From 3cfab9ae1617a617996d170acd6b6df511e218dd Mon Sep 17 00:00:00 2001 From: feilong Date: Sat, 23 Oct 2021 18:38:55 +0800 Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E6=96=87=E4=BB=B6=E6=93=8D?= =?UTF-8?q?=E4=BD=9C?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../file01.c" | 8 + .../file01.json" | 5 + .../file01.md" | 56 +++++ .../file02.c" | 19 ++ .../file02.json" | 5 + .../file02.md" | 100 +++++++++ .../file03.c" | 27 +++ .../file03.json" | 5 + .../file03.md" | 130 +++++++++++ .../config.json" | 4 +- .../file_hash.c" | 204 ++++++++++++++++++ .../file_hash.json" | 5 + .../file_hash.md" | 129 +++++++++++ .../sha256.c" | 186 ++++++++++++++++ .../sha256.h" | 96 +++++++++ 15 files changed, 978 insertions(+), 1 deletion(-) create mode 100644 "data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.c" create mode 100644 "data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.json" create mode 100644 "data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.md" create mode 100644 "data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.c" create mode 100644 "data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.json" create mode 100644 "data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.md" create mode 100644 "data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.c" create mode 100644 "data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.json" create mode 100644 "data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.md" create mode 100644 "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.c" create mode 100644 "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" create mode 100644 "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" create mode 100644 "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/sha256.c" create mode 100644 "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/sha256.h" diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.c" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.c" new file mode 100644 index 0000000..9408913 --- /dev/null +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.c" @@ -0,0 +1,8 @@ +#include + +int main(int argc, char **args) { + FILE *file = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", file); + fclose(file); + return 0; +} \ 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\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.json" new file mode 100644 index 0000000..6f05eb3 --- /dev/null +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.json" @@ -0,0 +1,5 @@ +{ + "type": "code_options", + "author": "幻灰龙", + "source": "file01.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\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.md" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.md" new file mode 100644 index 0000000..4c5e94e --- /dev/null +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file01.md" @@ -0,0 +1,56 @@ +# 写入字符串到文件(1) + +下面正确将"Hello,World!"写入到文件的代码是？ + +## 答案 + +```c +#include + +int main(int argc, char **args) { + FILE *file = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", file); + fclose(file); + return 0; +} +``` + +## 选项 + +### 选项1 + +```c +#include + +int main(int argc, char **args) { + FILE *file = fopen("/tmp/hello.txt", "r+"); + fputs("Hello,World!\n", file); + fclose(file); + return 0; +} +``` + +### 选项2 + +```c +#include + +int main(int argc, char **args) { + FILE *file = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", file); + return 0; +} +``` + +### 选项3 + +```c +#include + +int main(int argc, char **args) { + FILE *file = fopen("/tmp/hello.txt", "w+"); + fputs(file, "Hello,World!\n"); + fclose(file); + return 0; +} +``` \ 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\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.c" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.c" new file mode 100644 index 0000000..0080877 --- /dev/null +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.c" @@ -0,0 +1,19 @@ +#include + +int main(int argc, char **args) { + // 写入 + FILE *f1 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 读取 + FILE *f2 = fopen("/tmp/hello.txt", "r+"); + char buff[1024]; + fgets(buff, 1024, f2); + fclose(f2); + + // 打印 + printf("%s", buff); + + return 0; +} \ 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\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.json" new file mode 100644 index 0000000..49ca12e --- /dev/null +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.json" @@ -0,0 +1,5 @@ +{ + "type": "code_options", + "author": "幻灰龙", + "source": "file02.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\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.md" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.md" new file mode 100644 index 0000000..0dad891 --- /dev/null +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file02.md" @@ -0,0 +1,100 @@ +# 写入字符串到文件(2) + +下面正确将"Hello,World!"写入文件，并再次打开读取出来的代码是？ + +## 答案 + +```c +#include + +int main(int argc, char **args) { + // 写入 + FILE *f1 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 读取 + FILE *f2 = fopen("/tmp/hello.txt", "r+"); + char buff[1024]; + fgets(buff, 1024, f2); + fclose(f2); + + // 打印 + printf("%s", buff); + + return 0; +} +``` + +## 选项 + +### 选项1 + +```c +#include + +int main(int argc, char **args) { + // 写入 + FILE *f1 = fopen("/tmp/hello.txt", "r+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 读取 + FILE *f2 = fopen("/tmp/hello.txt", "w+"); + char buff[1024]; + fgets(buff, 1024, f2); + fclose(f2); + + // 打印 + printf("%s", buff); + + return 0; +} +``` + +### 选项2 + +```c +#include + +int main(int argc, char **args) { + // 写入 + FILE *f1 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 读取 + FILE *f2 = fopen("/tmp/hello.txt", "r+"); + char buff[1024]; + fgets(f2, buff, 1024); + fclose(f2); + + // 打印 + printf("%s", buff); + + return 0; +} +``` + +### 选项3 + +```c +#include + +int main(int argc, char **args) { + // 写入 + FILE *f1 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 读取 + FILE *f2 = fopen("/tmp/hello.txt", "r+"); + char buff[1024]; + fgets(buff, 1024, f2); + + // 打印 + printf("%s", buff); + + return 0; +} +``` \ 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\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.c" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.c" new file mode 100644 index 0000000..9143c2d --- /dev/null +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.c" @@ -0,0 +1,27 @@ +#include + +int main(int argc, char **args) { + // 写入 + FILE *f1 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 追加 + FILE *f2 = fopen("/tmp/hello.txt", "a+"); + fputs("Hello,World!\n", f1); + fclose(f2); + + // 读取 + FILE *f3 = fopen("/tmp/hello.txt", "r+"); + char buff[1024]; + + fgets(buff, 1024, f3); + printf("%s", buff); + + fgets(buff, 1024, f3); + printf("%s", buff); + + fclose(f3); + + return 0; +} \ 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\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.json" new file mode 100644 index 0000000..d0565ea --- /dev/null +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.json" @@ -0,0 +1,5 @@ +{ + "type": "code_options", + "author": "幻灰龙", + "source": "file03.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\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.md" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.md" new file mode 100644 index 0000000..6fb2677 --- /dev/null +++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/1.\346\226\207\344\273\266\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234/file03.md" @@ -0,0 +1,130 @@ +# 写入字符串到文件(3) + +下面正确将"Hello,World!"写入文件，并再次打开追加写入"Hello,World!"，最后一次打开并读取出来打印两行"Hello,World!"的代码是？ + +## 答案 + +```c +#include + +int main(int argc, char **args) { + // 写入 + FILE *f1 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 追加 + FILE *f2 = fopen("/tmp/hello.txt", "a+"); + fputs("Hello,World!\n", f1); + fclose(f2); + + // 读取 + FILE *f3 = fopen("/tmp/hello.txt", "r+"); + char buff[1024]; + + fgets(buff, 1024, f3); + printf("%s", buff); + + fgets(buff, 1024, f3); + printf("%s", buff); + + fclose(f3); + + return 0; +} +``` + +## 选项 + +### 选项1 + +```c +#include + +int main(int argc, char **args) { + // 写入 + FILE *f1 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 追加 + FILE *f2 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f2); + + // 读取 + FILE *f3 = fopen("/tmp/hello.txt", "r+"); + char buff[1024]; + + fgets(buff, 1024, f3); + printf("%s", buff); + + fgets(buff, 1024, f3); + printf("%s", buff); + + fclose(f3); + + return 0; +} +``` + +### 选项2 + +```c +#include + +int main(int argc, char **args) { + // 写入 + FILE *f1 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 追加 + FILE *f1 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 读取 + FILE *f3 = fopen("/tmp/hello.txt", "r+"); + char buff[1024]; + + fgets(buff, 1024, f3); + printf("%s", buff); + + fgets(buff, 1024, f3); + printf("%s", buff); + + fclose(f3); + + return 0; +} +``` + +### 选项3 + +```c +#include + +int main(int argc, char **args) { + // 写入 + FILE *f1 = fopen("/tmp/hello.txt", "w+"); + fputs("Hello,World!\n", f1); + fclose(f1); + + // 追加 + FILE *f2 = fopen("/tmp/hello.txt", "a+"); + fputs("Hello,World!\n", f1); + fclose(f2); + + // 读取 + FILE *f3 = fopen("/tmp/hello.txt", "r+"); + char buff[1024]; + + fgets(buff, 1024, f3); + printf("%s", buff); + + fclose(f3); + + return 0; +} +``` \ 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/config.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/config.json" index 51bb9ca..8e1f265 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/config.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/config.json" @@ -5,5 +5,7 @@ "C语言" ], "children": [], - "export": [] + "export": [ + "file_hash.json" + ] } \ 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.c" "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.c" new file mode 100644 index 0000000..fd64110 --- /dev/null +++ "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.c" @@ -0,0 +1,204 @@ +/* + 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; +} \ 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.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" new file mode 100644 index 0000000..0636762 --- /dev/null +++ "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" @@ -0,0 +1,5 @@ +{ + "type": "code_options", + "author": "幻灰龙", + "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" new file mode 100644 index 0000000..fcbc617 --- /dev/null +++ "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" @@ -0,0 +1,129 @@ +# 计算文件到 sha256 哈希 + +下面的代码打开文件、分片读取文件二进制数据，最终计算文件的 sha256 哈希，请选择正确的代码。 +依赖的文件请参考： +* [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) + +## 答案 + +```c +#include "sha256.h" +#include + +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); + fclose(file); + return 0; +} + +``` + +## 选项 + +### 选项1 + +```c +#include "sha256.h" +#include + +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(file, buffer, 1, 1024); + 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); + fclose(file); + return 0; +} +``` + +### 选项2 + +```c +#include "sha256.h" +#include + +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, 2, 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); + fclose(file); + return 0; +} + +``` + +### 选项3 + +```c +#include "sha256.h" +#include + +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; +} +``` \ 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/sha256.c" "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/sha256.c" new file mode 100644 index 0000000..e614af1 --- /dev/null +++ "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/sha256.c" @@ -0,0 +1,186 @@ +/* + 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 "sha256.h" + +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); +} + +void sha256_easy_hash(const void *data, size_t size, uint8_t *hash) { + struct sha256_buff buff; + sha256_init(&buff); + sha256_update(&buff, data, size); + sha256_finalize(&buff); + sha256_read(&buff, hash); +} + +void sha256_easy_hash_hex(const void *data, size_t size, char *hex) { + uint8_t hash[32]; + sha256_easy_hash(data, size, hash); + bin_to_hex(hash, 32, hex); +} \ 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/sha256.h" "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/sha256.h" new file mode 100644 index 0000000..e11adca --- /dev/null +++ "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/sha256.h" @@ -0,0 +1,96 @@ +/* + 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. +*/ + +#ifndef SHA256_H +#define SHA256_H + +#ifdef __cplusplus +extern "C" { +#endif + +#include +#include +#include + +struct sha256_buff { + uint64_t data_size; + uint32_t h[8]; + uint8_t last_chunk[64]; + uint8_t chunk_size; +}; + +/* Initialization, must be called before any further use */ +void sha256_init(struct sha256_buff *buff); + +/* Process block of data of arbitary length, can be used on data streams (files, + * etc) */ +void sha256_update(struct sha256_buff *buff, const void *data, size_t size); + +/* Produces final hash values (digest) to be read + If the buffer is reused later, init must be called again */ +void sha256_finalize(struct sha256_buff *buff); + +/* Read digest into 32-byte binary array */ +void sha256_read(const struct sha256_buff *buff, uint8_t *hash); + +/* Read digest into 64-char string as hex (without null-byte) */ +void sha256_read_hex(const struct sha256_buff *buff, char *hex); + +/* Hashes single contiguous block of data and reads digest into 32-byte binary + * array */ +void sha256_easy_hash(const void *data, size_t size, uint8_t *hash); + +/* Hashes single contiguous block of data and reads digest into 64-char string + * (without null-byte) */ +void sha256_easy_hash_hex(const void *data, size_t size, char *hex); + +#ifdef __cplusplus +} + +#include + +class SHA256 { +private: + struct sha256_buff buff; + +public: + SHA256() { sha256_init(&buff); } + + void update(const void *data, std::size_t size) { + sha256_update(&buff, data, size); + } + + std::string hash() { + char hash[64]; + sha256_finalize(&buff); + sha256_read_hex(&buff, hash); + sha256_init(&buff); + return std::string(hash, 64); + } + + static std::string hashString(const std::string &str) { + char hash[64]; + sha256_easy_hash_hex(str.c_str(), str.length(), hash); + return std::string(hash, 64); + } +}; + +#endif + +#endif \ No newline at end of file -- GitLab