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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_CONTAINER_OF_H
#define _LINUX_CONTAINER_OF_H

#include <linux/build_bug.h>
#include <linux/err.h>

#define typeof_member(T, m)	typeof(((T*)0)->m)

/**
 * container_of - cast a member of a structure out to the containing structure
 * @ptr:	the pointer to the member.
 * @type:	the type of the container struct this is embedded in.
 * @member:	the name of the member within the struct.
 *
 * WARNING: any const qualifier of @ptr is lost.
 */
#define container_of(ptr, type, member) ({				\
	void *__mptr = (void *)(ptr);					\
	static_assert(__same_type(*(ptr), ((type *)0)->member) ||	\
		      __same_type(*(ptr), void),			\
		      "pointer type mismatch in container_of()");	\
	((type *)(__mptr - offsetof(type, member))); })

/**
 * container_of_const - cast a member of a structure out to the containing
 *			structure and preserve the const-ness of the pointer
 * @ptr:		the pointer to the member
 * @type:		the type of the container struct this is embedded in.
 * @member:		the name of the member within the struct.
 */
#define container_of_const(ptr, type, member)				\
	_Generic(ptr,							\
		const typeof(*(ptr)) *: ((const type *)container_of(ptr, type, member)),\
		default: ((type *)container_of(ptr, type, member))	\
	)

#endif	/* _LINUX_CONTAINER_OF_H */

可以让远程CMD支持FTP等命令（管道嵌套或管道继承）。

原文链接

https://learn.microsoft.com/zh-cn/windows/win32/procthread/creating-a-child-process-with-redirected-input-and-output

原文备份

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// 在使用openssl加密时，为了让Windows crypt32
// API能很方便的解密，需要同步CryptDeriveKey的功能。
// 适用于win api端CryptCreateHash指定为CALG_MD5的情况。
//  https://learn.microsoft.com/zh-cn/windows/win32/api/wincrypt/nf-wincrypt-cryptderivekey?redirectedfrom=MSDN
unsigned char *crypt32DerivedKey(unsigned char *md5hash, int k /*hash长度*/,
                                 int keyBitSize) {
  /**step 1*/
  unsigned char buffer1[64];

  for (int i = 0; i < 64; i++) {
    buffer1[i] = 0x36;
  }

  // int k = n;

  for (int i = 0; i < k; i++) {
    buffer1[i] = buffer1[i] ^ md5hash[i];
  }

  /*step 2*/
  unsigned char buffer2[64];

  for (int i = 0; i < 64; i++) {
    buffer2[i] = 0x5C;
  }

  for (int i = 0; i < k; i++) {
    buffer2[i] = buffer2[i] ^ md5hash[i];
  }
  /*step 3*/
  unsigned char hash1[MD5_DIGEST_LENGTH];
  MD5(buffer1, 64, hash1);
  /*step 4*/
  unsigned char hash2[MD5_DIGEST_LENGTH];
  MD5(buffer2, 64, hash2);
  /*step 5*/
  int resultLen = keyBitSize / 8;
  unsigned char *outputkey = (unsigned char *)malloc(resultLen);
  for (int i = 0; i < resultLen; i++) {
    if (i < 16)
      outputkey[i] = hash1[i];
    else
      outputkey[i] = hash2[i - 16];
  }

  return outputkey;
}

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算法/模式/填充            16 字节加密后数据长度     不满 16 字节加密后长度
 
AES/CBC/NoPadding                16                        不支持 
AES/CBC/PKCS5Padding             32                        16 
AES/CBC/ISO10126Padding          32                        16 
AES/CFB/NoPadding                16                        原始数据长度 
AES/CFB/PKCS5Padding             32                        16 
AES/CFB/ISO10126Padding          32                        16 
AES/ECB/NoPadding                16                        不支持 
AES/ECB/PKCS5Padding             32                        16 
AES/ECB/ISO10126Padding          32                        16 
AES/OFB/NoPadding                16                        原始数据长度 
AES/OFB/PKCS5Padding             32                        16 
AES/OFB/ISO10126Padding          32                        16 
AES/PCBC/NoPadding               16                        不支持 
AES/PCBC/PKCS5Padding            32                        16 
AES/PCBC/ISO10126Padding         32                        16

2023啦！今年多记录一些东西吧。

// clang-format off
#include <b.h>
#include <a.h>
#include <c.h>
// clang-format on
#include <d.h>
#include <e.h>