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/*
* BLAKE2 reference source code package - reference C implementations
*
* Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.
* You may use this under the terms of the CC0, the OpenSSL Licence, or the
* Apache Public License 2.0, at your option. The terms of these licenses can
* be found at:
*
* - OpenSSL license : https://www.openssl.org/source/license.html
* - Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
* - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
*
* More information about the BLAKE2 hash function can be found at
* https://blake2.net.
*/
/* crypto/blake2/blake2s.c */
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <openssl/crypto.h>
#include "internal/blake2_locl.h"
#include "blake2_impl.h"
static const uint32_t blake2s_IV[8] =
{
0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL, 0xA54FF53AUL,
0x510E527FUL, 0x9B05688CUL, 0x1F83D9ABUL, 0x5BE0CD19UL
};
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 } ,
};
/* Some helper functions, not necessarily useful */
static inline void blake2s_set_lastblock(BLAKE2S_CTX *S)
{
S->f[0] = -1;
}
/* Increment the data hashed couter. */
static inline void blake2s_increment_counter(BLAKE2S_CTX *S,
const uint32_t inc)
{
S->t[0] += inc;
S->t[1] += (S->t[0] < inc);
}
/* Initialize the hashing state. */
static inline void blake2s_init0(BLAKE2S_CTX *S)
{
int i;
memset(S, 0, sizeof(BLAKE2S_CTX));
for(i = 0; i < 8; ++i) {
S->h[i] = blake2s_IV[i];
}
}
/* init2 xors IV with input parameter block */
static void blake2s_init_param(BLAKE2S_CTX *S, const BLAKE2S_PARAM *P)
{
const uint32_t *p = (const uint32_t *)(P);
size_t i;
/* The param struct is carefully hand packed, and should be 32 bytes on
* every platform. */
OPENSSL_assert(sizeof(BLAKE2S_PARAM) == 32);
blake2s_init0(S);
/* IV XOR ParamBlock */
for(i = 0; i < 8; ++i) {
S->h[i] ^= load32(&p[i]);
}
}
/* Initialize the hashing context. Always returns 1. */
int BLAKE2s_Init(BLAKE2S_CTX *c)
{
BLAKE2S_PARAM P[1];
P->digest_length = BLAKE2S_DIGEST_LENGTH;
P->key_length = 0;
P->fanout = 1;
P->depth = 1;
store32(&P->leaf_length, 0);
store48(&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));
blake2s_init_param(c, P);
return 1;
}
/* Permute the state while xoring in the block of data. */
static void blake2s_compress(BLAKE2S_CTX *S,
const uint8_t block[BLAKE2S_BLOCKBYTES])
{
uint32_t m[16];
uint32_t v[16];
size_t i;
for(i = 0; i < 16; ++i) {
m[i] = load32(block + i * sizeof(m[i]));
}
for(i = 0; i < 8; ++i) {
v[i] = S->h[i];
}
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
}
/* Absorb the input data into the hash state. Always returns 1. */
int BLAKE2s_Update(BLAKE2S_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 */
blake2s_increment_counter(c, BLAKE2S_BLOCKBYTES);
blake2s_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;
}
/*
* Finalize the hash state in a way that avoids length extension attacks.
* Always returns 1.
*/
int BLAKE2s_Final(unsigned char *md, BLAKE2S_CTX *c)
{
int i;
blake2s_increment_counter(c, (uint32_t)c->buflen);
blake2s_set_lastblock(c);
/* Padding */
memset(c->buf + c->buflen, 0, sizeof(c->buf) - c->buflen);
blake2s_compress(c, c->buf);
/* Output full hash to temp buffer */
for(i = 0; i < 8; ++i) {
store32(md + sizeof(c->h[i]) * i, c->h[i]);
}
OPENSSL_cleanse(c, sizeof(BLAKE2S_CTX));
return 1;
}
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