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/*
* Copyright (C) 2015-2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _WG_CRYPTO
#define _WG_CRYPTO
#include <sys/types.h>
enum chacha20poly1305_lengths {
XCHACHA20POLY1305_NONCE_SIZE = 24,
CHACHA20POLY1305_KEY_SIZE = 32,
CHACHA20POLY1305_AUTHTAG_SIZE = 16
};
void
chacha20poly1305_encrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
const uint8_t *ad, const size_t ad_len,
const uint64_t nonce,
const uint8_t key[CHACHA20POLY1305_KEY_SIZE]);
bool
chacha20poly1305_decrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
const uint8_t *ad, const size_t ad_len,
const uint64_t nonce,
const uint8_t key[CHACHA20POLY1305_KEY_SIZE]);
void
xchacha20poly1305_encrypt(uint8_t *dst, const uint8_t *src,
const size_t src_len, const uint8_t *ad,
const size_t ad_len,
const uint8_t nonce[XCHACHA20POLY1305_NONCE_SIZE],
const uint8_t key[CHACHA20POLY1305_KEY_SIZE]);
bool
xchacha20poly1305_decrypt(uint8_t *dst, const uint8_t *src,
const size_t src_len, const uint8_t *ad,
const size_t ad_len,
const uint8_t nonce[XCHACHA20POLY1305_NONCE_SIZE],
const uint8_t key[CHACHA20POLY1305_KEY_SIZE]);
enum blake2s_lengths {
BLAKE2S_BLOCK_SIZE = 64,
BLAKE2S_HASH_SIZE = 32,
BLAKE2S_KEY_SIZE = 32
};
struct blake2s_state {
uint32_t h[8];
uint32_t t[2];
uint32_t f[2];
uint8_t buf[BLAKE2S_BLOCK_SIZE];
unsigned int buflen;
unsigned int outlen;
};
void blake2s_init(struct blake2s_state *state, const size_t outlen);
void blake2s_init_key(struct blake2s_state *state, const size_t outlen,
const uint8_t *key, const size_t keylen);
void blake2s_update(struct blake2s_state *state, const uint8_t *in, size_t inlen);
void blake2s_final(struct blake2s_state *state, uint8_t *out);
void blake2s(uint8_t *out, const uint8_t *in, const uint8_t *key,
const size_t outlen, const size_t inlen, const size_t keylen);
void blake2s_hmac(uint8_t *out, const uint8_t *in, const uint8_t *key,
const size_t outlen, const size_t inlen, const size_t keylen);
enum curve25519_lengths {
CURVE25519_KEY_SIZE = 32
};
bool curve25519(uint8_t mypublic[static CURVE25519_KEY_SIZE],
const uint8_t secret[static CURVE25519_KEY_SIZE],
const uint8_t basepoint[static CURVE25519_KEY_SIZE]);
static inline bool
curve25519_generate_public(uint8_t pub[static CURVE25519_KEY_SIZE],
const uint8_t secret[static CURVE25519_KEY_SIZE])
{
static const uint8_t basepoint[CURVE25519_KEY_SIZE] = { 9 };
return curve25519(pub, secret, basepoint);
}
static inline void curve25519_clamp_secret(uint8_t secret[static CURVE25519_KEY_SIZE])
{
secret[0] &= 248;
secret[31] = (secret[31] & 127) | 64;
}
static inline void curve25519_generate_secret(uint8_t secret[CURVE25519_KEY_SIZE])
{
arc4random_buf(secret, CURVE25519_KEY_SIZE);
curve25519_clamp_secret(secret);
}
#endif
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