providers/implementations/macs/siphash_prov.c

   1 /*
   2  * Copyright 2018-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <string.h>
  11 #include <openssl/core_dispatch.h>
  12 #include <openssl/core_names.h>
  13 #include <openssl/params.h>
  14 #include <openssl/evp.h>
  15 #include <openssl/err.h>
  16
  17 #include "crypto/siphash.h"
  18 /*
  19  * TODO(3.0) when siphash has moved entirely to our providers, this
  20  * header should be moved to the provider include directory.  For the
  21  * moment, crypto/siphash/siphash_ameth.c has us stuck.
  22  */
  23 #include "../../../crypto/siphash/siphash_local.h"
  24
  25 #include "prov/providercommonerr.h"
  26 #include "prov/implementations.h"
  27 #include "prov/providercommon.h"
  28
  29 /*
  30  * Forward declaration of everything implemented here.  This is not strictly
  31  * necessary for the compiler, but provides an assurance that the signatures
  32  * of the functions in the dispatch table are correct.
  33  */
  34 static OSSL_FUNC_mac_newctx_fn siphash_new;
  35 static OSSL_FUNC_mac_dupctx_fn siphash_dup;
  36 static OSSL_FUNC_mac_freectx_fn siphash_free;
  37 static OSSL_FUNC_mac_gettable_ctx_params_fn siphash_gettable_ctx_params;
  38 static OSSL_FUNC_mac_get_ctx_params_fn siphash_get_ctx_params;
  39 static OSSL_FUNC_mac_settable_ctx_params_fn siphash_settable_params;
  40 static OSSL_FUNC_mac_set_ctx_params_fn siphash_set_params;
  41 static OSSL_FUNC_mac_size_fn siphash_size;
  42 static OSSL_FUNC_mac_init_fn siphash_init;
  43 static OSSL_FUNC_mac_update_fn siphash_update;
  44 static OSSL_FUNC_mac_final_fn siphash_final;
  45
  46 struct siphash_data_st {
  47     void *provctx;
  48     SIPHASH siphash;             /* Siphash data */
  49 };
  50
  51 static void *siphash_new(void *provctx)
  52 {
  53     struct siphash_data_st *ctx;
  54
  55     if (!ossl_prov_is_running())
  56         return NULL;
  57     ctx = OPENSSL_zalloc(sizeof(*ctx));
  58     if (ctx != NULL)
  59         ctx->provctx = provctx;
  60     return ctx;
  61 }
  62
  63 static void siphash_free(void *vmacctx)
  64 {
  65     OPENSSL_free(vmacctx);
  66 }
  67
  68 static void *siphash_dup(void *vsrc)
  69 {
  70     struct siphash_data_st *ssrc = vsrc;
  71     struct siphash_data_st *sdst;
  72
  73     if (!ossl_prov_is_running())
  74         return NULL;
  75     sdst = siphash_new(ssrc->provctx);
  76     if (sdst == NULL)
  77         return NULL;
  78
  79     sdst->siphash = ssrc->siphash;
  80     return sdst;
  81 }
  82
  83 static size_t siphash_size(void *vmacctx)
  84 {
  85     struct siphash_data_st *ctx = vmacctx;
  86
  87     return SipHash_hash_size(&ctx->siphash);
  88 }
  89
  90 static int siphash_init(void *vmacctx)
  91 {
  92     /* Not much to do here, actual initialization happens through controls */
  93     return ossl_prov_is_running();
  94 }
  95
  96 static int siphash_update(void *vmacctx, const unsigned char *data,
  97                        size_t datalen)
  98 {
  99     struct siphash_data_st *ctx = vmacctx;
 100
 101     if (datalen == 0)
 102         return 1;
 103
 104     SipHash_Update(&ctx->siphash, data, datalen);
 105     return 1;
 106 }
 107
 108 static int siphash_final(void *vmacctx, unsigned char *out, size_t *outl,
 109                          size_t outsize)
 110 {
 111     struct siphash_data_st *ctx = vmacctx;
 112     size_t hlen = siphash_size(ctx);
 113
 114     if (!ossl_prov_is_running() || outsize < hlen)
 115         return 0;
 116
 117     *outl = hlen;
 118     return SipHash_Final(&ctx->siphash, out, hlen);
 119 }
 120
 121 static const OSSL_PARAM known_gettable_ctx_params[] = {
 122     OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
 123     OSSL_PARAM_END
 124 };
 125 static const OSSL_PARAM *siphash_gettable_ctx_params(ossl_unused void *provctx)
 126 {
 127     return known_gettable_ctx_params;
 128 }
 129
 130 static int siphash_get_ctx_params(void *vmacctx, OSSL_PARAM params[])
 131 {
 132     OSSL_PARAM *p;
 133
 134     if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
 135         return OSSL_PARAM_set_size_t(p, siphash_size(vmacctx));
 136
 137     return 1;
 138 }
 139
 140 static const OSSL_PARAM known_settable_ctx_params[] = {
 141     OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
 142     OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
 143     OSSL_PARAM_END
 144 };
 145 static const OSSL_PARAM *siphash_settable_params(void *provctx)
 146 {
 147     return known_settable_ctx_params;
 148 }
 149
 150 static int siphash_set_params(void *vmacctx, const OSSL_PARAM *params)
 151 {
 152     struct siphash_data_st *ctx = vmacctx;
 153     const OSSL_PARAM *p = NULL;
 154
 155     if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_SIZE)) != NULL) {
 156         size_t size;
 157
 158         if (!OSSL_PARAM_get_size_t(p, &size)
 159             || !SipHash_set_hash_size(&ctx->siphash, size))
 160             return 0;
 161     }
 162     if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL)
 163         if (p->data_type != OSSL_PARAM_OCTET_STRING
 164             || p->data_size != SIPHASH_KEY_SIZE
 165             || !SipHash_Init(&ctx->siphash, p->data, 0, 0))
 166             return 0;
 167     return 1;
 168 }
 169
 170 const OSSL_DISPATCH siphash_functions[] = {
 171     { OSSL_FUNC_MAC_NEWCTX, (void (*)(void))siphash_new },
 172     { OSSL_FUNC_MAC_DUPCTX, (void (*)(void))siphash_dup },
 173     { OSSL_FUNC_MAC_FREECTX, (void (*)(void))siphash_free },
 174     { OSSL_FUNC_MAC_INIT, (void (*)(void))siphash_init },
 175     { OSSL_FUNC_MAC_UPDATE, (void (*)(void))siphash_update },
 176     { OSSL_FUNC_MAC_FINAL, (void (*)(void))siphash_final },
 177     { OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS,
 178       (void (*)(void))siphash_gettable_ctx_params },
 179     { OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))siphash_get_ctx_params },
 180     { OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
 181       (void (*)(void))siphash_settable_params },
 182     { OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))siphash_set_params },
 183     { 0, NULL }
 184 };