2 * Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/crypto.h>
11 #include "prov/digestcommon.h"
12 #include "prov/implementations.h"
15 unsigned char nothing;
18 static int null_init(NULLMD_CTX *ctx)
23 static int null_update(NULLMD_CTX *ctx, const void *data, size_t datalen)
28 static int null_final(unsigned char *md, NULLMD_CTX *ctx)
34 * We must override the PROV_FUNC_DIGEST_FINAL as dgstsize == 0
35 * and that would cause compilation warnings with the default implementation.
37 #undef PROV_FUNC_DIGEST_FINAL
38 #define PROV_FUNC_DIGEST_FINAL(name, dgstsize, fin) \
39 static OSSL_FUNC_digest_final_fn name##_internal_final; \
40 static int name##_internal_final(void *ctx, unsigned char *out, size_t *outl, \
43 if (ossl_prov_is_running() && fin(out, ctx)) { \
50 IMPLEMENT_digest_functions(nullmd, NULLMD_CTX,
52 null_init, null_update, null_final)