mirror of
https://github.com/edk2-porting/linux-next.git
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91d689337f
The patch brings support of several BLAKE2 variants (2b with various digest lengths). The keyed digest is supported, using tfm->setkey call. The in-tree user will be btrfs (for checksumming), we're going to use the BLAKE2b-256 variant. The code is reference implementation taken from the official sources and modified in terms of kernel coding style (whitespace, comments, uintXX_t -> uXX types, removed unused prototypes and #ifdefs, removed testing code, changed secure_zero_memory -> memzero_explicit, used own helpers for unaligned reads/writes and rotations). Further changes removed sanity checks of key length or output size, these values are verified in the crypto API callbacks or hardcoded in shash_alg and not exposed to users. Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
436 lines
12 KiB
C
436 lines
12 KiB
C
// SPDX-License-Identifier: (GPL-2.0-only OR Apache-2.0)
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/*
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* BLAKE2b reference source code package - reference C implementations
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*
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* Copyright 2012, Samuel Neves <sneves@dei.uc.pt>. You may use this under the
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* terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
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* your option. The terms of these licenses can be found at:
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*
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* - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
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* - OpenSSL license : https://www.openssl.org/source/license.html
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* - Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
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*
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* More information about the BLAKE2 hash function can be found at
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* https://blake2.net.
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*
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* Note: the original sources have been modified for inclusion in linux kernel
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* in terms of coding style, using generic helpers and simplifications of error
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* handling.
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*/
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#include <asm/unaligned.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <crypto/internal/hash.h>
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#define BLAKE2B_160_DIGEST_SIZE (160 / 8)
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#define BLAKE2B_256_DIGEST_SIZE (256 / 8)
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#define BLAKE2B_384_DIGEST_SIZE (384 / 8)
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#define BLAKE2B_512_DIGEST_SIZE (512 / 8)
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enum blake2b_constant {
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BLAKE2B_BLOCKBYTES = 128,
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BLAKE2B_OUTBYTES = 64,
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BLAKE2B_KEYBYTES = 64,
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BLAKE2B_SALTBYTES = 16,
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BLAKE2B_PERSONALBYTES = 16
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};
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struct blake2b_state {
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u64 h[8];
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u64 t[2];
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u64 f[2];
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u8 buf[BLAKE2B_BLOCKBYTES];
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size_t buflen;
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size_t outlen;
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u8 last_node;
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};
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struct blake2b_param {
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u8 digest_length; /* 1 */
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u8 key_length; /* 2 */
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u8 fanout; /* 3 */
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u8 depth; /* 4 */
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__le32 leaf_length; /* 8 */
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__le32 node_offset; /* 12 */
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__le32 xof_length; /* 16 */
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u8 node_depth; /* 17 */
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u8 inner_length; /* 18 */
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u8 reserved[14]; /* 32 */
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u8 salt[BLAKE2B_SALTBYTES]; /* 48 */
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u8 personal[BLAKE2B_PERSONALBYTES]; /* 64 */
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} __packed;
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static const u64 blake2b_IV[8] = {
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0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
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0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
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0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
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0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
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};
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static const u8 blake2b_sigma[12][16] = {
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
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{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
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{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
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{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
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{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
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{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
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{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
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{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
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{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
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{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
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{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
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};
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static void blake2b_update(struct blake2b_state *S, const void *pin, size_t inlen);
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static void blake2b_set_lastnode(struct blake2b_state *S)
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{
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S->f[1] = (u64)-1;
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}
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static void blake2b_set_lastblock(struct blake2b_state *S)
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{
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if (S->last_node)
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blake2b_set_lastnode(S);
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S->f[0] = (u64)-1;
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}
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static void blake2b_increment_counter(struct blake2b_state *S, const u64 inc)
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{
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S->t[0] += inc;
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S->t[1] += (S->t[0] < inc);
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}
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static void blake2b_init0(struct blake2b_state *S)
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{
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size_t i;
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memset(S, 0, sizeof(struct blake2b_state));
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for (i = 0; i < 8; ++i)
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S->h[i] = blake2b_IV[i];
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}
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/* init xors IV with input parameter block */
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static void blake2b_init_param(struct blake2b_state *S,
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const struct blake2b_param *P)
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{
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const u8 *p = (const u8 *)(P);
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size_t i;
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blake2b_init0(S);
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/* IV XOR ParamBlock */
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for (i = 0; i < 8; ++i)
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S->h[i] ^= get_unaligned_le64(p + sizeof(S->h[i]) * i);
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S->outlen = P->digest_length;
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}
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static void blake2b_init(struct blake2b_state *S, size_t outlen)
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{
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struct blake2b_param P;
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P.digest_length = (u8)outlen;
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P.key_length = 0;
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P.fanout = 1;
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P.depth = 1;
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P.leaf_length = 0;
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P.node_offset = 0;
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P.xof_length = 0;
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P.node_depth = 0;
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P.inner_length = 0;
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memset(P.reserved, 0, sizeof(P.reserved));
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memset(P.salt, 0, sizeof(P.salt));
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memset(P.personal, 0, sizeof(P.personal));
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blake2b_init_param(S, &P);
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}
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static void blake2b_init_key(struct blake2b_state *S, size_t outlen,
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const void *key, size_t keylen)
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{
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struct blake2b_param P;
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P.digest_length = (u8)outlen;
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P.key_length = (u8)keylen;
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P.fanout = 1;
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P.depth = 1;
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P.leaf_length = 0;
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P.node_offset = 0;
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P.xof_length = 0;
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P.node_depth = 0;
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P.inner_length = 0;
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memset(P.reserved, 0, sizeof(P.reserved));
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memset(P.salt, 0, sizeof(P.salt));
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memset(P.personal, 0, sizeof(P.personal));
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blake2b_init_param(S, &P);
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{
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u8 block[BLAKE2B_BLOCKBYTES];
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memset(block, 0, BLAKE2B_BLOCKBYTES);
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memcpy(block, key, keylen);
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blake2b_update(S, block, BLAKE2B_BLOCKBYTES);
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memzero_explicit(block, BLAKE2B_BLOCKBYTES);
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}
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}
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#define G(r,i,a,b,c,d) \
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do { \
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a = a + b + m[blake2b_sigma[r][2*i+0]]; \
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d = ror64(d ^ a, 32); \
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c = c + d; \
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b = ror64(b ^ c, 24); \
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a = a + b + m[blake2b_sigma[r][2*i+1]]; \
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d = ror64(d ^ a, 16); \
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c = c + d; \
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b = ror64(b ^ c, 63); \
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} while (0)
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#define ROUND(r) \
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do { \
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G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
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G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
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G(r,2,v[ 2],v[ 6],v[10],v[14]); \
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G(r,3,v[ 3],v[ 7],v[11],v[15]); \
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G(r,4,v[ 0],v[ 5],v[10],v[15]); \
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G(r,5,v[ 1],v[ 6],v[11],v[12]); \
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G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
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G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
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} while (0)
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static void blake2b_compress(struct blake2b_state *S,
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const u8 block[BLAKE2B_BLOCKBYTES])
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{
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u64 m[16];
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u64 v[16];
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size_t i;
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for (i = 0; i < 16; ++i)
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m[i] = get_unaligned_le64(block + i * sizeof(m[i]));
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for (i = 0; i < 8; ++i)
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v[i] = S->h[i];
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v[ 8] = blake2b_IV[0];
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v[ 9] = blake2b_IV[1];
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v[10] = blake2b_IV[2];
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v[11] = blake2b_IV[3];
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v[12] = blake2b_IV[4] ^ S->t[0];
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v[13] = blake2b_IV[5] ^ S->t[1];
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v[14] = blake2b_IV[6] ^ S->f[0];
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v[15] = blake2b_IV[7] ^ S->f[1];
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ROUND(0);
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ROUND(1);
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ROUND(2);
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ROUND(3);
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ROUND(4);
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ROUND(5);
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ROUND(6);
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ROUND(7);
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ROUND(8);
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ROUND(9);
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ROUND(10);
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ROUND(11);
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for (i = 0; i < 8; ++i)
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S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
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}
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#undef G
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#undef ROUND
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static void blake2b_update(struct blake2b_state *S, const void *pin, size_t inlen)
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{
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const u8 *in = (const u8 *)pin;
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if (inlen > 0) {
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size_t left = S->buflen;
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size_t fill = BLAKE2B_BLOCKBYTES - left;
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if (inlen > fill) {
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S->buflen = 0;
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/* Fill buffer */
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memcpy(S->buf + left, in, fill);
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blake2b_increment_counter(S, BLAKE2B_BLOCKBYTES);
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/* Compress */
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blake2b_compress(S, S->buf);
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in += fill;
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inlen -= fill;
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while (inlen > BLAKE2B_BLOCKBYTES) {
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blake2b_increment_counter(S, BLAKE2B_BLOCKBYTES);
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blake2b_compress(S, in);
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in += BLAKE2B_BLOCKBYTES;
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inlen -= BLAKE2B_BLOCKBYTES;
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}
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}
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memcpy(S->buf + S->buflen, in, inlen);
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S->buflen += inlen;
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}
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}
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static void blake2b_final(struct blake2b_state *S, void *out, size_t outlen)
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{
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u8 buffer[BLAKE2B_OUTBYTES] = {0};
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size_t i;
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blake2b_increment_counter(S, S->buflen);
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blake2b_set_lastblock(S);
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/* Padding */
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memset(S->buf + S->buflen, 0, BLAKE2B_BLOCKBYTES - S->buflen);
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blake2b_compress(S, S->buf);
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/* Output full hash to temp buffer */
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for (i = 0; i < 8; ++i)
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put_unaligned_le64(S->h[i], buffer + sizeof(S->h[i]) * i);
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memcpy(out, buffer, S->outlen);
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memzero_explicit(buffer, sizeof(buffer));
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}
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struct digest_tfm_ctx {
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u8 key[BLAKE2B_KEYBYTES];
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unsigned int keylen;
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};
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static int digest_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct digest_tfm_ctx *mctx = crypto_shash_ctx(tfm);
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if (keylen == 0 || keylen > BLAKE2B_KEYBYTES) {
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crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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memcpy(mctx->key, key, keylen);
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mctx->keylen = keylen;
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return 0;
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}
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static int digest_init(struct shash_desc *desc)
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{
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struct digest_tfm_ctx *mctx = crypto_shash_ctx(desc->tfm);
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struct blake2b_state *state = shash_desc_ctx(desc);
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const int digestsize = crypto_shash_digestsize(desc->tfm);
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if (mctx->keylen == 0)
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blake2b_init(state, digestsize);
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else
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blake2b_init_key(state, digestsize, mctx->key, mctx->keylen);
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return 0;
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}
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static int digest_update(struct shash_desc *desc, const u8 *data,
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unsigned int length)
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{
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struct blake2b_state *state = shash_desc_ctx(desc);
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blake2b_update(state, data, length);
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return 0;
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}
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static int digest_final(struct shash_desc *desc, u8 *out)
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{
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struct blake2b_state *state = shash_desc_ctx(desc);
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const int digestsize = crypto_shash_digestsize(desc->tfm);
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blake2b_final(state, out, digestsize);
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return 0;
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}
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static struct shash_alg blake2b_algs[] = {
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{
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.base.cra_name = "blake2b-160",
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.base.cra_driver_name = "blake2b-160-generic",
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.base.cra_priority = 100,
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.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
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.base.cra_blocksize = BLAKE2B_BLOCKBYTES,
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.base.cra_ctxsize = sizeof(struct digest_tfm_ctx),
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.base.cra_module = THIS_MODULE,
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.digestsize = BLAKE2B_160_DIGEST_SIZE,
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.setkey = digest_setkey,
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.init = digest_init,
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.update = digest_update,
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.final = digest_final,
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.descsize = sizeof(struct blake2b_state),
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}, {
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.base.cra_name = "blake2b-256",
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.base.cra_driver_name = "blake2b-256-generic",
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.base.cra_priority = 100,
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.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
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.base.cra_blocksize = BLAKE2B_BLOCKBYTES,
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.base.cra_ctxsize = sizeof(struct digest_tfm_ctx),
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.base.cra_module = THIS_MODULE,
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.digestsize = BLAKE2B_256_DIGEST_SIZE,
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.setkey = digest_setkey,
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.init = digest_init,
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.update = digest_update,
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.final = digest_final,
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.descsize = sizeof(struct blake2b_state),
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}, {
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.base.cra_name = "blake2b-384",
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.base.cra_driver_name = "blake2b-384-generic",
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.base.cra_priority = 100,
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.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
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.base.cra_blocksize = BLAKE2B_BLOCKBYTES,
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.base.cra_ctxsize = sizeof(struct digest_tfm_ctx),
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.base.cra_module = THIS_MODULE,
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.digestsize = BLAKE2B_384_DIGEST_SIZE,
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.setkey = digest_setkey,
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.init = digest_init,
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.update = digest_update,
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.final = digest_final,
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.descsize = sizeof(struct blake2b_state),
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}, {
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.base.cra_name = "blake2b-512",
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.base.cra_driver_name = "blake2b-512-generic",
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.base.cra_priority = 100,
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.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
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.base.cra_blocksize = BLAKE2B_BLOCKBYTES,
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.base.cra_ctxsize = sizeof(struct digest_tfm_ctx),
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.base.cra_module = THIS_MODULE,
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.digestsize = BLAKE2B_512_DIGEST_SIZE,
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.setkey = digest_setkey,
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.init = digest_init,
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.update = digest_update,
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.final = digest_final,
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.descsize = sizeof(struct blake2b_state),
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}
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};
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static int __init blake2b_mod_init(void)
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{
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BUILD_BUG_ON(sizeof(struct blake2b_param) != BLAKE2B_OUTBYTES);
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return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
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}
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static void __exit blake2b_mod_fini(void)
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{
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crypto_unregister_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
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}
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subsys_initcall(blake2b_mod_init);
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module_exit(blake2b_mod_fini);
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MODULE_AUTHOR("David Sterba <kdave@kernel.org>");
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MODULE_DESCRIPTION("BLAKE2b generic implementation");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("blake2b-160");
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MODULE_ALIAS_CRYPTO("blake2b-160-generic");
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MODULE_ALIAS_CRYPTO("blake2b-256");
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MODULE_ALIAS_CRYPTO("blake2b-256-generic");
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MODULE_ALIAS_CRYPTO("blake2b-384");
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MODULE_ALIAS_CRYPTO("blake2b-384-generic");
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MODULE_ALIAS_CRYPTO("blake2b-512");
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MODULE_ALIAS_CRYPTO("blake2b-512-generic");
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