bool s_resolve_md_lc()

in source/unix/openssl_platform_init.c [349:387]

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

bool s_resolve_md_lc(void *module) {
#if defined(OPENSSL_IS_AWSLC)
    evp_md_ctx_new md_new_fn = EVP_MD_CTX_new;
    evp_md_ctx_new md_create_fn = EVP_MD_CTX_new;
    evp_md_ctx_free md_free_fn = EVP_MD_CTX_free;
    evp_md_ctx_free md_destroy_fn = EVP_MD_CTX_destroy;
    evp_md_ctx_digest_init_ex md_init_ex_fn = EVP_DigestInit_ex;
    evp_md_ctx_digest_update md_update_fn = EVP_DigestUpdate;
    evp_md_ctx_digest_final_ex md_final_ex_fn = EVP_DigestFinal_ex;

    bool has_awslc_symbols =
        md_new_fn && md_create_fn && md_free_fn && md_destroy_fn && md_init_ex_fn && md_update_fn && md_final_ex_fn;

    if (has_awslc_symbols) {
        AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found static aws-lc libcrypto 1.1.1 EVP_MD symbols");
    } else {
        *(void **)(&md_new_fn) = dlsym(module, "EVP_MD_CTX_new");
        *(void **)(&md_free_fn) = dlsym(module, "EVP_MD_CTX_free");
        *(void **)(&md_init_ex_fn) = dlsym(module, "EVP_DigestInit_ex");
        *(void **)(&md_update_fn) = dlsym(module, "EVP_DigestUpdate");
        *(void **)(&md_final_ex_fn) = dlsym(module, "EVP_DigestFinal_ex");
        if (md_new_fn) {
            AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found dynamic aws-lc libcrypto 1.1.1 EVP_MD symbols");
        }
    }

    if (md_new_fn) {
        /* Add the found symbols to the vtable */
        evp_md_ctx_table.new_fn = md_new_fn;
        evp_md_ctx_table.free_fn = md_free_fn;
        evp_md_ctx_table.init_ex_fn = md_init_ex_fn;
        evp_md_ctx_table.update_fn = md_update_fn;
        evp_md_ctx_table.final_ex_fn = md_final_ex_fn;
        g_aws_openssl_evp_md_ctx_table = &evp_md_ctx_table;
        return true;
    }
#endif
    return false;
}