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28dcca4cc0
Sync the BLAKE2b code with the BLAKE2s code as much as possible:
- Move a lot of code into new headers <crypto/blake2b.h> and
<crypto/internal/blake2b.h>, and adjust it to be like the
corresponding BLAKE2s code, i.e. like <crypto/blake2s.h> and
<crypto/internal/blake2s.h>.
- Rename constants, e.g. BLAKE2B_*_DIGEST_SIZE => BLAKE2B_*_HASH_SIZE.
- Use a macro BLAKE2B_ALG() to define the shash_alg structs.
- Export blake2b_compress_generic() for use as a fallback.
This makes it much easier to add optimized implementations of BLAKE2b,
as optimized implementations can use the helper functions
crypto_blake2b_{setkey,init,update,final}() and
blake2b_compress_generic(). The ARM implementation will use these.
But this change is also helpful because it eliminates unnecessary
differences between the BLAKE2b and BLAKE2s code, so that the same
improvements can easily be made to both. (The two algorithms are
basically identical, except for the word size and constants.) It also
makes it straightforward to add a library API for BLAKE2b in the future
if/when it's needed.
This change does make the BLAKE2b code slightly more complicated than it
needs to be, as it doesn't actually provide a library API yet. For
example, __blake2b_update() doesn't really need to exist yet; it could
just be inlined into crypto_blake2b_update(). But I believe this is
outweighed by the benefits of keeping the code in sync.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
191 lines
5.9 KiB
C
191 lines
5.9 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 : https://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/kernel.h>
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#include <linux/bitops.h>
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#include <crypto/internal/blake2b.h>
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#include <crypto/internal/hash.h>
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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_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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#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_one_generic(struct blake2b_state *S,
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const u8 block[BLAKE2B_BLOCK_SIZE])
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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_IV0;
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v[ 9] = BLAKE2B_IV1;
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v[10] = BLAKE2B_IV2;
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v[11] = BLAKE2B_IV3;
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v[12] = BLAKE2B_IV4 ^ S->t[0];
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v[13] = BLAKE2B_IV5 ^ S->t[1];
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v[14] = BLAKE2B_IV6 ^ S->f[0];
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v[15] = BLAKE2B_IV7 ^ 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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#ifdef CONFIG_CC_IS_CLANG
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#pragma nounroll /* https://bugs.llvm.org/show_bug.cgi?id=45803 */
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#endif
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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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void blake2b_compress_generic(struct blake2b_state *state,
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const u8 *block, size_t nblocks, u32 inc)
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{
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do {
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blake2b_increment_counter(state, inc);
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blake2b_compress_one_generic(state, block);
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block += BLAKE2B_BLOCK_SIZE;
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} while (--nblocks);
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}
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EXPORT_SYMBOL(blake2b_compress_generic);
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static int crypto_blake2b_update_generic(struct shash_desc *desc,
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const u8 *in, unsigned int inlen)
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{
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return crypto_blake2b_update(desc, in, inlen, blake2b_compress_generic);
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}
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static int crypto_blake2b_final_generic(struct shash_desc *desc, u8 *out)
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{
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return crypto_blake2b_final(desc, out, blake2b_compress_generic);
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}
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#define BLAKE2B_ALG(name, driver_name, digest_size) \
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{ \
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.base.cra_name = name, \
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.base.cra_driver_name = driver_name, \
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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_BLOCK_SIZE, \
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.base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx), \
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.base.cra_module = THIS_MODULE, \
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.digestsize = digest_size, \
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.setkey = crypto_blake2b_setkey, \
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.init = crypto_blake2b_init, \
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.update = crypto_blake2b_update_generic, \
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.final = crypto_blake2b_final_generic, \
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.descsize = sizeof(struct blake2b_state), \
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}
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static struct shash_alg blake2b_algs[] = {
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BLAKE2B_ALG("blake2b-160", "blake2b-160-generic",
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BLAKE2B_160_HASH_SIZE),
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BLAKE2B_ALG("blake2b-256", "blake2b-256-generic",
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BLAKE2B_256_HASH_SIZE),
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BLAKE2B_ALG("blake2b-384", "blake2b-384-generic",
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BLAKE2B_384_HASH_SIZE),
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BLAKE2B_ALG("blake2b-512", "blake2b-512-generic",
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BLAKE2B_512_HASH_SIZE),
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};
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static int __init blake2b_mod_init(void)
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{
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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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