providers/implementations/macs/cmac_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 /*
  11  * CMAC low level APIs are deprecated for public use, but still ok for internal
  12  * use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <openssl/core_dispatch.h>
  17 #include <openssl/core_names.h>
  18 #include <openssl/params.h>
  19 #include <openssl/engine.h>
  20 #include <openssl/evp.h>
  21 #include <openssl/cmac.h>
  22
  23 #include "prov/implementations.h"
  24 #include "prov/provider_ctx.h"
  25 #include "prov/provider_util.h"
  26
  27 /*
  28  * Forward declaration of everything implemented here.  This is not strictly
  29  * necessary for the compiler, but provides an assurance that the signatures
  30  * of the functions in the dispatch table are correct.
  31  */
  32 static OSSL_FUNC_mac_newctx_fn cmac_new;
  33 static OSSL_FUNC_mac_dupctx_fn cmac_dup;
  34 static OSSL_FUNC_mac_freectx_fn cmac_free;
  35 static OSSL_FUNC_mac_gettable_ctx_params_fn cmac_gettable_ctx_params;
  36 static OSSL_FUNC_mac_get_ctx_params_fn cmac_get_ctx_params;
  37 static OSSL_FUNC_mac_settable_ctx_params_fn cmac_settable_ctx_params;
  38 static OSSL_FUNC_mac_set_ctx_params_fn cmac_set_ctx_params;
  39 static OSSL_FUNC_mac_init_fn cmac_init;
  40 static OSSL_FUNC_mac_update_fn cmac_update;
  41 static OSSL_FUNC_mac_final_fn cmac_final;
  42
  43 /* local CMAC data */
  44
  45 struct cmac_data_st {
  46     void *provctx;
  47     CMAC_CTX *ctx;
  48     PROV_CIPHER cipher;
  49 };
  50
  51 static void *cmac_new(void *provctx)
  52 {
  53     struct cmac_data_st *macctx;
  54
  55     if ((macctx = OPENSSL_zalloc(sizeof(*macctx))) == NULL
  56         || (macctx->ctx = CMAC_CTX_new()) == NULL) {
  57         OPENSSL_free(macctx);
  58         macctx = NULL;
  59     } else {
  60         macctx->provctx = provctx;
  61     }
  62
  63     return macctx;
  64 }
  65
  66 static void cmac_free(void *vmacctx)
  67 {
  68     struct cmac_data_st *macctx = vmacctx;
  69
  70     if (macctx != NULL) {
  71         CMAC_CTX_free(macctx->ctx);
  72         ossl_prov_cipher_reset(&macctx->cipher);
  73         OPENSSL_free(macctx);
  74     }
  75 }
  76
  77 static void *cmac_dup(void *vsrc)
  78 {
  79     struct cmac_data_st *src = vsrc;
  80     struct cmac_data_st *dst = cmac_new(src->provctx);
  81
  82     if (!CMAC_CTX_copy(dst->ctx, src->ctx)
  83         || !ossl_prov_cipher_copy(&dst->cipher, &src->cipher)) {
  84         cmac_free(dst);
  85         return NULL;
  86     }
  87     return dst;
  88 }
  89
  90 static size_t cmac_size(void *vmacctx)
  91 {
  92     struct cmac_data_st *macctx = vmacctx;
  93
  94     return EVP_CIPHER_CTX_block_size(CMAC_CTX_get0_cipher_ctx(macctx->ctx));
  95 }
  96
  97 static int cmac_init(void *vmacctx)
  98 {
  99     struct cmac_data_st *macctx = vmacctx;
 100     int rv = CMAC_Init(macctx->ctx, NULL, 0,
 101                        ossl_prov_cipher_cipher(&macctx->cipher),
 102                        ossl_prov_cipher_engine(&macctx->cipher));
 103
 104     ossl_prov_cipher_reset(&macctx->cipher);
 105     return rv;
 106 }
 107
 108 static int cmac_update(void *vmacctx, const unsigned char *data,
 109                        size_t datalen)
 110 {
 111     struct cmac_data_st *macctx = vmacctx;
 112
 113     return CMAC_Update(macctx->ctx, data, datalen);
 114 }
 115
 116 static int cmac_final(void *vmacctx, unsigned char *out, size_t *outl,
 117                       size_t outsize)
 118 {
 119     struct cmac_data_st *macctx = vmacctx;
 120
 121     return CMAC_Final(macctx->ctx, out, outl);
 122 }
 123
 124 static const OSSL_PARAM known_gettable_ctx_params[] = {
 125     OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
 126     OSSL_PARAM_END
 127 };
 128 static const OSSL_PARAM *cmac_gettable_ctx_params(void)
 129 {
 130     return known_gettable_ctx_params;
 131 }
 132
 133 static int cmac_get_ctx_params(void *vmacctx, OSSL_PARAM params[])
 134 {
 135     OSSL_PARAM *p;
 136
 137     if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
 138         return OSSL_PARAM_set_size_t(p, cmac_size(vmacctx));
 139
 140     return 1;
 141 }
 142
 143 static const OSSL_PARAM known_settable_ctx_params[] = {
 144     OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_CIPHER, NULL, 0),
 145     OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_PROPERTIES, NULL, 0),
 146     OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
 147     OSSL_PARAM_END
 148 };
 149 static const OSSL_PARAM *cmac_settable_ctx_params(void)
 150 {
 151     return known_settable_ctx_params;
 152 }
 153
 154 /*
 155  * ALL parameters should be set before init().
 156  */
 157 static int cmac_set_ctx_params(void *vmacctx, const OSSL_PARAM params[])
 158 {
 159     struct cmac_data_st *macctx = vmacctx;
 160     OPENSSL_CTX *ctx = PROV_LIBRARY_CONTEXT_OF(macctx->provctx);
 161     const OSSL_PARAM *p;
 162
 163     if (!ossl_prov_cipher_load_from_params(&macctx->cipher, params, ctx))
 164         return 0;
 165
 166     if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL) {
 167         if (p->data_type != OSSL_PARAM_OCTET_STRING)
 168             return 0;
 169
 170         if (!CMAC_Init(macctx->ctx, p->data, p->data_size,
 171                        ossl_prov_cipher_cipher(&macctx->cipher),
 172                        ossl_prov_cipher_engine(&macctx->cipher)))
 173             return 0;
 174
 175         ossl_prov_cipher_reset(&macctx->cipher);
 176     }
 177     return 1;
 178 }
 179
 180 const OSSL_DISPATCH cmac_functions[] = {
 181     { OSSL_FUNC_MAC_NEWCTX, (void (*)(void))cmac_new },
 182     { OSSL_FUNC_MAC_DUPCTX, (void (*)(void))cmac_dup },
 183     { OSSL_FUNC_MAC_FREECTX, (void (*)(void))cmac_free },
 184     { OSSL_FUNC_MAC_INIT, (void (*)(void))cmac_init },
 185     { OSSL_FUNC_MAC_UPDATE, (void (*)(void))cmac_update },
 186     { OSSL_FUNC_MAC_FINAL, (void (*)(void))cmac_final },
 187     { OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS,
 188       (void (*)(void))cmac_gettable_ctx_params },
 189     { OSSL_FUNC_MAC_GET_CTX_PARAMS, (void (*)(void))cmac_get_ctx_params },
 190     { OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
 191       (void (*)(void))cmac_settable_ctx_params },
 192     { OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))cmac_set_ctx_params },
 193     { 0, NULL }
 194 };