Lucas Gabriel Vuotto
6677c6cab3
Now that HMAC isn't special anymore, and with the help of init params,
this isn't needed anymore as we only allocate memory for the state.
This effectively reverts e9bcc64e62 .
134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
/*
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* Copyright (c) 2024 Lucas Gabriel Vuotto <lucas@lgv5.net>
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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 <stdlib.h>
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#include "lilcrypto.h"
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#include "auth.h"
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#include "hash.h"
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#include "impl_hmac.h"
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#include "util.h"
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#define HMAC_IPAD UINT8_C(0x36)
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#define HMAC_OPAD UINT8_C(0x5c)
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static int
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hmac_init(void *arg, void *initparams)
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{
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struct hmac_ctx *ctx = arg;
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struct lc_hmac_params *params = initparams;
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uint8_t ikeypad[HMAC_BLOCKLEN_MAX];
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size_t i, olen, blen, keylen;
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ctx->hash = params->hash;
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keylen = params->keylen;
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blen = params->hash->impl->blocklen;
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if (keylen > blen) {
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if (!lc_hash(ctx->hash->impl, ctx->key, &olen, params->key,
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keylen))
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return 0;
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keylen = olen;
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} else
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for (i = 0; i < keylen; i++)
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ctx->key[i] = params->key[i];
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for (i = keylen; i < blen; i++)
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ctx->key[i] = 0;
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for (i = 0; i < blen; i++)
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ikeypad[i] = ctx->key[i] ^ HMAC_IPAD;
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return lc_hash_init(ctx->hash) &&
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lc_hash_update(ctx->hash, ikeypad, blen);
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}
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static int
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hmac_update(void *arg, const uint8_t *in, size_t inlen)
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{
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struct hmac_ctx *ctx = arg;
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return lc_hash_update(ctx->hash, in, inlen);
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}
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static int
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hmac_final(void *arg, uint8_t *out, size_t *outlen)
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{
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struct hmac_ctx *ctx = arg;
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uint8_t m[HMAC_BLOCKLEN_MAX], okeypad[HMAC_BLOCKLEN_MAX];
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size_t i, olen, blen;
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int rc;
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if (out == NULL) {
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*outlen = ctx->hash->impl->hashlen;
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return 1;
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}
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*outlen = 0;
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blen = ctx->hash->impl->blocklen;
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for (i = 0; i < blen; i++)
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okeypad[i] = ctx->key[i] ^ HMAC_OPAD;
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rc = lc_hash_final(ctx->hash, m, &olen) &&
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lc_hash_init(ctx->hash) &&
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lc_hash_update(ctx->hash, okeypad, blen) &&
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lc_hash_update(ctx->hash, m, olen) &&
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lc_hash_final(ctx->hash, out, outlen);
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lc_scrub(ctx, sizeof(*ctx));
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return rc;
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}
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static int
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hmac_auth(uint8_t *out, size_t *outlen, void *initparams, const uint8_t *in,
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size_t inlen)
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{
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struct lc_hmac_params *params = initparams;
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struct hmac_ctx ctx;
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if (out == NULL) {
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*outlen = params->hash->impl->hashlen;
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return 1;
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}
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return hmac_init(&ctx, initparams) &&
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hmac_update(&ctx, in, inlen) &&
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hmac_final(&ctx, out, outlen);
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}
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static struct lc_auth_impl hmac_impl = {
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.init = &hmac_init,
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.update = &hmac_update,
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.final = &hmac_final,
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.auth = &hmac_auth,
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.argsz = sizeof(struct hmac_ctx),
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.blocklen = 0,
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.taglen = 0,
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};
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const struct lc_auth_impl *
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lc_auth_impl_hmac(void)
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{
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return &hmac_impl;
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}
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