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