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linux/crypto/blake2b_generic.c
David Sterba e374969565 crypto: blake2b - merge blake2 init to api callback 
The call chain from blake2b_init can be simplified because the param
block is effectively zeros, besides the key.

- blake2b_init0 zeroes state and sets IV
- blake2b_init sets up param block with defaults (key and some 1s)
- init with key, write it to the input buffer and recalculate state

So the compact way is to zero out the state and initialize index 0 of
the state directly with the non-zero values and the key.

Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-11-22 18:48:34 +08:00

363 lines
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// SPDX-License-Identifier: (GPL-2.0-only OR Apache-2.0)
/*
* BLAKE2b 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:
*
* - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
* - OpenSSL license : https://www.openssl.org/source/license.html
* - Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
*
* More information about the BLAKE2 hash function can be found at
* https://blake2.net.
*
* Note: the original sources have been modified for inclusion in linux kernel
* in terms of coding style, using generic helpers and simplifications of error
* handling.
*/
#include <asm/unaligned.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <crypto/internal/hash.h>
#define BLAKE2B_160_DIGEST_SIZE (160 / 8)
#define BLAKE2B_256_DIGEST_SIZE (256 / 8)
#define BLAKE2B_384_DIGEST_SIZE (384 / 8)
#define BLAKE2B_512_DIGEST_SIZE (512 / 8)
enum blake2b_constant {
BLAKE2B_BLOCKBYTES = 128,
BLAKE2B_OUTBYTES = 64,
BLAKE2B_KEYBYTES = 64,
BLAKE2B_SALTBYTES = 16,
BLAKE2B_PERSONALBYTES = 16
};
struct blake2b_state {
u64 h[8];
u64 t[2];
u64 f[2];
u8 buf[BLAKE2B_BLOCKBYTES];
size_t buflen;
size_t outlen;
u8 last_node;
};
struct blake2b_param {
u8 digest_length; /* 1 */
u8 key_length; /* 2 */
u8 fanout; /* 3 */
u8 depth; /* 4 */
__le32 leaf_length; /* 8 */
__le32 node_offset; /* 12 */
__le32 xof_length; /* 16 */
u8 node_depth; /* 17 */
u8 inner_length; /* 18 */
u8 reserved[14]; /* 32 */
u8 salt[BLAKE2B_SALTBYTES]; /* 48 */
u8 personal[BLAKE2B_PERSONALBYTES]; /* 64 */
} __packed;
static const u64 blake2b_IV[8] = {
0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
};
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 void blake2b_update(struct blake2b_state *S, const void *pin, size_t inlen);
static void blake2b_set_lastnode(struct blake2b_state *S)
{
S->f[1] = (u64)-1;
}
static void blake2b_set_lastblock(struct blake2b_state *S)
{
if (S->last_node)
blake2b_set_lastnode(S);
S->f[0] = (u64)-1;
}
static void blake2b_increment_counter(struct blake2b_state *S, const u64 inc)
{
S->t[0] += inc;
S->t[1] += (S->t[0] < inc);
}
#define G(r,i,a,b,c,d) \
do { \
a = a + b + m[blake2b_sigma[r][2*i+0]]; \
d = ror64(d ^ a, 32); \
c = c + d; \
b = ror64(b ^ c, 24); \
a = a + b + m[blake2b_sigma[r][2*i+1]]; \
d = ror64(d ^ a, 16); \
c = c + d; \
b = ror64(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 u8 block[BLAKE2B_BLOCKBYTES])
{
u64 m[16];
u64 v[16];
size_t i;
for (i = 0; i < 16; ++i)
m[i] = get_unaligned_le64(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
static void blake2b_update(struct blake2b_state *S, const void *pin, size_t inlen)
{
const u8 *in = (const u8 *)pin;
if (inlen > 0) {
size_t left = S->buflen;
size_t fill = BLAKE2B_BLOCKBYTES - left;
if (inlen > fill) {
S->buflen = 0;
/* Fill buffer */
memcpy(S->buf + left, in, fill);
blake2b_increment_counter(S, BLAKE2B_BLOCKBYTES);
/* Compress */
blake2b_compress(S, S->buf);
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;
}
}
struct digest_tfm_ctx {
u8 key[BLAKE2B_KEYBYTES];
unsigned int keylen;
};
static int digest_setkey(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen)
{
struct digest_tfm_ctx *mctx = crypto_shash_ctx(tfm);
if (keylen == 0 || keylen > BLAKE2B_KEYBYTES) {
crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
memcpy(mctx->key, key, keylen);
mctx->keylen = keylen;
return 0;
}
static int blake2b_init(struct shash_desc *desc)
{
struct digest_tfm_ctx *mctx = crypto_shash_ctx(desc->tfm);
struct blake2b_state *state = shash_desc_ctx(desc);
const int digestsize = crypto_shash_digestsize(desc->tfm);
memset(state, 0, sizeof(*state));
memcpy(state->h, blake2b_IV, sizeof(state->h));
/* Parameter block is all zeros except index 0, no xor for 1..7 */
state->h[0] ^= 0x01010000 | mctx->keylen << 8 | digestsize;
if (mctx->keylen) {
u8 block[BLAKE2B_BLOCKBYTES];
memset(block, 0, BLAKE2B_BLOCKBYTES);
memcpy(block, mctx->key, mctx->keylen);
blake2b_update(state, block, BLAKE2B_BLOCKBYTES);
memzero_explicit(block, BLAKE2B_BLOCKBYTES);
}
return 0;
}
static int digest_update(struct shash_desc *desc, const u8 *data,
unsigned int length)
{
struct blake2b_state *state = shash_desc_ctx(desc);
blake2b_update(state, data, length);
return 0;
}
static int blake2b_final(struct shash_desc *desc, u8 *out)
{
struct blake2b_state *state = shash_desc_ctx(desc);
const int digestsize = crypto_shash_digestsize(desc->tfm);
size_t i;
blake2b_increment_counter(state, state->buflen);
blake2b_set_lastblock(state);
/* Padding */
memset(state->buf + state->buflen, 0, BLAKE2B_BLOCKBYTES - state->buflen);
blake2b_compress(state, state->buf);
/* Avoid temporary buffer and switch the internal output to LE order */
for (i = 0; i < ARRAY_SIZE(state->h); i++)
__cpu_to_le64s(&state->h[i]);
memcpy(out, state->h, digestsize);
return 0;
}
static struct shash_alg blake2b_algs[] = {
{
.base.cra_name = "blake2b-160",
.base.cra_driver_name = "blake2b-160-generic",
.base.cra_priority = 100,
.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.base.cra_blocksize = BLAKE2B_BLOCKBYTES,
.base.cra_ctxsize = sizeof(struct digest_tfm_ctx),
.base.cra_module = THIS_MODULE,
.digestsize = BLAKE2B_160_DIGEST_SIZE,
.setkey = digest_setkey,
.init = blake2b_init,
.update = digest_update,
.final = blake2b_final,
.descsize = sizeof(struct blake2b_state),
}, {
.base.cra_name = "blake2b-256",
.base.cra_driver_name = "blake2b-256-generic",
.base.cra_priority = 100,
.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.base.cra_blocksize = BLAKE2B_BLOCKBYTES,
.base.cra_ctxsize = sizeof(struct digest_tfm_ctx),
.base.cra_module = THIS_MODULE,
.digestsize = BLAKE2B_256_DIGEST_SIZE,
.setkey = digest_setkey,
.init = blake2b_init,
.update = digest_update,
.final = blake2b_final,
.descsize = sizeof(struct blake2b_state),
}, {
.base.cra_name = "blake2b-384",
.base.cra_driver_name = "blake2b-384-generic",
.base.cra_priority = 100,
.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.base.cra_blocksize = BLAKE2B_BLOCKBYTES,
.base.cra_ctxsize = sizeof(struct digest_tfm_ctx),
.base.cra_module = THIS_MODULE,
.digestsize = BLAKE2B_384_DIGEST_SIZE,
.setkey = digest_setkey,
.init = blake2b_init,
.update = digest_update,
.final = blake2b_final,
.descsize = sizeof(struct blake2b_state),
}, {
.base.cra_name = "blake2b-512",
.base.cra_driver_name = "blake2b-512-generic",
.base.cra_priority = 100,
.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.base.cra_blocksize = BLAKE2B_BLOCKBYTES,
.base.cra_ctxsize = sizeof(struct digest_tfm_ctx),
.base.cra_module = THIS_MODULE,
.digestsize = BLAKE2B_512_DIGEST_SIZE,
.setkey = digest_setkey,
.init = blake2b_init,
.update = digest_update,
.final = blake2b_final,
.descsize = sizeof(struct blake2b_state),
}
};
static int __init blake2b_mod_init(void)
{
BUILD_BUG_ON(sizeof(struct blake2b_param) != BLAKE2B_OUTBYTES);
return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
}
static void __exit blake2b_mod_fini(void)
{
crypto_unregister_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
}
subsys_initcall(blake2b_mod_init);
module_exit(blake2b_mod_fini);
MODULE_AUTHOR("David Sterba <kdave@kernel.org>");
MODULE_DESCRIPTION("BLAKE2b generic implementation");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("blake2b-160");
MODULE_ALIAS_CRYPTO("blake2b-160-generic");
MODULE_ALIAS_CRYPTO("blake2b-256");
MODULE_ALIAS_CRYPTO("blake2b-256-generic");
MODULE_ALIAS_CRYPTO("blake2b-384");
MODULE_ALIAS_CRYPTO("blake2b-384-generic");
MODULE_ALIAS_CRYPTO("blake2b-512");
MODULE_ALIAS_CRYPTO("blake2b-512-generic");
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