providers/implementations/macs/siphash_prov.c

   1 /*
   2  * Copyright 2018 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
  28 /*
  29  * Forward declaration of everything implemented here.  This is not strictly
  30  * necessary for the compiler, but provides an assurance that the signatures
  31  * of the functions in the dispatch table are correct.
  32  */
  33 static OSSL_FUNC_mac_newctx_fn siphash_new;
  34 static OSSL_FUNC_mac_dupctx_fn siphash_dup;
  35 static OSSL_FUNC_mac_freectx_fn siphash_free;
  36 static OSSL_FUNC_mac_gettable_ctx_params_fn siphash_gettable_ctx_params;
  37 static OSSL_FUNC_mac_get_ctx_params_fn siphash_get_ctx_params;
  38 static OSSL_FUNC_mac_settable_ctx_params_fn siphash_settable_params;
  39 static OSSL_FUNC_mac_set_ctx_params_fn siphash_set_params;
  40 static OSSL_FUNC_mac_size_fn siphash_size;
  41 static OSSL_FUNC_mac_init_fn siphash_init;
  42 static OSSL_FUNC_mac_update_fn siphash_update;
  43 static OSSL_FUNC_mac_final_fn siphash_final;
  44
  45 struct siphash_data_st {
  46     void *provctx;
  47     SIPHASH siphash;             /* Siphash data */
  48 };
  49
  50 static void *siphash_new(void *provctx)
  51 {
  52     struct siphash_data_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
  53
  54     if (ctx != NULL)
  55         ctx->provctx = provctx;
  56     return ctx;
  57 }
  58
  59 static void siphash_free(void *vmacctx)
  60 {
  61     OPENSSL_free(vmacctx);
  62 }
  63
  64 static void *siphash_dup(void *vsrc)
  65 {
  66     struct siphash_data_st *ssrc = vsrc;
  67     struct siphash_data_st *sdst = siphash_new(ssrc->provctx);
  68
  69     if (sdst == NULL)
  70         return NULL;
  71
  72     sdst->siphash = ssrc->siphash;
  73     return sdst;
  74 }
  75
  76 static size_t siphash_size(void *vmacctx)
  77 {
  78     struct siphash_data_st *ctx = vmacctx;
  79
  80     return SipHash_hash_size(&ctx->siphash);
  81 }
  82
  83 static int siphash_init(void *vmacctx)
  84 {
  85     /* Not much to do here, actual initialization happens through controls */
  86     return 1;
  87 }
  88
  89 static int siphash_update(void *vmacctx, const unsigned char *data,
  90                        size_t datalen)
  91 {
  92     struct siphash_data_st *ctx = vmacctx;
  93
  94     SipHash_Update(&ctx->siphash, data, datalen);
  95     return 1;
  96 }
  97
  98 static int siphash_final(void *vmacctx, unsigned char *out, size_t *outl,
  99                          size_t outsize)
 100 {
 101     struct siphash_data_st *ctx = vmacctx;
 102     size_t hlen = siphash_size(ctx);
 103
 104     if (outsize < hlen)
 105         return 0;
 106
 107     *outl = hlen;
 108     return SipHash_Final(&ctx->siphash, out, hlen);
 109 }
 110
 111 static const OSSL_PARAM known_gettable_ctx_params[] = {
 112     OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
 113     OSSL_PARAM_END
 114 };
 115 static const OSSL_PARAM *siphash_gettable_ctx_params(void)
 116 {
 117     return known_gettable_ctx_params;
 118 }
 119
 120 static int siphash_get_ctx_params(void *vmacctx, OSSL_PARAM params[])
 121 {
 122     OSSL_PARAM *p;
 123
 124     if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
 125         return OSSL_PARAM_set_size_t(p, siphash_size(vmacctx));
 126
 127     return 1;
 128 }
 129
 130 static const OSSL_PARAM known_settable_ctx_params[] = {
 131     OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
 132     OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
 133     OSSL_PARAM_END
 134 };
 135 static const OSSL_PARAM *siphash_settable_params(void)
 136 {
 137     return known_settable_ctx_params;
 138 }
 139
 140 static int siphash_set_params(void *vmacctx, const OSSL_PARAM *params)
 141 {
 142     struct siphash_data_st *ctx = vmacctx;
 143     const OSSL_PARAM *p = NULL;
 144
 145     if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_SIZE)) != NULL) {
 146         size_t size;
 147
 148         if (!OSSL_PARAM_get_size_t(p, &size)
 149             || !SipHash_set_hash_size(&ctx->siphash, size))
 150             return 0;
 151     }
 152     if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL)
 153         if (p->data_type != OSSL_PARAM_OCTET_STRING
 154             || p->data_size != SIPHASH_KEY_SIZE
 155             || !SipHash_Init(&ctx->siphash, p->data, 0, 0))
 156             return 0;
 157     return 1;
 158 }
 159
 160 const OSSL_DISPATCH siphash_functions[] = {
 161     { OSSL_FUNC_MAC_NEWCTX, (void (*)(void))siphash_new },
 162     { OSSL_FUNC_MAC_DUPCTX, (void (*)(void))siphash_dup },
 163     { OSSL_FUNC_MAC_FREECTX, (void (*)(void))siphash_free },
 164     { OSSL_FUNC_MAC_INIT, (void (*)(void))siphash_init },
 165     { OSSL_FUNC_MAC_UPDATE, (void (*)(void))siphash_update },
 166     { OSSL_FUNC_MAC_FINAL, (void (*)(void))siphash_final },
 167     { OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS,
 168       (void (*)(void))siphash_gettable_ctx_params },
 169     { OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))siphash_get_ctx_params },
 170     { OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
 171       (void (*)(void))siphash_settable_params },
 172     { OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))siphash_set_params },
 173     { 0, NULL }
 174 };