bool s_resolve_hmac_102()

in source/unix/openssl_platform_init.c [103:141]

• 35 lines of code
• 8 McCabe index (conditional complexity)

bool s_resolve_hmac_102(void *module) {
#if !defined(OPENSSL_IS_AWSLC)
    hmac_ctx_init init_fn = (hmac_ctx_init)HMAC_CTX_init;
    hmac_ctx_clean_up clean_up_fn = (hmac_ctx_clean_up)HMAC_CTX_cleanup;
    hmac_ctx_update update_fn = (hmac_ctx_update)HMAC_Update;
    hmac_ctx_final final_fn = (hmac_ctx_final)HMAC_Final;
    hmac_ctx_init_ex init_ex_fn = (hmac_ctx_init_ex)HMAC_Init_ex;

    /* were symbols bound by static linking? */
    bool has_102_symbols = init_fn && clean_up_fn && update_fn && final_fn && init_ex_fn;
    if (has_102_symbols) {
        AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found static libcrypto 1.0.2 HMAC symbols");
    } else {
        /* If symbols aren't already found, try to find the requested version */
        *(void **)(&init_fn) = dlsym(module, "HMAC_CTX_init");
        *(void **)(&clean_up_fn) = dlsym(module, "HMAC_CTX_cleanup");
        *(void **)(&update_fn) = dlsym(module, "HMAC_Update");
        *(void **)(&final_fn) = dlsym(module, "HMAC_Final");
        *(void **)(&init_ex_fn) = dlsym(module, "HMAC_Init_ex");
        if (init_fn) {
            AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found dynamic libcrypto 1.0.2 HMAC symbols");
        }
    }

    if (init_fn) {
        hmac_ctx_table.new_fn = (hmac_ctx_new)s_hmac_ctx_new;
        hmac_ctx_table.reset_fn = (hmac_ctx_reset)s_hmac_ctx_reset;
        hmac_ctx_table.free_fn = s_hmac_ctx_free;
        hmac_ctx_table.init_fn = init_fn;
        hmac_ctx_table.clean_up_fn = clean_up_fn;
        hmac_ctx_table.update_fn = update_fn;
        hmac_ctx_table.final_fn = final_fn;
        hmac_ctx_table.init_ex_fn = init_ex_fn;
        g_aws_openssl_hmac_ctx_table = &hmac_ctx_table;
        return true;
    }
#endif
    return false;
}