| /* |
| * Copyright 2021 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <openssl/crypto.h> |
| #include "prov/digestcommon.h" |
| #include "prov/implementations.h" |
| |
| typedef struct { |
| unsigned char nothing; |
| } NULLMD_CTX; |
| |
| static int null_init(NULLMD_CTX *ctx) |
| { |
| return 1; |
| } |
| |
| static int null_update(NULLMD_CTX *ctx, const void *data, size_t datalen) |
| { |
| return 1; |
| } |
| |
| static int null_final(unsigned char *md, NULLMD_CTX *ctx) |
| { |
| return 1; |
| } |
| |
| /* |
| * We must override the PROV_FUNC_DIGEST_FINAL as dgstsize == 0 |
| * and that would cause compilation warnings with the default implementation. |
| */ |
| #undef PROV_FUNC_DIGEST_FINAL |
| #define PROV_FUNC_DIGEST_FINAL(name, dgstsize, fin) \ |
| static OSSL_FUNC_digest_final_fn name##_internal_final; \ |
| static int name##_internal_final(void *ctx, unsigned char *out, size_t *outl, \ |
| size_t outsz) \ |
| { \ |
| if (ossl_prov_is_running() && fin(out, ctx)) { \ |
| *outl = dgstsize; \ |
| return 1; \ |
| } \ |
| return 0; \ |
| } |
| |
| IMPLEMENT_digest_functions(nullmd, NULLMD_CTX, |
| 0, 0, 0, |
| null_init, null_update, null_final) |