FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/icp/algs/blake3/blake3_impl.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    
    /*
     * Based on BLAKE3 v1.3.1, https://github.com/BLAKE3-team/BLAKE3
     * Copyright (c) 2019-2020 Samuel Neves and Jack O'Connor
     * Copyright (c) 2021-2022 Tino Reichardt <milky-zfs@mcmilk.de>
     */
    
    #ifndef BLAKE3_IMPL_H
    #define BLAKE3_IMPL_H
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    #include <sys/types.h>
    #include <sys/blake3.h>
    #include <sys/simd.h>
    #include <sys/asm_linkage.h>
    
    /*
     * Methods used to define BLAKE3 assembler implementations
     */
    typedef void (*blake3_compress_in_place_f)(uint32_t cv[8],
        const uint8_t block[BLAKE3_BLOCK_LEN],
        uint8_t block_len, uint64_t counter,
        uint8_t flags);
    
    typedef void (*blake3_compress_xof_f)(const uint32_t cv[8],
        const uint8_t block[BLAKE3_BLOCK_LEN], uint8_t block_len,
        uint64_t counter, uint8_t flags, uint8_t out[64]);
    
    typedef void (*blake3_hash_many_f)(const uint8_t * const *inputs,
        size_t num_inputs, size_t blocks, const uint32_t key[8],
        uint64_t counter, boolean_t increment_counter, uint8_t flags,
        uint8_t flags_start, uint8_t flags_end, uint8_t *out);
    
    typedef boolean_t (*blake3_is_supported_f)(void);
    
    typedef struct blake3_impl_ops {
            blake3_compress_in_place_f compress_in_place;
            blake3_compress_xof_f compress_xof;
            blake3_hash_many_f hash_many;
            blake3_is_supported_f is_supported;
            int degree;
            const char *name;
    } blake3_ops_t;
    
    /* Return selected BLAKE3 implementation ops */
    extern const blake3_ops_t *blake3_impl_get_ops(void);
    
    extern const blake3_ops_t blake3_generic_impl;
    
    #if defined(__aarch64__) || \
            (defined(__x86_64) && defined(HAVE_SSE2)) || \
            (defined(__PPC64__) && defined(__LITTLE_ENDIAN__))
    extern const blake3_ops_t blake3_sse2_impl;
    #endif
    
    #if defined(__aarch64__) || \
            (defined(__x86_64) && defined(HAVE_SSE4_1)) || \
            (defined(__PPC64__) && defined(__LITTLE_ENDIAN__))
    extern const blake3_ops_t blake3_sse41_impl;
    #endif
    
    #if defined(__x86_64) && defined(HAVE_SSE4_1) && defined(HAVE_AVX2)
    extern const blake3_ops_t blake3_avx2_impl;
    #endif
    
    #if defined(__x86_64) && defined(HAVE_AVX512F) && defined(HAVE_AVX512VL)
    extern const blake3_ops_t blake3_avx512_impl;
    #endif
    
    #if defined(__x86_64)
    #define MAX_SIMD_DEGREE 16
    #else
    #define MAX_SIMD_DEGREE 4
    #endif
    
    #define MAX_SIMD_DEGREE_OR_2    (MAX_SIMD_DEGREE > 2 ? MAX_SIMD_DEGREE : 2)
   
   static const uint32_t BLAKE3_IV[8] = {
           0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL, 0xA54FF53AUL,
           0x510E527FUL, 0x9B05688CUL, 0x1F83D9ABUL, 0x5BE0CD19UL};
   
   static const uint8_t BLAKE3_MSG_SCHEDULE[7][16] = {
           {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
           {2, 6, 3, 10, 7, 0, 4, 13, 1, 11, 12, 5, 9, 14, 15, 8},
           {3, 4, 10, 12, 13, 2, 7, 14, 6, 5, 9, 0, 11, 15, 8, 1},
           {10, 7, 12, 9, 14, 3, 13, 15, 4, 0, 11, 2, 5, 8, 1, 6},
           {12, 13, 9, 11, 15, 10, 14, 8, 7, 2, 5, 3, 0, 1, 6, 4},
           {9, 14, 11, 5, 8, 12, 15, 1, 13, 3, 0, 10, 2, 6, 4, 7},
           {11, 15, 5, 0, 1, 9, 8, 6, 14, 10, 2, 12, 3, 4, 7, 13},
   };
   
   /* Find index of the highest set bit */
   static inline unsigned int highest_one(uint64_t x) {
   #if defined(__GNUC__) || defined(__clang__)
           return (63 ^ __builtin_clzll(x));
   #elif defined(_MSC_VER) && defined(IS_X86_64)
           unsigned long index;
           _BitScanReverse64(&index, x);
           return (index);
   #elif defined(_MSC_VER) && defined(IS_X86_32)
           if (x >> 32) {
                   unsigned long index;
                   _BitScanReverse(&index, x >> 32);
                   return (32 + index);
           } else {
                   unsigned long index;
                   _BitScanReverse(&index, x);
                   return (index);
           }
   #else
           unsigned int c = 0;
           if (x & 0xffffffff00000000ULL) { x >>= 32; c += 32; }
           if (x & 0x00000000ffff0000ULL) { x >>= 16; c += 16; }
           if (x & 0x000000000000ff00ULL) { x >>=  8; c +=  8; }
           if (x & 0x00000000000000f0ULL) { x >>=  4; c +=  4; }
           if (x & 0x000000000000000cULL) { x >>=  2; c +=  2; }
           if (x & 0x0000000000000002ULL) { c +=  1; }
           return (c);
   #endif
   }
   
   /* Count the number of 1 bits. */
   static inline unsigned int popcnt(uint64_t x) {
           unsigned int count = 0;
   
           while (x != 0) {
                   count += 1;
                   x &= x - 1;
           }
   
           return (count);
   }
   
   /*
    * Largest power of two less than or equal to x.
    * As a special case, returns 1 when x is 0.
    */
   static inline uint64_t round_down_to_power_of_2(uint64_t x) {
           return (1ULL << highest_one(x | 1));
   }
   
   static inline uint32_t counter_low(uint64_t counter) {
           return ((uint32_t)counter);
   }
   
   static inline uint32_t counter_high(uint64_t counter) {
           return ((uint32_t)(counter >> 32));
   }
   
   static inline uint32_t load32(const void *src) {
           const uint8_t *p = (const uint8_t *)src;
           return ((uint32_t)(p[0]) << 0) | ((uint32_t)(p[1]) << 8) |
               ((uint32_t)(p[2]) << 16) | ((uint32_t)(p[3]) << 24);
   }
   
   static inline void load_key_words(const uint8_t key[BLAKE3_KEY_LEN],
       uint32_t key_words[8]) {
           key_words[0] = load32(&key[0 * 4]);
           key_words[1] = load32(&key[1 * 4]);
           key_words[2] = load32(&key[2 * 4]);
           key_words[3] = load32(&key[3 * 4]);
           key_words[4] = load32(&key[4 * 4]);
           key_words[5] = load32(&key[5 * 4]);
           key_words[6] = load32(&key[6 * 4]);
           key_words[7] = load32(&key[7 * 4]);
   }
   
   static inline void store32(void *dst, uint32_t w) {
           uint8_t *p = (uint8_t *)dst;
           p[0] = (uint8_t)(w >> 0);
           p[1] = (uint8_t)(w >> 8);
           p[2] = (uint8_t)(w >> 16);
           p[3] = (uint8_t)(w >> 24);
   }
   
   static inline void store_cv_words(uint8_t bytes_out[32], uint32_t cv_words[8]) {
           store32(&bytes_out[0 * 4], cv_words[0]);
           store32(&bytes_out[1 * 4], cv_words[1]);
           store32(&bytes_out[2 * 4], cv_words[2]);
           store32(&bytes_out[3 * 4], cv_words[3]);
           store32(&bytes_out[4 * 4], cv_words[4]);
           store32(&bytes_out[5 * 4], cv_words[5]);
           store32(&bytes_out[6 * 4], cv_words[6]);
           store32(&bytes_out[7 * 4], cv_words[7]);
   }
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif                          /* BLAKE3_IMPL_H */

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