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130 lines
4.2 KiB
C
130 lines
4.2 KiB
C
/* chacha20_poly1305.h
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*
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* Copyright (C) 2006-2020 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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/* This implementation of the ChaCha20-Poly1305 AEAD is based on "ChaCha20
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* and Poly1305 for IETF protocols" (draft-irtf-cfrg-chacha20-poly1305-10):
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* https://tools.ietf.org/html/draft-irtf-cfrg-chacha20-poly1305-10
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*/
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/*!
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\file wolfssl/wolfcrypt/chacha20_poly1305.h
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*/
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#ifndef WOLF_CRYPT_CHACHA20_POLY1305_H
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#define WOLF_CRYPT_CHACHA20_POLY1305_H
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#include <libwolfssl/wolfcrypt/types.h>
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#include <libwolfssl/wolfcrypt/chacha.h>
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#include <libwolfssl/wolfcrypt/poly1305.h>
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#if defined(HAVE_CHACHA) && defined(HAVE_POLY1305)
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define CHACHA20_POLY1305_AEAD_KEYSIZE 32
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#define CHACHA20_POLY1305_AEAD_IV_SIZE 12
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#define CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE 16
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enum {
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CHACHA20_POLY_1305_ENC_TYPE = 8, /* cipher unique type */
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/* AEAD Cipher Direction */
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CHACHA20_POLY1305_AEAD_DECRYPT = 0,
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CHACHA20_POLY1305_AEAD_ENCRYPT = 1,
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/* AEAD State */
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CHACHA20_POLY1305_STATE_INIT = 0,
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CHACHA20_POLY1305_STATE_READY = 1,
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CHACHA20_POLY1305_STATE_AAD = 2,
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CHACHA20_POLY1305_STATE_DATA = 3,
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};
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typedef struct ChaChaPoly_Aead {
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ChaCha chacha;
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Poly1305 poly;
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word32 aadLen;
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word32 dataLen;
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byte state;
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byte isEncrypt:1;
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} ChaChaPoly_Aead;
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/*
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* The IV for this implementation is 96 bits to give the most flexibility.
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*
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* Some protocols may have unique per-invocation inputs that are not
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* 96-bit in length. For example, IPsec may specify a 64-bit nonce. In
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* such a case, it is up to the protocol document to define how to
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* transform the protocol nonce into a 96-bit nonce, for example by
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* concatenating a constant value.
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*/
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WOLFSSL_API
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int wc_ChaCha20Poly1305_Encrypt(
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const byte inKey[CHACHA20_POLY1305_AEAD_KEYSIZE],
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const byte inIV[CHACHA20_POLY1305_AEAD_IV_SIZE],
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const byte* inAAD, const word32 inAADLen,
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const byte* inPlaintext, const word32 inPlaintextLen,
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byte* outCiphertext,
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byte outAuthTag[CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE]);
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WOLFSSL_API
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int wc_ChaCha20Poly1305_Decrypt(
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const byte inKey[CHACHA20_POLY1305_AEAD_KEYSIZE],
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const byte inIV[CHACHA20_POLY1305_AEAD_IV_SIZE],
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const byte* inAAD, const word32 inAADLen,
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const byte* inCiphertext, const word32 inCiphertextLen,
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const byte inAuthTag[CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE],
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byte* outPlaintext);
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WOLFSSL_API
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int wc_ChaCha20Poly1305_CheckTag(
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const byte authTag[CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE],
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const byte authTagChk[CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE]);
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/* Implementation of AEAD, which includes support for adding
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data, then final calculation of authentication tag */
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WOLFSSL_API int wc_ChaCha20Poly1305_Init(ChaChaPoly_Aead* aead,
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const byte inKey[CHACHA20_POLY1305_AEAD_KEYSIZE],
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const byte inIV[CHACHA20_POLY1305_AEAD_IV_SIZE],
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int isEncrypt);
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WOLFSSL_API int wc_ChaCha20Poly1305_UpdateAad(ChaChaPoly_Aead* aead,
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const byte* inAAD, word32 inAADLen);
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WOLFSSL_API int wc_ChaCha20Poly1305_UpdateData(ChaChaPoly_Aead* aead,
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const byte* inData, byte* outData, word32 dataLen);
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WOLFSSL_API int wc_ChaCha20Poly1305_Final(ChaChaPoly_Aead* aead,
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byte outAuthTag[CHACHA20_POLY1305_AEAD_AUTHTAG_SIZE]);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* HAVE_CHACHA && HAVE_POLY1305 */
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#endif /* WOLF_CRYPT_CHACHA20_POLY1305_H */
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