How to assign a hexadecimal value to an unsigned char variable in a C program [closed]

by

That’s a string of 32 characters, being hexadecimal digits. That makes 16 bytes, or 128 bits.

m0skit0 told you how to store it in a string. If you actually want to store that in an integer, you’d need something like unsigned long long intvar = strtoull( stringvar, NULL, 16 ) – provided “long long” on your machine can stomach 128 bits.

But what you want is something completely different, which became clear only after you linked to that other question. (It’s really bad to take something out of context like that, especially if you are confused about what you’re actually doing.)

If you take a look at the API documentation, you will see that the parameter you are looking at is a pointer to DES_cblock. That’s not a string, and not an integer. Have a look at seed and ivsetup in that other question, how they are initialized, and think for a minute.

More Related Contents:

  1. How do I store a 16 byte binary value that can be represented as a 32 hexadecimal characters in an unsigned char* variable in C
  2. how to convert .c file to .hex file and load it on AVR microcontroller?
  3. Printing hexadecimal characters in C
  4. Why are hexadecimal numbers prefixed with 0x?
  5. How do you convert a byte array to a hexadecimal string in C?
  6. What do numbers using 0x notation mean?
  7. Unsigned hexadecimal constant in C?
  8. How to turn a hex string into an unsigned char array?
  9. Comparing unsigned char and EOF
  10. printf with “%d” of numbers starting with 0 (ex “0102”) giving unexpected answer (ex ‘”66″)
  11. hexadecimal floating constant in C
  12. Hex to char array in C
  13. Convert a hexadecimal string to an integer efficiently in C?
  14. How to convert a hexadecimal string to a binary string in C
  15. printf() formatting for hexadecimal
  16. Bit manipulation, return 0 if x != 0, or nonzero otherwise
  17. Cascaded and nested if statements in C programming language
  18. Inserting linked list at the end [closed]
  19. Error handling in C code
  20. Should I explicitly cast malloc()’s return value? [duplicate]
  21. Reflection support in C
  22. What is the result of NULL + int?
  23. gdb – debugging with pipe
  24. Yet Another MinGW “gcc: error: CreateProcess: No such file or directory”
  25. Why does printf print random value with float and integer format specifier
  26. executing default signal handler
  27. STM32 how to get last reset status
  28. pow() cast to integer, unexpected result
  29. Iterating over same type struct members in C
  30. What’s the difference between “C system calls” and “C library routines”?

Leave a Comment