159 lines
4.3 KiB
C
159 lines
4.3 KiB
C
/* $OpenBSD: prf.c,v 1.16 2013/03/21 04:30:14 deraadt Exp $ */
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/* $EOM: prf.c,v 1.7 1999/05/02 12:50:29 niklas Exp $ */
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/*
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* Copyright (c) 1998 Niels Provos. All rights reserved.
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* Copyright (c) 1999 Niklas Hallqvist. 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* 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
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This code was written under funding by Ericsson Radio Systems.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "hash.h"
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#include "log.h"
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#include "prf.h"
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void prf_hash_init(struct prf_hash_ctx *);
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void prf_hash_update(struct prf_hash_ctx *, unsigned char *, unsigned int);
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void prf_hash_final(unsigned char *, struct prf_hash_ctx *);
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/* PRF behaves likes a hash */
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void
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prf_hash_init(struct prf_hash_ctx *ctx)
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{
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memcpy(ctx->hash->ctx, ctx->ctx, ctx->hash->ctxsize);
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memcpy(ctx->hash->ctx2, ctx->ctx2, ctx->hash->ctxsize);
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}
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void
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prf_hash_update(struct prf_hash_ctx *ctx, unsigned char *data,
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unsigned int len)
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{
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ctx->hash->Update(ctx->hash->ctx, data, len);
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}
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void
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prf_hash_final(unsigned char *digest, struct prf_hash_ctx *ctx)
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{
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ctx->hash->HMACFinal(digest, ctx->hash);
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}
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/*
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* Obtain a Pseudo-Random Function for us. At the moment this is
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* the HMAC version of a hash. See RFC-2104 for reference.
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*/
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struct prf *
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prf_alloc(enum prfs type, int subtype, unsigned char *shared,
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unsigned int sharedsize)
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{
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struct hash *hash;
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struct prf *prf;
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struct prf_hash_ctx *prfctx;
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switch (type) {
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case PRF_HMAC:
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hash = hash_get(subtype);
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if (!hash) {
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log_print("prf_alloc: unknown hash type %d", subtype);
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return 0;
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}
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break;
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default:
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log_print("prf_alloc: unknown PRF type %d", type);
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return 0;
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}
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prf = malloc(sizeof *prf);
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if (!prf) {
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log_error("prf_alloc: malloc (%lu) failed",
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(unsigned long)sizeof *prf);
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return 0;
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}
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if (type == PRF_HMAC) {
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/* Obtain needed memory. */
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prfctx = malloc(sizeof *prfctx);
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if (!prfctx) {
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log_error("prf_alloc: malloc (%lu) failed",
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(unsigned long)sizeof *prfctx);
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goto cleanprf;
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}
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prf->prfctx = prfctx;
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prfctx->ctx = malloc(hash->ctxsize);
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if (!prfctx->ctx) {
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log_error("prf_alloc: malloc (%d) failed",
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hash->ctxsize);
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goto cleanprfctx;
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}
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prfctx->ctx2 = malloc(hash->ctxsize);
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if (!prfctx->ctx2) {
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log_error("prf_alloc: malloc (%d) failed",
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hash->ctxsize);
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free(prfctx->ctx);
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goto cleanprfctx;
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}
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prf->type = PRF_HMAC;
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prf->blocksize = hash->hashsize;
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prfctx->hash = hash;
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/* Use the correct function pointers. */
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prf->Init = (void(*)(void *))prf_hash_init;
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prf->Update = (void(*)(void *, unsigned char *,
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unsigned int))prf_hash_update;
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prf->Final = (void(*)(unsigned char *, void *))prf_hash_final;
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/* Init HMAC contexts. */
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hash->HMACInit(hash, shared, sharedsize);
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/* Save contexts. */
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memcpy(prfctx->ctx, hash->ctx, hash->ctxsize);
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memcpy(prfctx->ctx2, hash->ctx2, hash->ctxsize);
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}
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return prf;
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cleanprfctx:
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free(prf->prfctx);
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cleanprf:
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free(prf);
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return 0;
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}
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/* Deallocate the PRF pointed to by PRF. */
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void
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prf_free(struct prf *prf)
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{
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struct prf_hash_ctx *prfctx = prf->prfctx;
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if (prf->type == PRF_HMAC) {
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free(prfctx->ctx2);
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free(prfctx->ctx);
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}
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free(prf->prfctx);
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free(prf);
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}
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