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linux/crypto/blake2b_generic.c
Arnd Bergmann 0c0408e86d crypto: blake2b - Fix clang optimization for ARMv7-M 
When building for ARMv7-M, clang-9 or higher tries to unroll some loops,
which ends up confusing the register allocator to the point of generating
rather bad code and using more than the warning limit for stack frames:

warning: stack frame size of 1200 bytes in function 'blake2b_compress' [-Wframe-larger-than=]

Forcing it to not unroll the final loop avoids this problem.

Fixes: 91d689337f ("crypto: blake2b - add blake2b generic implementation")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2020-05-15 16:15:00 +10:00

321 lines
9.3 KiB
C
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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_KEYBYTES = 64,
};
struct blake2b_state {
u64 h[8];
u64 t[2];
u64 f[2];
u8 buf[BLAKE2B_BLOCKBYTES];
size_t buflen;
};
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_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);
#ifdef CONFIG_CC_IS_CLANG
#pragma nounroll /* https://bugs.llvm.org/show_bug.cgi?id=45803 */
#endif
for (i = 0; i < 8; ++i)
S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
}
#undef G
#undef ROUND
struct blake2b_tfm_ctx {
u8 key[BLAKE2B_KEYBYTES];
unsigned int keylen;
};
static int blake2b_setkey(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen)
{
struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
if (keylen == 0 || keylen > BLAKE2B_KEYBYTES)
return -EINVAL;
memcpy(tctx->key, key, keylen);
tctx->keylen = keylen;
return 0;
}
static int blake2b_init(struct shash_desc *desc)
{
struct blake2b_tfm_ctx *tctx = 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 | tctx->keylen << 8 | digestsize;
if (tctx->keylen) {
/*
* Prefill the buffer with the key, next call to _update or
* _final will process it
*/
memcpy(state->buf, tctx->key, tctx->keylen);
state->buflen = BLAKE2B_BLOCKBYTES;
}
return 0;
}
static int blake2b_update(struct shash_desc *desc, const u8 *in,
unsigned int inlen)
{
struct blake2b_state *state = shash_desc_ctx(desc);
const size_t left = state->buflen;
const size_t fill = BLAKE2B_BLOCKBYTES - left;
if (!inlen)
return 0;
if (inlen > fill) {
state->buflen = 0;
/* Fill buffer */
memcpy(state->buf + left, in, fill);
blake2b_increment_counter(state, BLAKE2B_BLOCKBYTES);
/* Compress */
blake2b_compress(state, state->buf);
in += fill;
inlen -= fill;
while (inlen > BLAKE2B_BLOCKBYTES) {
blake2b_increment_counter(state, BLAKE2B_BLOCKBYTES);
blake2b_compress(state, in);
in += BLAKE2B_BLOCKBYTES;
inlen -= BLAKE2B_BLOCKBYTES;
}
}
memcpy(state->buf + state->buflen, in, inlen);
state->buflen += inlen;
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);
/* Set last block */
state->f[0] = (u64)-1;
/* 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 blake2b_tfm_ctx),
.base.cra_module = THIS_MODULE,
.digestsize = BLAKE2B_160_DIGEST_SIZE,
.setkey = blake2b_setkey,
.init = blake2b_init,
.update = blake2b_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 blake2b_tfm_ctx),
.base.cra_module = THIS_MODULE,
.digestsize = BLAKE2B_256_DIGEST_SIZE,
.setkey = blake2b_setkey,
.init = blake2b_init,
.update = blake2b_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 blake2b_tfm_ctx),
.base.cra_module = THIS_MODULE,
.digestsize = BLAKE2B_384_DIGEST_SIZE,
.setkey = blake2b_setkey,
.init = blake2b_init,
.update = blake2b_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 blake2b_tfm_ctx),
.base.cra_module = THIS_MODULE,
.digestsize = BLAKE2B_512_DIGEST_SIZE,
.setkey = blake2b_setkey,
.init = blake2b_init,
.update = blake2b_update,
.final = blake2b_final,
.descsize = sizeof(struct blake2b_state),
}
};
static int __init blake2b_mod_init(void)
{
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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