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