the-tree/crypto/blake2b_generic.c

0001 // SPDX-License-Identifier: (GPL-2.0-only OR Apache-2.0)
0002 /*
0003  * Generic implementation of the BLAKE2b digest algorithm.  Based on the BLAKE2b
0004  * reference implementation, but it has been heavily modified for use in the
0005  * kernel.  The reference implementation was:
0006  *
0007  *  Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under
0008  *  the terms of the CC0, the OpenSSL Licence, or the Apache Public License
0009  *  2.0, at your option.  The terms of these licenses can be found at:
0010  *
0011  *  - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
0012  *  - OpenSSL license   : https://www.openssl.org/source/license.html
0013  *  - Apache 2.0        : https://www.apache.org/licenses/LICENSE-2.0
0014  *
0015  * More information about BLAKE2 can be found at https://blake2.net.
0016  */
0017
0018 #include <asm/unaligned.h>
0019 #include <linux/module.h>
0020 #include <linux/kernel.h>
0021 #include <linux/bitops.h>
0022 #include <crypto/internal/blake2b.h>
0023 #include <crypto/internal/hash.h>
0024
0025 static const u8 blake2b_sigma[12][16] = {
0026     {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 },
0027     { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 },
0028     { 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4 },
0029     {  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8 },
0030     {  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13 },
0031     {  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9 },
0032     { 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11 },
0033     { 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10 },
0034     {  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5 },
0035     { 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13,  0 },
0036     {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 },
0037     { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 }
0038 };
0039
0040 static void blake2b_increment_counter(struct blake2b_state *S, const u64 inc)
0041 {
0042     S->t[0] += inc;
0043     S->t[1] += (S->t[0] < inc);
0044 }
0045
0046 #define G(r,i,a,b,c,d)                                  \
0047     do {                                            \
0048         a = a + b + m[blake2b_sigma[r][2*i+0]]; \
0049         d = ror64(d ^ a, 32);                   \
0050         c = c + d;                              \
0051         b = ror64(b ^ c, 24);                   \
0052         a = a + b + m[blake2b_sigma[r][2*i+1]]; \
0053         d = ror64(d ^ a, 16);                   \
0054         c = c + d;                              \
0055         b = ror64(b ^ c, 63);                   \
0056     } while (0)
0057
0058 #define ROUND(r)                                \
0059     do {                                    \
0060         G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
0061         G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
0062         G(r,2,v[ 2],v[ 6],v[10],v[14]); \
0063         G(r,3,v[ 3],v[ 7],v[11],v[15]); \
0064         G(r,4,v[ 0],v[ 5],v[10],v[15]); \
0065         G(r,5,v[ 1],v[ 6],v[11],v[12]); \
0066         G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
0067         G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
0068     } while (0)
0069
0070 static void blake2b_compress_one_generic(struct blake2b_state *S,
0071                      const u8 block[BLAKE2B_BLOCK_SIZE])
0072 {
0073     u64 m[16];
0074     u64 v[16];
0075     size_t i;
0076
0077     for (i = 0; i < 16; ++i)
0078         m[i] = get_unaligned_le64(block + i * sizeof(m[i]));
0079
0080     for (i = 0; i < 8; ++i)
0081         v[i] = S->h[i];
0082
0083     v[ 8] = BLAKE2B_IV0;
0084     v[ 9] = BLAKE2B_IV1;
0085     v[10] = BLAKE2B_IV2;
0086     v[11] = BLAKE2B_IV3;
0087     v[12] = BLAKE2B_IV4 ^ S->t[0];
0088     v[13] = BLAKE2B_IV5 ^ S->t[1];
0089     v[14] = BLAKE2B_IV6 ^ S->f[0];
0090     v[15] = BLAKE2B_IV7 ^ S->f[1];
0091
0092     ROUND(0);
0093     ROUND(1);
0094     ROUND(2);
0095     ROUND(3);
0096     ROUND(4);
0097     ROUND(5);
0098     ROUND(6);
0099     ROUND(7);
0100     ROUND(8);
0101     ROUND(9);
0102     ROUND(10);
0103     ROUND(11);
0104 #ifdef CONFIG_CC_IS_CLANG
0105 #pragma nounroll /* https://bugs.llvm.org/show_bug.cgi?id=45803 */
0106 #endif
0107     for (i = 0; i < 8; ++i)
0108         S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
0109 }
0110
0111 #undef G
0112 #undef ROUND
0113
0114 void blake2b_compress_generic(struct blake2b_state *state,
0115                   const u8 *block, size_t nblocks, u32 inc)
0116 {
0117     do {
0118         blake2b_increment_counter(state, inc);
0119         blake2b_compress_one_generic(state, block);
0120         block += BLAKE2B_BLOCK_SIZE;
0121     } while (--nblocks);
0122 }
0123 EXPORT_SYMBOL(blake2b_compress_generic);
0124
0125 static int crypto_blake2b_update_generic(struct shash_desc *desc,
0126                      const u8 *in, unsigned int inlen)
0127 {
0128     return crypto_blake2b_update(desc, in, inlen, blake2b_compress_generic);
0129 }
0130
0131 static int crypto_blake2b_final_generic(struct shash_desc *desc, u8 *out)
0132 {
0133     return crypto_blake2b_final(desc, out, blake2b_compress_generic);
0134 }
0135
0136 #define BLAKE2B_ALG(name, driver_name, digest_size)         \
0137     {                               \
0138         .base.cra_name      = name,             \
0139         .base.cra_driver_name   = driver_name,          \
0140         .base.cra_priority  = 100,              \
0141         .base.cra_flags     = CRYPTO_ALG_OPTIONAL_KEY,  \
0142         .base.cra_blocksize = BLAKE2B_BLOCK_SIZE,       \
0143         .base.cra_ctxsize   = sizeof(struct blake2b_tfm_ctx), \
0144         .base.cra_module    = THIS_MODULE,          \
0145         .digestsize     = digest_size,          \
0146         .setkey         = crypto_blake2b_setkey,    \
0147         .init           = crypto_blake2b_init,      \
0148         .update         = crypto_blake2b_update_generic, \
0149         .final          = crypto_blake2b_final_generic, \
0150         .descsize       = sizeof(struct blake2b_state), \
0151     }
0152
0153 static struct shash_alg blake2b_algs[] = {
0154     BLAKE2B_ALG("blake2b-160", "blake2b-160-generic",
0155             BLAKE2B_160_HASH_SIZE),
0156     BLAKE2B_ALG("blake2b-256", "blake2b-256-generic",
0157             BLAKE2B_256_HASH_SIZE),
0158     BLAKE2B_ALG("blake2b-384", "blake2b-384-generic",
0159             BLAKE2B_384_HASH_SIZE),
0160     BLAKE2B_ALG("blake2b-512", "blake2b-512-generic",
0161             BLAKE2B_512_HASH_SIZE),
0162 };
0163
0164 static int __init blake2b_mod_init(void)
0165 {
0166     return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
0167 }
0168
0169 static void __exit blake2b_mod_fini(void)
0170 {
0171     crypto_unregister_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
0172 }
0173
0174 subsys_initcall(blake2b_mod_init);
0175 module_exit(blake2b_mod_fini);
0176
0177 MODULE_AUTHOR("David Sterba <kdave@kernel.org>");
0178 MODULE_DESCRIPTION("BLAKE2b generic implementation");
0179 MODULE_LICENSE("GPL");
0180 MODULE_ALIAS_CRYPTO("blake2b-160");
0181 MODULE_ALIAS_CRYPTO("blake2b-160-generic");
0182 MODULE_ALIAS_CRYPTO("blake2b-256");
0183 MODULE_ALIAS_CRYPTO("blake2b-256-generic");
0184 MODULE_ALIAS_CRYPTO("blake2b-384");
0185 MODULE_ALIAS_CRYPTO("blake2b-384-generic");
0186 MODULE_ALIAS_CRYPTO("blake2b-512");
0187 MODULE_ALIAS_CRYPTO("blake2b-512-generic");