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#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "core_h2c.h"
#include "crypto_core_ed25519.h"
#include "crypto_hash_sha512.h"
#include "private/common.h"
#include "private/ed25519_ref10.h"
#include "randombytes.h"
#include "utils.h"
int
crypto_core_ed25519_is_valid_point(const unsigned char *p)
{
ge25519_p3 p_p3;
if (ge25519_is_canonical(p) == 0 ||
ge25519_frombytes(&p_p3, p) != 0 ||
ge25519_is_on_curve(&p_p3) == 0 ||
ge25519_has_small_order(&p_p3) != 0 ||
ge25519_is_on_main_subgroup(&p_p3) == 0) {
return 0;
}
return 1;
}
int
crypto_core_ed25519_add(unsigned char *r,
const unsigned char *p, const unsigned char *q)
{
ge25519_p3 p_p3, q_p3, r_p3;
if (ge25519_frombytes(&p_p3, p) != 0 || ge25519_is_on_curve(&p_p3) == 0 ||
ge25519_frombytes(&q_p3, q) != 0 || ge25519_is_on_curve(&q_p3) == 0) {
return -1;
}
ge25519_p3_add(&r_p3, &p_p3, &q_p3);
ge25519_p3_tobytes(r, &r_p3);
return 0;
}
int
crypto_core_ed25519_sub(unsigned char *r,
const unsigned char *p, const unsigned char *q)
{
ge25519_p3 p_p3, q_p3, r_p3;
if (ge25519_frombytes(&p_p3, p) != 0 || ge25519_is_on_curve(&p_p3) == 0 ||
ge25519_frombytes(&q_p3, q) != 0 || ge25519_is_on_curve(&q_p3) == 0) {
return -1;
}
ge25519_p3_sub(&r_p3, &p_p3, &q_p3);
ge25519_p3_tobytes(r, &r_p3);
return 0;
}
int
crypto_core_ed25519_from_uniform(unsigned char *p, const unsigned char *r)
{
ge25519_from_uniform(p, r);
return 0;
}
int
crypto_core_ed25519_from_string(unsigned char p[crypto_core_ed25519_BYTES],
const char *ctx, const unsigned char *msg,
size_t msg_len, int hash_alg)
{
return ge25519_from_string(p, ctx, msg, msg_len, hash_alg);
}
int
crypto_core_ed25519_from_string_ro(unsigned char p[crypto_core_ed25519_BYTES],
const char *ctx, const unsigned char *msg,
size_t msg_len, int hash_alg)
{
return ge25519_from_string_ro(p, ctx, msg, msg_len, hash_alg);
}
void
crypto_core_ed25519_random(unsigned char *p)
{
unsigned char h[crypto_core_ed25519_UNIFORMBYTES];
randombytes_buf(h, sizeof h);
(void) crypto_core_ed25519_from_uniform(p, h);
}
void
crypto_core_ed25519_scalar_random(unsigned char *r)
{
do {
randombytes_buf(r, crypto_core_ed25519_SCALARBYTES);
r[crypto_core_ed25519_SCALARBYTES - 1] &= 0x1f;
} while (sc25519_is_canonical(r) == 0 ||
sodium_is_zero(r, crypto_core_ed25519_SCALARBYTES));
}
int
crypto_core_ed25519_scalar_invert(unsigned char *recip, const unsigned char *s)
{
sc25519_invert(recip, s);
return - sodium_is_zero(s, crypto_core_ed25519_SCALARBYTES);
}
/* 2^252+27742317777372353535851937790883648493 */
static const unsigned char L[] = {
0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58, 0xd6, 0x9c, 0xf7,
0xa2, 0xde, 0xf9, 0xde, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10
};
void
crypto_core_ed25519_scalar_negate(unsigned char *neg, const unsigned char *s)
{
unsigned char t_[crypto_core_ed25519_NONREDUCEDSCALARBYTES];
unsigned char s_[crypto_core_ed25519_NONREDUCEDSCALARBYTES];
COMPILER_ASSERT(crypto_core_ed25519_NONREDUCEDSCALARBYTES >=
2 * crypto_core_ed25519_SCALARBYTES);
memset(t_, 0, sizeof t_);
memset(s_, 0, sizeof s_);
memcpy(t_ + crypto_core_ed25519_SCALARBYTES, L,
crypto_core_ed25519_SCALARBYTES);
memcpy(s_, s, crypto_core_ed25519_SCALARBYTES);
sodium_sub(t_, s_, sizeof t_);
sc25519_reduce(t_);
memcpy(neg, t_, crypto_core_ed25519_SCALARBYTES);
}
void
crypto_core_ed25519_scalar_complement(unsigned char *comp,
const unsigned char *s)
{
unsigned char t_[crypto_core_ed25519_NONREDUCEDSCALARBYTES];
unsigned char s_[crypto_core_ed25519_NONREDUCEDSCALARBYTES];
COMPILER_ASSERT(crypto_core_ed25519_NONREDUCEDSCALARBYTES >=
2 * crypto_core_ed25519_SCALARBYTES);
memset(t_, 0, sizeof t_);
memset(s_, 0, sizeof s_);
t_[0]++;
memcpy(t_ + crypto_core_ed25519_SCALARBYTES, L,
crypto_core_ed25519_SCALARBYTES);
memcpy(s_, s, crypto_core_ed25519_SCALARBYTES);
sodium_sub(t_, s_, sizeof t_);
sc25519_reduce(t_);
memcpy(comp, t_, crypto_core_ed25519_SCALARBYTES);
}
void
crypto_core_ed25519_scalar_add(unsigned char *z, const unsigned char *x,
const unsigned char *y)
{
unsigned char x_[crypto_core_ed25519_NONREDUCEDSCALARBYTES];
unsigned char y_[crypto_core_ed25519_NONREDUCEDSCALARBYTES];
memset(x_, 0, sizeof x_);
memset(y_, 0, sizeof y_);
memcpy(x_, x, crypto_core_ed25519_SCALARBYTES);
memcpy(y_, y, crypto_core_ed25519_SCALARBYTES);
sodium_add(x_, y_, crypto_core_ed25519_SCALARBYTES);
crypto_core_ed25519_scalar_reduce(z, x_);
}
void
crypto_core_ed25519_scalar_sub(unsigned char *z, const unsigned char *x,
const unsigned char *y)
{
unsigned char yn[crypto_core_ed25519_SCALARBYTES];
crypto_core_ed25519_scalar_negate(yn, y);
crypto_core_ed25519_scalar_add(z, x, yn);
}
void
crypto_core_ed25519_scalar_mul(unsigned char *z, const unsigned char *x,
const unsigned char *y)
{
sc25519_mul(z, x, y);
}
void
crypto_core_ed25519_scalar_reduce(unsigned char *r,
const unsigned char *s)
{
unsigned char t[crypto_core_ed25519_NONREDUCEDSCALARBYTES];
memcpy(t, s, sizeof t);
sc25519_reduce(t);
memcpy(r, t, crypto_core_ed25519_SCALARBYTES);
sodium_memzero(t, sizeof t);
}
int
crypto_core_ed25519_scalar_is_canonical(const unsigned char *s)
{
return sc25519_is_canonical(s);
}
size_t
crypto_core_ed25519_bytes(void)
{
return crypto_core_ed25519_BYTES;
}
size_t
crypto_core_ed25519_nonreducedscalarbytes(void)
{
return crypto_core_ed25519_NONREDUCEDSCALARBYTES;
}
size_t
crypto_core_ed25519_uniformbytes(void)
{
return crypto_core_ed25519_UNIFORMBYTES;
}
size_t
crypto_core_ed25519_hashbytes(void)
{
return crypto_core_ed25519_HASHBYTES;
}
size_t
crypto_core_ed25519_scalarbytes(void)
{
return crypto_core_ed25519_SCALARBYTES;
}
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