Problem in trying EVP Key Derivation example in openssl

[Dr Paul Dale]

The example is wrong.

The KDF API changed recently to better match the way the rest of the project is moving.
I’ll update the example.


Pauli
-- 
Dr Paul Dale | Distinguished Architect | Cryptographic Foundations 
Phone +61 7 3031 7217
Oracle Australia




> On 15 Sep 2019, at 7:28 am, Bhuvan Sharma <erbsharma021 at gmail.com> wrote:
> 
> 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 <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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