mDNSCore/CryptoAlg.h

   1 /* -*- Mode: C; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2011-2012 Apple Inc. All rights reserved.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #ifndef __CRYPTO_ALG_H
  19 #define __CRYPTO_ALG_H
  20
  21 typedef enum
  22 {
  23     CRYPTO_ALG,
  24     DIGEST_ALG,
  25     ENC_ALG,
  26 } AlgType;
  27
  28 typedef struct
  29 {
  30     void *context;
  31     AlgType type;
  32     mDNSu8 alg;
  33 } AlgContext;
  34
  35 typedef struct
  36 {
  37     mStatus (*Create)(AlgContext *ctx);
  38     mStatus (*Destroy)(AlgContext *ctx);
  39     mDNSu32 (*Length)(AlgContext *ctx);
  40     mStatus (*Add)(AlgContext *ctx, const void *data, mDNSu32 len);
  41     // Verify the ctx using the key and compare it against signature/siglen
  42     mStatus (*Verify)(AlgContext *ctx, mDNSu8 *key, mDNSu32 keylen, mDNSu8 *signature, mDNSu32 siglen);
  43     // Encode the data and return the encoded data
  44     mDNSu8* (*Encode)(AlgContext *ctx);
  45     // Return the finalized data in data whose length is len (used by hash algorithms)
  46     mStatus (*Final)(AlgContext *ctx, void *data, mDNSu32 len);
  47 } AlgFuncs;
  48
  49 mDNSexport mStatus DigestAlgInit(mDNSu8 digestType, AlgFuncs *func);
  50 mDNSexport mStatus CryptoAlgInit(mDNSu8 algType, AlgFuncs *func);
  51 mDNSexport mStatus EncAlgInit(mDNSu8 algType, AlgFuncs *func);
  52
  53
  54 extern AlgContext *AlgCreate(AlgType type, mDNSu8 alg);
  55 extern mStatus AlgDestroy(AlgContext *ctx);
  56 extern mDNSu32 AlgLength(AlgContext *ctx);
  57 extern mStatus AlgAdd(AlgContext *ctx, const void *data, mDNSu32 len);
  58 extern mStatus AlgVerify(AlgContext *ctx, mDNSu8 *key, mDNSu32 keylen, mDNSu8 *signature, mDNSu32 siglen);
  59 extern mDNSu8* AlgEncode(AlgContext *ctx);
  60 extern mStatus AlgFinal(AlgContext *ctx, void *data, mDNSu32 len);
  61
  62 #endif // __CRYPTO_ALG_H