88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
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/* $OpenBSD: chacha.c,v 1.8 2019/01/22 00:59:21 dlg Exp $ */
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/*
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* Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdint.h>
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#include <openssl/chacha.h>
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#include "chacha-merged.c"
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void
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ChaCha_set_key(ChaCha_ctx *ctx, const unsigned char *key, uint32_t keybits)
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{
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chacha_keysetup((chacha_ctx *)ctx, key, keybits);
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ctx->unused = 0;
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}
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void
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ChaCha_set_iv(ChaCha_ctx *ctx, const unsigned char *iv,
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const unsigned char *counter)
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{
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chacha_ivsetup((chacha_ctx *)ctx, iv, counter);
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ctx->unused = 0;
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}
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void
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ChaCha(ChaCha_ctx *ctx, unsigned char *out, const unsigned char *in, size_t len)
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{
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unsigned char *k;
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int i, l;
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/* Consume remaining keystream, if any exists. */
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if (ctx->unused > 0) {
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k = ctx->ks + 64 - ctx->unused;
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l = (len > ctx->unused) ? ctx->unused : len;
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for (i = 0; i < l; i++)
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*(out++) = *(in++) ^ *(k++);
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ctx->unused -= l;
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len -= l;
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}
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chacha_encrypt_bytes((chacha_ctx *)ctx, in, out, (uint32_t)len);
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}
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void
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CRYPTO_chacha_20(unsigned char *out, const unsigned char *in, size_t len,
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const unsigned char key[32], const unsigned char iv[8], uint64_t counter)
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{
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struct chacha_ctx ctx;
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/*
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* chacha_ivsetup expects the counter to be in u8. Rather than
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* converting size_t to u8 and then back again, pass a counter of
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* NULL and manually assign it afterwards.
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*/
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chacha_keysetup(&ctx, key, 256);
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chacha_ivsetup(&ctx, iv, NULL);
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if (counter != 0) {
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ctx.input[12] = (uint32_t)counter;
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ctx.input[13] = (uint32_t)(counter >> 32);
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}
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chacha_encrypt_bytes(&ctx, in, out, (uint32_t)len);
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}
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void
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CRYPTO_xchacha_20(unsigned char *out, const unsigned char *in, size_t len,
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const unsigned char key[32], const unsigned char iv[24])
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{
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uint8_t subkey[32];
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CRYPTO_hchacha_20(subkey, key, iv);
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CRYPTO_chacha_20(out, in, len, subkey, iv + 16, 0);
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}
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