Problem in trying EVP Key Derivation example in openssl

Bhuvan Sharma erbsharma021 at gmail.com
Sat Sep 14 21:28:35 UTC 2019


Hey all,
I'm new to openssl community and I don't know much about it. I tried to use
openssl on my linux machine. I clone openssl git repo and executed these
commands as mentioned in the file "INSTALL": "./config", "make", "make
test", "make install". It went alright. Then I tried an "EVP KEY
Derivation" example from this link:
https://wiki.openssl.org/index.php?title=EVP_Key_Derivation&redirect=no#targetText=HKDF%20was%20designed%20by%20Krawczyk,from%20the%20OpenSSL%20man%20pages.
But it gives me some error for undeclared function.
~/openssl$ gcc -std=c99 test.c -o test.exe -l:libcrypto.a -pthread -ldl
test.c: In function ‘main’:
test.c:12:17: warning: implicit declaration of function
‘EVP_KDF_CTX_new_id’; did you mean ‘EVP_KDF_CTX_new’?
[-Wimplicit-function-declaration]
     if ((kctx = EVP_KDF_CTX_new_id(EVP_KDF_HKDF)) == NULL) {
                 ^~~~~~~~~~~~~~~~~~
                 EVP_KDF_CTX_new
test.c:12:36: error: ‘EVP_KDF_HKDF’ undeclared (first use in this
function); did you mean ‘EVP_PKEY_HKDF’?
     if ((kctx = EVP_KDF_CTX_new_id(EVP_KDF_HKDF)) == NULL) {
                                    ^~~~~~~~~~~~
                                    EVP_PKEY_HKDF
test.c:12:36: note: each undeclared identifier is reported only once for
each function it appears in
test.c:13:9: warning: implicit declaration of function ‘error’; did you
mean ‘perror’? [-Wimplicit-function-declaration]
         error("EVP_KDF_CTX_new_id");
         ^~~~~
         perror
test.c:15:9: warning: implicit declaration of function ‘EVP_KDF_ctrl’; did
you mean ‘EVP_KDF_size’? [-Wimplicit-function-declaration]
     if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_MD, EVP_sha256()) <= 0) {
         ^~~~~~~~~~~~
         EVP_KDF_size

Is there any problem with the installation or am I missing something else?
Your help is much appreciated.

Thanks & Regards,
Bhuvan Sharma
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