ctr.h - mozsearch

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef CTR_H

#define CTR_H 1

#include "blapii.h"

/* This structure is defined in this header because both ctr.c and gcm.c

 * need it. */

struct CTRContextStr {

    freeblCipherFunc cipher;

    void *context;

    unsigned char counter[MAX_BLOCK_SIZE];

    unsigned char buffer[MAX_BLOCK_SIZE];

    unsigned char counterFirst[MAX_BLOCK_SIZE]; /* counter overlfow value */

    PRBool checkWrap;                           /*check for counter overflow*/

    unsigned long counterBits;

    unsigned int bufPtr;

};

typedef struct CTRContextStr CTRContext;

SECStatus CTR_InitContext(CTRContext *ctr, void *context,

                          freeblCipherFunc cipher, const unsigned char *param);

/*

 * The context argument is the inner cipher context to use with cipher. The

 * CTRContext does not own context. context needs to remain valid for as long

 * as the CTRContext is valid.

 * The cipher argument is a block cipher in the ECB encrypt mode.

*/

CTRContext *CTR_CreateContext(void *context, freeblCipherFunc cipher,

                              const unsigned char *param);

void CTR_DestroyContext(CTRContext *ctr, PRBool freeit);

SECStatus CTR_Update(CTRContext *ctr, unsigned char *outbuf,

                     unsigned int *outlen, unsigned int maxout,

                     const unsigned char *inbuf, unsigned int inlen,

                     unsigned int blocksize);

#ifdef USE_HW_AES

SECStatus CTR_Update_HW_AES(CTRContext *ctr, unsigned char *outbuf,

                            unsigned int *outlen, unsigned int maxout,

                            const unsigned char *inbuf, unsigned int inlen,

                            unsigned int blocksize);

#endif

#endif