1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef _NANOHUB_SHA2_H_
18 #define _NANOHUB_SHA2_H_
19 
20 //this is neither the fastest nor the smallest. but it is simple and matches the spec. cool.
21 
22 #include <stdint.h>
23 
24 #define SHA2_BLOCK_SIZE         64U //in bytes
25 #define SHA2_WORDS_STATE_SIZE   64U //in words
26 
27 #define SHA2_HASH_SIZE          32U //in bytes
28 #define SHA2_HASH_WORDS         8U  //in words
29 
30 struct Sha2state {
31     uint32_t h[8];
32     uint64_t msgLen;
33     union {
34         uint32_t w[SHA2_WORDS_STATE_SIZE];
35         uint8_t b[SHA2_BLOCK_SIZE];
36     };
37     uint8_t bufBytesUsed;
38 };
39 
40 void sha2init(struct Sha2state *state);
41 void sha2processBytes(struct Sha2state *state, const void *bytes, uint32_t numBytes);
42 const uint32_t* sha2finish(struct Sha2state *state); //returned hash pointer is only valid as long as "state" is!
43 
44 
45 
46 
47 
48 #endif // _NANOHUB_SHA2_H_
49 
50