint64_t)x25 * x17)) + ((uint64_t)x35 * x7)) + ((uint64_t)x23 * x19)) + ((uint64_t)x37 * x5));
uint64_t x48 = (((((((uint64_t)x31 * x13) + (0x2 * (((((uint64_t)x29 * x15) + ((uint64_t)x33 * x11)) + ((uint64_t)x25 * x19)) + ((uint64_t)x37 * x7)))) + ((uint64_t)x27 * x17)) + ((uint64_t)x35 * x9)) + ((uint64_t)x23 * x21)) + ((uint64_t)x39 * x5));
uint64_t x49 = (((((((((((uint64_t)x31 * x15) + ((uint64_t)x33 * x13)) + ((uint64_t)x29 * x17)) + ((uint64_t)x35 * x11)) + ((uint64_t)x27 * x19)) + ((uint64_t)x37 * x9)) + ((uint64_t)x25 * x21)) + ((uint64_t)x39 * x7)) + ((uint64_t)x23 * x20)) + ((uint64_t)x38 * x5));
uint64_t x50 = (((((0x2 * ((((((uint64_t)x33 * x15) + ((uint64_t)x29 * x19)) + ((uint64_t)x37 * x11)) + ((uint64_t)x25 * x20)) + ((uint64_t)x38 * x7))) + ((uint64_t)x31 * x17)) + ((uint64_t)x35 * x13)) + ((uint64_t)x27 * x21)) + ((uint64_t)x39 * x9));
uint64_t x51 = (((((((((uint64_t)x33 * x17) + ((uint64_t)x35 * x15)) + ((uint64_t)x31 * x19)) + ((uint64_t)x37 * x13)) + ((uint64_t)x29 * x21)) + ((uint64_t)x39 * x11)) + ((uint64_t)x27 * x20)) + ((uint64_t)x38 * x9));
uint64_t x52 = (((((uint64_t)x35 * x17) + (0x2 * (((((uint64_t)x33 * x19) + ((uint64_t)x37 * x15)) + ((uint64_t)x29 * x20)) + ((uint64_t)x38 * x11)))) + ((uint64_t)x31 * x21)) + ((uint64_t)x39 * x13));
uint64_t x53 = (((((((uint64_t)x35 * x19) + ((uint64_t)x37 * x17)) + ((uint64_t)x33 * x21)) + ((uint64_t)x39 * x15)) + ((uint64_t)x31 * x20)) + ((uint64_t)x38 * x13));
uint64_t x54 = (((0x2 * ((((uint64_t)x37 * x19) + ((uint64_t)x33 * x20)) + ((uint64_t)x38 * x15))) + ((uint64_t)x35 * x21)) + ((uint64_t)x39 * x17));
uint64_t x55 = (((((uint64_t)x37 * x21) + ((uint64_t)x39 * x19)) + ((uint64_t)x35 * x20)) + ((uint64_t)x38 * x17));
uint64_t x56 = (((uint64_t)x39 * x21) + (0x2 * (((uint64_t)x37 * x20) + ((uint64_t)x38 * x19))));
uint64_t x57 = (((uint64_t)x39 * x20) + ((uint64_t)x38 * x21));
uint64_t x58 = ((uint64_t)(0x2 * x38) * x20);
uint64_t x59 = (x48 + (x58 << 0x4));
uint64_t x60 = (x59 + (x58 << 0x1));
uint64_t x61 = (x60 + x58);
uint64_t x62 = (x47 + (x57 << 0x4));
uint64_t x63 = (x62 + (x57 << 0x1));
uint64_t x64 = (x63 + x57);
uint64_t x65 = (x46 + (x56 << 0x4));
uint64_t x66 = (x65 + (x56 << 0x1));
uint64_t x67 = (x66 + x56);
uint64_t x68 = (x45 + (x55 << 0x4));
uint64_t x69 = (x68 + (x55 << 0x1));
uint64_t x70 = (x69 + x55);
uint64_t x71 = (x44 + (x54 << 0x4));
uint64_t x72 = (x71 + (x54 << 0x1));
uint64_t x73 = (x72 + x54);
uint64_t x74 = (x43 + (x53 << 0x4));
uint64_t x75 = (x74 + (x53 << 0x1));
uint64_t x76 = (x75 + x53);
uint64_t x77 = (x42 + (x52 << 0x4));
uint64_t x78 = (x77 + (x52 << 0x1));
uint64_t x79 = (x78 + x52);
uint64_t x80 = (x41 + (x51 << 0x4));
uint64_t x81 = (x80 + (x51 << 0x1));
uint64_t x82 = (x81 + x51);
uint64_t x83 = (x40 + (x50 << 0x4));
uint64_t x84 = (x83 + (x50 << 0x1));
uint64_t x85 = (x84 + x50);
uint64_t x86 = (x85 >> 0x1a);
uint32_t x87 = ((uint32_t)x85 & 0x3ffffff);
uint64_t x88 = (x86 + x82);
uint64_t x89 = (x88 >> 0x19);
uint32_t x90 = ((uint32_t)x88 & 0x1ffffff);
uint64_t x91 = (x89 + x79);
uint64_t x92 = (x91 >> 0x1a);
uint32_t x93 = ((uint32_t)x91 & 0x3ffffff);
uint64_t x94 = (x92 + x76);
uint64_t x95 = (x94 >> 0x19);
uint32_t x96 = ((uint32_t)x94 & 0x1ffffff);
uint64_t x97 = (x95 + x73);
uint64_t x98 = (x97 >> 0x1a);
uint32_t x99 = ((uint32_t)x97 & 0x3ffffff);
uint64_t x100 = (x98 + x70);
uint64_t x101 = (x100 >> 0x19);
uint32_t x102 = ((uint32_t)x100 & 0x1ffffff);
uint64_t x103 = (x101 + x67);
uint64_t x104 = (x103 >> 0x1a);
uint32_t x105 = ((uint32_t)x103 & 0x3ffffff);
uint64_t x106 = (x104 + x64);
uint64_t x107 = (x106 >> 0x19);
uint32_t x108 = ((uint32_t)x106 & 0x1ffffff);
uint64_t x109 = (x107 + x61);
uint64_t x110 = (x109 >> 0x1a);
uint32_t x111 = ((uint32_t)x109 & 0x3ffffff);
uint64_t x112 = (x110 + x49);
uint64_t x113 = (x112 >> 0x19);
uint32_t x114 = ((uint32_t)x112 & 0x1ffffff);
uint64_t x115 = (x87 + (0x13 * x113));
uint32_t x116 = (uint32_t) (x115 >> 0x1a);
uint32_t x117 = ((uint32_t)x115 & 0x3ffffff);
uint32_t x118 = (x116 + x90);
uint32_t x119 = (x118 >> 0x19);
uint32_t x120 = (x118 & 0x1ffffff);
out[0] = x117;
out[1] = x120;
out[2] = (x119 + x93);
out[3] = x96;
out[4] = x99;
out[5] = x102;
out[6] = x105;
out[7] = x108;
out[8] = x111;
out[9] = x114;
}
static inline void fe_mul121666(fe *h, const fe_loose *f)
{
fe_mul_121666_impl(h->v, f->v);
}
static const uint8_t curve25519_null_point[CURVE25519_KEY_SIZE];
bool curve25519(uint8_t out[CURVE25519_KEY_SIZE],
const uint8_t scalar[CURVE25519_KEY_SIZE],
const uint8_t point[CURVE25519_KEY_SIZE])
{
fe x1, x2, z2, x3, z3;
fe_loose x2l, z2l, x3l;
unsigned swap = 0;
int pos;
uint8_t e[32];
memcpy(e, scalar, 32);
curve25519_clamp_secret(e);
/* The following implementation was transcribed to Coq and proven to
* correspond to unary scalar multiplication in affine coordinates given
* that x1 != 0 is the x coordinate of some point on the curve. It was
* also checked in Coq that doing a ladderstep with x1 = x3 = 0 gives
* z2' = z3' = 0, and z2 = z3 = 0 gives z2' = z3' = 0. The statement was
* quantified over the underlying field, so it applies to Curve25519
* itself and the quadratic twist of Curve25519. It was not proven in
* Coq that prime-field arithmetic correctly simulates extension-field
* arithmetic on prime-field values. The decoding of the byte array
* representation of e was not considered.
*
* Specification of Montgomery curves in affine coordinates:
* <https://github.com/mit-plv/fiat-crypto/blob/2456d821825521f7e03e65882cc3521795b0320f/src/Spec/MontgomeryCurve.v#L27>
*
* Proof that these form a group that is isomorphic to a Weierstrass
* curve:
* <https://github.com/mit-plv/fiat-crypto/blob/2456d821825521f7e03e65882cc3521795b0320f/src/Curves/Montgomery/AffineProofs.v#L35>
*
* Coq transcription and correctness proof of the loop
* (where scalarbits=255):
* <https://github.com/mit-plv/fiat-crypto/blob/2456d821825521f7e03e65882cc3521795b0320f/src/Curves/Montgomery/XZ.v#L118>
* <https://github.com/mit-plv/fiat-crypto/blob/2456d821825521f7e03e65882cc3521795b0320f/src/Curves/Montgomery/XZProofs.v#L278>
* preconditions: 0 <= e < 2^255 (not necessarily e < order),
* fe_invert(0) = 0
*/
fe_frombytes(&x1, point);
fe_1(&x2);
fe_0(&z2);
fe_copy(&x3, &x1);
fe_1(&z3);
for (pos = 254; pos >= 0; --pos) {
fe tmp0, tmp1;
fe_loose tmp0l, tmp1l;
/* loop invariant as of right before the test, for the case
* where x1 != 0:
* pos >= -1; if z2 = 0 then x2 is nonzero; if z3 = 0 then x3
* is nonzero
* let r := e >> (pos+1) in the following equalities of
* projective points:
* to_xz (r*P) === if swap then (x3, z3) else (x2, z2)
* to_xz ((r+1)*P) === if swap then (x2, z2) else (x3, z3)
* x1 is the nonzero x coordinate of the nonzero
* point (r*P-(r+1)*P)
*/
unsigned b = 1 & (e[pos / 8] >> (pos & 7));
swap ^= b;
fe_cswap(&x2, &x3, swap);
fe_cswap(&z2, &z3, swap);
swap = b;
/* Coq transcription of ladderstep formula (called from
* transcribed loop):
* <https://github.com/mit-plv/fiat-crypto/blob/2456d821825521f7e03e65882cc3521795b0320f/src/Curves/Montgomery/XZ.v#L89>
* <https://github.com/mit-plv/fiat-crypto/blob/2456d821825521f7e03e65882cc3521795b0320f/src/Curves/Montgomery/XZProofs.v#L131>
* x1 != 0 <https://github.com/mit-plv/fiat-crypto/blob/2456d821825521f7e03e65882cc3521795b0320f/src/Curves/Montgomery/XZProofs.v#L217>
* x1 = 0 <https://github.com/mit-plv/fiat-crypto/blob/2456d821825521f7e03e65882cc3521795b0320f/src/Curves/Montgomery/XZProofs.v#L147>
*/
fe_sub(&tmp0l, &x3, &z3);
fe_sub(&tmp1l, &x2, &z2);
fe_add(&x2l, &x2, &z2);
fe_add(&z2l, &x3, &z3);
fe_mul_tll(&z3, &tmp0l, &x2l);
fe_mul_tll(&z2, &z2l, &tmp1l);
fe_sq_tl(&tmp0, &tmp1l);
fe_sq_tl(&tmp1, &x2l);
fe_add(&x3l, &z3, &z2);
fe_sub(&z2l, &z3, &z2);
fe_mul_ttt(&x2, &tmp1, &tmp0);
fe_sub(&tmp1l, &tmp1, &tmp0);
fe_sq_tl(&z2, &z2l);
fe_mul121666(&z3, &tmp1l);
fe_sq_tl(&x3, &x3l);
fe_add(&tmp0l, &tmp0, &z3);
fe_mul_ttt(&z3, &x1, &z2);
fe_mul_tll(&z2, &tmp1l, &tmp0l);
}
/* here pos=-1, so r=e, so to_xz (e*P) === if swap then (x3, z3)
* else (x2, z2)
*/
fe_cswap(&x2, &x3, swap);
fe_cswap(&z2, &z3, swap);
fe_invert(&z2, &z2);
fe_mul_ttt(&x2, &x2, &z2);
fe_tobytes(out, &x2);
explicit_bzero(&x1, sizeof(x1));
explicit_bzero(&x2, sizeof(x2));
explicit_bzero(&z2, sizeof(z2));
explicit_bzero(&x3, sizeof(x3));
explicit_bzero(&z3, sizeof(z3));
explicit_bzero(&x2l, sizeof(x2l));
explicit_bzero(&z2l, sizeof(z2l));
explicit_bzero(&x3l, sizeof(x3l));
explicit_bzero(&e, sizeof(e));
return timingsafe_bcmp(out, curve25519_null_point, CURVE25519_KEY_SIZE) != 0;
}
#endif
int
crypto_init(void)
{
#ifndef COMPAT_NEED_CHACHA20POLY1305_MBUF
struct crypto_session_params csp = {
.csp_mode = CSP_MODE_AEAD,
.csp_ivlen = sizeof(uint64_t),
.csp_cipher_alg = CRYPTO_CHACHA20_POLY1305,
.csp_cipher_klen = CHACHA20POLY1305_KEY_SIZE,
.csp_flags = CSP_F_SEPARATE_AAD | CSP_F_SEPARATE_OUTPUT
};
int ret = crypto_newsession(&chacha20_poly1305_sid, &csp, CRYPTOCAP_F_SOFTWARE);
if (ret != 0)
return (ret);
#endif
return (0);
}
void
crypto_deinit(void)
{
#ifndef COMPAT_NEED_CHACHA20POLY1305_MBUF
crypto_freesession(chacha20_poly1305_sid);
#endif
}