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/*
* Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.
* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL licenses, (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* https://www.openssl.org/source/license.html
* or in the file LICENSE in the source distribution.
*/
/*
* Derived from the BLAKE2 reference implementation written by Samuel Neves.
* More information about the BLAKE2 hash function and its implementations
* can be found at https://blake2.net.
*/
#include <string.h>
#include <openssl/crypto.h>
#include "e_os.h"
#include "blake2_locl.h"
#include "blake2_impl.h"
static const uint64_t blake2b_IV[8] =
{
0x6a09e667f3bcc908U, 0xbb67ae8584caa73bU,
0x3c6ef372fe94f82bU, 0xa54ff53a5f1d36f1U,
0x510e527fade682d1U, 0x9b05688c2b3e6c1fU,
0x1f83d9abfb41bd6bU, 0x5be0cd19137e2179U
};
static const uint8_t blake2b_sigma[12][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 } ,
{ 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 }
};
/* Set that it's the last block we'll compress */
static ossl_inline void blake2b_set_lastblock(BLAKE2B_CTX *S)
{
S->f[0] = -1;
}
/* Increment the data hashed counter. */
static ossl_inline void blake2b_increment_counter(BLAKE2B_CTX *S,
const uint64_t inc)
{
S->t[0] += inc;
S->t[1] += (S->t[0] < inc);
}
/* Initialize the hashing state. */
static ossl_inline void blake2b_init0(BLAKE2B_CTX *S)
{
int i;
memset(S, 0, sizeof(BLAKE2B_CTX));
for(i = 0; i < 8; ++i) {
S->h[i] = blake2b_IV[i];
}
}
/* init xors IV with input parameter block */
static void blake2b_init_param(BLAKE2B_CTX *S, const BLAKE2B_PARAM *P)
{
size_t i;
const uint8_t *p = (const uint8_t *)(P);
blake2b_init0(S);
/* The param struct is carefully hand packed, and should be 64 bytes on
* every platform. */
OPENSSL_assert(sizeof(BLAKE2B_PARAM) == 64);
/* IV XOR ParamBlock */
for(i = 0; i < 8; ++i) {
S->h[i] ^= load64(p + sizeof(S->h[i]) * i);
}
}
/* Initialize the hashing context. Always returns 1. */
int BLAKE2b_Init(BLAKE2B_CTX *c)
{
BLAKE2B_PARAM P[1];
P->digest_length = BLAKE2B_DIGEST_LENGTH;
P->key_length = 0;
P->fanout = 1;
P->depth = 1;
store32(P->leaf_length, 0);
store64(P->node_offset, 0);
P->node_depth = 0;
P->inner_length = 0;
memset(P->reserved, 0, sizeof(P->reserved));
memset(P->salt, 0, sizeof(P->salt));
memset(P->personal, 0, sizeof(P->personal));
blake2b_init_param(c, P);
return 1;
}
/* Permute the state while xoring in the block of data. */
static void blake2b_compress(BLAKE2B_CTX *S,
const uint8_t block[BLAKE2B_BLOCKBYTES])
{
uint64_t m[16];
uint64_t v[16];
int i;
for(i = 0; i < 16; ++i) {
m[i] = load64(block + i * sizeof(m[i]));
}
for(i = 0; i < 8; ++i) {
v[i] = S->h[i];
}
v[8] = blake2b_IV[0];
v[9] = blake2b_IV[1];
v[10] = blake2b_IV[2];
v[11] = blake2b_IV[3];
v[12] = S->t[0] ^ blake2b_IV[4];
v[13] = S->t[1] ^ blake2b_IV[5];
v[14] = S->f[0] ^ blake2b_IV[6];
v[15] = S->f[1] ^ blake2b_IV[7];
#define G(r,i,a,b,c,d) \
do { \
a = a + b + m[blake2b_sigma[r][2*i+0]]; \
d = rotr64(d ^ a, 32); \
c = c + d; \
b = rotr64(b ^ c, 24); \
a = a + b + m[blake2b_sigma[r][2*i+1]]; \
d = rotr64(d ^ a, 16); \
c = c + d; \
b = rotr64(b ^ c, 63); \
} 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);
ROUND(10);
ROUND(11);
for(i = 0; i < 8; ++i) {
S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
}
#undef G
#undef ROUND
}
/* Absorb the input data into the hash state. Always returns 1. */
int BLAKE2b_Update(BLAKE2B_CTX *c, const void *data, size_t datalen)
{
const uint8_t *in = data;
size_t fill;
while(datalen > 0) {
fill = sizeof(c->buf) - c->buflen;
/* Must be >, not >=, so that last block can be hashed differently */
if(datalen > fill) {
memcpy(c->buf + c->buflen, in, fill); /* Fill buffer */
blake2b_increment_counter(c, BLAKE2B_BLOCKBYTES);
blake2b_compress(c, c->buf); /* Compress */
c->buflen = 0;
in += fill;
datalen -= fill;
} else { /* datalen <= fill */
memcpy(c->buf + c->buflen, in, datalen);
c->buflen += datalen; /* Be lazy, do not compress */
return 1;
}
}
return 1;
}
/*
* Calculate the final hash and save it in md.
* Always returns 1.
*/
int BLAKE2b_Final(unsigned char *md, BLAKE2B_CTX *c)
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