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 #include <linux/sizes.h>
  15
  16 #include <asm/cpufeature.h>
  17 #include <asm/fpu/api.h>
  18 #include <asm/processor.h>
  19 #include <asm/simd.h>
  20
  21 asmlinkage void blake2s_compress_ssse3(struct blake2s_state *state,
  22                                        const u8 *block, const size_t nblocks,
  23                                        const u32 inc);
  24 asmlinkage void blake2s_compress_avx512(struct blake2s_state *state,
  25                                         const u8 *block, const size_t nblocks,
  26                                         const u32 inc);
  27
  28 static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_ssse3);
  29 static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_avx512);
  30
  31 void blake2s_compress_arch(struct blake2s_state *state,
  32                            const u8 *block, size_t nblocks,
  33                            const u32 inc)
  34 {
  35         /* SIMD disables preemption, so relax after processing each page. */
  36         BUILD_BUG_ON(SZ_4K / BLAKE2S_BLOCK_SIZE < 8);
  37
  38         if (!static_branch_likely(&blake2s_use_ssse3) || !crypto_simd_usable()) {
  39                 blake2s_compress_generic(state, block, nblocks, inc);
  40                 return;
  41         }
  42
  43         do {
  44                 const size_t blocks = min_t(size_t, nblocks,
  45                                             SZ_4K / BLAKE2S_BLOCK_SIZE);
  46
  47                 kernel_fpu_begin();
  48                 if (IS_ENABLED(CONFIG_AS_AVX512) &&
  49                     static_branch_likely(&blake2s_use_avx512))
  50                         blake2s_compress_avx512(state, block, blocks, inc);
  51                 else
  52                         blake2s_compress_ssse3(state, block, blocks, inc);
  53                 kernel_fpu_end();
  54
  55                 nblocks -= blocks;
  56                 block += blocks * BLAKE2S_BLOCK_SIZE;
  57         } while (nblocks);
  58 }
  59 EXPORT_SYMBOL(blake2s_compress_arch);
  60
  61 static int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key,
  62                                  unsigned int keylen)
  63 {
  64         struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
  65
  66         if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE)
  67                 return -EINVAL;
  68
  69         memcpy(tctx->key, key, keylen);
  70         tctx->keylen = keylen;
  71
  72         return 0;
  73 }
  74
  75 static int crypto_blake2s_init(struct shash_desc *desc)
  76 {
  77         struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
  78         struct blake2s_state *state = shash_desc_ctx(desc);
  79         const int outlen = crypto_shash_digestsize(desc->tfm);
  80
  81         if (tctx->keylen)
  82                 blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
  83         else
  84                 blake2s_init(state, outlen);
  85
  86         return 0;
  87 }
  88
  89 static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
  90                                  unsigned int inlen)
  91 {
  92         struct blake2s_state *state = shash_desc_ctx(desc);
  93         const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
  94
  95         if (unlikely(!inlen))
  96                 return 0;
  97         if (inlen > fill) {
  98                 memcpy(state->buf + state->buflen, in, fill);
  99                 blake2s_compress_arch(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
 100                 state->buflen = 0;
 101                 in += fill;
 102                 inlen -= fill;
 103         }
 104         if (inlen > BLAKE2S_BLOCK_SIZE) {
 105                 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
 106                 /* Hash one less (full) block than strictly possible */
 107                 blake2s_compress_arch(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
 108                 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
 109                 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
 110         }
 111         memcpy(state->buf + state->buflen, in, inlen);
 112         state->buflen += inlen;
 113
 114         return 0;
 115 }
 116
 117 static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
 118 {
 119         struct blake2s_state *state = shash_desc_ctx(desc);
 120
 121         blake2s_set_lastblock(state);
 122         memset(state->buf + state->buflen, 0,
 123                BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
 124         blake2s_compress_arch(state, state->buf, 1, state->buflen);
 125         cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
 126         memcpy(out, state->h, state->outlen);
 127         memzero_explicit(state, sizeof(*state));
 128
 129         return 0;
 130 }
 131
 132 static struct shash_alg blake2s_algs[] = {{
 133         .base.cra_name          = "blake2s-128",
 134         .base.cra_driver_name   = "blake2s-128-x86",
 135         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 136         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 137         .base.cra_priority      = 200,
 138         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 139         .base.cra_module        = THIS_MODULE,
 140
 141         .digestsize             = BLAKE2S_128_HASH_SIZE,
 142         .setkey                 = crypto_blake2s_setkey,
 143         .init                   = crypto_blake2s_init,
 144         .update                 = crypto_blake2s_update,
 145         .final                  = crypto_blake2s_final,
 146         .descsize               = sizeof(struct blake2s_state),
 147 }, {
 148         .base.cra_name          = "blake2s-160",
 149         .base.cra_driver_name   = "blake2s-160-x86",
 150         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 151         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 152         .base.cra_priority      = 200,
 153         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 154         .base.cra_module        = THIS_MODULE,
 155
 156         .digestsize             = BLAKE2S_160_HASH_SIZE,
 157         .setkey                 = crypto_blake2s_setkey,
 158         .init                   = crypto_blake2s_init,
 159         .update                 = crypto_blake2s_update,
 160         .final                  = crypto_blake2s_final,
 161         .descsize               = sizeof(struct blake2s_state),
 162 }, {
 163         .base.cra_name          = "blake2s-224",
 164         .base.cra_driver_name   = "blake2s-224-x86",
 165         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 166         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 167         .base.cra_priority      = 200,
 168         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 169         .base.cra_module        = THIS_MODULE,
 170
 171         .digestsize             = BLAKE2S_224_HASH_SIZE,
 172         .setkey                 = crypto_blake2s_setkey,
 173         .init                   = crypto_blake2s_init,
 174         .update                 = crypto_blake2s_update,
 175         .final                  = crypto_blake2s_final,
 176         .descsize               = sizeof(struct blake2s_state),
 177 }, {
 178         .base.cra_name          = "blake2s-256",
 179         .base.cra_driver_name   = "blake2s-256-x86",
 180         .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
 181         .base.cra_ctxsize       = sizeof(struct blake2s_tfm_ctx),
 182         .base.cra_priority      = 200,
 183         .base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
 184         .base.cra_module        = THIS_MODULE,
 185
 186         .digestsize             = BLAKE2S_256_HASH_SIZE,
 187         .setkey                 = crypto_blake2s_setkey,
 188         .init                   = crypto_blake2s_init,
 189         .update                 = crypto_blake2s_update,
 190         .final                  = crypto_blake2s_final,
 191         .descsize               = sizeof(struct blake2s_state),
 192 }};
 193
 194 static int __init blake2s_mod_init(void)
 195 {
 196         if (!boot_cpu_has(X86_FEATURE_SSSE3))
 197                 return 0;
 198
 199         static_branch_enable(&blake2s_use_ssse3);
 200
 201         if (IS_ENABLED(CONFIG_AS_AVX512) &&
 202             boot_cpu_has(X86_FEATURE_AVX) &&
 203             boot_cpu_has(X86_FEATURE_AVX2) &&
 204             boot_cpu_has(X86_FEATURE_AVX512F) &&
 205             boot_cpu_has(X86_FEATURE_AVX512VL) &&
 206             cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM |
 207                               XFEATURE_MASK_AVX512, NULL))
 208                 static_branch_enable(&blake2s_use_avx512);
 209
 210         return IS_REACHABLE(CONFIG_CRYPTO_HASH) ?
 211                 crypto_register_shashes(blake2s_algs,
 212                                         ARRAY_SIZE(blake2s_algs)) : 0;
 213 }
 214
 215 static void __exit blake2s_mod_exit(void)
 216 {
 217         if (IS_REACHABLE(CONFIG_CRYPTO_HASH) && boot_cpu_has(X86_FEATURE_SSSE3))
 218                 crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
 219 }
 220
 221 module_init(blake2s_mod_init);
 222 module_exit(blake2s_mod_exit);
 223
 224 MODULE_ALIAS_CRYPTO("blake2s-128");
 225 MODULE_ALIAS_CRYPTO("blake2s-128-x86");
 226 MODULE_ALIAS_CRYPTO("blake2s-160");
 227 MODULE_ALIAS_CRYPTO("blake2s-160-x86");
 228 MODULE_ALIAS_CRYPTO("blake2s-224");
 229 MODULE_ALIAS_CRYPTO("blake2s-224-x86");
 230 MODULE_ALIAS_CRYPTO("blake2s-256");
 231 MODULE_ALIAS_CRYPTO("blake2s-256-x86");
 232 MODULE_LICENSE("GPL v2");