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neoscrypt.c
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neoscrypt.c
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/*
* Copyright (c) 2009 Colin Percival, 2011 ArtForz
* Copyright (c) 2012 Andrew Moon (floodyberry)
* Copyright (c) 2012 Samuel Neves <[email protected]>
* Copyright (c) 2014 John Doering <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "neoscrypt.h"
#if (WINDOWS)
/* sizeof(unsigned long) = 4 for MinGW64 */
typedef unsigned long long ulong;
#else
typedef unsigned long ulong;
#endif
typedef unsigned int uint;
typedef unsigned char uchar;
typedef unsigned int bool;
#define MIN(a, b) ((a) < (b) ? a : b)
#define MAX(a, b) ((a) > (b) ? a : b)
#if (SHA256)
/* SHA-256 */
static const uint32_t sha256_constants[64] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
#define Ch(x,y,z) (z ^ (x & (y ^ z)))
#define Maj(x,y,z) (((x | y) & z) | (x & y))
#define S0(x) (ROTR32(x, 2) ^ ROTR32(x, 13) ^ ROTR32(x, 22))
#define S1(x) (ROTR32(x, 6) ^ ROTR32(x, 11) ^ ROTR32(x, 25))
#define G0(x) (ROTR32(x, 7) ^ ROTR32(x, 18) ^ (x >> 3))
#define G1(x) (ROTR32(x, 17) ^ ROTR32(x, 19) ^ (x >> 10))
#define W0(in,i) (U8TO32_BE(&in[i * 4]))
#define W1(i) (G1(w[i - 2]) + w[i - 7] + G0(w[i - 15]) + w[i - 16])
#define STEP(i) \
t1 = S0(r[0]) + Maj(r[0], r[1], r[2]); \
t0 = r[7] + S1(r[4]) + Ch(r[4], r[5], r[6]) + sha256_constants[i] + w[i]; \
r[7] = r[6]; \
r[6] = r[5]; \
r[5] = r[4]; \
r[4] = r[3] + t0; \
r[3] = r[2]; \
r[2] = r[1]; \
r[1] = r[0]; \
r[0] = t0 + t1;
typedef struct sha256_hash_state_t {
uint32_t H[8];
uint64_t T;
uint32_t leftover;
uint8_t buffer[SCRYPT_HASH_BLOCK_SIZE];
} sha256_hash_state;
static void sha256_blocks(sha256_hash_state *S, const uint8_t *in, size_t blocks) {
uint32_t r[8], w[64], t0, t1;
size_t i;
for(i = 0; i < 8; i++)
r[i] = S->H[i];
while(blocks--) {
for(i = 0; i < 16; i++) {
w[i] = W0(in, i);
}
for(i = 16; i < 64; i++) {
w[i] = W1(i);
}
for(i = 0; i < 64; i++) {
STEP(i);
}
for(i = 0; i < 8; i++) {
r[i] += S->H[i];
S->H[i] = r[i];
}
S->T += SCRYPT_HASH_BLOCK_SIZE * 8;
in += SCRYPT_HASH_BLOCK_SIZE;
}
}
static void neoscrypt_hash_init_sha256(sha256_hash_state *S) {
S->H[0] = 0x6a09e667;
S->H[1] = 0xbb67ae85;
S->H[2] = 0x3c6ef372;
S->H[3] = 0xa54ff53a;
S->H[4] = 0x510e527f;
S->H[5] = 0x9b05688c;
S->H[6] = 0x1f83d9ab;
S->H[7] = 0x5be0cd19;
S->T = 0;
S->leftover = 0;
}
static void neoscrypt_hash_update_sha256(sha256_hash_state *S, const uint8_t *in, size_t inlen) {
size_t blocks, want;
/* handle the previous data */
if(S->leftover) {
want = (SCRYPT_HASH_BLOCK_SIZE - S->leftover);
want = (want < inlen) ? want : inlen;
memcpy(S->buffer + S->leftover, in, want);
S->leftover += (uint32_t)want;
if(S->leftover < SCRYPT_HASH_BLOCK_SIZE)
return;
in += want;
inlen -= want;
sha256_blocks(S, S->buffer, 1);
}
/* handle the current data */
blocks = (inlen & ~(SCRYPT_HASH_BLOCK_SIZE - 1));
S->leftover = (uint32_t)(inlen - blocks);
if(blocks) {
sha256_blocks(S, in, blocks / SCRYPT_HASH_BLOCK_SIZE);
in += blocks;
}
/* handle leftover data */
if(S->leftover)
memcpy(S->buffer, in, S->leftover);
}
static void neoscrypt_hash_finish_sha256(sha256_hash_state *S, uint8_t *hash) {
uint64_t t = S->T + (S->leftover * 8);
S->buffer[S->leftover] = 0x80;
if(S->leftover <= 55) {
memset(S->buffer + S->leftover + 1, 0, 55 - S->leftover);
} else {
memset(S->buffer + S->leftover + 1, 0, 63 - S->leftover);
sha256_blocks(S, S->buffer, 1);
memset(S->buffer, 0, 56);
}
U64TO8_BE(S->buffer + 56, t);
sha256_blocks(S, S->buffer, 1);
U32TO8_BE(&hash[ 0], S->H[0]);
U32TO8_BE(&hash[ 4], S->H[1]);
U32TO8_BE(&hash[ 8], S->H[2]);
U32TO8_BE(&hash[12], S->H[3]);
U32TO8_BE(&hash[16], S->H[4]);
U32TO8_BE(&hash[20], S->H[5]);
U32TO8_BE(&hash[24], S->H[6]);
U32TO8_BE(&hash[28], S->H[7]);
}
static void neoscrypt_hash_sha256(hash_digest hash, const uint8_t *m, size_t mlen) {
sha256_hash_state st;
neoscrypt_hash_init_sha256(&st);
neoscrypt_hash_update_sha256(&st, m, mlen);
neoscrypt_hash_finish_sha256(&st, hash);
}
/* HMAC for SHA-256 */
typedef struct sha256_hmac_state_t {
sha256_hash_state inner, outer;
} sha256_hmac_state;
static void neoscrypt_hmac_init_sha256(sha256_hmac_state *st, const uint8_t *key, size_t keylen) {
uint8_t pad[SCRYPT_HASH_BLOCK_SIZE] = {0};
size_t i;
neoscrypt_hash_init_sha256(&st->inner);
neoscrypt_hash_init_sha256(&st->outer);
if(keylen <= SCRYPT_HASH_BLOCK_SIZE) {
/* use the key directly if it's <= blocksize bytes */
memcpy(pad, key, keylen);
} else {
/* if it's > blocksize bytes, hash it */
neoscrypt_hash_sha256(pad, key, keylen);
}
/* inner = (key ^ 0x36) */
/* h(inner || ...) */
for(i = 0; i < SCRYPT_HASH_BLOCK_SIZE; i++)
pad[i] ^= 0x36;
neoscrypt_hash_update_sha256(&st->inner, pad, SCRYPT_HASH_BLOCK_SIZE);
/* outer = (key ^ 0x5c) */
/* h(outer || ...) */
for(i = 0; i < SCRYPT_HASH_BLOCK_SIZE; i++)
pad[i] ^= (0x5c ^ 0x36);
neoscrypt_hash_update_sha256(&st->outer, pad, SCRYPT_HASH_BLOCK_SIZE);
}
static void neoscrypt_hmac_update_sha256(sha256_hmac_state *st, const uint8_t *m, size_t mlen) {
/* h(inner || m...) */
neoscrypt_hash_update_sha256(&st->inner, m, mlen);
}
static void neoscrypt_hmac_finish_sha256(sha256_hmac_state *st, hash_digest mac) {
/* h(inner || m) */
hash_digest innerhash;
neoscrypt_hash_finish_sha256(&st->inner, innerhash);
/* h(outer || h(inner || m)) */
neoscrypt_hash_update_sha256(&st->outer, innerhash, sizeof(innerhash));
neoscrypt_hash_finish_sha256(&st->outer, mac);
}
/* PBKDF2 for SHA-256 */
static void neoscrypt_pbkdf2_sha256(const uint8_t *password, size_t password_len,
const uint8_t *salt, size_t salt_len, uint64_t N, uint8_t *output, size_t output_len) {
sha256_hmac_state hmac_pw, hmac_pw_salt, work;
hash_digest ti, u;
uint8_t be[4];
uint32_t i, j, k, blocks;
/* bytes must be <= (0xffffffff - (SCRYPT_HASH_DIGEST_SIZE - 1)), which they will always be under scrypt */
/* hmac(password, ...) */
neoscrypt_hmac_init_sha256(&hmac_pw, password, password_len);
/* hmac(password, salt...) */
hmac_pw_salt = hmac_pw;
neoscrypt_hmac_update_sha256(&hmac_pw_salt, salt, salt_len);
blocks = ((uint32_t)output_len + (SCRYPT_HASH_DIGEST_SIZE - 1)) / SCRYPT_HASH_DIGEST_SIZE;
for(i = 1; i <= blocks; i++) {
/* U1 = hmac(password, salt || be(i)) */
U32TO8_BE(be, i);
work = hmac_pw_salt;
neoscrypt_hmac_update_sha256(&work, be, 4);
neoscrypt_hmac_finish_sha256(&work, ti);
memcpy(u, ti, sizeof(u));
/* T[i] = U1 ^ U2 ^ U3... */
for(j = 0; j < N - 1; j++) {
/* UX = hmac(password, U{X-1}) */
work = hmac_pw;
neoscrypt_hmac_update_sha256(&work, u, SCRYPT_HASH_DIGEST_SIZE);
neoscrypt_hmac_finish_sha256(&work, u);
/* T[i] ^= UX */
for(k = 0; k < sizeof(u); k++)
ti[k] ^= u[k];
}
memcpy(output, ti, (output_len > SCRYPT_HASH_DIGEST_SIZE) ? SCRYPT_HASH_DIGEST_SIZE : output_len);
output += SCRYPT_HASH_DIGEST_SIZE;
output_len -= SCRYPT_HASH_DIGEST_SIZE;
}
}
#endif
#if (BLAKE256)
/* BLAKE-256 */
const uint8_t blake256_sigma[] = {
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,
};
const uint32_t blake256_constants[16] = {
0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344,0xa4093822, 0x299f31d0, 0x082efa98, 0xec4e6c89,
0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917
};
typedef struct blake256_hash_state_t {
uint32_t H[8], T[2];
uint32_t leftover;
uint8_t buffer[SCRYPT_HASH_BLOCK_SIZE];
} blake256_hash_state;
static void blake256_blocks(blake256_hash_state *S, const uint8_t *in, size_t blocks) {
const uint8_t *sigma, *sigma_end = blake256_sigma + (10 * 16);
uint32_t m[16], v[16], h[8], t[2];
uint32_t i;
for(i = 0; i < 8; i++)
h[i] = S->H[i];
for(i = 0; i < 2; i++)
t[i] = S->T[i];
while(blocks--) {
t[0] += 512;
t[1] += (t[0] < 512) ? 1 : 0;
for(i = 0; i < 8; i++)
v[i] = h[i];
for(i = 0; i < 4; i++)
v[i + 8] = blake256_constants[i];
for(i = 0; i < 2; i++)
v[i + 12] = blake256_constants[i+4] ^ t[0];
for(i = 0; i < 2; i++)
v[i + 14] = blake256_constants[i+6] ^ t[1];
for(i = 0; i < 16; i++)
m[i] = U8TO32_BE(&in[i * 4]);
in += 64;
#define G(a,b,c,d,e) \
v[a] += (m[sigma[e+0]] ^ blake256_constants[sigma[e+1]]) + v[b]; \
v[d] = ROTR32(v[d] ^ v[a],16); \
v[c] += v[d]; \
v[b] = ROTR32(v[b] ^ v[c],12); \
v[a] += (m[sigma[e+1]] ^ blake256_constants[sigma[e+0]]) + v[b]; \
v[d] = ROTR32(v[d] ^ v[a], 8); \
v[c] += v[d]; \
v[b] = ROTR32(v[b] ^ v[c], 7);
for(i = 0, sigma = blake256_sigma; i < 14; i++) {
G(0, 4, 8,12, 0);
G(1, 5, 9,13, 2);
G(2, 6,10,14, 4);
G(3, 7,11,15, 6);
G(0, 5,10,15, 8);
G(1, 6,11,12,10);
G(2, 7, 8,13,12);
G(3, 4, 9,14,14);
sigma += 16;
if(sigma == sigma_end)
sigma = blake256_sigma;
}
#undef G
for(i = 0; i < 8; i++)
h[i] ^= (v[i] ^ v[i + 8]);
}
for(i = 0; i < 8; i++)
S->H[i] = h[i];
for(i = 0; i < 2; i++)
S->T[i] = t[i];
}
static void neoscrypt_hash_init_blake256(blake256_hash_state *S) {
S->H[0] = 0x6a09e667ULL;
S->H[1] = 0xbb67ae85ULL;
S->H[2] = 0x3c6ef372ULL;
S->H[3] = 0xa54ff53aULL;
S->H[4] = 0x510e527fULL;
S->H[5] = 0x9b05688cULL;
S->H[6] = 0x1f83d9abULL;
S->H[7] = 0x5be0cd19ULL;
S->T[0] = 0;
S->T[1] = 0;
S->leftover = 0;
}
static void neoscrypt_hash_update_blake256(blake256_hash_state *S, const uint8_t *in, size_t inlen) {
size_t blocks, want;
/* handle the previous data */
if(S->leftover) {
want = (SCRYPT_HASH_BLOCK_SIZE - S->leftover);
want = (want < inlen) ? want : inlen;
memcpy(S->buffer + S->leftover, in, want);
S->leftover += (uint32_t)want;
if(S->leftover < SCRYPT_HASH_BLOCK_SIZE)
return;
in += want;
inlen -= want;
blake256_blocks(S, S->buffer, 1);
}
/* handle the current data */
blocks = (inlen & ~(SCRYPT_HASH_BLOCK_SIZE - 1));
S->leftover = (uint32_t)(inlen - blocks);
if(blocks) {
blake256_blocks(S, in, blocks / SCRYPT_HASH_BLOCK_SIZE);
in += blocks;
}
/* handle leftover data */
if(S->leftover)
memcpy(S->buffer, in, S->leftover);
}
static void neoscrypt_hash_finish_blake256(blake256_hash_state *S, uint8_t *hash) {
uint32_t th, tl, bits;
bits = (S->leftover << 3);
tl = S->T[0] + bits;
th = S->T[1];
if(S->leftover == 0) {
S->T[0] = (uint32_t)0 - (uint32_t)512;
S->T[1] = (uint32_t)0 - (uint32_t)1;
} else if(S->T[0] == 0) {
S->T[0] = ((uint32_t)0 - (uint32_t)512) + bits;
S->T[1] = S->T[1] - 1;
} else {
S->T[0] -= (512 - bits);
}
S->buffer[S->leftover] = 0x80;
if(S->leftover <= 55) {
memset(S->buffer + S->leftover + 1, 0, 55 - S->leftover);
} else {
memset(S->buffer + S->leftover + 1, 0, 63 - S->leftover);
blake256_blocks(S, S->buffer, 1);
S->T[0] = (uint32_t)0 - (uint32_t)512;
S->T[1] = (uint32_t)0 - (uint32_t)1;
memset(S->buffer, 0, 56);
}
S->buffer[55] |= 1;
U32TO8_BE(S->buffer + 56, th);
U32TO8_BE(S->buffer + 60, tl);
blake256_blocks(S, S->buffer, 1);
U32TO8_BE(&hash[ 0], S->H[0]);
U32TO8_BE(&hash[ 4], S->H[1]);
U32TO8_BE(&hash[ 8], S->H[2]);
U32TO8_BE(&hash[12], S->H[3]);
U32TO8_BE(&hash[16], S->H[4]);
U32TO8_BE(&hash[20], S->H[5]);
U32TO8_BE(&hash[24], S->H[6]);
U32TO8_BE(&hash[28], S->H[7]);
}
static void neoscrypt_hash_blake256(hash_digest hash, const uint8_t *m, size_t mlen) {
blake256_hash_state st;
neoscrypt_hash_init_blake256(&st);
neoscrypt_hash_update_blake256(&st, m, mlen);
neoscrypt_hash_finish_blake256(&st, hash);
}
/* HMAC for BLAKE-256 */
typedef struct blake256_hmac_state_t {
blake256_hash_state inner, outer;
} blake256_hmac_state;
static void neoscrypt_hmac_init_blake256(blake256_hmac_state *st, const uint8_t *key, size_t keylen) {
uint8_t pad[SCRYPT_HASH_BLOCK_SIZE] = {0};
size_t i;
neoscrypt_hash_init_blake256(&st->inner);
neoscrypt_hash_init_blake256(&st->outer);
if(keylen <= SCRYPT_HASH_BLOCK_SIZE) {
/* use the key directly if it's <= blocksize bytes */
memcpy(pad, key, keylen);
} else {
/* if it's > blocksize bytes, hash it */
neoscrypt_hash_blake256(pad, key, keylen);
}
/* inner = (key ^ 0x36) */
/* h(inner || ...) */
for(i = 0; i < SCRYPT_HASH_BLOCK_SIZE; i++)
pad[i] ^= 0x36;
neoscrypt_hash_update_blake256(&st->inner, pad, SCRYPT_HASH_BLOCK_SIZE);
/* outer = (key ^ 0x5c) */
/* h(outer || ...) */
for(i = 0; i < SCRYPT_HASH_BLOCK_SIZE; i++)
pad[i] ^= (0x5c ^ 0x36);
neoscrypt_hash_update_blake256(&st->outer, pad, SCRYPT_HASH_BLOCK_SIZE);
}
static void neoscrypt_hmac_update_blake256(blake256_hmac_state *st, const uint8_t *m, size_t mlen) {
/* h(inner || m...) */
neoscrypt_hash_update_blake256(&st->inner, m, mlen);
}
static void neoscrypt_hmac_finish_blake256(blake256_hmac_state *st, hash_digest mac) {
/* h(inner || m) */
hash_digest innerhash;
neoscrypt_hash_finish_blake256(&st->inner, innerhash);
/* h(outer || h(inner || m)) */
neoscrypt_hash_update_blake256(&st->outer, innerhash, sizeof(innerhash));
neoscrypt_hash_finish_blake256(&st->outer, mac);
}
/* PBKDF2 for BLAKE-256 */
static void neoscrypt_pbkdf2_blake256(const uint8_t *password, size_t password_len,
const uint8_t *salt, size_t salt_len, uint64_t N, uint8_t *output, size_t output_len) {
blake256_hmac_state hmac_pw, hmac_pw_salt, work;
hash_digest ti, u;
uint8_t be[4];
uint32_t i, j, k, blocks;
/* bytes must be <= (0xffffffff - (SCRYPT_HASH_DIGEST_SIZE - 1)), which they will always be under scrypt */
/* hmac(password, ...) */
neoscrypt_hmac_init_blake256(&hmac_pw, password, password_len);
/* hmac(password, salt...) */
hmac_pw_salt = hmac_pw;
neoscrypt_hmac_update_blake256(&hmac_pw_salt, salt, salt_len);
blocks = ((uint32_t)output_len + (SCRYPT_HASH_DIGEST_SIZE - 1)) / SCRYPT_HASH_DIGEST_SIZE;
for(i = 1; i <= blocks; i++) {
/* U1 = hmac(password, salt || be(i)) */
U32TO8_BE(be, i);
work = hmac_pw_salt;
neoscrypt_hmac_update_blake256(&work, be, 4);
neoscrypt_hmac_finish_blake256(&work, ti);
memcpy(u, ti, sizeof(u));
/* T[i] = U1 ^ U2 ^ U3... */
for(j = 0; j < N - 1; j++) {
/* UX = hmac(password, U{X-1}) */
work = hmac_pw;
neoscrypt_hmac_update_blake256(&work, u, SCRYPT_HASH_DIGEST_SIZE);
neoscrypt_hmac_finish_blake256(&work, u);
/* T[i] ^= UX */
for(k = 0; k < sizeof(u); k++)
ti[k] ^= u[k];
}
memcpy(output, ti, (output_len > SCRYPT_HASH_DIGEST_SIZE) ? SCRYPT_HASH_DIGEST_SIZE : output_len);
output += SCRYPT_HASH_DIGEST_SIZE;
output_len -= SCRYPT_HASH_DIGEST_SIZE;
}
}
#endif
/* NeoScrypt */
#if defined(ASM)
extern void neoscrypt_salsa(uint *X, uint rounds);
extern void neoscrypt_salsa_tangle(uint *X, uint count);
extern void neoscrypt_chacha(uint *X, uint rounds);
extern void neoscrypt_blkcpy(void *dstp, const void *srcp, uint len);
extern void neoscrypt_blkswp(void *blkAp, void *blkBp, uint len);
extern void neoscrypt_blkxor(void *dstp, const void *srcp, uint len);
#else
/* Salsa20, rounds must be a multiple of 2 */
static void neoscrypt_salsa(uint *X, uint rounds) {
uint x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, t;
x0 = X[0]; x1 = X[1]; x2 = X[2]; x3 = X[3];
x4 = X[4]; x5 = X[5]; x6 = X[6]; x7 = X[7];
x8 = X[8]; x9 = X[9]; x10 = X[10]; x11 = X[11];
x12 = X[12]; x13 = X[13]; x14 = X[14]; x15 = X[15];
#define quarter(a, b, c, d) \
t = a + d; t = ROTL32(t, 7); b ^= t; \
t = b + a; t = ROTL32(t, 9); c ^= t; \
t = c + b; t = ROTL32(t, 13); d ^= t; \
t = d + c; t = ROTL32(t, 18); a ^= t;
for(; rounds; rounds -= 2) {
quarter( x0, x4, x8, x12);
quarter( x5, x9, x13, x1);
quarter(x10, x14, x2, x6);
quarter(x15, x3, x7, x11);
quarter( x0, x1, x2, x3);
quarter( x5, x6, x7, x4);
quarter(x10, x11, x8, x9);
quarter(x15, x12, x13, x14);
}
X[0] += x0; X[1] += x1; X[2] += x2; X[3] += x3;
X[4] += x4; X[5] += x5; X[6] += x6; X[7] += x7;
X[8] += x8; X[9] += x9; X[10] += x10; X[11] += x11;
X[12] += x12; X[13] += x13; X[14] += x14; X[15] += x15;
#undef quarter
}
/* ChaCha20, rounds must be a multiple of 2 */
static void neoscrypt_chacha(uint *X, uint rounds) {
uint x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, t;
x0 = X[0]; x1 = X[1]; x2 = X[2]; x3 = X[3];
x4 = X[4]; x5 = X[5]; x6 = X[6]; x7 = X[7];
x8 = X[8]; x9 = X[9]; x10 = X[10]; x11 = X[11];
x12 = X[12]; x13 = X[13]; x14 = X[14]; x15 = X[15];
#define quarter(a,b,c,d) \
a += b; t = d ^ a; d = ROTL32(t, 16); \
c += d; t = b ^ c; b = ROTL32(t, 12); \
a += b; t = d ^ a; d = ROTL32(t, 8); \
c += d; t = b ^ c; b = ROTL32(t, 7);
for(; rounds; rounds -= 2) {
quarter( x0, x4, x8, x12);
quarter( x1, x5, x9, x13);
quarter( x2, x6, x10, x14);
quarter( x3, x7, x11, x15);
quarter( x0, x5, x10, x15);
quarter( x1, x6, x11, x12);
quarter( x2, x7, x8, x13);
quarter( x3, x4, x9, x14);
}
X[0] += x0; X[1] += x1; X[2] += x2; X[3] += x3;
X[4] += x4; X[5] += x5; X[6] += x6; X[7] += x7;
X[8] += x8; X[9] += x9; X[10] += x10; X[11] += x11;
X[12] += x12; X[13] += x13; X[14] += x14; X[15] += x15;
#undef quarter
}
/* Fast 32-bit / 64-bit memcpy();
* len must be a multiple of 32 bytes */
static void neoscrypt_blkcpy(void *dstp, const void *srcp, uint len) {
ulong *dst = (ulong *) dstp;
ulong *src = (ulong *) srcp;
uint i;
for(i = 0; i < (len / sizeof(ulong)); i += 4) {
dst[i] = src[i];
dst[i + 1] = src[i + 1];
dst[i + 2] = src[i + 2];
dst[i + 3] = src[i + 3];
}
}
/* Fast 32-bit / 64-bit block swapper;
* len must be a multiple of 32 bytes */
static void neoscrypt_blkswp(void *blkAp, void *blkBp, uint len) {
ulong *blkA = (ulong *) blkAp;
ulong *blkB = (ulong *) blkBp;
register ulong t0, t1, t2, t3;
uint i;
for(i = 0; i < (len / sizeof(ulong)); i += 4) {
t0 = blkA[i];
t1 = blkA[i + 1];
t2 = blkA[i + 2];
t3 = blkA[i + 3];
blkA[i] = blkB[i];
blkA[i + 1] = blkB[i + 1];
blkA[i + 2] = blkB[i + 2];
blkA[i + 3] = blkB[i + 3];
blkB[i] = t0;
blkB[i + 1] = t1;
blkB[i + 2] = t2;
blkB[i + 3] = t3;
}
}
/* Fast 32-bit / 64-bit block XOR engine;
* len must be a multiple of 32 bytes */
static void neoscrypt_blkxor(void *dstp, const void *srcp, uint len) {
ulong *dst = (ulong *) dstp;
ulong *src = (ulong *) srcp;
uint i;
for(i = 0; i < (len / sizeof(ulong)); i += 4) {
dst[i] ^= src[i];
dst[i + 1] ^= src[i + 1];
dst[i + 2] ^= src[i + 2];
dst[i + 3] ^= src[i + 3];
}
}
#endif
/* 32-bit / 64-bit optimised memcpy() */
static void neoscrypt_copy(void *dstp, const void *srcp, uint len) {
ulong *dst = (ulong *) dstp;
ulong *src = (ulong *) srcp;
uint i, tail;
for(i = 0; i < (len / sizeof(ulong)); i++)
dst[i] = src[i];
tail = len & (sizeof(ulong) - 1);
if(tail) {
uchar *dstb = (uchar *) dstp;
uchar *srcb = (uchar *) srcp;
for(i = len - tail; i < len; i++)
dstb[i] = srcb[i];
}
}
/* 32-bit / 64-bit optimised memory erase aka memset() to zero */
static void neoscrypt_erase(void *dstp, uint len) {
const ulong null = 0;
ulong *dst = (ulong *) dstp;
uint i, tail;
for(i = 0; i < (len / sizeof(ulong)); i++)
dst[i] = null;
tail = len & (sizeof(ulong) - 1);
if(tail) {
uchar *dstb = (uchar *) dstp;
for(i = len - tail; i < len; i++)
dstb[i] = (uchar)null;
}
}
/* 32-bit / 64-bit optimised XOR engine */
static void neoscrypt_xor(void *dstp, const void *srcp, uint len) {
ulong *dst = (ulong *) dstp;
ulong *src = (ulong *) srcp;
uint i, tail;
for(i = 0; i < (len / sizeof(ulong)); i++)
dst[i] ^= src[i];
tail = len & (sizeof(ulong) - 1);
if(tail) {
uchar *dstb = (uchar *) dstp;
uchar *srcb = (uchar *) srcp;
for(i = len - tail; i < len; i++)
dstb[i] ^= srcb[i];
}
}
/* BLAKE2s */
#define BLAKE2S_BLOCK_SIZE 64U
#define BLAKE2S_OUT_SIZE 32U
#define BLAKE2S_KEY_SIZE 32U
/* Parameter block of 32 bytes */
typedef struct blake2s_param_t {
uchar digest_length;
uchar key_length;
uchar fanout;
uchar depth;
uint leaf_length;
uchar node_offset[6];
uchar node_depth;
uchar inner_length;
uchar salt[8];
uchar personal[8];
} blake2s_param;
/* State block of 180 bytes */
typedef struct blake2s_state_t {
uint h[8];
uint t[2];
uint f[2];
uchar buf[2 * BLAKE2S_BLOCK_SIZE];
uint buflen;
} blake2s_state;
static const uint blake2s_IV[8] = {
0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
};
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 void blake2s_compress(blake2s_state *S, const uint *buf) {
uint i;
uint m[16];
uint v[16];
neoscrypt_copy(m, buf, 64);
neoscrypt_copy(v, S, 32);
v[ 8] = blake2s_IV[0];
v[ 9] = blake2s_IV[1];
v[10] = blake2s_IV[2];
v[11] = blake2s_IV[3];
v[12] = S->t[0] ^ blake2s_IV[4];
v[13] = S->t[1] ^ blake2s_IV[5];
v[14] = S->f[0] ^ blake2s_IV[6];
v[15] = S->f[1] ^ blake2s_IV[7];
#define G(r,i,a,b,c,d) \
do { \
a = a + b + m[blake2s_sigma[r][2*i+0]]; \
d = ROTR32(d ^ a, 16); \
c = c + d; \
b = ROTR32(b ^ c, 12); \
a = a + b + m[blake2s_sigma[r][2*i+1]]; \
d = ROTR32(d ^ a, 8); \
c = c + d; \
b = ROTR32(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);
for(i = 0; i < 8; i++)
S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
#undef G
#undef ROUND
}
static void blake2s_update(blake2s_state *S, const uchar *input, uint input_size) {
uint left, fill;
while(input_size > 0) {
left = S->buflen;
fill = 2 * BLAKE2S_BLOCK_SIZE - left;
if(input_size > fill) {
/* Buffer fill */
neoscrypt_copy(S->buf + left, input, fill);
S->buflen += fill;
/* Counter increment */
S->t[0] += BLAKE2S_BLOCK_SIZE;
/* Compress */
blake2s_compress(S, (uint *) S->buf);
/* Shift buffer left */
neoscrypt_copy(S->buf, S->buf + BLAKE2S_BLOCK_SIZE, BLAKE2S_BLOCK_SIZE);
S->buflen -= BLAKE2S_BLOCK_SIZE;
input += fill;
input_size -= fill;
} else {
neoscrypt_copy(S->buf + left, input, input_size);
S->buflen += input_size;
/* Do not compress */
input += input_size;
input_size = 0;
}
}
}
static void neoscrypt_blake2s(const void *input, const uint input_size, const void *key, const uchar key_size,
void *output, const uchar output_size) {
uchar block[BLAKE2S_BLOCK_SIZE];
blake2s_param P[1];
blake2s_state S[1];
/* Initialise */
neoscrypt_erase(P, 32);
P->digest_length = output_size;
P->key_length = key_size;
P->fanout = 1;
P->depth = 1;
neoscrypt_erase(S, 180);
neoscrypt_copy(S, blake2s_IV, 32);
neoscrypt_xor(S, P, 32);
neoscrypt_erase(block, BLAKE2S_BLOCK_SIZE);
neoscrypt_copy(block, key, key_size);
blake2s_update(S, (uchar *) block, BLAKE2S_BLOCK_SIZE);
/* Update */
blake2s_update(S, (uchar *) input, input_size);
/* Finish */
if(S->buflen > BLAKE2S_BLOCK_SIZE) {
S->t[0] += BLAKE2S_BLOCK_SIZE;
blake2s_compress(S, (uint *) S->buf);
S->buflen -= BLAKE2S_BLOCK_SIZE;
neoscrypt_copy(S->buf, S->buf + BLAKE2S_BLOCK_SIZE, S->buflen);
}
S->t[0] += S->buflen;
S->f[0] = ~0U;
neoscrypt_erase(S->buf + S->buflen, 2 * BLAKE2S_BLOCK_SIZE - S->buflen);
blake2s_compress(S, (uint *) S->buf);
/* Write back */
neoscrypt_copy(output, S, output_size);
}
#define FASTKDF_BUFFER_SIZE 256U
/* FastKDF, a fast buffered key derivation function:
* FASTKDF_BUFFER_SIZE must be a power of 2;
* password_len, salt_len and output_len should not exceed FASTKDF_BUFFER_SIZE;
* prf_output_size must be <= prf_key_size; */
static void neoscrypt_fastkdf(const uchar *password, uint password_len, const uchar *salt, uint salt_len,
uint N, uchar *output, uint output_len) {
const uint stack_align = 0x40, kdf_buf_size = FASTKDF_BUFFER_SIZE,
prf_input_size = BLAKE2S_BLOCK_SIZE, prf_key_size = BLAKE2S_KEY_SIZE, prf_output_size = BLAKE2S_OUT_SIZE;
uint bufptr, a, b, i, j;
uchar *A, *B, *prf_input, *prf_key, *prf_output;
/* Align and set up the buffers in stack */
uchar stack[2 * kdf_buf_size + prf_input_size + prf_key_size + prf_output_size + stack_align];
A = &stack[stack_align & ~(stack_align - 1)];
B = &A[kdf_buf_size + prf_input_size];
prf_output = &A[2 * kdf_buf_size + prf_input_size + prf_key_size];
/* Initialise the password buffer */
if(password_len > kdf_buf_size)
password_len = kdf_buf_size;
a = kdf_buf_size / password_len;
for(i = 0; i < a; i++)
neoscrypt_copy(&A[i * password_len], &password[0], password_len);
b = kdf_buf_size - a * password_len;
if(b)
neoscrypt_copy(&A[a * password_len], &password[0], b);
neoscrypt_copy(&A[kdf_buf_size], &password[0], prf_input_size);
/* Initialise the salt buffer */
if(salt_len > kdf_buf_size)
salt_len = kdf_buf_size;
a = kdf_buf_size / salt_len;
for(i = 0; i < a; i++)
neoscrypt_copy(&B[i * salt_len], &salt[0], salt_len);
b = kdf_buf_size - a * salt_len;
if(b)
neoscrypt_copy(&B[a * salt_len], &salt[0], b);
neoscrypt_copy(&B[kdf_buf_size], &salt[0], prf_key_size);
/* The primary iteration */
for(i = 0, bufptr = 0; i < N; i++) {
/* Map the PRF input buffer */
prf_input = &A[bufptr];
/* Map the PRF key buffer */
prf_key = &B[bufptr];