b54c312497
2 known bugs: . Build doesn't copy libssh* to the destination directory. + workaround is to copy them from the lib directory to destination and recreate links . ssh_config and sshd_config don't install + workaround is to copy them manually Note the software doesn't build to completion until you do the workarounds. Still trying to sort this out, but wanted to get these changes up for more visibility and collaboration.
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/* $OpenBSD: cipher-aesctr.c,v 1.2 2015/01/14 10:24:42 markus Exp $ */
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/*
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* Copyright (c) 2003 Markus Friedl. All rights reserved.
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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 "includes.h"
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#include <sys/types.h>
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#include <string.h>
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#ifndef WITH_OPENSSL
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#include "cipher-aesctr.h"
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/*
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* increment counter 'ctr',
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* the counter is of size 'len' bytes and stored in network-byte-order.
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* (LSB at ctr[len-1], MSB at ctr[0])
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*/
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static inline void
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aesctr_inc(u8 *ctr, u32 len)
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{
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ssize_t i;
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#ifndef CONSTANT_TIME_INCREMENT
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for (i = len - 1; i >= 0; i--)
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if (++ctr[i]) /* continue on overflow */
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return;
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#else
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u8 x, add = 1;
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for (i = len - 1; i >= 0; i--) {
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ctr[i] += add;
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/* constant time for: x = ctr[i] ? 1 : 0 */
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x = ctr[i];
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x = (x | (x >> 4)) & 0xf;
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x = (x | (x >> 2)) & 0x3;
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x = (x | (x >> 1)) & 0x1;
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add *= (x^1);
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}
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#endif
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}
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void
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aesctr_keysetup(aesctr_ctx *x,const u8 *k,u32 kbits,u32 ivbits)
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{
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x->rounds = rijndaelKeySetupEnc(x->ek, k, kbits);
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}
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void
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aesctr_ivsetup(aesctr_ctx *x,const u8 *iv)
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{
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memcpy(x->ctr, iv, AES_BLOCK_SIZE);
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}
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void
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aesctr_encrypt_bytes(aesctr_ctx *x,const u8 *m,u8 *c,u32 bytes)
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{
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u32 n = 0;
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u8 buf[AES_BLOCK_SIZE];
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while ((bytes--) > 0) {
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if (n == 0) {
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rijndaelEncrypt(x->ek, x->rounds, x->ctr, buf);
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aesctr_inc(x->ctr, AES_BLOCK_SIZE);
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}
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*(c++) = *(m++) ^ buf[n];
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n = (n + 1) % AES_BLOCK_SIZE;
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}
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}
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#endif /* !WITH_OPENSSL */
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