93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
//
|
|
// The MIT License (MIT)
|
|
//
|
|
// Copyright (c) 2023 Ihar Katkavets
|
|
|
|
// Permission is hereby granted, free of charge, to any person obtaining
|
|
// a copy of this software and associated documentation files (the
|
|
// "Software"), to deal in the Software without restriction, including
|
|
// without limitation the rights to use, copy, modify, merge, publish,
|
|
// distribute, sublicense, and/or sell copies of the Software, and to
|
|
// permit persons to whom the Software is furnished to do so, subject to
|
|
// the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be
|
|
// included in all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
//
|
|
|
|
/**
|
|
* Salsa 20 implementation adopted from the reference
|
|
* implementation by D. J. Bernstein https://cr.yp.to/chacha.html
|
|
* Taken from https://cr.yp.to/streamciphers/timings/estreambench/submissions/salsa20/chacha8/ref/ecrypt-sync.h
|
|
* Public domain.
|
|
*/
|
|
|
|
#ifndef chacha_h
|
|
#define chacha_h
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#include <stdint.h>
|
|
|
|
typedef uint8_t u8;
|
|
typedef uint32_t u32;
|
|
|
|
typedef struct
|
|
{
|
|
u32 input[16]; /* could be compressed */
|
|
} CHACHA20_ctx;
|
|
|
|
void CHACHA20_init();
|
|
|
|
void CHACHA20_keysetup(
|
|
CHACHA20_ctx* ctx,
|
|
const u8* key,
|
|
u32 keysize, /* Key size in bits. */
|
|
u32 ivsize); /* IV size in bits. */
|
|
|
|
void CHACHA20_ivsetup(
|
|
CHACHA20_ctx* ctx,
|
|
const u8* iv);
|
|
|
|
void CHACHA20_encrypt_bytes(
|
|
CHACHA20_ctx* ctx,
|
|
const u8* plaintext,
|
|
u8* ciphertext,
|
|
u32 msglen); /* Message length in bytes. */
|
|
|
|
void CHACHA20_decrypt_bytes(
|
|
CHACHA20_ctx* ctx,
|
|
const u8* ciphertext,
|
|
u8* plaintext,
|
|
u32 msglen); /* Message length in bytes. */
|
|
|
|
#define CHACHA20_BLOCKLENGTH 64 /* [edit] */
|
|
|
|
void CHACHA20_encrypt_blocks(
|
|
CHACHA20_ctx* ctx,
|
|
const u8* plaintext,
|
|
u8* ciphertext,
|
|
u32 blocks); /* Message length in blocks. */
|
|
|
|
void CHACHA20_decrypt_blocks(
|
|
CHACHA20_ctx* ctx,
|
|
const u8* ciphertext,
|
|
u8* plaintext,
|
|
u32 blocks); /* Message length in blocks. */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* salsa20_h */
|