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/*
* 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)
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