providers/implementations/macs/blake2_mac_impl.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 <openssl/core_dispatch.h>
  11 #include <openssl/core_names.h>
  12 #include <openssl/params.h>
  13
  14 #include "prov/blake2.h"
  15 #include "internal/cryptlib.h"
  16 #include "prov/providercommonerr.h"
  17 #include "prov/implementations.h"
  18
  19 /*
  20  * Forward declaration of everything implemented here.  This is not strictly
  21  * necessary for the compiler, but provides an assurance that the signatures
  22  * of the functions in the dispatch table are correct.
  23  */
  24 static OSSL_FUNC_mac_newctx_fn blake2_mac_new;
  25 static OSSL_FUNC_mac_dupctx_fn blake2_mac_dup;
  26 static OSSL_FUNC_mac_freectx_fn blake2_mac_free;
  27 static OSSL_FUNC_mac_gettable_ctx_params_fn blake2_gettable_ctx_params;
  28 static OSSL_FUNC_mac_get_ctx_params_fn blake2_get_ctx_params;
  29 static OSSL_FUNC_mac_settable_ctx_params_fn blake2_mac_settable_ctx_params;
  30 static OSSL_FUNC_mac_set_ctx_params_fn blake2_mac_set_ctx_params;
  31 static OSSL_FUNC_mac_init_fn blake2_mac_init;
  32 static OSSL_FUNC_mac_update_fn blake2_mac_update;
  33 static OSSL_FUNC_mac_final_fn blake2_mac_final;
  34
  35 struct blake2_mac_data_st {
  36     BLAKE2_CTX ctx;
  37     BLAKE2_PARAM params;
  38     unsigned char key[BLAKE2_KEYBYTES];
  39 };
  40
  41 static size_t blake2_mac_size(void *vmacctx);
  42
  43 static void *blake2_mac_new(void *unused_provctx)
  44 {
  45     struct blake2_mac_data_st *macctx = OPENSSL_zalloc(sizeof(*macctx));
  46
  47     if (macctx != NULL) {
  48         BLAKE2_PARAM_INIT(&macctx->params);
  49         /* ctx initialization is deferred to BLAKE2b_Init() */
  50     }
  51     return macctx;
  52 }
  53
  54 static void *blake2_mac_dup(void *vsrc)
  55 {
  56     struct blake2_mac_data_st *dst;
  57     struct blake2_mac_data_st *src = vsrc;
  58
  59     dst = OPENSSL_zalloc(sizeof(*dst));
  60     if (dst == NULL)
  61         return NULL;
  62
  63     *dst = *src;
  64     return dst;
  65 }
  66
  67 static void blake2_mac_free(void *vmacctx)
  68 {
  69     struct blake2_mac_data_st *macctx = vmacctx;
  70
  71     if (macctx != NULL) {
  72         OPENSSL_cleanse(macctx->key, sizeof(macctx->key));
  73         OPENSSL_free(macctx);
  74     }
  75 }
  76
  77 static int blake2_mac_init(void *vmacctx)
  78 {
  79     struct blake2_mac_data_st *macctx = vmacctx;
  80
  81     /* Check key has been set */
  82     if (macctx->params.key_length == 0) {
  83         ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
  84         return 0;
  85     }
  86
  87     return BLAKE2_INIT_KEY(&macctx->ctx, &macctx->params, macctx->key);
  88 }
  89
  90 static int blake2_mac_update(void *vmacctx,
  91                              const unsigned char *data, size_t datalen)
  92 {
  93     struct blake2_mac_data_st *macctx = vmacctx;
  94
  95     return BLAKE2_UPDATE(&macctx->ctx, data, datalen);
  96 }
  97
  98 static int blake2_mac_final(void *vmacctx,
  99                             unsigned char *out, size_t *outl,
 100                             size_t outsize)
 101 {
 102     struct blake2_mac_data_st *macctx = vmacctx;
 103
 104     return BLAKE2_FINAL(out, &macctx->ctx);
 105 }
 106
 107 static const OSSL_PARAM known_gettable_ctx_params[] = {
 108     OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
 109     OSSL_PARAM_END
 110 };
 111 static const OSSL_PARAM *blake2_gettable_ctx_params(void)
 112 {
 113     return known_gettable_ctx_params;
 114 }
 115
 116 static int blake2_get_ctx_params(void *vmacctx, OSSL_PARAM params[])
 117 {
 118     OSSL_PARAM *p;
 119
 120     if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
 121         return OSSL_PARAM_set_size_t(p, blake2_mac_size(vmacctx));
 122
 123     return 1;
 124 }
 125
 126 static const OSSL_PARAM known_settable_ctx_params[] = {
 127     OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
 128     OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
 129     OSSL_PARAM_octet_string(OSSL_MAC_PARAM_CUSTOM, NULL, 0),
 130     OSSL_PARAM_octet_string(OSSL_MAC_PARAM_SALT, NULL, 0),
 131     OSSL_PARAM_END
 132 };
 133 static const OSSL_PARAM *blake2_mac_settable_ctx_params()
 134 {
 135     return known_settable_ctx_params;
 136 }
 137
 138 /*
 139  * ALL parameters should be set before init().
 140  */
 141 static int blake2_mac_set_ctx_params(void *vmacctx, const OSSL_PARAM params[])
 142 {
 143     struct blake2_mac_data_st *macctx = vmacctx;
 144     const OSSL_PARAM *p;
 145
 146     if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_SIZE)) != NULL) {
 147         size_t size;
 148
 149         if (!OSSL_PARAM_get_size_t(p, &size)
 150             || size < 1
 151             || size > BLAKE2_OUTBYTES) {
 152             ERR_raise(ERR_LIB_PROV, PROV_R_NOT_XOF_OR_INVALID_LENGTH);
 153             return 0;
 154         }
 155         BLAKE2_PARAM_SET_DIGEST_LENGTH(&macctx->params, (uint8_t)size);
 156     }
 157
 158     if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL) {
 159         size_t len;
 160         void *key_p = macctx->key;
 161
 162         if (!OSSL_PARAM_get_octet_string(p, &key_p, BLAKE2_KEYBYTES, &len)) {
 163             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
 164             return 0;
 165         }
 166         /* Pad with zeroes at the end */
 167         memset(macctx->key + len, 0, BLAKE2_KEYBYTES - len);
 168
 169         BLAKE2_PARAM_SET_KEY_LENGTH(&macctx->params, (uint8_t)len);
 170     }
 171
 172     if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_CUSTOM))
 173         != NULL) {
 174         /*
 175          * The OSSL_PARAM API doesn't provide direct pointer use, so we
 176          * must handle the OSSL_PARAM structure ourselves here
 177          */
 178         if (p->data_size > BLAKE2_PERSONALBYTES) {
 179             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_CUSTOM_LENGTH);
 180             return 0;
 181         }
 182         BLAKE2_PARAM_SET_PERSONAL(&macctx->params, p->data, p->data_size);
 183     }
 184
 185     if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_SALT)) != NULL) {
 186         /*
 187          * The OSSL_PARAM API doesn't provide direct pointer use, so we
 188          * must handle the OSSL_PARAM structure ourselves here as well
 189          */
 190         if (p->data_size > BLAKE2_SALTBYTES) {
 191             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
 192             return 0;
 193         }
 194         BLAKE2_PARAM_SET_SALT(&macctx->params, p->data, p->data_size);
 195     }
 196     return 1;
 197 }
 198
 199 static size_t blake2_mac_size(void *vmacctx)
 200 {
 201     struct blake2_mac_data_st *macctx = vmacctx;
 202
 203     return macctx->params.digest_length;
 204 }
 205
 206 const OSSL_DISPATCH BLAKE2_FUNCTIONS[] = {
 207     { OSSL_FUNC_MAC_NEWCTX, (void (*)(void))blake2_mac_new },
 208     { OSSL_FUNC_MAC_DUPCTX, (void (*)(void))blake2_mac_dup },
 209     { OSSL_FUNC_MAC_FREECTX, (void (*)(void))blake2_mac_free },
 210     { OSSL_FUNC_MAC_INIT, (void (*)(void))blake2_mac_init },
 211     { OSSL_FUNC_MAC_UPDATE, (void (*)(void))blake2_mac_update },
 212     { OSSL_FUNC_MAC_FINAL, (void (*)(void))blake2_mac_final },
 213     { OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS,
 214       (void (*)(void))blake2_gettable_ctx_params },
 215     { OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))blake2_get_ctx_params },
 216     { OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
 217       (void (*)(void))blake2_mac_settable_ctx_params },
 218     { OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))blake2_mac_set_ctx_params },
 219     { 0, NULL }
 220 };