If you build openssl1.1.1s using VS and NASM, you will find the following files are produced and mixed with the source files(suppose the openssl source code is in C:/opensslsrc/, the […]
I have little knowledge about ipv6 address. All I know is that it is longer than ipv4 address thus can be assigned to more hosts in the world. ipv6 addresses […]
The idea behind dkim is simple. You add a “DKIM-Signature:” in your email message. The stmp server receiving the email checks the header, pulls the dns record of the domain, […]
sha256 is an algorithm to map a string of any length to a 256bit string(so called hash). The input of the algorithm is a string of any length but the […]
Open the file with a text editor such as notepad++, the occurrence of “PE L” in the first several lines indicates it is 32 bit, while “PE d†” indicates 64 […]
On windows, when you press the print-screen key, the screenshot is saved into system clipboard in 3 formats:CF_BITMAP, CF_DIB, and CF_DIBV5. The FORMATETC structure for these formats are: {2,1,-1,0,16}, {8,1,-1,0,5}, […]
When compiling, gcc may output many error messages which are dazzling. Although you can locate the error in the source code in the end, you may never notice the details […]
I have a big misunderstanding about make. I thought if I run “make” or “make -f Makefile”, make will check the first target in the makefile and possibly update targets […]
If you ever build a large project, you may notice the entering/leaving directory messages in the output of make command, for example: mingw32-make[2]: Entering directory ‘C:/myproject’ … mingw32-make[2]: Leaving directory […]
How to build a shared library using gcc/g++? Building a shared library with gcc is easy but it takes 2 steps: gcc -c -fpic mytools.c gcc -shared -o libmytools.so mytools.o […]