arch/x86/crypto/blake2s-glue.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /*
   3  * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
   4  */
   5
   6 #include <crypto/internal/blake2s.h>
   7 #include <crypto/internal/simd.h>
   8 #include <crypto/internal/hash.h>
   9
  10 #include <linux/types.h>
  11 #include <linux/jump_label.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14
  15 #include <asm/cpufeature.h>
  16 #include <asm/fpu/api.h>
  17 #include <asm/processor.h>
  18 #include <asm/simd.h>
  19
  20 asmlinkage void blake2s_compress_ssse3(struct blake2s_state *state,
  21                                        const u8 *block, const size_t nblocks,
  22                                        const u32 inc);
  23 asmlinkage void blake2s_compress_avx512(struct blake2s_state *state,
  24                                         const u8 *block, const size_t nblocks,
  25                                         const u32 inc);
  26
  27 static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_ssse3);
  28 static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_avx512);
  29
  30 void blake2s_compress_arch(struct blake2s_state *state,
  31                            const u8 *block, size_t nblocks,
  32                            const u32 inc)
  33 {
  34         /* SIMD disables preemption, so relax after processing each page. */
  35         BUILD_BUG_ON(PAGE_SIZE / BLAKE2S_BLOCK_SIZE < 8);
  36
  37         if (!static_branch_likely(&blake2s_use_ssse3) || !crypto_simd_usable()) {
  38                 blake2s_compress_generic(state, block, nblocks, inc);
  39                 return;
  40         }
  41
  42         for (;;) {
  43                 const size_t blocks = min_t(size_t, nblocks,
  44                                             PAGE_SIZE / BLAKE2S_BLOCK_SIZE);
  45
  46                 kernel_fpu_begin();
  47                 if (IS_ENABLED(CONFIG_AS_AVX512) &&
  48                     static_branch_likely(&blake2s_use_avx512))
  49                         blake2s_compress_avx512(state, block, blocks, inc);
  50                 else
  51                         blake2s_compress_ssse3(state, block, blocks, inc);
  52                 kernel_fpu_end();
  53
  54                 nblocks -= blocks;
  55                 if (!nblocks)
  56                         break;
  57                 block += blocks * BLAKE2S_BLOCK_SIZE;
  58         }
  59 }
  60 EXPORT_SYMBOL(blake2s_compress_arch);
  61
  62 static int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key,
  63                                  unsigned int keylen)
  64 {
  65         struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
  66
  67         if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE) {
  68                 crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
  69                 return -EINVAL;
  70         }
  71
  72         memcpy(tctx->key, key, keylen);
  73         tctx->keylen = keylen;
  74
  75         return 0;
  76 }
  77
  78 static int crypto_blake2s_init(struct shash_desc *desc)
  79 {
  80         struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
  81         struct blake2s_state *state = shash_desc_ctx(desc);
  82         const int outlen = crypto_shash_digestsize(desc->tfm);
  83
  84         if (tctx->keylen)
  85                 blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
  86         else
  87                 blake2s_init(state, outlen);
  88
  89         return 0;
  90 }
  91
  92 static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
  93                                  unsigned int inlen)
  94 {
  95         struct blake2s_state *state = shash_desc_ctx(desc);
  96         const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
  97
  98         if (unlikely(!inlen))
  99                 return 0;
 100         if (inlen > fill) {
 101                 memcpy(state->buf + state->buflen, in, fill);
 102                 blake2s_compress_arch(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
 103                 state->buflen = 0;
 104                 in += fill;
 105                 inlen -= fill;
 106         }
 107         if (inlen > BLAKE2S_BLOCK_SIZE) {
 108                 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
 109                 /* Hash one less (full) block than strictly possible */
 110                 blake2s_compress_arch(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
 111                 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
 112                 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
 113         }
 114         memcpy(state->buf + state->buflen, in, inlen);
 115         state->buflen += inlen;
 116
 117         return 0;
 118 }
 119
 120 static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
 121 {
 122         struct blake2s_state *state = shash_desc_ctx(desc);
 123
 124         blake2s_set_lastblock(state);
 125         memset(state->buf + state->buflen, 0,
 126                BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
 127         blake2s_compress_arch(state, state->buf, 1, state->buflen);
 128         cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
 129         memcpy(out, state->h, state->outlen);
 130         memzero_explicit(state, sizeof(*state));
 131
 132         return 0;
 133 }
 134
 135 static struct shash_alg blake2s_algs[] = {{
 136         .base.cra_name          = "blake2s-128",
 137         .base.cra_driver_name   = "blake2s-128-x86",
 138         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 139         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 140         .base.cra_priority      = 200,
 141         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 142         .base.cra_module        = THIS_MODULE,
 143
 144         .digestsize             = BLAKE2S_128_HASH_SIZE,
 145         .setkey                 = crypto_blake2s_setkey,
 146         .init                   = crypto_blake2s_init,
 147         .update                 = crypto_blake2s_update,
 148         .final                  = crypto_blake2s_final,
 149         .descsize               = sizeof(struct blake2s_state),
 150 }, {
 151         .base.cra_name          = "blake2s-160",
 152         .base.cra_driver_name   = "blake2s-160-x86",
 153         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 154         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 155         .base.cra_priority      = 200,
 156         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 157         .base.cra_module        = THIS_MODULE,
 158
 159         .digestsize             = BLAKE2S_160_HASH_SIZE,
 160         .setkey                 = crypto_blake2s_setkey,
 161         .init                   = crypto_blake2s_init,
 162         .update                 = crypto_blake2s_update,
 163         .final                  = crypto_blake2s_final,
 164         .descsize               = sizeof(struct blake2s_state),
 165 }, {
 166         .base.cra_name          = "blake2s-224",
 167         .base.cra_driver_name   = "blake2s-224-x86",
 168         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 169         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 170         .base.cra_priority      = 200,
 171         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 172         .base.cra_module        = THIS_MODULE,
 173
 174         .digestsize             = BLAKE2S_224_HASH_SIZE,
 175         .setkey                 = crypto_blake2s_setkey,
 176         .init                   = crypto_blake2s_init,
 177         .update                 = crypto_blake2s_update,
 178         .final                  = crypto_blake2s_final,
 179         .descsize               = sizeof(struct blake2s_state),
 180 }, {
 181         .base.cra_name          = "blake2s-256",
 182         .base.cra_driver_name   = "blake2s-256-x86",
 183         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 184         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 185         .base.cra_priority      = 200,
 186         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 187         .base.cra_module        = THIS_MODULE,
 188
 189         .digestsize             = BLAKE2S_256_HASH_SIZE,
 190         .setkey                 = crypto_blake2s_setkey,
 191         .init                   = crypto_blake2s_init,
 192         .update                 = crypto_blake2s_update,
 193         .final                  = crypto_blake2s_final,
 194         .descsize               = sizeof(struct blake2s_state),
 195 }};
 196
 197 static int __init blake2s_mod_init(void)
 198 {
 199         if (!boot_cpu_has(X86_FEATURE_SSSE3))
 200                 return 0;
 201
 202         static_branch_enable(&blake2s_use_ssse3);
 203
 204         if (IS_ENABLED(CONFIG_AS_AVX512) &&
 205             boot_cpu_has(X86_FEATURE_AVX) &&
 206             boot_cpu_has(X86_FEATURE_AVX2) &&
 207             boot_cpu_has(X86_FEATURE_AVX512F) &&
 208             boot_cpu_has(X86_FEATURE_AVX512VL) &&
 209             cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM |
 210                               XFEATURE_MASK_AVX512, NULL))
 211                 static_branch_enable(&blake2s_use_avx512);
 212
 213         return IS_REACHABLE(CONFIG_CRYPTO_HASH) ?
 214                 crypto_register_shashes(blake2s_algs,
 215                                         ARRAY_SIZE(blake2s_algs)) : 0;
 216 }
 217
 218 static void __exit blake2s_mod_exit(void)
 219 {
 220         if (IS_REACHABLE(CONFIG_CRYPTO_HASH) && boot_cpu_has(X86_FEATURE_SSSE3))
 221                 crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
 222 }
 223
 224 module_init(blake2s_mod_init);
 225 module_exit(blake2s_mod_exit);
 226
 227 MODULE_ALIAS_CRYPTO("blake2s-128");
 228 MODULE_ALIAS_CRYPTO("blake2s-128-x86");
 229 MODULE_ALIAS_CRYPTO("blake2s-160");
 230 MODULE_ALIAS_CRYPTO("blake2s-160-x86");
 231 MODULE_ALIAS_CRYPTO("blake2s-224");
 232 MODULE_ALIAS_CRYPTO("blake2s-224-x86");
 233 MODULE_ALIAS_CRYPTO("blake2s-256");
 234 MODULE_ALIAS_CRYPTO("blake2s-256-x86");
 235 MODULE_LICENSE("GPL v2");