providers/implementations/macs/poly1305_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 <openssl/core_dispatch.h>
  11 #include <openssl/core_names.h>
  12 #include <openssl/params.h>
  13 #include <openssl/evp.h>
  14 #include <openssl/err.h>
  15
  16 #include "crypto/poly1305.h"
  17
  18 #include "prov/providercommonerr.h"
  19 #include "prov/implementations.h"
  20
  21 /*
  22  * Forward declaration of everything implemented here.  This is not strictly
  23  * necessary for the compiler, but provides an assurance that the signatures
  24  * of the functions in the dispatch table are correct.
  25  */
  26 static OSSL_FUNC_mac_newctx_fn poly1305_new;
  27 static OSSL_FUNC_mac_dupctx_fn poly1305_dup;
  28 static OSSL_FUNC_mac_freectx_fn poly1305_free;
  29 static OSSL_FUNC_mac_gettable_params_fn poly1305_gettable_params;
  30 static OSSL_FUNC_mac_get_params_fn poly1305_get_params;
  31 static OSSL_FUNC_mac_settable_ctx_params_fn poly1305_settable_ctx_params;
  32 static OSSL_FUNC_mac_set_ctx_params_fn poly1305_set_ctx_params;
  33 static OSSL_FUNC_mac_init_fn poly1305_init;
  34 static OSSL_FUNC_mac_update_fn poly1305_update;
  35 static OSSL_FUNC_mac_final_fn poly1305_final;
  36
  37 struct poly1305_data_st {
  38     void *provctx;
  39     POLY1305 poly1305;           /* Poly1305 data */
  40 };
  41
  42 static size_t poly1305_size(void);
  43
  44 static void *poly1305_new(void *provctx)
  45 {
  46     struct poly1305_data_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
  47
  48     if (ctx != NULL)
  49         ctx->provctx = provctx;
  50     return ctx;
  51 }
  52
  53 static void poly1305_free(void *vmacctx)
  54 {
  55     OPENSSL_free(vmacctx);
  56 }
  57
  58 static void *poly1305_dup(void *vsrc)
  59 {
  60     struct poly1305_data_st *src = vsrc;
  61     struct poly1305_data_st *dst = poly1305_new(src->provctx);
  62
  63     if (dst == NULL)
  64         return NULL;
  65
  66     dst->poly1305 = src->poly1305;
  67     return dst;
  68 }
  69
  70 static size_t poly1305_size(void)
  71 {
  72     return POLY1305_DIGEST_SIZE;
  73 }
  74
  75 static int poly1305_init(void *vmacctx)
  76 {
  77     /* initialize the context in MAC_ctrl function */
  78     return 1;
  79 }
  80
  81 static int poly1305_update(void *vmacctx, const unsigned char *data,
  82                        size_t datalen)
  83 {
  84     struct poly1305_data_st *ctx = vmacctx;
  85
  86     /* poly1305 has nothing to return in its update function */
  87     Poly1305_Update(&ctx->poly1305, data, datalen);
  88     return 1;
  89 }
  90
  91 static int poly1305_final(void *vmacctx, unsigned char *out, size_t *outl,
  92                           size_t outsize)
  93 {
  94     struct poly1305_data_st *ctx = vmacctx;
  95
  96     Poly1305_Final(&ctx->poly1305, out);
  97     return 1;
  98 }
  99
 100 static const OSSL_PARAM known_gettable_params[] = {
 101     OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
 102     OSSL_PARAM_END
 103 };
 104 static const OSSL_PARAM *poly1305_gettable_params(void)
 105 {
 106     return known_gettable_params;
 107 }
 108
 109 static int poly1305_get_params(OSSL_PARAM params[])
 110 {
 111     OSSL_PARAM *p;
 112
 113     if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
 114         return OSSL_PARAM_set_size_t(p, poly1305_size());
 115
 116     return 1;
 117 }
 118
 119 static const OSSL_PARAM known_settable_ctx_params[] = {
 120     OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
 121     OSSL_PARAM_END
 122 };
 123 static const OSSL_PARAM *poly1305_settable_ctx_params(void)
 124 {
 125     return known_settable_ctx_params;
 126 }
 127
 128 static int poly1305_set_ctx_params(void *vmacctx, const OSSL_PARAM *params)
 129 {
 130     struct poly1305_data_st *ctx = vmacctx;
 131     const OSSL_PARAM *p = NULL;
 132
 133     if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL) {
 134         if (p->data_type != OSSL_PARAM_OCTET_STRING
 135             || p->data_size != POLY1305_KEY_SIZE) {
 136             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
 137             return 0;
 138         }
 139         Poly1305_Init(&ctx->poly1305, p->data);
 140     }
 141     return 1;
 142 }
 143
 144 const OSSL_DISPATCH poly1305_functions[] = {
 145     { OSSL_FUNC_MAC_NEWCTX, (void (*)(void))poly1305_new },
 146     { OSSL_FUNC_MAC_DUPCTX, (void (*)(void))poly1305_dup },
 147     { OSSL_FUNC_MAC_FREECTX, (void (*)(void))poly1305_free },
 148     { OSSL_FUNC_MAC_INIT, (void (*)(void))poly1305_init },
 149     { OSSL_FUNC_MAC_UPDATE, (void (*)(void))poly1305_update },
 150     { OSSL_FUNC_MAC_FINAL, (void (*)(void))poly1305_final },
 151     { OSSL_FUNC_MAC_GETTABLE_PARAMS, (void (*)(void))poly1305_gettable_params },
 152     { OSSL_FUNC_MAC_GET_PARAMS, (void (*)(void))poly1305_get_params },
 153     { OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
 154       (void (*)(void))poly1305_settable_ctx_params },
 155     { OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))poly1305_set_ctx_params },
 156     { 0, NULL }
 157 };