225 lines
8.3 KiB
C
225 lines
8.3 KiB
C
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/**
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* Copyright (c) 2019 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/**@file
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* @defgroup nrf_oberon_chacha_poly ChaCha20-Poly1305
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* @ingroup nrf_oberon
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* @{
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* @brief ChaCha20-Poly1305 is an authenticated encryption algorithm with optional
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* additional authenticated data developed by Daniel J.Bernstein.
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* @}
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*
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* @defgroup nrf_oberon_chacha_poly_apis ChaCha20-Poly1305 APIs
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* @ingroup nrf_oberon_chacha_poly
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* @{
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* @brief Type declaration and APIs for authenticated encryption and additional data using
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* the ChaCha20-Poly1305 algorithm.
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*
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* ChaCha20-Poly1305 is an authenticated encryption algorithm with optional
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* additional authenticated data developed by Daniel J.Bernstein.
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*
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* The ChaCha20 stream cipher is combined with the Poly1305 authenticator.
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*
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* @see [RFC 7539 - ChaCha20 and Poly1305 for IETF Protocols](http://tools.ietf.org/html/rfc7539)
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*/
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#ifndef OCRYPTO_CHACHA20_POLY1305_H
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#define OCRYPTO_CHACHA20_POLY1305_H
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#include <stddef.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Length of the encryption key.
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*/
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#define ocrypto_chacha20_poly1305_KEY_BYTES (32)
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/**
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* Maximum length of the nonce.
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*/
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#define ocrypto_chacha20_poly1305_NONCE_BYTES_MAX (12)
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/**
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* Length of the authentication tag.
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*/
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#define ocrypto_chacha20_poly1305_TAG_BYTES (16)
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/**@{*/
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/**
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* AEAD ChaCha20-Poly1305 encrypt.
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*
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* The message @p m is encrypted using a ChaCha20 cipher stream derived from the
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* encryption key @p k and the nonce @p n. The resulting ciphertext has the same
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* length @p m_len as the input message @p m and is put into @p c.
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*
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* Additionally, the ciphertext @p c is authenticated with a tag that is
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* generated with Poly1305 using a unique subkey derived from @p k and @p n, and
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* then put into @p tag.
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*
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* @param[out] tag Generated authentication tag.
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* @param[out] c Generated ciphertext. Same length as input message.
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* @param m Input message.
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* @param m_len Length of @p m and @p c.
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* @param n Nonce.
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* @param n_len Length of @p n. 0 <= @p n_len <= @c ocrypto_chacha20_poly1305_NONCE_BYTES_MAX.
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* @param k Encryption key.
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*
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* @remark @p c and @p m can point to the same address.
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*
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* @remark When reusing an encryption key @p k for a different message @p m, a
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* different nonce @p n must be used.
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*/
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void ocrypto_chacha20_poly1305_encrypt(
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uint8_t tag[ocrypto_chacha20_poly1305_TAG_BYTES],
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uint8_t *c,
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const uint8_t *m, size_t m_len,
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const uint8_t *n, size_t n_len,
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const uint8_t k[ocrypto_chacha20_poly1305_KEY_BYTES]);
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/**
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* AEAD ChaCha20-Poly1305 encrypt with AAD.
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*
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* The message @p m is encrypted using a ChaCha20 cipher stream derived from the
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* encryption key @p k and the nonce @p n. The resulting ciphertext has the same
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* length @p m_len as the input message @p m and is put into @p c.
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*
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* Additionally, the ciphertext @p c, as well as the additional authenticated
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* data @p a, is authenticated with a tag that is generated with Poly1305 using a
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* unique subkey derived from @p k and @p n, and then put into @p tag.
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*
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* @param[out] tag Generated authentication tag.
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* @param[out] c Generated ciphertext. Same length as input message.
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* @param m Input message.
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* @param m_len Length of @p m and @p c.
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* @param a Additional authenticated data.
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* @param a_len Length of @p a.
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* @param n Nonce.
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* @param n_len Length of @p n. 0 <= @p n_len <= @c ocrypto_chacha20_poly1305_NONCE_BYTES_MAX.
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* @param k Encryption key.
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*
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* @remark @p c and @p m can point to the same address.
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*
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* @remark When reusing an encryption key @p k for a different message @p m or
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* different additional authenticated data @p a, a different nonce @p n
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* must be used.
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*/
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void ocrypto_chacha20_poly1305_encrypt_aad(
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uint8_t tag[ocrypto_chacha20_poly1305_TAG_BYTES],
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uint8_t *c,
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const uint8_t *m, size_t m_len,
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const uint8_t *a, size_t a_len,
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const uint8_t *n, size_t n_len,
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const uint8_t k[ocrypto_chacha20_poly1305_KEY_BYTES]);
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/**@}*/
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/**@{*/
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/**
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* AEAD ChaCha20-Poly1305 decrypt.
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*
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* If the authentication tag @p tag is valid for the ciphertext @p c, the
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* encryption key @p k and the nonce @p n, the ciphertext is decrypted and put
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* into @p m. The decrypted message @p m has the same length @p c_len as the
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* original ciphertext.
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*
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* @param tag Received authentication tag.
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* @param[out] m Decoded message. Same length as received ciphertext.
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* @param c Received ciphertext.
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* @param c_len Length of @p c and @p m.
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* @param n Nonce.
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* @param n_len Length of @p n. 0 <= @p n_len <= @c ocrypto_chacha20_poly1305_NONCE_BYTES_MAX.
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* @param k Encryption key.
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*
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* @retval 0 If @p tag is valid.
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* @retval -1 Otherwise.
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*
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* @remark @p m and @p c can point to the same address.
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*/
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int ocrypto_chacha20_poly1305_decrypt(
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const uint8_t tag[ocrypto_chacha20_poly1305_TAG_BYTES],
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uint8_t *m,
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const uint8_t *c, size_t c_len,
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const uint8_t *n, size_t n_len,
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const uint8_t k[ocrypto_chacha20_poly1305_KEY_BYTES]);
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/**
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* AEAD ChaCha20-Poly1305 decrypt with AAD.
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*
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* If the authentication tag @p tag is valid for the ciphertext @p c, the
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* additional authenticated data @p a, the encryption key @p k and the nonce
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* @p n, the ciphertext is decrypted and put into @p m. The decrypted message
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* @p m has the same length @p c_len as the original ciphertext.
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*
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* @param tag Received authentication tag.
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* @param[out] m Decoded message. Same length as received ciphertext.
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* @param c Received ciphertext.
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* @param c_len Length of @p c and @p m.
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* @param a Received additional authenticated data.
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* @param a_len Length of @p a.
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* @param n Nonce.
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* @param n_len Length of @p n. 0 <= @p n_len <= @c ocrypto_chacha20_poly1305_NONCE_BYTES_MAX.
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* @param k Encryption key.
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*
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* @retval 0 If @p tag is valid.
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* @retval -1 Otherwise.
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*
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* @remark @p m and @p c can point to the same address.
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*/
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int ocrypto_chacha20_poly1305_decrypt_aad(
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const uint8_t tag[ocrypto_chacha20_poly1305_TAG_BYTES],
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uint8_t *m,
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const uint8_t *c, size_t c_len,
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const uint8_t *a, size_t a_len,
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const uint8_t *n, size_t n_len,
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const uint8_t k[ocrypto_chacha20_poly1305_KEY_BYTES]);
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/**@}*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* #ifndef OCRYPTO_CHACHA20_POLY1305_H */
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/** @} */
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