104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2015-2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#ifndef _WG_CRYPTO
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#define _WG_CRYPTO
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#include <sys/types.h>
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enum chacha20poly1305_lengths {
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XCHACHA20POLY1305_NONCE_SIZE = 24,
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CHACHA20POLY1305_KEY_SIZE = 32,
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CHACHA20POLY1305_AUTHTAG_SIZE = 16
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};
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void
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chacha20poly1305_encrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
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const uint8_t *ad, const size_t ad_len,
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const uint64_t nonce,
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const uint8_t key[CHACHA20POLY1305_KEY_SIZE]);
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bool
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chacha20poly1305_decrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
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const uint8_t *ad, const size_t ad_len,
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const uint64_t nonce,
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const uint8_t key[CHACHA20POLY1305_KEY_SIZE]);
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void
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xchacha20poly1305_encrypt(uint8_t *dst, const uint8_t *src,
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const size_t src_len, const uint8_t *ad,
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const size_t ad_len,
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const uint8_t nonce[XCHACHA20POLY1305_NONCE_SIZE],
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const uint8_t key[CHACHA20POLY1305_KEY_SIZE]);
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bool
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xchacha20poly1305_decrypt(uint8_t *dst, const uint8_t *src,
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const size_t src_len, const uint8_t *ad,
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const size_t ad_len,
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const uint8_t nonce[XCHACHA20POLY1305_NONCE_SIZE],
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const uint8_t key[CHACHA20POLY1305_KEY_SIZE]);
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enum blake2s_lengths {
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BLAKE2S_BLOCK_SIZE = 64,
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BLAKE2S_HASH_SIZE = 32,
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BLAKE2S_KEY_SIZE = 32
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};
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struct blake2s_state {
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uint32_t h[8];
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uint32_t t[2];
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uint32_t f[2];
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uint8_t buf[BLAKE2S_BLOCK_SIZE];
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unsigned int buflen;
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unsigned int outlen;
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};
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void blake2s_init(struct blake2s_state *state, const size_t outlen);
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void blake2s_init_key(struct blake2s_state *state, const size_t outlen,
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const uint8_t *key, const size_t keylen);
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void blake2s_update(struct blake2s_state *state, const uint8_t *in, size_t inlen);
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void blake2s_final(struct blake2s_state *state, uint8_t *out);
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void blake2s(uint8_t *out, const uint8_t *in, const uint8_t *key,
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const size_t outlen, const size_t inlen, const size_t keylen);
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void blake2s_hmac(uint8_t *out, const uint8_t *in, const uint8_t *key,
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const size_t outlen, const size_t inlen, const size_t keylen);
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enum curve25519_lengths {
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CURVE25519_KEY_SIZE = 32
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};
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bool curve25519(uint8_t mypublic[static CURVE25519_KEY_SIZE],
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const uint8_t secret[static CURVE25519_KEY_SIZE],
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const uint8_t basepoint[static CURVE25519_KEY_SIZE]);
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static inline bool
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curve25519_generate_public(uint8_t pub[static CURVE25519_KEY_SIZE],
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const uint8_t secret[static CURVE25519_KEY_SIZE])
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{
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static const uint8_t basepoint[CURVE25519_KEY_SIZE] = { 9 };
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return curve25519(pub, secret, basepoint);
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}
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static inline void curve25519_clamp_secret(uint8_t secret[static CURVE25519_KEY_SIZE])
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{
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secret[0] &= 248;
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secret[31] = (secret[31] & 127) | 64;
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}
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static inline void curve25519_generate_secret(uint8_t secret[CURVE25519_KEY_SIZE])
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{
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arc4random_buf(secret, CURVE25519_KEY_SIZE);
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curve25519_clamp_secret(secret);
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}
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#endif
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