c - Encoding a string in HMAC SHA256 -


how can encode string using hmac sha256 algorithm? went through openssl library didn't find valuable. suggestions?

hmac , sha256 separate components in openssl, you'll need glue them yourself. (note uses shorthand methods doing in 1 shot monolithic buffers; incremental processing more complex.)

#include <openssl/evp.h> #include <openssl/hmac.h>  unsigned char* hmac_sha256(const void *key, int keylen,                            const unsigned char *data, int datalen,                            unsigned char *result, unsigned int* resultlen) {     return hmac(evp_sha256(), key, keylen, data, datalen, result, resultlen); }

even if input string, result arbitrary byte array; if needs string you'll have apply other transformation hexadecimal expansion, base64 or whatever suits application.


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