Viewing file:  siphash_prov.c (7.2 KB) -rw-r--r--
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/*
* Copyright 2018-2022 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 <string.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/params.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/proverr.h>
#include "crypto/siphash.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"
/*
* Forward declaration of everything implemented here. This is not strictly
* necessary for the compiler, but provides an assurance that the signatures
* of the functions in the dispatch table are correct.
*/
static OSSL_FUNC_mac_newctx_fn siphash_new;
static OSSL_FUNC_mac_dupctx_fn siphash_dup;
static OSSL_FUNC_mac_freectx_fn siphash_free;
static OSSL_FUNC_mac_gettable_ctx_params_fn siphash_gettable_ctx_params;
static OSSL_FUNC_mac_get_ctx_params_fn siphash_get_ctx_params;
static OSSL_FUNC_mac_settable_ctx_params_fn siphash_settable_ctx_params;
static OSSL_FUNC_mac_set_ctx_params_fn siphash_set_params;
static OSSL_FUNC_mac_init_fn siphash_init;
static OSSL_FUNC_mac_update_fn siphash_update;
static OSSL_FUNC_mac_final_fn siphash_final;
struct siphash_data_st {
void *provctx;
SIPHASH siphash; /* Siphash data */
SIPHASH sipcopy; /* Siphash data copy for reinitialization */
unsigned int crounds, drounds;
};
static unsigned int crounds(struct siphash_data_st *ctx)
{
return ctx->crounds != 0 ? ctx->crounds : SIPHASH_C_ROUNDS;
}
static unsigned int drounds(struct siphash_data_st *ctx)
{
return ctx->drounds != 0 ? ctx->drounds : SIPHASH_D_ROUNDS;
}
static void *siphash_new(void *provctx)
{
struct siphash_data_st *ctx;
if (!ossl_prov_is_running())
return NULL;
ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL)
ctx->provctx = provctx;
return ctx;
}
static void siphash_free(void *vmacctx)
{
OPENSSL_free(vmacctx);
}
static void *siphash_dup(void *vsrc)
{
struct siphash_data_st *ssrc = vsrc;
struct siphash_data_st *sdst;
if (!ossl_prov_is_running())
return NULL;
sdst = OPENSSL_malloc(sizeof(*sdst));
if (sdst == NULL)
return NULL;
*sdst = *ssrc;
return sdst;
}
static size_t siphash_size(void *vmacctx)
{
struct siphash_data_st *ctx = vmacctx;
return SipHash_hash_size(&ctx->siphash);
}
static int siphash_setkey(struct siphash_data_st *ctx,
const unsigned char *key, size_t keylen)
{
int ret;
if (keylen != SIPHASH_KEY_SIZE)
return 0;
ret = SipHash_Init(&ctx->siphash, key, crounds(ctx), drounds(ctx));
if (ret)
ctx->sipcopy = ctx->siphash;
return ret;
}
static int siphash_init(void *vmacctx, const unsigned char *key, size_t keylen,
const OSSL_PARAM params[])
{
struct siphash_data_st *ctx = vmacctx;
if (!ossl_prov_is_running() || !siphash_set_params(ctx, params))
return 0;
/*
* Without a key, there is not much to do here,
* The actual initialization happens through controls.
*/
if (key == NULL) {
ctx->siphash = ctx->sipcopy;
return 1;
}
return siphash_setkey(ctx, key, keylen);
}
static int siphash_update(void *vmacctx, const unsigned char *data,
size_t datalen)
{
struct siphash_data_st *ctx = vmacctx;
if (datalen == 0)
return 1;
SipHash_Update(&ctx->siphash, data, datalen);
return 1;
}
static int siphash_final(void *vmacctx, unsigned char *out, size_t *outl,
size_t outsize)
{
struct siphash_data_st *ctx = vmacctx;
size_t hlen = siphash_size(ctx);
if (!ossl_prov_is_running() || outsize < hlen)
return 0;
*outl = hlen;
return SipHash_Final(&ctx->siphash, out, hlen);
}
static const OSSL_PARAM *siphash_gettable_ctx_params(ossl_unused void *ctx,
ossl_unused void *provctx)
{
static const OSSL_PARAM known_gettable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
OSSL_PARAM_uint(OSSL_MAC_PARAM_C_ROUNDS, NULL),
OSSL_PARAM_uint(OSSL_MAC_PARAM_D_ROUNDS, NULL),
OSSL_PARAM_END
};
return known_gettable_ctx_params;
}
static int siphash_get_ctx_params(void *vmacctx, OSSL_PARAM params[])
{
struct siphash_data_st *ctx = vmacctx;
OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL
&& !OSSL_PARAM_set_size_t(p, siphash_size(vmacctx)))
return 0;
if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_C_ROUNDS)) != NULL
&& !OSSL_PARAM_set_uint(p, crounds(ctx)))
return 0;
if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_D_ROUNDS)) != NULL
&& !OSSL_PARAM_set_uint(p, drounds(ctx)))
return 0;
return 1;
}
static const OSSL_PARAM *siphash_settable_ctx_params(ossl_unused void *ctx,
void *provctx)
{
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
OSSL_PARAM_uint(OSSL_MAC_PARAM_C_ROUNDS, NULL),
OSSL_PARAM_uint(OSSL_MAC_PARAM_D_ROUNDS, NULL),
OSSL_PARAM_END
};
return known_settable_ctx_params;
}
static int siphash_set_params(void *vmacctx, const OSSL_PARAM *params)
{
struct siphash_data_st *ctx = vmacctx;
const OSSL_PARAM *p = NULL;
size_t size;
if (params == NULL)
return 1;
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_SIZE)) != NULL) {
if (!OSSL_PARAM_get_size_t(p, &size)
|| !SipHash_set_hash_size(&ctx->siphash, size)
|| !SipHash_set_hash_size(&ctx->sipcopy, size))
return 0;
}
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_C_ROUNDS)) != NULL
&& !OSSL_PARAM_get_uint(p, &ctx->crounds))
return 0;
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_D_ROUNDS)) != NULL
&& !OSSL_PARAM_get_uint(p, &ctx->drounds))
return 0;
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL)
if (p->data_type != OSSL_PARAM_OCTET_STRING
|| !siphash_setkey(ctx, p->data, p->data_size))
return 0;
return 1;
}
const OSSL_DISPATCH ossl_siphash_functions[] = {
{ OSSL_FUNC_MAC_NEWCTX, (void (*)(void))siphash_new },
{ OSSL_FUNC_MAC_DUPCTX, (void (*)(void))siphash_dup },
{ OSSL_FUNC_MAC_FREECTX, (void (*)(void))siphash_free },
{ OSSL_FUNC_MAC_INIT, (void (*)(void))siphash_init },
{ OSSL_FUNC_MAC_UPDATE, (void (*)(void))siphash_update },
{ OSSL_FUNC_MAC_FINAL, (void (*)(void))siphash_final },
{ OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS,
(void (*)(void))siphash_gettable_ctx_params },
{ OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))siphash_get_ctx_params },
{ OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
(void (*)(void))siphash_settable_ctx_params },
{ OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))siphash_set_params },
{ 0, NULL }
};
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