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I'm trying to set up a basic test of HMAC-SHA-256 hashing but I'm having problems with the engine setup. Ideally I would like to set up only the HMAC-SHA-algorithm but so far I haven't even gotten the general case where load all the algorithms to work. Currently I'm getting segfaults on the row where I try to set the default digests. Also, I'm regularly a Java guy, so don't hesitate to point out any mistakes in the code. #include <openssl/hmac.h> #include <openssl/evp.h> #include <stdio.h> #include <string.h> #include <stdlib.h> int main() { unsigned char* key = (unsigned char*) "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"; unsigned char* data = (unsigned char*) "4869205468657265"; unsigned char* expected = (unsigned char*) "b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7"; unsigned char* result; HMAC_CTX* ctx; ENGINE* e; ENGINE_load_builtin_engines(); ENGINE_register_all_complete(); ENGINE_set_default_digests(e); HMAC_CTX_init(ctx); HMAC_Init_ex(ctx, key, 40, EVP_sha256(), e); result = HMAC(NULL, NULL, 40, data, 16, NULL, NULL); HMAC_CTX_cleanup(ctx); ENGINE_finish(e); ENGINE_free(e); if (strcmp((char*) result, (char*) expected) == 0) { printf("Test ok\n"); } else { printf("Got %s instead of %s\n", result, expected); } } EDIT: The program has now evolved to the following, but I'm still segfaulting at HMAC_Init_ex : unsigned char* key = (unsigned char*) "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"; unsigned char* data = (unsigned char*) "4869205468657265"; unsigned char* expected = (unsigned char*) "b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7"; unsigned char* result; unsigned int result_len = 64; HMAC_CTX ctx; ENGINE* e; result = (unsigned char*) malloc(sizeof(char) * result_len); e = (ENGINE*) ENGINE_new(); ENGINE_load_builtin_engines(); ENGINE_register_all_complete(); ENGINE_set_

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