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                 return -EINVAL;
  69
  70         memcpy(tctx->key, key, keylen);
  71         tctx->keylen = keylen;
  72
  73         return 0;
  74 }
  75
  76 static int crypto_blake2s_init(struct shash_desc *desc)
  77 {
  78         struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
  79         struct blake2s_state *state = shash_desc_ctx(desc);
  80         const int outlen = crypto_shash_digestsize(desc->tfm);
  81
  82         if (tctx->keylen)
  83                 blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
  84         else
  85                 blake2s_init(state, outlen);
  86
  87         return 0;
  88 }
  89
  90 static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
  91                                  unsigned int inlen)
  92 {
  93         struct blake2s_state *state = shash_desc_ctx(desc);
  94         const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
  95
  96         if (unlikely(!inlen))
  97                 return 0;
  98         if (inlen > fill) {
  99                 memcpy(state->buf + state->buflen, in, fill);
 100                 blake2s_compress_arch(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
 101                 state->buflen = 0;
 102                 in += fill;
 103                 inlen -= fill;
 104         }
 105         if (inlen > BLAKE2S_BLOCK_SIZE) {
 106                 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
 107                 /* Hash one less (full) block than strictly possible */
 108                 blake2s_compress_arch(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
 109                 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
 110                 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
 111         }
 112         memcpy(state->buf + state->buflen, in, inlen);
 113         state->buflen += inlen;
 114
 115         return 0;
 116 }
 117
 118 static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
 119 {
 120         struct blake2s_state *state = shash_desc_ctx(desc);
 121
 122         blake2s_set_lastblock(state);
 123         memset(state->buf + state->buflen, 0,
 124                BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
 125         blake2s_compress_arch(state, state->buf, 1, state->buflen);
 126         cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
 127         memcpy(out, state->h, state->outlen);
 128         memzero_explicit(state, sizeof(*state));
 129
 130         return 0;
 131 }
 132
 133 static struct shash_alg blake2s_algs[] = {{
 134         .base.cra_name          = "blake2s-128",
 135         .base.cra_driver_name   = "blake2s-128-x86",
 136         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 137         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 138         .base.cra_priority      = 200,
 139         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 140         .base.cra_module        = THIS_MODULE,
 141
 142         .digestsize             = BLAKE2S_128_HASH_SIZE,
 143         .setkey                 = crypto_blake2s_setkey,
 144         .init                   = crypto_blake2s_init,
 145         .update                 = crypto_blake2s_update,
 146         .final                  = crypto_blake2s_final,
 147         .descsize               = sizeof(struct blake2s_state),
 148 }, {
 149         .base.cra_name          = "blake2s-160",
 150         .base.cra_driver_name   = "blake2s-160-x86",
 151         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 152         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 153         .base.cra_priority      = 200,
 154         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 155         .base.cra_module        = THIS_MODULE,
 156
 157         .digestsize             = BLAKE2S_160_HASH_SIZE,
 158         .setkey                 = crypto_blake2s_setkey,
 159         .init                   = crypto_blake2s_init,
 160         .update                 = crypto_blake2s_update,
 161         .final                  = crypto_blake2s_final,
 162         .descsize               = sizeof(struct blake2s_state),
 163 }, {
 164         .base.cra_name          = "blake2s-224",
 165         .base.cra_driver_name   = "blake2s-224-x86",
 166         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 167         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 168         .base.cra_priority      = 200,
 169         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 170         .base.cra_module        = THIS_MODULE,
 171
 172         .digestsize             = BLAKE2S_224_HASH_SIZE,
 173         .setkey                 = crypto_blake2s_setkey,
 174         .init                   = crypto_blake2s_init,
 175         .update                 = crypto_blake2s_update,
 176         .final                  = crypto_blake2s_final,
 177         .descsize               = sizeof(struct blake2s_state),
 178 }, {
 179         .base.cra_name          = "blake2s-256",
 180         .base.cra_driver_name   = "blake2s-256-x86",
 181         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 182         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 183         .base.cra_priority      = 200,
 184         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 185         .base.cra_module        = THIS_MODULE,
 186
 187         .digestsize             = BLAKE2S_256_HASH_SIZE,
 188         .setkey                 = crypto_blake2s_setkey,
 189         .init                   = crypto_blake2s_init,
 190         .update                 = crypto_blake2s_update,
 191         .final                  = crypto_blake2s_final,
 192         .descsize               = sizeof(struct blake2s_state),
 193 }};
 194
 195 static int __init blake2s_mod_init(void)
 196 {
 197         if (!boot_cpu_has(X86_FEATURE_SSSE3))
 198                 return 0;
 199
 200         static_branch_enable(&blake2s_use_ssse3);
 201
 202         if (IS_ENABLED(CONFIG_AS_AVX512) &&
 203             boot_cpu_has(X86_FEATURE_AVX) &&
 204             boot_cpu_has(X86_FEATURE_AVX2) &&
 205             boot_cpu_has(X86_FEATURE_AVX512F) &&
 206             boot_cpu_has(X86_FEATURE_AVX512VL) &&
 207             cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM |
 208                               XFEATURE_MASK_AVX512, NULL))
 209                 static_branch_enable(&blake2s_use_avx512);
 210
 211         return IS_REACHABLE(CONFIG_CRYPTO_HASH) ?
 212                 crypto_register_shashes(blake2s_algs,
 213                                         ARRAY_SIZE(blake2s_algs)) : 0;
 214 }
 215
 216 static void __exit blake2s_mod_exit(void)
 217 {
 218         if (IS_REACHABLE(CONFIG_CRYPTO_HASH) && boot_cpu_has(X86_FEATURE_SSSE3))
 219                 crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
 220 }
 221
 222 module_init(blake2s_mod_init);
 223 module_exit(blake2s_mod_exit);
 224
 225 MODULE_ALIAS_CRYPTO("blake2s-128");
 226 MODULE_ALIAS_CRYPTO("blake2s-128-x86");
 227 MODULE_ALIAS_CRYPTO("blake2s-160");
 228 MODULE_ALIAS_CRYPTO("blake2s-160-x86");
 229 MODULE_ALIAS_CRYPTO("blake2s-224");
 230 MODULE_ALIAS_CRYPTO("blake2s-224-x86");
 231 MODULE_ALIAS_CRYPTO("blake2s-256");
 232 MODULE_ALIAS_CRYPTO("blake2s-256-x86");
 233 MODULE_LICENSE("GPL v2");