How to convert each character of string to hex string in STM32F4 Discovery Board?

[SVerm.3]

I am using STM32CUBEIDE and want to convert each character of string to Hex string in STM32F4 Discovery Board, as I want to mask my string and process masked data. Please help me asap.

[MM..1]

sprintf %x

[SVerm.3]

but I want to store in variable not to print...

[MM..1]

Description

The C library function int sprintf(char *str, const char *format, ...) sends formatted output to a string pointed to, by str.

Declaration

Following is the declaration for sprintf() function.

int sprintf(char *str, const char *format, ...)

Parameters

• str − This is the pointer to an array of char elements where the resulting C string is stored

[Tesla DeLorean]

You're not explaining this very well, and the problem sounds like a C 101 level task.

Mask? As in hide/obfuscate?

[SVerm.3]

yes and string should be masked i.e for websocket

[SVerm.3]

Please provide me the answer like I just need to convert the Json string message to Hex code and after that, I need to mask as well. for Websocket Client application (RFC6455).

[MM..1]

How do you convert a byte array to a hexadecimal string in C? - Stack Overflow

[Piranha · Accepted solution]

Most likely the author doesn't need any HEX conversion at all. It was already explained to him that HEX is just a typical text representation of binary data:

https://community.st.com/s/question/0D53W00000e2PvaSAE/how-to-convert-hex-to-float-midlittle-endian-cdab-in-stm32cubeide

The "masking", which he is incapable of even explaining, seems to be this one:

https://datatracker.ietf.org/doc/html/rfc6455#section-5.3

A trivial algorithm with MOD and XOR operations. An ideal minor task for an absolute beginners like the author. One must learn the basics before making complex systems.

[SVerm.3]

thanks Sir, means a lot...