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 <erbsharma...@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
