1 /* This Source Code Form is subject to the terms of the Mozilla Public
2  * License, v. 2.0. If a copy of the MPL was not distributed with this
3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
4 
5 #ifndef CTR_H
6 #define CTR_H 1
7 
8 #include "blapii.h"
9 
10 /* This structure is defined in this header because both ctr.c and gcm.c
11  * need it. */
12 struct CTRContextStr {
13     freeblCipherFunc cipher;
14     void *context;
15     unsigned char counter[MAX_BLOCK_SIZE];
16     unsigned char buffer[MAX_BLOCK_SIZE];
17     unsigned char counterFirst[MAX_BLOCK_SIZE]; /* counter overlfow value */
18     PRBool checkWrap;                           /*check for counter overflow*/
19     unsigned long counterBits;
20     unsigned int bufPtr;
21 };
22 
23 typedef struct CTRContextStr CTRContext;
24 
25 SECStatus CTR_InitContext(CTRContext *ctr, void *context,
26                           freeblCipherFunc cipher, const unsigned char *param);
CTR_InitContext(CTRContext * ctr,void * context,freeblCipherFunc cipher,const unsigned char * param)27 
28 /*
29  * The context argument is the inner cipher context to use with cipher. The
30  * CTRContext does not own context. context needs to remain valid for as long
31  * as the CTRContext is valid.
32  *
33  * The cipher argument is a block cipher in the ECB encrypt mode.
34  */
35 CTRContext *CTR_CreateContext(void *context, freeblCipherFunc cipher,
36                               const unsigned char *param);
37 
38 void CTR_DestroyContext(CTRContext *ctr, PRBool freeit);
39 
40 SECStatus CTR_Update(CTRContext *ctr, unsigned char *outbuf,
41                      unsigned int *outlen, unsigned int maxout,
42                      const unsigned char *inbuf, unsigned int inlen,
43                      unsigned int blocksize);
44 
45 #ifdef USE_HW_AES
46 SECStatus CTR_Update_HW_AES(CTRContext *ctr, unsigned char *outbuf,
47                             unsigned int *outlen, unsigned int maxout,
48                             const unsigned char *inbuf, unsigned int inlen,
49                             unsigned int blocksize);
50 #endif
51 
52 #endif
53