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#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "crypto_pwhash_scryptsalsa208sha256.h"
#include "crypto_scrypt.h"
#include "private/common.h"
#include "randombytes.h"
#include "utils.h"
#define SETTING_SIZE(saltbytes) \
((sizeof "$7$" - 1U) + (1U /* N_log2 */) + (5U /* r */) + (5U /* p */) + \
BYTES2CHARS(saltbytes))
static int
pickparams(unsigned long long opslimit, const size_t memlimit,
uint32_t *const N_log2, uint32_t *const p, uint32_t *const r)
{
unsigned long long maxN;
unsigned long long maxrp;
if (opslimit < 32768) {
opslimit = 32768;
}
*r = 8;
if (opslimit < memlimit / 32) {
*p = 1;
maxN = opslimit / (*r * 4);
for (*N_log2 = 1; *N_log2 < 63; *N_log2 += 1) {
if ((uint64_t)(1) << *N_log2 > maxN / 2) {
break;
}
}
} else {
maxN = memlimit / ((size_t) *r * 128);
for (*N_log2 = 1; *N_log2 < 63; *N_log2 += 1) {
if ((uint64_t)(1) << *N_log2 > maxN / 2) {
break;
}
}
maxrp = (opslimit / 4) / ((uint64_t)(1) << *N_log2);
/* LCOV_EXCL_START */
if (maxrp > 0x3fffffff) {
maxrp = 0x3fffffff;
}
/* LCOV_EXCL_STOP */
*p = (uint32_t)(maxrp) / *r;
}
return 0;
}
static size_t
sodium_strnlen(const char *str, size_t maxlen)
{
size_t i = 0U;
ACQUIRE_FENCE;
while (i < maxlen && str[i] != 0) {
i++;
}
return i;
}
size_t
crypto_pwhash_scryptsalsa208sha256_bytes_min(void)
{
return crypto_pwhash_scryptsalsa208sha256_BYTES_MIN;
}
size_t
crypto_pwhash_scryptsalsa208sha256_bytes_max(void)
{
return crypto_pwhash_scryptsalsa208sha256_BYTES_MAX;
}
size_t
crypto_pwhash_scryptsalsa208sha256_passwd_min(void)
{
return crypto_pwhash_scryptsalsa208sha256_PASSWD_MIN;
}
size_t
crypto_pwhash_scryptsalsa208sha256_passwd_max(void)
{
return crypto_pwhash_scryptsalsa208sha256_PASSWD_MAX;
}
size_t
crypto_pwhash_scryptsalsa208sha256_saltbytes(void)
{
return crypto_pwhash_scryptsalsa208sha256_SALTBYTES;
}
size_t
crypto_pwhash_scryptsalsa208sha256_strbytes(void)
{
return crypto_pwhash_scryptsalsa208sha256_STRBYTES;
}
const char *
crypto_pwhash_scryptsalsa208sha256_strprefix(void)
{
return crypto_pwhash_scryptsalsa208sha256_STRPREFIX;
}
unsigned long long
crypto_pwhash_scryptsalsa208sha256_opslimit_min(void)
{
return crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_MIN;
}
unsigned long long
crypto_pwhash_scryptsalsa208sha256_opslimit_max(void)
{
return crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_MAX;
}
size_t
crypto_pwhash_scryptsalsa208sha256_memlimit_min(void)
{
return crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_MIN;
}
size_t
crypto_pwhash_scryptsalsa208sha256_memlimit_max(void)
{
return crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_MAX;
}
unsigned long long
crypto_pwhash_scryptsalsa208sha256_opslimit_interactive(void)
{
return crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_INTERACTIVE;
}
size_t
crypto_pwhash_scryptsalsa208sha256_memlimit_interactive(void)
{
return crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_INTERACTIVE;
}
unsigned long long
crypto_pwhash_scryptsalsa208sha256_opslimit_sensitive(void)
{
return crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_SENSITIVE;
}
size_t
crypto_pwhash_scryptsalsa208sha256_memlimit_sensitive(void)
{
return crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_SENSITIVE;
}
int
crypto_pwhash_scryptsalsa208sha256(unsigned char *const out,
unsigned long long outlen,
const char *const passwd,
unsigned long long passwdlen,
const unsigned char *const salt,
unsigned long long opslimit, size_t memlimit)
{
uint32_t N_log2;
uint32_t p;
uint32_t r;
memset(out, 0, outlen);
if (passwdlen > crypto_pwhash_scryptsalsa208sha256_PASSWD_MAX ||
outlen > crypto_pwhash_scryptsalsa208sha256_BYTES_MAX) {
errno = EFBIG; /* LCOV_EXCL_LINE */
return -1; /* LCOV_EXCL_LINE */
}
if (outlen < crypto_pwhash_scryptsalsa208sha256_BYTES_MIN ||
pickparams(opslimit, memlimit, &N_log2, &p, &r) != 0) {
errno = EINVAL; /* LCOV_EXCL_LINE */
return -1; /* LCOV_EXCL_LINE */
}
if ((const void *) out == (const void *) passwd) {
errno = EINVAL;
return -1;
}
return crypto_pwhash_scryptsalsa208sha256_ll(
(const uint8_t *) passwd, (size_t) passwdlen, (const uint8_t *) salt,
crypto_pwhash_scryptsalsa208sha256_SALTBYTES, (uint64_t)(1) << N_log2,
r, p, out, (size_t) outlen);
}
int
crypto_pwhash_scryptsalsa208sha256_str(
char out[crypto_pwhash_scryptsalsa208sha256_STRBYTES],
const char *const passwd, unsigned long long passwdlen,
unsigned long long opslimit, size_t memlimit)
{
uint8_t salt[crypto_pwhash_scryptsalsa208sha256_STRSALTBYTES];
char setting[crypto_pwhash_scryptsalsa208sha256_STRSETTINGBYTES + 1U];
escrypt_local_t escrypt_local;
uint32_t N_log2;
uint32_t p;
uint32_t r;
memset(out, 0, crypto_pwhash_scryptsalsa208sha256_STRBYTES);
if (passwdlen > crypto_pwhash_scryptsalsa208sha256_PASSWD_MAX) {
errno = EFBIG; /* LCOV_EXCL_LINE */
return -1; /* LCOV_EXCL_LINE */
}
if (passwdlen < crypto_pwhash_scryptsalsa208sha256_PASSWD_MIN ||
pickparams(opslimit, memlimit, &N_log2, &p, &r) != 0) {
errno = EINVAL; /* LCOV_EXCL_LINE */
return -1; /* LCOV_EXCL_LINE */
}
randombytes_buf(salt, sizeof salt);
if (escrypt_gensalt_r(N_log2, r, p, salt, sizeof salt, (uint8_t *) setting,
sizeof setting) == NULL) {
errno = EINVAL; /* LCOV_EXCL_LINE */
return -1; /* LCOV_EXCL_LINE */
}
if (escrypt_init_local(&escrypt_local) != 0) {
return -1; /* LCOV_EXCL_LINE */
}
if (escrypt_r(&escrypt_local, (const uint8_t *) passwd, (size_t) passwdlen,
(const uint8_t *) setting, (uint8_t *) out,
crypto_pwhash_scryptsalsa208sha256_STRBYTES) == NULL) {
/* LCOV_EXCL_START */
escrypt_free_local(&escrypt_local);
errno = EINVAL;
return -1;
/* LCOV_EXCL_STOP */
}
escrypt_free_local(&escrypt_local);
COMPILER_ASSERT(
SETTING_SIZE(crypto_pwhash_scryptsalsa208sha256_STRSALTBYTES) ==
crypto_pwhash_scryptsalsa208sha256_STRSETTINGBYTES);
COMPILER_ASSERT(
crypto_pwhash_scryptsalsa208sha256_STRSETTINGBYTES + 1U +
crypto_pwhash_scryptsalsa208sha256_STRHASHBYTES_ENCODED + 1U ==
crypto_pwhash_scryptsalsa208sha256_STRBYTES);
return 0;
}
int
crypto_pwhash_scryptsalsa208sha256_str_verify(
const char *str,
const char *const passwd, unsigned long long passwdlen)
{
char wanted[crypto_pwhash_scryptsalsa208sha256_STRBYTES];
escrypt_local_t escrypt_local;
int ret = -1;
if (sodium_strnlen(str, crypto_pwhash_scryptsalsa208sha256_STRBYTES) !=
crypto_pwhash_scryptsalsa208sha256_STRBYTES - 1U) {
return -1;
}
if (escrypt_init_local(&escrypt_local) != 0) {
return -1; /* LCOV_EXCL_LINE */
}
memset(wanted, 0, sizeof wanted);
if (escrypt_r(&escrypt_local, (const uint8_t *) passwd, (size_t) passwdlen,
(const uint8_t *) str, (uint8_t *) wanted,
sizeof wanted) == NULL) {
escrypt_free_local(&escrypt_local);
return -1;
}
escrypt_free_local(&escrypt_local);
ret = sodium_memcmp(wanted, str, sizeof wanted);
sodium_memzero(wanted, sizeof wanted);
return ret;
}
int
crypto_pwhash_scryptsalsa208sha256_str_needs_rehash(
const char * str,
unsigned long long opslimit, size_t memlimit)
{
uint32_t N_log2, N_log2_;
uint32_t p, p_;
uint32_t r, r_;
if (pickparams(opslimit, memlimit, &N_log2, &p, &r) != 0) {
errno = EINVAL;
return -1;
}
if (sodium_strnlen(str, crypto_pwhash_scryptsalsa208sha256_STRBYTES) !=
crypto_pwhash_scryptsalsa208sha256_STRBYTES - 1U) {
errno = EINVAL;
return -1;
}
if (escrypt_parse_setting((const uint8_t *) str,
&N_log2_, &r_, &p_) == NULL) {
errno = EINVAL;
return -1;
}
if (N_log2 != N_log2_ || r != r_ || p != p_) {
return 1;
}
return 0;
}
|
