void ep_rhs(fp_t rhs, const ep_t p) {
fp_t t0;
fp_t t1;
fp_null(t0);
fp_null(t1);
TRY {
fp_new(t0);
fp_new(t1);
/* t0 = x1^2. */
fp_sqr(t0, p->x);
/* t1 = x1^3. */
fp_mul(t1, t0, p->x);
/* t1 = x1^3 + a * x1 + b. */
switch (ep_curve_opt_a()) {
case OPT_ZERO:
break;
case OPT_ONE:
fp_add(t1, t1, p->x);
break;
#if FP_RDC != MONTY
case OPT_DIGIT:
fp_mul_dig(t0, p->x, ep_curve_get_a()[0]);
fp_add(t1, t1, t0);
break;
#endif
default:
fp_mul(t0, p->x, ep_curve_get_a());
fp_add(t1, t1, t0);
break;
}
switch (ep_curve_opt_b()) {
case OPT_ZERO:
break;
case OPT_ONE:
fp_add_dig(t1, t1, 1);
break;
#if FP_RDC != MONTY
case OPT_DIGIT:
fp_add_dig(t1, t1, ep_curve_get_b()[0]);
break;
#endif
default:
fp_add(t1, t1, ep_curve_get_b());
break;
}
fp_copy(rhs, t1);
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
fp_free(t0);
fp_free(t1);
}
}
int fp2_srt(fp2_t c, fp2_t a) {
int r = 0;
fp_t t1;
fp_t t2;
fp_t t3;
fp_null(t1);
fp_null(t2);
fp_null(t3);
TRY {
fp_new(t1);
fp_new(t2);
fp_new(t3);
/* t1 = a[0]^2 - u^2 * a[1]^2 */
fp_sqr(t1, a[0]);
fp_sqr(t2, a[1]);
for (int i = -1; i > fp_prime_get_qnr(); i--) {
fp_add(t1, t1, t2);
}
for (int i = 0; i <= fp_prime_get_qnr(); i++) {
fp_sub(t1, t1, t2);
}
fp_add(t1, t1, t2);
if (fp_srt(t2, t1)) {
/* t1 = (a_0 + sqrt(t1)) / 2 */
fp_add(t1, a[0], t2);
fp_set_dig(t3, 2);
fp_inv(t3, t3);
fp_mul(t1, t1, t3);
if (!fp_srt(t3, t1)) {
/* t1 = (a_0 - sqrt(t1)) / 2 */
fp_sub(t1, a[0], t2);
fp_set_dig(t3, 2);
fp_inv(t3, t3);
fp_mul(t1, t1, t3);
fp_srt(t3, t1);
}
/* c_0 = sqrt(t1) */
fp_copy(c[0], t3);
/* c_1 = a_1 / (2 * sqrt(t1)) */
fp_dbl(t3, t3);
fp_inv(t3, t3);
fp_mul(c[1], a[1], t3);
r = 1;
}
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t1);
fp_free(t2);
fp_free(t3);
}
return r;
}
/**
* Normalizes a point represented in projective coordinates.
*
* @param r - the result.
* @param p - the point to normalize.
*/
static void ep_norm_imp(ep_t r, const ep_t p, int inverted) {
if (!p->norm) {
fp_t t0, t1;
fp_null(t0);
fp_null(t1);
TRY {
fp_new(t0);
fp_new(t1);
if (inverted) {
fp_copy(t1, p->z);
} else {
fp_inv(t1, p->z);
}
fp_sqr(t0, t1);
fp_mul(r->x, p->x, t0);
fp_mul(t0, t0, t1);
fp_mul(r->y, p->y, t0);
fp_set_dig(r->z, 1);
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t0);
fp_free(t1);
}
}
void fp2_sqr_basic(fp2_t c, fp2_t a) {
fp_t t0, t1, t2;
fp_null(t0);
fp_null(t1);
fp_null(t2);
TRY {
fp_new(t0);
fp_new(t1);
fp_new(t2);
/* t0 = (a_0 + a_1). */
fp_add(t0, a[0], a[1]);
/* t1 = (a_0 - a_1). */
fp_sub(t1, a[0], a[1]);
/* t1 = a_0 + u^2 * a_1. */
for (int i = -1; i > fp_prime_get_qnr(); i--) {
fp_sub(t1, t1, a[1]);
}
for (int i = 0; i <= fp_prime_get_qnr(); i++) {
fp_add(t1, t1, a[1]);
}
if (fp_prime_get_qnr() == -1) {
/* t2 = 2 * a_0. */
fp_dbl(t2, a[0]);
/* c_1 = 2 * a_0 * a_1. */
fp_mul(c[1], t2, a[1]);
/* c_0 = a_0^2 + a_1^2 * u^2. */
fp_mul(c[0], t0, t1);
} else {
/* c_1 = a_0 * a_1. */
fp_mul(c[1], a[0], a[1]);
/* c_0 = a_0^2 + a_1^2 * u^2. */
fp_mul(c[0], t0, t1);
for (int i = -1; i > fp_prime_get_qnr(); i--) {
fp_add(c[0], c[0], c[1]);
}
for (int i = 0; i <= fp_prime_get_qnr(); i++) {
fp_sub(c[0], c[0], c[1]);
}
/* c_1 = 2 * a_0 * a_1. */
fp_dbl(c[1], c[1]);
}
/* c = c_0 + c_1 * u. */
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t0);
fp_free(t1);
fp_free(t2);
}
}
void fp2_inv(fp2_t c, fp2_t a) {
fp_t t0, t1;
fp_null(t0);
fp_null(t1);
TRY {
fp_new(t0);
fp_new(t1);
/* t0 = a_0^2, t1 = a_1^2. */
fp_sqr(t0, a[0]);
fp_sqr(t1, a[1]);
/* t1 = 1/(a_0^2 + a_1^2). */
#ifndef FP_QNRES
if (fp_prime_get_qnr() != -1) {
if (fp_prime_get_qnr() == -2) {
fp_dbl(t1, t1);
fp_add(t0, t0, t1);
} else {
if (fp_prime_get_qnr() < 0) {
fp_mul_dig(t1, t1, -fp_prime_get_qnr());
fp_add(t0, t0, t1);
} else {
fp_mul_dig(t1, t1, fp_prime_get_qnr());
fp_sub(t0, t0, t1);
}
}
} else {
fp_add(t0, t0, t1);
}
#else
fp_add(t0, t0, t1);
#endif
fp_inv(t1, t0);
/* c_0 = a_0/(a_0^2 + a_1^2). */
fp_mul(c[0], a[0], t1);
/* c_1 = - a_1/(a_0^2 + a_1^2). */
fp_mul(c[1], a[1], t1);
fp_neg(c[1], c[1]);
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t0);
fp_free(t1);
}
}
int ep_upk(ep_t r, const ep_t p) {
fp_t t;
int result = 0;
fp_null(t);
TRY {
fp_new(t);
ep_rhs(t, p);
/* t0 = sqrt(x1^3 + a * x1 + b). */
result = fp_srt(t, t);
if (result) {
/* Verify if least significant bit of the result matches the
* compressed y-coordinate. */
if (fp_get_bit(t, 0) != fp_get_bit(p->y, 0)) {
fp_neg(t, t);
}
fp_copy(r->x, p->x);
fp_copy(r->y, t);
fp_set_dig(r->z, 1);
r->norm = 1;
}
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t);
}
return result;
}
void ed_norm_sim(ed_t *r, const ed_t *t, int n) {
int i;
fp_t a[n];
for (i = 0; i < n; i++) {
fp_null(a[i]);
}
TRY {
for (i = 0; i < n; i++) {
fp_new(a[i]);
fp_copy(a[i], t[i]->z);
}
fp_inv_sim(a, (const fp_t *)a, n);
for (i = 0; i < n; i++) {
fp_mul(r[i]->x, t[i]->x, a[i]);
fp_mul(r[i]->y, t[i]->y, a[i]);
#if ED_ADD == EXTND
fp_mul(r[i]->t, t[i]->t, a[i]);
#endif
fp_set_dig(r[i]->z, 1);
}
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
for (i = 0; i < n; i++) {
fp_free(a[i]);
}
}
}
FileContextsResult patch_file_contexts(const char *source_path,
const char *target_path)
{
ContextsList list;
autoclose::file fp_old(autoclose::fopen(source_path, "rb"));
if (!fp_old) {
return FileContextsResult::ERRNO;
}
if (!load_file(fp_old.get(), &list)) {
return FileContextsResult::PARSE_ERROR;
}
fp_old.reset();
autoclose::file fp_new(autoclose::fopen(target_path, "w"));
if (!fp_new) {
return FileContextsResult::ERRNO;
}
for (auto const &pair : list) {
auto const &context = pair.first;
auto const ®ex = pair.second;
if (fputs(regex.c_str(), fp_new.get()) == EOF
|| fputc(' ', fp_new.get()) == EOF
|| fputs(context.c_str(), fp_new.get()) == EOF
|| fputc('\n', fp_new.get()) == EOF) {
return FileContextsResult::ERRNO;
}
}
return FileContextsResult::OK;
}
int fp2_upk(fp2_t c, fp2_t a) {
int result, b = fp_get_bit(a[1], 0);
fp_t t;
fp_null(t);
TRY {
fp_new(t);
/* a_0^2 + a_1^2 = 1, thus a_1^2 = 1 - a_0^2. */
fp_sqr(t, a[0]);
fp_sub_dig(t, t, 1);
fp_neg(t, t);
/* a1 = sqrt(a_0^2). */
result = fp_srt(t, t);
if (result) {
/* Verify if least significant bit of the result matches the
* compressed second coordinate. */
if (fp_get_bit(t, 0) != b) {
fp_neg(t, t);
}
fp_copy(c[0], a[0]);
fp_copy(c[1], t);
}
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
fp_free(t);
}
return result;
}
void fp2_mul_art(fp2_t c, fp2_t a) {
fp_t t;
fp_null(t);
TRY {
fp_new(t);
#ifdef FP_QNRES
/* (a_0 + a_1 * i) * i = -a_1 + a_0 * i. */
fp_copy(t, a[0]);
fp_neg(c[0], a[1]);
fp_copy(c[1], t);
#else
/* (a_0 + a_1 * u) * u = (a_1 * u^2) + a_0 * u. */
fp_copy(t, a[0]);
fp_neg(c[0], a[1]);
for (int i = -1; i > fp_prime_get_qnr(); i--) {
fp_sub(c[0], c[0], a[1]);
}
fp_copy(c[1], t);
#endif
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t);
}
}
int fp_cmp_dig(const fp_t a, dig_t b) {
#if FP_RDC == MONTY
fp_t t;
int r = CMP_EQ;
fp_null(t);
TRY {
fp_new(t);
fp_prime_conv_dig(t, b);
r = fp_cmp(a, t);
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
fp_free(t);
}
return r;
#else
for (int i = 1; i < FP_DIGS; i++) {
if (a[i] > 0) {
return CMP_GT;
}
}
return fp_cmp1_low(a[0], b);
#endif
}
/**
* Normalizes a point represented in projective coordinates.
*
* @param r - the result.
* @param p - the point to normalize.
*/
void ed_norm(ed_t r, const ed_t p) {
if (ed_is_infty(p)) {
ed_set_infty(r);
return;
}
if (fp_cmp_dig(p->z, 1) == CMP_EQ) {
/* If the point is represented in affine coordinates, we just copy it. */
ed_copy(r, p);
} else {
fp_t z_inv;
fp_null(z_inv);
fp_new(z_inv);
fp_inv(z_inv, p->z);
fp_mul(r->x, p->x, z_inv);
fp_mul(r->y, p->y, z_inv);
#if ED_ADD == EXTND
fp_mul(r->t, p->t, z_inv);
#endif
fp_set_dig(r->z, 1);
fp_free(z_inv);
}
}
/*
* Uncompress twisted Edwards curve point.
*/
int ed_upk(ed_t r, const ed_t p) {
int result = 1;
fp_t t;
TRY {
fp_new(t);
fp_copy(r->y, p->y);
ed_recover_x(t, p->y, core_get()->ed_d, core_get()->ed_a);
if (fp_get_bit(t, 0) != fp_get_bit(p->x, 0)) {
fp_neg(t, t);
}
fp_copy(r->x, t);
#if ED_ADD == EXTND
fp_mul(r->t, r->x, r->y);
#endif
fp_set_dig(r->z, 1);
r->norm = 1;
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t);
}
return result;
}
void ep_curve_init(void) {
ctx_t *ctx = core_get();
#ifdef EP_PRECO
for (int i = 0; i < RELIC_EP_TABLE; i++) {
ctx->ep_ptr[i] = &(ctx->ep_pre[i]);
}
#endif
#if ALLOC == STATIC
fp_new(ctx->ep_g.x);
fp_new(ctx->ep_g.y);
fp_new(ctx->ep_g.z);
#ifdef EP_PRECO
for (int i = 0; i < RELIC_EP_TABLE; i++) {
fp_new(ctx->ep_pre[i].x);
fp_new(ctx->ep_pre[i].y);
fp_new(ctx->ep_pre[i].z);
}
#endif
#endif
ep_set_infty(&ctx->ep_g);
bn_init(&ctx->ep_r, FP_DIGS);
bn_init(&ctx->ep_h, FP_DIGS);
#if defined(EP_ENDOM) && (EP_MUL == LWNAF || EP_FIX == COMBS || EP_FIX == LWNAF || !defined(STRIP))
for (int i = 0; i < 3; i++) {
bn_init(&(ctx->ep_v1[i]), FP_DIGS);
bn_init(&(ctx->ep_v2[i]), FP_DIGS);
}
#endif
}
void fp_exp_monty(fp_t c, const fp_t a, const bn_t b) {
fp_t t[2];
fp_null(t[0]);
fp_null(t[1]);
if (bn_is_zero(b)) {
fp_set_dig(c, 1);
return;
}
TRY {
fp_new(t[0]);
fp_new(t[1]);
fp_set_dig(t[0], 1);
fp_copy(t[1], a);
for (int i = bn_bits(b) - 1; i >= 0; i--) {
int j = bn_get_bit(b, i);
dv_swap_cond(t[0], t[1], FP_DIGS, j ^ 1);
fp_mul(t[0], t[0], t[1]);
fp_sqr(t[1], t[1]);
dv_swap_cond(t[0], t[1], FP_DIGS, j ^ 1);
}
if (bn_sign(b) == BN_NEG) {
fp_inv(c, t[0]);
} else {
fp_copy(c, t[0]);
}
} CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t[1]);
fp_free(t[0]);
}
}
static bool fix_file_contexts()
{
autoclose::file fp_old(autoclose::fopen("/file_contexts", "rb"));
if (!fp_old) {
if (errno == ENOENT) {
return true;
} else {
LOGE("Failed to open /file_contexts: %s", strerror(errno));
return false;
}
}
autoclose::file fp_new(autoclose::fopen("/file_contexts.new", "wb"));
if (!fp_new) {
LOGE("Failed to open /file_contexts.new for writing: %s",
strerror(errno));
return false;
}
char *line = nullptr;
size_t len = 0;
ssize_t read = 0;
auto free_line = util::finally([&] {
free(line);
});
while ((read = getline(&line, &len, fp_old.get())) >= 0) {
if (util::starts_with(line, "/data/media(")
&& !strstr(line, "<<none>>")) {
continue;
}
if (fwrite(line, 1, read, fp_new.get()) != (std::size_t) read) {
LOGE("Failed to write to /file_contexts.new: %s", strerror(errno));
return false;
}
}
static const char *new_contexts =
"\n"
"/data/media <<none>>\n"
"/data/media/[0-9]+(/.*)? <<none>>\n"
"/raw(/.*)? <<none>>\n"
"/data/multiboot(/.*)? <<none>>\n"
"/cache/multiboot(/.*)? <<none>>\n"
"/system/multiboot(/.*)? <<none>>\n";
fputs(new_contexts, fp_new.get());
return replace_file("/file_contexts", "/file_contexts.new");
}
int ed_affine_is_valid(const fp_t x, const fp_t y) {
fp_t tmpFP0;
fp_t tmpFP1;
fp_t tmpFP2;
fp_null(tmpFP0);
fp_null(tmpFP1);
fp_null(tmpFP2);
int r = 0;
TRY {
fp_new(tmpFP0);
fp_new(tmpFP1);
fp_new(tmpFP2);
// a * X^2 + Y^2 - 1 - d * X^2 * Y^2 =?= 0
fp_sqr(tmpFP0, x);
fp_mul(tmpFP0, core_get()->ed_a, tmpFP0);
fp_sqr(tmpFP1, y);
fp_add(tmpFP1, tmpFP0, tmpFP1);
fp_sub_dig(tmpFP1, tmpFP1, 1);
fp_sqr(tmpFP0, x);
fp_mul(tmpFP0, core_get()->ed_d, tmpFP0);
fp_sqr(tmpFP2, y);
fp_mul(tmpFP2, tmpFP0, tmpFP2);
fp_sub(tmpFP0, tmpFP1, tmpFP2);
r = fp_is_zero(tmpFP0);
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
fp_free(tmpFP0);
fp_free(tmpFP1);
fp_free(tmpFP2);
}
return r;
}
int ed_is_valid(const ed_t p) {
ed_t t;
#if ED_ADD == EXTND
fp_t x_times_y;
#endif
int r = 0;
ed_null(t);
#if ED_ADD == EXTND
fp_null(x_times_y);
#endif
if (fp_is_zero(p->z)) {
r = 0;
} else {
TRY {
#if ED_ADD == EXTND
fp_new(x_times_y);
#endif
ed_new(t);
ed_norm(t, p);
// check t coordinate
#if ED_ADD == PROJC
r = ed_affine_is_valid(t->x, t->y);
#elif ED_ADD == EXTND
fp_mul(x_times_y, t->x, t->y);
if (fp_cmp(x_times_y, t->t) != CMP_EQ) {
r = 0;
} else {
r = ed_affine_is_valid(t->x, t->y);
}
#endif
// if (r == 0) {
// util_printf("\n\n(X, Y, T, Z) = \n");
// ed_print(p);
// }
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
#if ED_ADD == EXTND
fp_free(x_times_y);
#endif
ed_free(t);
}
}
return r;
}
static bool fix_arter97()
{
const char *path = "/init.mount.sh";
const char *path_new = "/init.mount.sh.new";
const char *fstab = "/fstab.samsungexynos7420";
struct stat sb;
if (stat(path, &sb) < 0 || stat(fstab, &sb) < 0) {
return true;
}
autoclose::file fp(autoclose::fopen(path, "r"));
if (!fp) {
LOGE("Failed to open %s for reading: %s", path, strerror(errno));
return false;
}
autoclose::file fp_new(autoclose::fopen(path_new, "w"));
if (!fp_new) {
LOGE("Failed to open %s for writing: %s", path_new, strerror(errno));
return false;
}
// Strip everything from /init.mount.sh except for the shebang line
{
char *line = nullptr;
size_t len = 0;
ssize_t read = 0;
auto free_line = util::finally([&] {
free(line);
});
while ((read = getline(&line, &len, fp.get())) >= 0) {
fputs(line, fp_new.get());
break;
}
}
fp.reset();
fp_new.reset();
replace_file(path, path_new);
return true;
}
int fp_cmp_dig(const fp_t a, dig_t b) {
fp_t t;
int r = RLC_EQ;
fp_null(t);
TRY {
fp_new(t);
fp_prime_conv_dig(t, b);
r = fp_cmp(a, t);
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
fp_free(t);
}
return r;
}
int ed_is_infty(const ed_t p) {
assert(!fp_is_zero(p->z));
int ret = 0;
fp_t norm_y;
fp_null(norm_y);
fp_new(norm_y);
fp_inv(norm_y, p->z);
fp_mul(norm_y, p->y, norm_y);
if (fp_cmp_dig(norm_y, 1) == CMP_EQ && fp_is_zero(p->x)) {
ret = 1;
}
fp_free(norm_y);
return ret;
}
/**
* Detects an optimization based on the curve coefficients.
*
* @param[out] opt - the resulting optimization.
* @param[in] a - the curve coefficient.
*/
static void detect_opt(int *opt, fp_t a) {
fp_t t;
fp_null(t);
TRY {
fp_new(t);
fp_prime_conv_dig(t, 3);
fp_neg(t, t);
if (fp_cmp(a, t) == CMP_EQ) {
*opt = OPT_MINUS3;
} else {
if (fp_is_zero(a)) {
*opt = OPT_ZERO;
} else {
fp_set_dig(t, 1);
if (fp_cmp_dig(a, 1) == CMP_EQ) {
*opt = OPT_ONE;
} else {
if (fp_cmp_dig(a, 2) == CMP_EQ) {
*opt = OPT_TWO;
} else {
if (fp_bits(a) <= FP_DIGIT) {
*opt = OPT_DIGIT;
} else {
*opt = RELIC_OPT_NONE;
}
}
}
}
}
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t);
}
}
void fp3_mul_art(fp3_t c, fp3_t a) {
fp_t t;
fp_null(t);
TRY {
fp_new(t);
/* (a_0 + a_1 * u + a_1 * u^2) * u = a_0 * u + a_1 * u^2 + a_1 * u^3. */
fp_copy(t, a[0]);
fp_dbl(c[0], a[2]);
fp_neg(c[0], c[0]);
fp_copy(c[2], a[1]);
fp_copy(c[1], t);
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t);
}
}
void fp_exp_basic(fp_t c, const fp_t a, const bn_t b) {
int i, l;
fp_t r;
fp_null(r);
if (bn_is_zero(b)) {
fp_set_dig(c, 1);
return;
}
TRY {
fp_new(r);
l = bn_bits(b);
fp_copy(r, a);
for (i = l - 2; i >= 0; i--) {
fp_sqr(r, r);
if (bn_get_bit(b, i)) {
fp_mul(r, r, a);
}
}
if (bn_sign(b) == BN_NEG) {
fp_inv(c, r);
} else {
fp_copy(c, r);
}
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(r);
}
}
void pp_dbl_k2_basic(fp2_t l, ep_t r, ep_t p, ep_t q) {
fp_t s;
ep_t t;
fp_null(s);
ep_null(t);
TRY {
fp_new(s);
ep_new(t);
ep_copy(t, p);
ep_dbl_slp_basic(r, s, p);
fp_add(l[0], t->x, q->x);
fp_mul(l[0], l[0], s);
fp_sub(l[0], t->y, l[0]);
fp_copy(l[1], q->y);
} CATCH_ANY {
THROW(ERR_CAUGHT);
} FINALLY {
fp_free(s);
ep_free(t);
}
}
void ep_param_set(int param) {
int plain = 0, endom = 0, super = 0;
char str[2 * FP_BYTES + 2];
fp_t a, b, beta;
ep_t g;
bn_t r, h, lamb;
fp_null(a);
fp_null(b);
fp_null(beta);
bn_null(lamb);
ep_null(g);
bn_null(r);
bn_null(h);
TRY {
fp_new(a);
fp_new(b);
fp_new(beta);
bn_new(lamb);
ep_new(g);
bn_new(r);
bn_new(h);
core_get()->ep_id = 0;
switch (param) {
#if defined(EP_ENDOM) && FP_PRIME == 158
case BN_P158:
ASSIGNK(BN_P158, BN_158);
endom = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 160
case SECG_P160:
ASSIGN(SECG_P160, SECG_160);
plain = 1;
break;
#endif
#if defined(EP_ENDOM) && FP_PRIME == 160
case SECG_K160:
ASSIGNK(SECG_K160, SECG_160D);
endom = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 192
case NIST_P192:
ASSIGN(NIST_P192, NIST_192);
plain = 1;
break;
#endif
#if defined(EP_ENDOM) && FP_PRIME == 192
case SECG_K192:
ASSIGNK(SECG_K192, SECG_192);
endom = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 221
case CURVE_22103:
ASSIGN(CURVE_22103, PRIME_22103);
plain = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 224
case NIST_P224:
ASSIGN(NIST_P224, NIST_224);
plain = 1;
break;
#endif
#if defined(EP_ENDOM) && FP_PRIME == 224
case SECG_K224:
ASSIGNK(SECG_K224, SECG_224);
endom = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 226
case CURVE_4417:
ASSIGN(CURVE_4417, PRIME_22605);
plain = 1;
break;
#endif
#if defined(EP_ENDOM) && FP_PRIME == 254
case BN_P254:
ASSIGNK(BN_P254, BN_254);
endom = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 251
case CURVE_1174:
ASSIGN(CURVE_1174, PRIME_25109);
plain = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 255
case CURVE_25519:
ASSIGN(CURVE_25519, PRIME_25519);
plain = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 256
case NIST_P256:
ASSIGN(NIST_P256, NIST_256);
plain = 1;
break;
#endif
#if defined(EP_ENDOM) && FP_PRIME == 256
case SECG_K256:
ASSIGNK(SECG_K256, SECG_256);
endom = 1;
break;
case BN_P256:
ASSIGNK(BN_P256, BN_256);
endom = 1;
break;
#endif
#if defined(EP_PLAIN) & FP_PRIME == 382
case CURVE_67254:
ASSIGN(CURVE_67254, PRIME_382105);
plain = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 383
case CURVE_383187:
ASSIGN(CURVE_383187, PRIME_383187);
plain = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 384
case NIST_P384:
ASSIGN(NIST_P384, NIST_384);
plain = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 477
case B24_P477:
ASSIGN(B24_P477, B24_477);
plain = 1;
break;
#endif
#if defined(EP_ENDOM) && FP_PRIME == 508
case KSS_P508:
ASSIGNK(KSS_P508, KSS_508);
endom = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 511
case CURVE_511187:
ASSIGN(CURVE_511187, PRIME_511187);
plain = 1;
break;
#endif
#if defined(EP_PLAIN) && FP_PRIME == 521
case NIST_P521:
ASSIGN(NIST_P521, NIST_521);
plain = 1;
break;
#endif
#if defined(EP_ENDOM) && FP_PRIME == 638
case BN_P638:
ASSIGNK(BN_P638, BN_638);
endom = 1;
break;
case B12_P638:
ASSIGNK(B12_P638, B12_638);
endom = 1;
break;
#endif
#if defined(EP_SUPER) && FP_PRIME == 1536
case SS_P1536:
ASSIGN(SS_P1536, SS_1536);
super = 1;
break;
#endif
default:
(void)str;
THROW(ERR_NO_VALID);
break;
}
/* Do not generate warnings. */
(void)endom;
(void)plain;
(void)beta;
fp_zero(g->z);
fp_set_dig(g->z, 1);
g->norm = 1;
#if defined(EP_PLAIN)
if (plain) {
ep_curve_set_plain(a, b, g, r, h);
core_get()->ep_id = param;
}
#endif
#if defined(EP_ENDOM)
if (endom) {
ep_curve_set_endom(b, g, r, h, beta, lamb);
core_get()->ep_id = param;
}
#endif
#if defined(EP_SUPER)
if (super) {
ep_curve_set_super(a, b, g, r, h);
core_get()->ep_id = param;
}
#endif
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(a);
fp_free(b);
fp_free(beta);
bn_free(lamb);
ep_free(g);
bn_free(r);
bn_free(h);
}
}
/**
* Doubles a point represented in affine coordinates on an ordinary prime
* elliptic curve.
*
* @param[out] r - the result.
* @param[out] s - the slope.
* @param[in] p - the point to double.
*/
static void ep_dbl_basic_imp(ep_t r, fp_t s, const ep_t p) {
fp_t t0, t1, t2;
fp_null(t0);
fp_null(t1);
fp_null(t2);
TRY {
fp_new(t0);
fp_new(t1);
fp_new(t2);
/* t0 = 1/2 * y1. */
fp_dbl(t0, p->y);
fp_inv(t0, t0);
/* t1 = 3 * x1^2 + a. */
fp_sqr(t1, p->x);
fp_copy(t2, t1);
fp_dbl(t1, t1);
fp_add(t1, t1, t2);
switch (ep_curve_opt_a()) {
case OPT_ZERO:
break;
case OPT_ONE:
fp_add_dig(t1, t1, (dig_t)1);
break;
#if FP_RDC != MONTY
case OPT_DIGIT:
fp_add_dig(t1, t1, ep_curve_get_a()[0]);
break;
#endif
default:
fp_add(t1, t1, ep_curve_get_a());
break;
}
/* t1 = (3 * x1^2 + a)/(2 * y1). */
fp_mul(t1, t1, t0);
if (s != NULL) {
fp_copy(s, t1);
}
/* t2 = t1^2. */
fp_sqr(t2, t1);
/* x3 = t1^2 - 2 * x1. */
fp_dbl(t0, p->x);
fp_sub(t0, t2, t0);
/* y3 = t1 * (x1 - x3) - y1. */
fp_sub(t2, p->x, t0);
fp_mul(t1, t1, t2);
fp_sub(r->y, t1, p->y);
fp_copy(r->x, t0);
fp_copy(r->z, p->z);
r->norm = 1;
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
fp_free(t0);
fp_free(t1);
fp_free(t2);
}
}
static bool add_mbtool_services()
{
autoclose::file fp_old(autoclose::fopen("/init.rc", "rb"));
if (!fp_old) {
if (errno == ENOENT) {
return true;
} else {
LOGE("Failed to open /init.rc: %s", strerror(errno));
return false;
}
}
autoclose::file fp_new(autoclose::fopen("/init.rc.new", "wb"));
if (!fp_new) {
LOGE("Failed to open /init.rc.new for writing: %s",
strerror(errno));
return false;
}
char *line = nullptr;
size_t len = 0;
ssize_t read = 0;
auto free_line = util::finally([&] {
free(line);
});
bool has_init_multiboot_rc = false;
bool has_disabled_installd = false;
bool inside_service = false;
while ((read = getline(&line, &len, fp_old.get())) >= 0) {
if (strstr(line, "import /init.multiboot.rc")) {
has_init_multiboot_rc = true;
}
if (util::starts_with(line, "service")) {
inside_service = strstr(line, "installd") != nullptr;
} else if (inside_service && is_completely_whitespace(line)) {
inside_service = false;
}
if (inside_service && strstr(line, "disabled")) {
has_disabled_installd = true;
}
}
rewind(fp_old.get());
while ((read = getline(&line, &len, fp_old.get())) >= 0) {
// Load /init.multiboot.rc
if (!has_init_multiboot_rc && line[0] != '#') {
has_init_multiboot_rc = true;
fputs("import /init.multiboot.rc\n", fp_new.get());
}
if (fwrite(line, 1, read, fp_new.get()) != (std::size_t) read) {
LOGE("Failed to write to /init.rc.new: %s", strerror(errno));
return false;
}
// Disable installd. mbtool's appsync will spawn it on demand
if (!has_disabled_installd
&& util::starts_with(line, "service")
&& strstr(line, "installd")) {
fputs(" disabled\n", fp_new.get());
}
}
if (!replace_file("/init.rc", "/init.rc.new")) {
return false;
}
// Create /init.multiboot.rc
autoclose::file fp_multiboot(autoclose::fopen("/init.multiboot.rc", "wb"));
if (!fp_multiboot) {
LOGE("Failed to open /init.multiboot.rc for writing: %s",
strerror(errno));
return false;
}
static const char *init_multiboot_rc =
"service mbtooldaemon /mbtool daemon\n"
" class main\n"
" user root\n"
" oneshot\n"
"\n"
"service appsync /mbtool appsync\n"
" class main\n"
" socket installd stream 600 system system\n";
fputs(init_multiboot_rc, fp_multiboot.get());
fchmod(fileno(fp_multiboot.get()), 0750);
return true;
}
int fp_srt(fp_t c, const fp_t a) {
bn_t e;
fp_t t0;
fp_t t1;
int r = 0;
bn_null(e);
fp_null(t0);
fp_null(t1);
TRY {
bn_new(e);
fp_new(t0);
fp_new(t1);
/* Make e = p. */
e->used = FP_DIGS;
dv_copy(e->dp, fp_prime_get(), FP_DIGS);
if (fp_prime_get_mod8() == 3 || fp_prime_get_mod8() == 7) {
/* Easy case, compute a^((p + 1)/4). */
bn_add_dig(e, e, 1);
bn_rsh(e, e, 2);
fp_exp(t0, a, e);
fp_sqr(t1, t0);
r = (fp_cmp(t1, a) == CMP_EQ);
fp_copy(c, t0);
} else {
int f = 0, m = 0;
/* First, check if there is a root. Compute t1 = a^((p - 1)/2). */
bn_rsh(e, e, 1);
fp_exp(t0, a, e);
if (fp_cmp_dig(t0, 1) != CMP_EQ) {
/* Nope, there is no square root. */
r = 0;
} else {
r = 1;
/* Find a quadratic non-residue modulo p, that is a number t2
* such that (t2 | p) = t2^((p - 1)/2)!= 1. */
do {
fp_rand(t1);
fp_exp(t0, t1, e);
} while (fp_cmp_dig(t0, 1) == CMP_EQ);
/* Write p - 1 as (e * 2^f), odd e. */
bn_lsh(e, e, 1);
while (bn_is_even(e)) {
bn_rsh(e, e, 1);
f++;
}
/* Compute t2 = t2^e. */
fp_exp(t1, t1, e);
/* Compute t1 = a^e, c = a^((e + 1)/2) = a^(e/2 + 1), odd e. */
bn_rsh(e, e, 1);
fp_exp(t0, a, e);
fp_mul(e->dp, t0, a);
fp_sqr(t0, t0);
fp_mul(t0, t0, a);
fp_copy(c, e->dp);
while (1) {
if (fp_cmp_dig(t0, 1) == CMP_EQ) {
break;
}
fp_copy(e->dp, t0);
for (m = 0; (m < f) && (fp_cmp_dig(t0, 1) != CMP_EQ); m++) {
fp_sqr(t0, t0);
}
fp_copy(t0, e->dp);
for (int i = 0; i < f - m - 1; i++) {
fp_sqr(t1, t1);
}
fp_mul(c, c, t1);
fp_sqr(t1, t1);
fp_mul(t0, t0, t1);
f = m;
}
}
}
}
CATCH_ANY {
THROW(ERR_CAUGHT);
}
FINALLY {
bn_free(e);
fp_free(t0);
fp_free(t1);
}
return r;
}
static bool strip_manual_mounts()
{
autoclose::dir dir(autoclose::opendir("/"));
if (!dir) {
return true;
}
struct dirent *ent;
while ((ent = readdir(dir.get()))) {
// Look for *.rc files
if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0
|| !util::ends_with(ent->d_name, ".rc")) {
continue;
}
std::string path("/");
path += ent->d_name;
autoclose::file fp(autoclose::fopen(path.c_str(), "r"));
if (!fp) {
LOGE("Failed to open %s for reading: %s",
path.c_str(), strerror(errno));
continue;
}
char *line = nullptr;
size_t len = 0;
ssize_t read = 0;
auto free_line = util::finally([&] {
free(line);
});
std::size_t count = 0;
std::unordered_set<std::size_t> comment_out;
// Find out which lines need to be commented out
while ((read = getline(&line, &len, fp.get())) >= 0) {
if (strstr(line, "mount")
&& (strstr(line, "/system")
|| strstr(line, "/cache")
|| strstr(line, "/data"))) {
std::vector<std::string> tokens = util::tokenize(line, " \t\n");
if (tokens.size() >= 4 && tokens[0] == "mount"
&& (tokens[3] == "/system"
|| tokens[3] == "/cache"
|| tokens[3] == "/data")) {
comment_out.insert(count);
}
}
++count;
}
if (comment_out.empty()) {
continue;
}
// Go back to beginning of file for reread
rewind(fp.get());
count = 0;
std::string new_path(path);
new_path += ".new";
autoclose::file fp_new(autoclose::fopen(new_path.c_str(), "w"));
if (!fp_new) {
LOGE("Failed to open %s for writing: %s",
new_path.c_str(), strerror(errno));
continue;
}
// Actually comment out the lines
while ((read = getline(&line, &len, fp.get())) >= 0) {
if (comment_out.find(count) != comment_out.end()) {
fputs("#", fp_new.get());
}
fputs(line, fp_new.get());
++count;
}
replace_file(path.c_str(), new_path.c_str());
}
return true;
}
