Home | History | Annotate | Download | only in libavb 
      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Permission is hereby granted, free of charge, to any person
      5  * obtaining a copy of this software and associated documentation
      6  * files (the "Software"), to deal in the Software without
      7  * restriction, including without limitation the rights to use, copy,
      8  * modify, merge, publish, distribute, sublicense, and/or sell copies
      9  * of the Software, and to permit persons to whom the Software is
     10  * furnished to do so, subject to the following conditions:
     11  *
     12  * The above copyright notice and this permission notice shall be
     13  * included in all copies or substantial portions of the Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     22  * SOFTWARE.
     23  */
     24 
     25 #ifdef AVB_INSIDE_LIBAVB_H
     26 #error "You can't include avb_sha.h in the public header libavb.h."
     27 #endif
     28 
     29 #ifndef AVB_COMPILATION
     30 #error "Never include this file, it may only be used from internal avb code."
     31 #endif
     32 
     33 #ifndef AVB_SHA_H_
     34 #define AVB_SHA_H_
     35 
     36 #ifdef __cplusplus
     37 extern "C" {
     38 #endif
     39 
     40 #include "avb_crypto.h"
     41 #include "avb_sysdeps.h"
     42 
     43 /* Block size in bytes of a SHA-256 digest. */
     44 #define AVB_SHA256_BLOCK_SIZE 64
     45 
     46 
     47 /* Block size in bytes of a SHA-512 digest. */
     48 #define AVB_SHA512_BLOCK_SIZE 128
     49 
     50 /* Data structure used for SHA-256. */
     51 typedef struct {
     52   uint32_t h[8];
     53   uint32_t tot_len;
     54   uint32_t len;
     55   uint8_t block[2 * AVB_SHA256_BLOCK_SIZE];
     56   uint8_t buf[AVB_SHA256_DIGEST_SIZE]; /* Used for storing the final digest. */
     57 } AvbSHA256Ctx;
     58 
     59 /* Data structure used for SHA-512. */
     60 typedef struct {
     61   uint64_t h[8];
     62   uint32_t tot_len;
     63   uint32_t len;
     64   uint8_t block[2 * AVB_SHA512_BLOCK_SIZE];
     65   uint8_t buf[AVB_SHA512_DIGEST_SIZE]; /* Used for storing the final digest. */
     66 } AvbSHA512Ctx;
     67 
     68 /* Initializes the SHA-256 context. */
     69 void avb_sha256_init(AvbSHA256Ctx* ctx);
     70 
     71 /* Updates the SHA-256 context with |len| bytes from |data|. */
     72 void avb_sha256_update(AvbSHA256Ctx* ctx, const uint8_t* data, uint32_t len);
     73 
     74 /* Returns the SHA-256 digest. */
     75 uint8_t* avb_sha256_final(AvbSHA256Ctx* ctx) AVB_ATTR_WARN_UNUSED_RESULT;
     76 
     77 /* Initializes the SHA-512 context. */
     78 void avb_sha512_init(AvbSHA512Ctx* ctx);
     79 
     80 /* Updates the SHA-512 context with |len| bytes from |data|. */
     81 void avb_sha512_update(AvbSHA512Ctx* ctx, const uint8_t* data, uint32_t len);
     82 
     83 /* Returns the SHA-512 digest. */
     84 uint8_t* avb_sha512_final(AvbSHA512Ctx* ctx) AVB_ATTR_WARN_UNUSED_RESULT;
     85 
     86 #ifdef __cplusplus
     87 }
     88 #endif
     89 
     90 #endif /* AVB_SHA_H_ */
     91