12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364 |
- /*
- * Copyright (c) 2015, Vsevolod Stakhov
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY AUTHOR ''AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- #include "config.h"
- #include "ottery-internal.h"
- #include "libcryptobox/chacha20/chacha.h"
-
- #define STATE_LEN (sizeof(chacha_state))
- #define STATE_BYTES 40
-
- #define IDX_STEP 16
- #define OUTPUT_LEN (IDX_STEP * 64)
-
- static void
- chacha20_cryptobox_state_setup (void *state_, const uint8_t *bytes)
- {
- chacha_state *x = state_;
- chacha_init (x, (chacha_key *)bytes, (chacha_iv *)(bytes + 32), 20);
- }
-
- static void
- chacha20_cryptobox_generate (void *state_, uint8_t *output, uint32_t idx)
- {
- chacha_state *x = state_;
-
- memset (output, 0, OUTPUT_LEN);
- memcpy (output, &idx, sizeof (idx));
- chacha_update (x, output, output, OUTPUT_LEN);
- }
-
- #define PRF_CHACHA(r) { \
- "CHACHA" #r "-CRYPTOBOX", \
- "CHACHA" #r "-CRYPTOBOX", \
- "CHACHA" #r "-CRYPTOBOX", \
- STATE_LEN, \
- STATE_BYTES, \
- OUTPUT_LEN, \
- 0, \
- chacha ## r ## _cryptobox_state_setup, \
- chacha ## r ## _cryptobox_generate \
- }
-
- const struct ottery_prf ottery_prf_chacha20_cryptobox_ = PRF_CHACHA(20);
|