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bird/lib/blake2b.c
Toke Høiland-Jørgensen 725d9af94a Lib: Add Blake2s and Blake2b hash functions 
The Babel MAC authentication RFC recommends implementing Blake2s as one of
the supported algorithms. In order to achieve do this, add the blake2b and
blake2s hash functions for MAC authentication. The hashing function
implementations are the reference implementations from blake2.net.

The Blake2 algorithms allow specifying an arbitrary output size, and the
Babel MAC spec says to implement Blake2s with 128-bit output. To satisfy
this, we add two different variants of each of the algorithms, one using
the default size (256 bits for Blake2s, 512 bits for Blake2b), and one
using half the default output size.

Update to BIRD coding style done by committer.
2021-06-06 16:26:58 +02:00

323 lines
7.9 KiB
C
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/*
* BIRD Library -- BLAKE2b Hash Function
*
* Based on the code from BLAKE2 reference source code package
*
* 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:
*
* - CC0 1.0 Universal : https://creativecommons.org/publicdomain/zero/1.0
* - OpenSSL license : https://www.openssl.org/source/license.html
* - Apache 2.0 : https://www.apache.org/licenses/LICENSE-2.0
*
* More information about the BLAKE2 hash function can be found at
* https://blake2.net/ web.
*/
#include "lib/mac.h"
#include "lib/blake2.h"
#include "lib/blake2-impl.h"
static const u64 blake2b_IV[8] =
{
U64(0x6a09e667f3bcc908),
U64(0xbb67ae8584caa73b),
U64(0x3c6ef372fe94f82b),
U64(0xa54ff53a5f1d36f1),
U64(0x510e527fade682d1),
U64(0x9b05688c2b3e6c1f),
U64(0x1f83d9abfb41bd6b),
U64(0x5be0cd19137e2179)
};
static const u8 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 },
};
STATIC_ASSERT(sizeof(struct blake2b_param) == BLAKE2B_OUTBYTES);
static inline void
blake2b_set_lastnode(struct blake2b_state *s)
{
s->f[1] = (u64) -1;
}
/* Some helper functions, not necessarily useful */
static inline int
blake2b_is_lastblock(const struct blake2b_state *s)
{
return s->f[0] != 0;
}
static inline void
blake2b_set_lastblock(struct blake2b_state *s)
{
if (s->last_node)
blake2b_set_lastnode(s);
s->f[0] = (u64) -1;
}
static inline void
blake2b_increment_counter(struct blake2b_state *s, const u64 inc)
{
s->t[0] += inc;
s->t[1] += (s->t[0] < inc);
}
static void
blake2b_init0(struct blake2b_state *s)
{
memset(s, 0, sizeof(struct blake2b_state));
for (uint i = 0; i < 8; ++i)
s->h[i] = blake2b_IV[i];
}
/* init xors IV with input parameter block */
int
blake2b_init_param(struct blake2b_state *s, const struct blake2b_param *p)
{
const byte *pb = (const void *) p;
blake2b_init0(s);
/* IV XOR ParamBlock */
for (uint i = 0; i < 8; ++i)
s->h[i] ^= load64(pb + sizeof(s->h[i]) * i);
s->outlen = p->digest_length;
return 0;
}
int
blake2b_init(struct blake2b_state *s, size_t outlen)
{
struct blake2b_param p[1];
if (!outlen || (outlen > BLAKE2B_OUTBYTES))
return -1;
p->digest_length = (uint8_t) outlen;
p->key_length = 0;
p->fanout = 1;
p->depth = 1;
store32(&p->leaf_length, 0);
store32(&p->node_offset, 0);
store32(&p->xof_length, 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));
return blake2b_init_param(s, p);
}
int
blake2b_init_key(struct blake2b_state *s, size_t outlen, const void *key, size_t keylen)
{
struct blake2b_param p[1];
if (!outlen || (outlen > BLAKE2B_OUTBYTES))
return -1;
if (!key || !keylen || (keylen > BLAKE2B_KEYBYTES))
return -1;
p->digest_length = (uint8_t) outlen;
p->key_length = (uint8_t) keylen;
p->fanout = 1;
p->depth = 1;
store32(&p->leaf_length, 0);
store32(&p->node_offset, 0);
store32(&p->xof_length, 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));
if (blake2b_init_param(s, p) < 0)
return -1;
{
byte block[BLAKE2B_BLOCKBYTES];
memset(block, 0, BLAKE2B_BLOCKBYTES);
memcpy(block, key, keylen);
blake2b_update(s, block, BLAKE2B_BLOCKBYTES);
secure_zero_memory(block, BLAKE2B_BLOCKBYTES); /* Burn the key from stack */
}
return 0;
}
#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)
static void
blake2b_compress(struct blake2b_state *s, const byte block[BLAKE2B_BLOCKBYTES])
{
u64 m[16];
u64 v[16];
uint 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] = blake2b_IV[4] ^ s->t[0];
v[13] = blake2b_IV[5] ^ s->t[1];
v[14] = blake2b_IV[6] ^ s->f[0];
v[15] = blake2b_IV[7] ^ s->f[1];
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
int
blake2b_update(struct blake2b_state *s, const void *pin, size_t inlen)
{
const byte *in = pin;
if (inlen > 0)
{
size_t left = s->buflen;
size_t fill = BLAKE2B_BLOCKBYTES - left;
if (inlen > fill)
{
s->buflen = 0;
memcpy(s->buf + left, in, fill); /* Fill buffer */
blake2b_increment_counter(s, BLAKE2B_BLOCKBYTES);
blake2b_compress(s, s->buf); /* Compress */
in += fill; inlen -= fill;
while (inlen > BLAKE2B_BLOCKBYTES)
{
blake2b_increment_counter(s, BLAKE2B_BLOCKBYTES);
blake2b_compress(s, in);
in += BLAKE2B_BLOCKBYTES;
inlen -= BLAKE2B_BLOCKBYTES;
}
}
memcpy(s->buf + s->buflen, in, inlen);
s->buflen += inlen;
}
return 0;
}
int
blake2b_final(struct blake2b_state *s, void *out, size_t outlen)
{
byte buffer[BLAKE2B_OUTBYTES] = {0};
if (!out || (outlen < s->outlen))
return -1;
if (blake2b_is_lastblock(s))
return -1;
blake2b_increment_counter(s, s->buflen);
blake2b_set_lastblock(s);
memset(s->buf + s->buflen, 0, BLAKE2B_BLOCKBYTES - s->buflen); /* Padding */
blake2b_compress(s, s->buf);
/* Output full hash to temp buffer */
for (uint i = 0; i < 8; ++i)
store64(buffer + sizeof(s->h[i]) * i, s->h[i]);
memcpy(out, buffer, s->outlen);
secure_zero_memory(buffer, sizeof(buffer));
return 0;
}
void
blake2b_mac_init(struct mac_context *mac, const byte *key, uint keylen)
{
struct blake2b_context *ctx = (void *) mac;
blake2b_init_key(&ctx->state, mac_get_length(mac), key, keylen);
}
void
blake2b_mac_update(struct mac_context *mac, const byte *buf, uint len)
{
struct blake2b_context *ctx = (void *) mac;
blake2b_update(&ctx->state, buf, len);
}
byte *
blake2b_mac_final(struct mac_context *mac)
{
struct blake2b_context *ctx = (void *) mac;
blake2b_final(&ctx->state, ctx->buf, mac_get_length(mac));
return ctx->buf;
}
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