FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/icp/algs/blake3/blake3_generic.c

     /*
      * 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>
     */
    
    #include <sys/zfs_context.h>
    #include "blake3_impl.h"
    
    #define rotr32(x, n)    (((x) >> (n)) | ((x) << (32 - (n))))
    static inline void g(uint32_t *state, size_t a, size_t b, size_t c, size_t d,
        uint32_t x, uint32_t y)
    {
            state[a] = state[a] + state[b] + x;
            state[d] = rotr32(state[d] ^ state[a], 16);
            state[c] = state[c] + state[d];
            state[b] = rotr32(state[b] ^ state[c], 12);
            state[a] = state[a] + state[b] + y;
            state[d] = rotr32(state[d] ^ state[a], 8);
            state[c] = state[c] + state[d];
            state[b] = rotr32(state[b] ^ state[c], 7);
    }
    
    static inline void round_fn(uint32_t state[16], const uint32_t *msg,
        size_t round)
    {
            /* Select the message schedule based on the round. */
            const uint8_t *schedule = BLAKE3_MSG_SCHEDULE[round];
    
            /* Mix the columns. */
            g(state, 0, 4, 8, 12, msg[schedule[0]], msg[schedule[1]]);
            g(state, 1, 5, 9, 13, msg[schedule[2]], msg[schedule[3]]);
            g(state, 2, 6, 10, 14, msg[schedule[4]], msg[schedule[5]]);
            g(state, 3, 7, 11, 15, msg[schedule[6]], msg[schedule[7]]);
    
            /* Mix the rows. */
            g(state, 0, 5, 10, 15, msg[schedule[8]], msg[schedule[9]]);
            g(state, 1, 6, 11, 12, msg[schedule[10]], msg[schedule[11]]);
            g(state, 2, 7, 8, 13, msg[schedule[12]], msg[schedule[13]]);
            g(state, 3, 4, 9, 14, msg[schedule[14]], msg[schedule[15]]);
    }
    
    static inline void compress_pre(uint32_t state[16], const uint32_t cv[8],
        const uint8_t block[BLAKE3_BLOCK_LEN], uint8_t block_len,
        uint64_t counter, uint8_t flags)
    {
            uint32_t block_words[16];
            block_words[0] = load32(block + 4 * 0);
            block_words[1] = load32(block + 4 * 1);
            block_words[2] = load32(block + 4 * 2);
            block_words[3] = load32(block + 4 * 3);
            block_words[4] = load32(block + 4 * 4);
            block_words[5] = load32(block + 4 * 5);
            block_words[6] = load32(block + 4 * 6);
            block_words[7] = load32(block + 4 * 7);
            block_words[8] = load32(block + 4 * 8);
            block_words[9] = load32(block + 4 * 9);
            block_words[10] = load32(block + 4 * 10);
            block_words[11] = load32(block + 4 * 11);
            block_words[12] = load32(block + 4 * 12);
            block_words[13] = load32(block + 4 * 13);
            block_words[14] = load32(block + 4 * 14);
            block_words[15] = load32(block + 4 * 15);
    
            state[0] = cv[0];
            state[1] = cv[1];
            state[2] = cv[2];
            state[3] = cv[3];
            state[4] = cv[4];
            state[5] = cv[5];
            state[6] = cv[6];
            state[7] = cv[7];
            state[8] = BLAKE3_IV[0];
            state[9] = BLAKE3_IV[1];
            state[10] = BLAKE3_IV[2];
            state[11] = BLAKE3_IV[3];
            state[12] = counter_low(counter);
            state[13] = counter_high(counter);
           state[14] = (uint32_t)block_len;
           state[15] = (uint32_t)flags;
   
           round_fn(state, &block_words[0], 0);
           round_fn(state, &block_words[0], 1);
           round_fn(state, &block_words[0], 2);
           round_fn(state, &block_words[0], 3);
           round_fn(state, &block_words[0], 4);
           round_fn(state, &block_words[0], 5);
           round_fn(state, &block_words[0], 6);
   }
   
   static inline void blake3_compress_in_place_generic(uint32_t cv[8],
       const uint8_t block[BLAKE3_BLOCK_LEN], uint8_t block_len,
       uint64_t counter, uint8_t flags)
   {
           uint32_t state[16];
           compress_pre(state, cv, block, block_len, counter, flags);
           cv[0] = state[0] ^ state[8];
           cv[1] = state[1] ^ state[9];
           cv[2] = state[2] ^ state[10];
           cv[3] = state[3] ^ state[11];
           cv[4] = state[4] ^ state[12];
           cv[5] = state[5] ^ state[13];
           cv[6] = state[6] ^ state[14];
           cv[7] = state[7] ^ state[15];
   }
   
   static inline void hash_one_generic(const uint8_t *input, size_t blocks,
       const uint32_t key[8], uint64_t counter, uint8_t flags,
       uint8_t flags_start, uint8_t flags_end, uint8_t out[BLAKE3_OUT_LEN])
   {
           uint32_t cv[8];
           memcpy(cv, key, BLAKE3_KEY_LEN);
           uint8_t block_flags = flags | flags_start;
           while (blocks > 0) {
                   if (blocks == 1) {
                           block_flags |= flags_end;
                   }
                   blake3_compress_in_place_generic(cv, input, BLAKE3_BLOCK_LEN,
                       counter, block_flags);
                   input = &input[BLAKE3_BLOCK_LEN];
                   blocks -= 1;
                   block_flags = flags;
           }
           store_cv_words(out, cv);
   }
   
   static inline void blake3_compress_xof_generic(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])
   {
           uint32_t state[16];
           compress_pre(state, cv, block, block_len, counter, flags);
   
           store32(&out[0 * 4], state[0] ^ state[8]);
           store32(&out[1 * 4], state[1] ^ state[9]);
           store32(&out[2 * 4], state[2] ^ state[10]);
           store32(&out[3 * 4], state[3] ^ state[11]);
           store32(&out[4 * 4], state[4] ^ state[12]);
           store32(&out[5 * 4], state[5] ^ state[13]);
           store32(&out[6 * 4], state[6] ^ state[14]);
           store32(&out[7 * 4], state[7] ^ state[15]);
           store32(&out[8 * 4], state[8] ^ cv[0]);
           store32(&out[9 * 4], state[9] ^ cv[1]);
           store32(&out[10 * 4], state[10] ^ cv[2]);
           store32(&out[11 * 4], state[11] ^ cv[3]);
           store32(&out[12 * 4], state[12] ^ cv[4]);
           store32(&out[13 * 4], state[13] ^ cv[5]);
           store32(&out[14 * 4], state[14] ^ cv[6]);
           store32(&out[15 * 4], state[15] ^ cv[7]);
   }
   
   static inline void blake3_hash_many_generic(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)
   {
           while (num_inputs > 0) {
                   hash_one_generic(inputs[0], blocks, key, counter, flags,
                       flags_start, flags_end, out);
                   if (increment_counter) {
                           counter += 1;
                   }
                   inputs += 1;
                   num_inputs -= 1;
                   out = &out[BLAKE3_OUT_LEN];
           }
   }
   
   static inline boolean_t blake3_is_generic_supported(void)
   {
           return (B_TRUE);
   }
   
   const blake3_ops_t blake3_generic_impl = {
           .compress_in_place = blake3_compress_in_place_generic,
           .compress_xof = blake3_compress_xof_generic,
           .hash_many = blake3_hash_many_generic,
           .is_supported = blake3_is_generic_supported,
           .degree = 4,
           .name = "generic"
   };

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