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