providers/common/include/internal/provider_util.h

   1 /*
   2  * Copyright 2019 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/provider.h>
  11 #include <openssl/engine.h>
  12
  13 typedef struct {
  14     /*
  15      * References to the underlying cipher implementation.  |cipher| caches
  16      * the cipher, always.  |alloc_cipher| only holds a reference to an
  17      * explicitly fetched cipher.
  18      */
  19     const EVP_CIPHER *cipher;   /* cipher */
  20     EVP_CIPHER *alloc_cipher;   /* fetched cipher */
  21
  22     /* Conditions for legacy EVP_CIPHER uses */
  23     ENGINE *engine;             /* cipher engine */
  24 } PROV_CIPHER;
  25
  26 typedef struct {
  27     /*
  28      * References to the underlying digest implementation.  |md| caches
  29      * the digest, always.  |alloc_md| only holds a reference to an explicitly
  30      * fetched digest.
  31      */
  32     const EVP_MD *md;           /* digest */
  33     EVP_MD *alloc_md;           /* fetched digest */
  34
  35     /* Conditions for legacy EVP_MD uses */
  36     ENGINE *engine;             /* digest engine */
  37 } PROV_DIGEST;
  38
  39 /* Cipher functions */
  40 /*
  41  * Load a cipher from the specified parameters with the specified context.
  42  * The params "properties", "engine" and "cipher" are used to determine the
  43  * implementation used.  If a provider cannot be found, it falls back to trying
  44  * non-provider based implementations.
  45  */
  46 int ossl_prov_cipher_load_from_params(PROV_CIPHER *pc,
  47                                       const OSSL_PARAM params[],
  48                                       OPENSSL_CTX *ctx);
  49
  50 /* Reset the PROV_CIPHER fields and free any allocated cipher reference */
  51 void ossl_prov_cipher_reset(PROV_CIPHER *pc);
  52
  53 /* Clone a PROV_CIPHER structure into a second */
  54 int ossl_prov_cipher_copy(PROV_CIPHER *dst, const PROV_CIPHER *src);
  55
  56 /* Query the cipher and associated engine (if any) */
  57 const EVP_CIPHER *ossl_prov_cipher_cipher(const PROV_CIPHER *pc);
  58 ENGINE *ossl_prov_cipher_engine(const PROV_CIPHER *pc);
  59
  60 /* Digest functions */
  61 /*
  62  * Load a digest from the specified parameters with the specified context.
  63  * The params "properties", "engine" and "digest" are used to determine the
  64  * implementation used.  If a provider cannot be found, it falls back to trying
  65  * non-provider based implementations.
  66  */
  67 int ossl_prov_digest_load_from_params(PROV_DIGEST *pd,
  68                                       const OSSL_PARAM params[],
  69                                       OPENSSL_CTX *ctx);
  70
  71 /* Reset the PROV_DIGEST fields and free any allocated digest reference */
  72 void ossl_prov_digest_reset(PROV_DIGEST *pd);
  73
  74 /* Clone a PROV_DIGEST structure into a second */
  75 int ossl_prov_digest_copy(PROV_DIGEST *dst, const PROV_DIGEST *src);
  76
  77 /* Query the digest and associated engine (if any) */
  78 const EVP_MD *ossl_prov_digest_md(const PROV_DIGEST *pd);
  79 ENGINE *ossl_prov_digest_engine(const PROV_DIGEST *pd);
  80
  81 /* MAC functions */
  82 /*
  83  * Load an EVP_MAC_CTX* from the specified parameters with the specified
  84  * library context.
  85  * The params "mac" and "properties" are used to determine the implementation
  86  * used, and the parameters "digest", "cipher", "engine" and "properties" are
  87  * passed to the MAC via the created MAC context if they are given.
  88  * If there is already a created MAC context, it will be replaced if the "mac"
  89  * parameter is found, otherwise it will simply be used as is, and passed the
  90  * parameters to pilfer as it sees fit.
  91  *
  92  * As an option, a MAC name may be explicitly given, and if it is, the "mac"
  93  * parameter will be ignored.
  94  * Similarly, as an option, a cipher name or a digest name may be explicitly
  95  * given, and if any of them is, the "digest" and "cipher" parameters are
  96  * ignored.
  97  */
  98 int ossl_prov_macctx_load_from_params(EVP_MAC_CTX **macctx,
  99                                       const OSSL_PARAM params[],
 100                                       const char *macname,
 101                                       const char *ciphername,
 102                                       const char *mdname,
 103                                       OPENSSL_CTX *ctx);