mirror of
https://github.com/cryb-to/cryb-to.git
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340b3240cf
and MACs, and uint8_t, uint32_t or uint64_t (as appropriate) for internal state. Also remove a few unnecessary casts.
108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
/*-
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* Copyright (c) 2012 The University of Oslo
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* Copyright (c) 2012 Dag-Erling Smørgrav
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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
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* are met:
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* 1. 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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* 2. 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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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Author: Dag-Erling Smørgrav <des@des.no>
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* Sponsor: the University of Oslo
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*
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* $Cryb$
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*/
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#include "cryb/impl.h"
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#ifdef HAVE_SYS_ENDIAN_H
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#include <sys/endian.h>
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#endif
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#ifdef HAVE_ENDIAN_H
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#define _BSD_SOURCE
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#include <endian.h>
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#endif
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#include <stdint.h>
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#include <string.h>
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#include <cryb/hmac_sha256.h>
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void
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hmac_sha256_init(hmac_sha256_ctx *ctx, const void *key, size_t keylen)
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{
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uint8_t keybuf[SHA256_BLOCK_LEN], pad[SHA256_BLOCK_LEN];
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/* prepare key */
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memset(keybuf, 0, sizeof keybuf);
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if (keylen > sizeof keybuf)
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sha256_complete(key, keylen, keybuf);
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else
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memcpy(keybuf, key, keylen);
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/* input pad */
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for (unsigned int i = 0; i < sizeof pad; ++i)
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pad[i] = 0x36 ^ keybuf[i];
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sha256_init(&ctx->ictx);
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sha256_update(&ctx->ictx, pad, sizeof pad);
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/* output pad */
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for (unsigned int i = 0; i < sizeof pad; ++i)
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pad[i] = 0x5c ^ keybuf[i];
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sha256_init(&ctx->octx);
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sha256_update(&ctx->octx, pad, sizeof pad);
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/* hide the evidence */
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memset(keybuf, 0, sizeof keybuf);
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memset(pad, 0, sizeof pad);
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}
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void
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hmac_sha256_update(hmac_sha256_ctx *ctx, const void *buf, size_t len)
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{
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sha256_update(&ctx->ictx, buf, len);
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}
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void
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hmac_sha256_final(hmac_sha256_ctx *ctx, uint8_t *mac)
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{
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uint8_t digest[SHA256_DIGEST_LEN];
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sha256_final(&ctx->ictx, digest);
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sha256_update(&ctx->octx, digest, sizeof digest);
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sha256_final(&ctx->octx, mac);
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memset(ctx, 0, sizeof *ctx);
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}
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void
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hmac_sha256_complete(const void *key, size_t keylen,
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const void *buf, size_t len, uint8_t *mac)
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{
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hmac_sha256_ctx ctx;
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hmac_sha256_init(&ctx, key, keylen);
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hmac_sha256_update(&ctx, buf, len);
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hmac_sha256_final(&ctx, mac);
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}
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