1 /* 2 * Copyright (c) 2015 Mike Belopuhov 3 * Copyright (c) 2023 Aaron LI <aly@aaronly.me> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #ifndef _CHACHAPOLY_H_ 19 #define _CHACHAPOLY_H_ 20 21 #define CHACHA20POLY1305_KEY_SIZE 32 22 #define CHACHA20POLY1305_AUTHTAG_SIZE 16 23 #define CHACHA20POLY1305_NONCE_SIZE 12 24 #define XCHACHA20POLY1305_NONCE_SIZE 24 25 26 /* 27 * ChaCha20-Poly1305 AEAD cipher (RFC 8439) 28 * 29 * NOTE: Support in-place encryption/decryption; i.e., the output buffer 30 * points to the same location as the input. 31 */ 32 void chacha20poly1305_encrypt(uint8_t *, const uint8_t *, size_t, 33 const uint8_t *, size_t, 34 const uint8_t[CHACHA20POLY1305_NONCE_SIZE], 35 const uint8_t[CHACHA20POLY1305_KEY_SIZE]); 36 bool chacha20poly1305_decrypt(uint8_t *, const uint8_t *, size_t, 37 const uint8_t *, size_t, 38 const uint8_t[CHACHA20POLY1305_NONCE_SIZE], 39 const uint8_t[CHACHA20POLY1305_KEY_SIZE]); 40 41 /* 42 * XChaCha20-Poly1305 AEAD cipher 43 * (extended nonce size from 96 bits to 192 bits) 44 * 45 * NOTE: Support in-place encryption/decryption, as above. 46 */ 47 void xchacha20poly1305_encrypt(uint8_t *, const uint8_t *, size_t, 48 const uint8_t *, size_t, 49 const uint8_t[XCHACHA20POLY1305_NONCE_SIZE], 50 const uint8_t[CHACHA20POLY1305_KEY_SIZE]); 51 bool xchacha20poly1305_decrypt(uint8_t *, const uint8_t *, size_t, 52 const uint8_t *, size_t, 53 const uint8_t[XCHACHA20POLY1305_NONCE_SIZE], 54 const uint8_t[CHACHA20POLY1305_KEY_SIZE]); 55 56 #endif /* _CHACHAPOLY_H_ */ 57