GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: sbin/isakmpd/prf.c Lines: 0 50 0.0 %
Date: 2017-11-07 Branches: 0 16 0.0 %

Line Branch Exec Source
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/* $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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}