| 1 | /*
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| 2 | * Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/crypto.h>
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| 11 | #include "prov/digestcommon.h"
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| 12 | #include "prov/implementations.h"
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| 13 |
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| 14 | typedef struct {
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| 15 | unsigned char nothing;
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| 16 | } NULLMD_CTX;
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| 17 |
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| 18 | static int null_init(NULLMD_CTX *ctx)
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| 19 | {
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| 20 | return 1;
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| 21 | }
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| 22 |
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| 23 | static int null_update(NULLMD_CTX *ctx, const void *data, size_t datalen)
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| 24 | {
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| 25 | return 1;
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| 26 | }
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| 27 |
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| 28 | static int null_final(unsigned char *md, NULLMD_CTX *ctx)
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| 29 | {
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| 30 | return 1;
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| 31 | }
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| 32 |
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| 33 | /*
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| 34 | * We must override the PROV_FUNC_DIGEST_FINAL as dgstsize == 0
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| 35 | * and that would cause compilation warnings with the default implementation.
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| 36 | */
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| 37 | #undef PROV_FUNC_DIGEST_FINAL
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| 38 | #define PROV_FUNC_DIGEST_FINAL(name, dgstsize, fin) \
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| 39 | static OSSL_FUNC_digest_final_fn name##_internal_final; \
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| 40 | static int name##_internal_final(void *ctx, unsigned char *out, size_t *outl, \
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| 41 | size_t outsz) \
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| 42 | { \
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| 43 | if (ossl_prov_is_running() && fin(out, ctx)) { \
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| 44 | *outl = dgstsize; \
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| 45 | return 1; \
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| 46 | } \
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| 47 | return 0; \
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| 48 | }
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| 49 |
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| 50 | IMPLEMENT_digest_functions(nullmd, NULLMD_CTX,
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| 51 | 0, 0, 0,
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| 52 | null_init, null_update, null_final)
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