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CRYPTO_CHACHA20 implements the RFC 8439/IETF parameterization (32-bit counter + 96-bit nonce). SSH's chacha20-poly1305@openssh.com uses the original DJB construction instead: a 64-bit block counter in state words 12..13 and a 64-bit nonce in words 14..15 (libtomcrypt's chacha_ivctr64). The two layouts produce different keystreams for the same key, so an SSH server cannot interoperate with OpenSSH clients through the IETF variant. Signed-off-by: Felipe Moura <moura.fmo@gmail.com>
102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/****************************************************************************
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* include/crypto/chachapoly.h
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*
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* SPDX-License-Identifier: ISC
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* SPDX-FileCopyrightText:2015 Mike Belopuhov
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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****************************************************************************/
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#ifndef __INCLUDE_CRYPTO_CHACHAPOLY_H
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#define __INCLUDE_CRYPTO_CHACHAPOLY_H
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#define CHACHA20_KEYSIZE 32
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#define CHACHA20_CTR 4
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#define CHACHA20_SALT 4
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#define CHACHA20_NONCE 4
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#define CHACHA20_BLOCK_LEN 64
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struct chacha20_ctx
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{
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uint8_t block[CHACHA20_BLOCK_LEN];
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uint8_t nonce[CHACHA20_NONCE];
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};
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int chacha20_setkey(FAR void *, FAR uint8_t *, int);
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void chacha20_reinit(caddr_t, FAR uint8_t *);
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void chacha20_crypt(caddr_t, FAR uint8_t *, size_t);
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void chachapoly_reinit(caddr_t, FAR uint8_t *);
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int chacha20_djb_setkey(FAR void *, FAR uint8_t *, int);
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void chacha20_djb_reinit(caddr_t, FAR uint8_t *);
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#define POLY1305_KEYLEN 64
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#define POLY1305_TAGLEN 16
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#define POLY1305_BLOCK_LEN 16
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struct poly1305_ctx
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{
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/* r, h, pad, leftover */
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unsigned long state[5 + 5 + 4];
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size_t leftover;
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unsigned char buffer[POLY1305_BLOCK_LEN];
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unsigned char final;
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};
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typedef struct
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{
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uint8_t key[POLY1305_KEYLEN];
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/* counter, salt */
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uint8_t nonce[CHACHA20_NONCE];
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struct chacha20_ctx chacha;
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struct poly1305_ctx poly;
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}
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CHACHA20_POLY1305_CTX;
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void chacha20_poly1305_init(FAR void *);
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void chacha20_poly1305_setkey(FAR void *, FAR const uint8_t *, uint16_t);
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void chacha20_poly1305_reinit(FAR void *, FAR const uint8_t *, uint16_t);
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int chacha20_poly1305_update(FAR void *, FAR const uint8_t *, size_t);
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void chacha20_poly1305_final(FAR uint8_t *, FAR void *);
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/* WireGuard crypto */
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#define CHACHA20POLY1305_KEY_SIZE CHACHA20_KEYSIZE
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#define CHACHA20POLY1305_AUTHTAG_SIZE POLY1305_TAGLEN
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#define XCHACHA20POLY1305_NONCE_SIZE 24
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void chacha20poly1305_encrypt(
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FAR uint8_t *, FAR const uint8_t *, const size_t,
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FAR const uint8_t *, const size_t, const uint64_t,
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FAR const uint8_t *);
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int chacha20poly1305_decrypt(
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FAR uint8_t *, FAR const uint8_t *, const size_t,
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FAR const uint8_t *, const size_t, const uint64_t,
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FAR const uint8_t *);
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void xchacha20poly1305_encrypt(
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FAR uint8_t *, FAR const uint8_t *, const size_t,
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FAR const uint8_t *, const size_t,
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FAR const uint8_t *,
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FAR const uint8_t *);
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int xchacha20poly1305_decrypt(
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FAR uint8_t *, FAR const uint8_t *, const size_t,
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FAR const uint8_t *, const size_t,
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FAR const uint8_t *,
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FAR const uint8_t *);
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#endif /* __INCLUDE_CRYPTO_CHACHAPOLY_H */
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