091d81d134
a consistent interface to h/w and s/w crypto algorithms for use by the kernel and (for h/w at least) by user-mode apps. Access for user-level code is through a /dev/crypto device that'll eventually be used by openssl to (potentially) accelerate many applications. Coming soon is an IPsec that makes use of this service to accelerate ESP, AH, and IPCOMP protocols. Included here is the "core" crypto support, /dev/crypto driver, various crypto algorithms that are not already present in the KAME crypto area, and support routines used by crypto device drivers. Obtained from: openbsd
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* $FreeBSD$ */
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/* $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason Exp $ */
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/*
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* Copyright (c) 1999 Theo de Raadt
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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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*
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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 products
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* derived from this software without specific prior written permission.
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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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/uio.h>
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#include <opencrypto/cryptodev.h>
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void
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cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
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{
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struct iovec *iov = uio->uio_iov;
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int iol = uio->uio_iovcnt;
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unsigned count;
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if (off < 0)
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panic("cuio_copydata: off %d < 0", off);
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if (len < 0)
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panic("cuio_copydata: len %d < 0", len);
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while (off > 0) {
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if (iol == 0)
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panic("iov_copydata: empty in skip");
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if (off < iov->iov_len)
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break;
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off -= iov->iov_len;
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iol--;
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iov++;
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}
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while (len > 0) {
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if (iol == 0)
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panic("cuio_copydata: empty");
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count = min(iov->iov_len - off, len);
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bcopy(((caddr_t)iov->iov_base) + off, cp, count);
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len -= count;
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cp += count;
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off = 0;
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iol--;
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iov++;
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}
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}
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void
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cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
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{
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struct iovec *iov = uio->uio_iov;
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int iol = uio->uio_iovcnt;
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unsigned count;
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if (off < 0)
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panic("cuio_copyback: off %d < 0", off);
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if (len < 0)
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panic("cuio_copyback: len %d < 0", len);
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while (off > 0) {
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if (iol == 0)
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panic("cuio_copyback: empty in skip");
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if (off < iov->iov_len)
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break;
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off -= iov->iov_len;
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iol--;
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iov++;
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}
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while (len > 0) {
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if (iol == 0)
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panic("uio_copyback: empty");
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count = min(iov->iov_len - off, len);
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bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
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len -= count;
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cp += count;
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off = 0;
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iol--;
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iov++;
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}
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}
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/*
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* Return a pointer to iov/offset of location in iovec list.
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*/
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struct iovec *
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cuio_getptr(struct uio *uio, int loc, int *off)
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{
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struct iovec *iov = uio->uio_iov;
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int iol = uio->uio_iovcnt;
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while (loc >= 0) {
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/* Normal end of search */
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if (loc < iov->iov_len) {
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*off = loc;
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return (iov);
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}
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loc -= iov->iov_len;
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if (iol == 0) {
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if (loc == 0) {
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/* Point at the end of valid data */
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*off = iov->iov_len;
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return (iov);
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} else
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return (NULL);
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} else {
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iov++, iol--;
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}
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}
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return (NULL);
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}
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