1d9e397b599b13d642138480a28c14db7a136bf0Adam Langley/* Copyright (c) 2014, Google Inc. 2d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 3d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * Permission to use, copy, modify, and/or distribute this software for any 4d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * purpose with or without fee is hereby granted, provided that the above 5d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * copyright notice and this permission notice appear in all copies. 6d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 7d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 8d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 10d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 12d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 13d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ 14d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 15d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#ifndef OPENSSL_HEADER_CHACHA_H 16d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#define OPENSSL_HEADER_CHACHA_H 17d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 18d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <openssl/base.h> 19d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 20921ef2c09591ea1f04625e01b800ac4493a8916dRobert Sloan#if defined(__cplusplus) 21d9e397b599b13d642138480a28c14db7a136bf0Adam Langleyextern "C" { 22d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#endif 23d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 24921ef2c09591ea1f04625e01b800ac4493a8916dRobert Sloan// ChaCha20. 25921ef2c09591ea1f04625e01b800ac4493a8916dRobert Sloan// 26921ef2c09591ea1f04625e01b800ac4493a8916dRobert Sloan// ChaCha20 is a stream cipher. See https://tools.ietf.org/html/rfc7539. 27921ef2c09591ea1f04625e01b800ac4493a8916dRobert Sloan 28d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 298f860b133896bf655e4342ecefe692d52df81d48Robert Sloan// CRYPTO_chacha_20 encrypts |in_len| bytes from |in| with the given key and 308f860b133896bf655e4342ecefe692d52df81d48Robert Sloan// nonce and writes the result to |out|. If |in| and |out| alias, they must be 318f860b133896bf655e4342ecefe692d52df81d48Robert Sloan// equal. The initial block counter is specified by |counter|. 32b8494591d1b1a143f3b192d845c238bbf3bc629dKenny RootOPENSSL_EXPORT void CRYPTO_chacha_20(uint8_t *out, const uint8_t *in, 33b8494591d1b1a143f3b192d845c238bbf3bc629dKenny Root size_t in_len, const uint8_t key[32], 34e99801b603dea8893dcc61c70b327ef2d00b652cKenny Root const uint8_t nonce[12], uint32_t counter); 35d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 36d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 37d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#if defined(__cplusplus) 388f860b133896bf655e4342ecefe692d52df81d48Robert Sloan} // extern C 39d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#endif 40d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 418f860b133896bf655e4342ecefe692d52df81d48Robert Sloan#endif // OPENSSL_HEADER_CHACHA_H 42