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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2019
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
Header file for Synthetic Initialization Vector (SIV) ciphers.
*/
#ifndef GOT_SIV_H
#define GOT_SIV_H
/* Maximum key length of all supported SIVs */
#define SIV_MAX_KEY_LENGTH 32
/* Maximum difference between lengths of ciphertext and plaintext */
#define SIV_MAX_TAG_LENGTH 16
/* Identifiers of SIV algorithms following the IANA AEAD registry */
typedef enum {
AEAD_AES_SIV_CMAC_256 = 15,
AEAD_AES_SIV_CMAC_384 = 16,
AEAD_AES_SIV_CMAC_512 = 17,
AEAD_AES_128_GCM_SIV = 30,
AEAD_AES_256_GCM_SIV = 31,
} SIV_Algorithm;
typedef struct SIV_Instance_Record *SIV_Instance;
extern SIV_Instance SIV_CreateInstance(SIV_Algorithm algorithm);
extern void SIV_DestroyInstance(SIV_Instance instance);
extern int SIV_GetKeyLength(SIV_Algorithm algorithm);
extern int SIV_SetKey(SIV_Instance instance, const unsigned char *key, int length);
extern int SIV_GetMinNonceLength(SIV_Instance instance);
extern int SIV_GetMaxNonceLength(SIV_Instance instance);
extern int SIV_GetTagLength(SIV_Instance instance);
extern int SIV_Encrypt(SIV_Instance instance,
const unsigned char *nonce, int nonce_length,
const void *assoc, int assoc_length,
const void *plaintext, int plaintext_length,
unsigned char *ciphertext, int ciphertext_length);
extern int SIV_Decrypt(SIV_Instance instance,
const unsigned char *nonce, int nonce_length,
const void *assoc, int assoc_length,
const unsigned char *ciphertext, int ciphertext_length,
void *plaintext, int plaintext_length);
#endif
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