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Diffstat (limited to 'sys/crypto/curve25519.h')
| -rw-r--r-- | sys/crypto/curve25519.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/sys/crypto/curve25519.h b/sys/crypto/curve25519.h new file mode 100644 index 00000000000..416d51225b4 --- /dev/null +++ b/sys/crypto/curve25519.h @@ -0,0 +1,43 @@ +/* + * Copyright (C) 2019-2020 Matt Dunwoodie <ncon@noconroy.net> + * + * 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 _CURVE25519_H_ +#define _CURVE25519_H_ + +#define CURVE25519_KEY_SIZE 32 + +int curve25519(uint8_t out[CURVE25519_KEY_SIZE], + const uint8_t scalar[CURVE25519_KEY_SIZE], + const uint8_t point[CURVE25519_KEY_SIZE]); + +int curve25519_generate_public(uint8_t pub[CURVE25519_KEY_SIZE], + const uint8_t secret[CURVE25519_KEY_SIZE]); + +static inline void +curve25519_clamp_secret(uint8_t secret[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 /* _CURVE25519_H_ */ |