From afcd3065a83b8649e8021fb56ec14d3f9535ce12 Mon Sep 17 00:00:00 2001 From: feilong Date: Sat, 23 Oct 2021 19:09:41 +0800 Subject: [PATCH] add notbook option --- .../file_hash.json" | 3 +- .../file_hash.md" | 209 ++++++++++++++++++ 2 files changed, 210 insertions(+), 2 deletions(-) diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/2.\346\226\207\344\273\266\347\232\204\350\257\273\345\206\231/file_hash.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/2.\346\226\207\344\273\266\347\232\204\350\257\273\345\206\231/file_hash.json" index 6b783ab..0636762 100644 --- "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/2.\346\226\207\344\273\266\347\232\204\350\257\273\345\206\231/file_hash.json" +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/2.\346\226\207\344\273\266\347\232\204\350\257\273\345\206\231/file_hash.json" @@ -1,6 +1,5 @@ { "type": "code_options", "author": "幻灰龙", - "source": "file_hash.md", - "notebook": "file_hash.c" + "source": "file_hash.md" } \ No newline at end of file diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/2.\346\226\207\344\273\266\347\232\204\350\257\273\345\206\231/file_hash.md" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/2.\346\226\207\344\273\266\347\232\204\350\257\273\345\206\231/file_hash.md" index fcbc617..48d6ec3 100644 --- "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/2.\346\226\207\344\273\266\347\232\204\350\257\273\345\206\231/file_hash.md" +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/2.\346\226\207\344\273\266\347\232\204\350\257\273\345\206\231/file_hash.md" @@ -5,6 +5,215 @@ * [sha256.h](https://codechina.csdn.net/csdn/skill_tree_c/-/tree/master/data/3.C%E8%AF%AD%E8%A8%80%E9%AB%98%E9%98%B6/5.%E6%96%87%E4%BB%B6/2.%E6%96%87%E4%BB%B6%E7%9A%84%E8%AF%BB%E5%86%99/sha256.h) * [sha256.c](https://codechina.csdn.net/csdn/skill_tree_c/-/tree/master/data/3.C%E8%AF%AD%E8%A8%80%E9%AB%98%E9%98%B6/5.%E6%96%87%E4%BB%B6/2.%E6%96%87%E4%BB%B6%E7%9A%84%E8%AF%BB%E5%86%99/sha256.c) +## template + +```c +/* + MIT License + Copyright (c) 2020 LekKit https://github.com/LekKit + Permission is hereby granted, free of charge, to any person obtaining a copy + of this software and associated documentation files (the "Software"), to + deal in the Software without restriction, including without limitation the + rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + sell copies of the Software, and to permit persons to whom the Software is + furnished to do so, subject to the following conditions: + The above copyright notice and this permission notice shall be included in + all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED + "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT + LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR + PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +*/ + +/* Details of the implementation, etc can be found here: + https://en.wikipedia.org/wiki/SHA-2 See sha256.h for short documentation on + library usage */ + +#include +#include +#include +#include + +struct sha256_buff { + uint64_t data_size; + uint32_t h[8]; + uint8_t last_chunk[64]; + uint8_t chunk_size; +}; + +void sha256_init(struct sha256_buff *buff) { + buff->h[0] = 0x6a09e667; + buff->h[1] = 0xbb67ae85; + buff->h[2] = 0x3c6ef372; + buff->h[3] = 0xa54ff53a; + buff->h[4] = 0x510e527f; + buff->h[5] = 0x9b05688c; + buff->h[6] = 0x1f83d9ab; + buff->h[7] = 0x5be0cd19; + buff->data_size = 0; + buff->chunk_size = 0; +} + +const static uint32_t k[64] = { + 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, + 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, + 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, + 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, + 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, + 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, + 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, + 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, + 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, + 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, + 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2}; + +#define rotate_r(val, bits) (val >> bits | val << (32 - bits)) + +static void sha256_calc_chunk(struct sha256_buff *buff, const uint8_t *chunk) { + uint32_t w[64]; + uint32_t tv[8]; + uint32_t i; + + for (i = 0; i < 16; ++i) { + w[i] = (uint32_t)chunk[0] << 24 | (uint32_t)chunk[1] << 16 | + (uint32_t)chunk[2] << 8 | (uint32_t)chunk[3]; + chunk += 4; + } + + for (i = 16; i < 64; ++i) { + uint32_t s0 = + rotate_r(w[i - 15], 7) ^ rotate_r(w[i - 15], 18) ^ (w[i - 15] >> 3); + uint32_t s1 = + rotate_r(w[i - 2], 17) ^ rotate_r(w[i - 2], 19) ^ (w[i - 2] >> 10); + w[i] = w[i - 16] + s0 + w[i - 7] + s1; + } + + for (i = 0; i < 8; ++i) + tv[i] = buff->h[i]; + + for (i = 0; i < 64; ++i) { + uint32_t S1 = + rotate_r(tv[4], 6) ^ rotate_r(tv[4], 11) ^ rotate_r(tv[4], 25); + uint32_t ch = (tv[4] & tv[5]) ^ (~tv[4] & tv[6]); + uint32_t temp1 = tv[7] + S1 + ch + k[i] + w[i]; + uint32_t S0 = + rotate_r(tv[0], 2) ^ rotate_r(tv[0], 13) ^ rotate_r(tv[0], 22); + uint32_t maj = (tv[0] & tv[1]) ^ (tv[0] & tv[2]) ^ (tv[1] & tv[2]); + uint32_t temp2 = S0 + maj; + + tv[7] = tv[6]; + tv[6] = tv[5]; + tv[5] = tv[4]; + tv[4] = tv[3] + temp1; + tv[3] = tv[2]; + tv[2] = tv[1]; + tv[1] = tv[0]; + tv[0] = temp1 + temp2; + } + + for (i = 0; i < 8; ++i) + buff->h[i] += tv[i]; +} + +void sha256_update(struct sha256_buff *buff, const void *data, size_t size) { + const uint8_t *ptr = (const uint8_t *)data; + buff->data_size += size; + /* If there is data left in buff, concatenate it to process as new chunk */ + if (size + buff->chunk_size >= 64) { + uint8_t tmp_chunk[64]; + memcpy(tmp_chunk, buff->last_chunk, buff->chunk_size); + memcpy(tmp_chunk + buff->chunk_size, ptr, 64 - buff->chunk_size); + ptr += (64 - buff->chunk_size); + size -= (64 - buff->chunk_size); + buff->chunk_size = 0; + sha256_calc_chunk(buff, tmp_chunk); + } + /* Run over data chunks */ + while (size >= 64) { + sha256_calc_chunk(buff, ptr); + ptr += 64; + size -= 64; + } + + /* Save remaining data in buff, will be reused on next call or finalize */ + memcpy(buff->last_chunk + buff->chunk_size, ptr, size); + buff->chunk_size += size; +} + +void sha256_finalize(struct sha256_buff *buff) { + buff->last_chunk[buff->chunk_size] = 0x80; + buff->chunk_size++; + memset(buff->last_chunk + buff->chunk_size, 0, 64 - buff->chunk_size); + + /* If there isn't enough space to fit int64, pad chunk with zeroes and prepare + * next chunk */ + if (buff->chunk_size > 56) { + sha256_calc_chunk(buff, buff->last_chunk); + memset(buff->last_chunk, 0, 64); + } + + /* Add total size as big-endian int64 x8 */ + uint64_t size = buff->data_size * 8; + int i; + for (i = 8; i > 0; --i) { + buff->last_chunk[55 + i] = size & 255; + size >>= 8; + } + + sha256_calc_chunk(buff, buff->last_chunk); +} + +void sha256_read(const struct sha256_buff *buff, uint8_t *hash) { + uint32_t i; + for (i = 0; i < 8; i++) { + hash[i * 4] = (buff->h[i] >> 24) & 255; + hash[i * 4 + 1] = (buff->h[i] >> 16) & 255; + hash[i * 4 + 2] = (buff->h[i] >> 8) & 255; + hash[i * 4 + 3] = buff->h[i] & 255; + } +} + +static void bin_to_hex(const void *data, uint32_t len, char *out) { + static const char *const lut = "0123456789abcdef"; + uint32_t i; + for (i = 0; i < len; ++i) { + uint8_t c = ((uint8_t *)data)[i]; + out[i * 2] = lut[c >> 4]; + out[i * 2 + 1] = lut[c & 15]; + } +} + +void sha256_read_hex(const struct sha256_buff *buff, char *hex) { + uint8_t hash[32]; + sha256_read(buff, hash); + bin_to_hex(hash, 32, hex); +} + +int main(int argc, char **argv) { + FILE *file = fopen(argv[1], "rb"); + if (!file) { + printf("Cannot open file\n"); + return 0; + } + char buffer[1024]; + size_t size; + struct sha256_buff buff; + sha256_init(&buff); + while (!feof(file)) { + /* Hash file by 1kb chunks, instead of loading into RAM at once */ + size = fread(buffer, 1, 1024, file); + sha256_update(&buff, buffer, size); + } + char hash[65] = {0}; /* hash[64] is null-byte */ + sha256_finalize(&buff); + sha256_read_hex(&buff, hash); + printf("%s\n", hash); + return 0; +} +``` + ## 答案 ```c -- GitLab