зеркало из https://github.com/mozilla/pjs.git
302 строки
8.4 KiB
C
302 строки
8.4 KiB
C
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/*
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* desblapi.c
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*
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* core source file for DES-150 library
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* Implement DES Modes of Operation and Triple-DES.
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* Adapt DES-150 to blapi API.
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the DES-150 library.
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*
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* The Initial Developer of the Original Code is
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* Nelson B. Bolyard, nelsonb@iname.com.
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* Portions created by the Initial Developer are Copyright (C) 1990
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "des.h"
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#include <stddef.h>
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#include "secerr.h"
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#if defined(_X86_)
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/* Intel X86 CPUs do unaligned loads and stores without complaint. */
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#define COPY8B(to, from, ptr) \
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HALFPTR(to)[0] = HALFPTR(from)[0]; \
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HALFPTR(to)[1] = HALFPTR(from)[1];
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#elif defined(USE_MEMCPY)
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#define COPY8B(to, from, ptr) memcpy(to, from, 8)
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#else
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#define COPY8B(to, from, ptr) \
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if (((ptrdiff_t)(ptr) & 0x3) == 0) { \
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HALFPTR(to)[0] = HALFPTR(from)[0]; \
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HALFPTR(to)[1] = HALFPTR(from)[1]; \
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} else if (((ptrdiff_t)(ptr) & 0x1) == 0) { \
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SHORTPTR(to)[0] = SHORTPTR(from)[0]; \
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SHORTPTR(to)[1] = SHORTPTR(from)[1]; \
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SHORTPTR(to)[2] = SHORTPTR(from)[2]; \
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SHORTPTR(to)[3] = SHORTPTR(from)[3]; \
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} else { \
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BYTEPTR(to)[0] = BYTEPTR(from)[0]; \
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BYTEPTR(to)[1] = BYTEPTR(from)[1]; \
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BYTEPTR(to)[2] = BYTEPTR(from)[2]; \
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BYTEPTR(to)[3] = BYTEPTR(from)[3]; \
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BYTEPTR(to)[4] = BYTEPTR(from)[4]; \
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BYTEPTR(to)[5] = BYTEPTR(from)[5]; \
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BYTEPTR(to)[6] = BYTEPTR(from)[6]; \
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BYTEPTR(to)[7] = BYTEPTR(from)[7]; \
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}
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#endif
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#define COPY8BTOHALF(to, from) COPY8B(to, from, from)
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#define COPY8BFROMHALF(to, from) COPY8B(to, from, to)
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static void
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DES_ECB(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
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{
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while (len) {
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DES_Do1Block(cx->ks0, in, out);
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len -= 8;
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in += 8;
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out += 8;
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}
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}
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static void
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DES_EDE3_ECB(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
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{
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while (len) {
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DES_Do1Block(cx->ks0, in, out);
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len -= 8;
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in += 8;
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DES_Do1Block(cx->ks1, out, out);
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DES_Do1Block(cx->ks2, out, out);
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out += 8;
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}
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}
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static void
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DES_CBCEn(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
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{
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const BYTE * bufend = in + len;
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HALF vec[2];
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while (in != bufend) {
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COPY8BTOHALF(vec, in);
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in += 8;
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vec[0] ^= cx->iv[0];
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vec[1] ^= cx->iv[1];
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DES_Do1Block( cx->ks0, (BYTE *)vec, (BYTE *)cx->iv);
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COPY8BFROMHALF(out, cx->iv);
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out += 8;
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}
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}
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static void
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DES_CBCDe(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
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{
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const BYTE * bufend;
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HALF oldciphertext[2];
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HALF plaintext [2];
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for (bufend = in + len; in != bufend; ) {
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oldciphertext[0] = cx->iv[0];
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oldciphertext[1] = cx->iv[1];
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COPY8BTOHALF(cx->iv, in);
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in += 8;
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DES_Do1Block(cx->ks0, (BYTE *)cx->iv, (BYTE *)plaintext);
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plaintext[0] ^= oldciphertext[0];
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plaintext[1] ^= oldciphertext[1];
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COPY8BFROMHALF(out, plaintext);
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out += 8;
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}
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}
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static void
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DES_EDE3CBCEn(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
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{
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const BYTE * bufend = in + len;
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HALF vec[2];
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while (in != bufend) {
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COPY8BTOHALF(vec, in);
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in += 8;
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vec[0] ^= cx->iv[0];
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vec[1] ^= cx->iv[1];
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DES_Do1Block( cx->ks0, (BYTE *)vec, (BYTE *)cx->iv);
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DES_Do1Block( cx->ks1, (BYTE *)cx->iv, (BYTE *)cx->iv);
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DES_Do1Block( cx->ks2, (BYTE *)cx->iv, (BYTE *)cx->iv);
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COPY8BFROMHALF(out, cx->iv);
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out += 8;
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}
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}
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static void
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DES_EDE3CBCDe(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
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{
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const BYTE * bufend;
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HALF oldciphertext[2];
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HALF plaintext [2];
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for (bufend = in + len; in != bufend; ) {
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oldciphertext[0] = cx->iv[0];
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oldciphertext[1] = cx->iv[1];
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COPY8BTOHALF(cx->iv, in);
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in += 8;
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DES_Do1Block(cx->ks0, (BYTE *)cx->iv, (BYTE *)plaintext);
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DES_Do1Block(cx->ks1, (BYTE *)plaintext, (BYTE *)plaintext);
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DES_Do1Block(cx->ks2, (BYTE *)plaintext, (BYTE *)plaintext);
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plaintext[0] ^= oldciphertext[0];
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plaintext[1] ^= oldciphertext[1];
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COPY8BFROMHALF(out, plaintext);
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out += 8;
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}
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}
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DESContext *
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DES_AllocateContext(void)
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{
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return PORT_ZNew(DESContext);
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}
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SECStatus
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DES_InitContext(DESContext *cx, const unsigned char *key, unsigned int keylen,
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const unsigned char *iv, int mode, unsigned int encrypt,
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unsigned int unused)
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{
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DESDirection opposite;
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if (!cx) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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cx->direction = encrypt ? DES_ENCRYPT : DES_DECRYPT;
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opposite = encrypt ? DES_DECRYPT : DES_ENCRYPT;
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switch (mode) {
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case NSS_DES: /* DES ECB */
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DES_MakeSchedule( cx->ks0, key, cx->direction);
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cx->worker = &DES_ECB;
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break;
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case NSS_DES_EDE3: /* DES EDE ECB */
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cx->worker = &DES_EDE3_ECB;
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if (encrypt) {
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DES_MakeSchedule(cx->ks0, key, cx->direction);
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DES_MakeSchedule(cx->ks1, key + 8, opposite);
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DES_MakeSchedule(cx->ks2, key + 16, cx->direction);
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} else {
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DES_MakeSchedule(cx->ks2, key, cx->direction);
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DES_MakeSchedule(cx->ks1, key + 8, opposite);
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DES_MakeSchedule(cx->ks0, key + 16, cx->direction);
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}
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break;
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case NSS_DES_CBC: /* DES CBC */
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COPY8BTOHALF(cx->iv, iv);
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cx->worker = encrypt ? &DES_CBCEn : &DES_CBCDe;
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DES_MakeSchedule(cx->ks0, key, cx->direction);
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break;
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case NSS_DES_EDE3_CBC: /* DES EDE CBC */
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COPY8BTOHALF(cx->iv, iv);
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if (encrypt) {
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cx->worker = &DES_EDE3CBCEn;
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DES_MakeSchedule(cx->ks0, key, cx->direction);
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DES_MakeSchedule(cx->ks1, key + 8, opposite);
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DES_MakeSchedule(cx->ks2, key + 16, cx->direction);
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} else {
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cx->worker = &DES_EDE3CBCDe;
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DES_MakeSchedule(cx->ks2, key, cx->direction);
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DES_MakeSchedule(cx->ks1, key + 8, opposite);
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DES_MakeSchedule(cx->ks0, key + 16, cx->direction);
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}
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break;
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default:
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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return SECSuccess;
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}
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DESContext *
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DES_CreateContext(const BYTE * key, const BYTE *iv, int mode, PRBool encrypt)
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{
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DESContext *cx = PORT_ZNew(DESContext);
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SECStatus rv = DES_InitContext(cx, key, 0, iv, mode, encrypt, 0);
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if (rv != SECSuccess) {
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PORT_ZFree(cx, sizeof *cx);
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cx = NULL;
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}
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return cx;
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}
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void
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DES_DestroyContext(DESContext *cx, PRBool freeit)
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{
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if (cx) {
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memset(cx, 0, sizeof *cx);
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if (freeit)
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PORT_Free(cx);
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}
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}
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SECStatus
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DES_Encrypt(DESContext *cx, BYTE *out, unsigned int *outLen,
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unsigned int maxOutLen, const BYTE *in, unsigned int inLen)
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{
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if (inLen < 0 || (inLen % 8) != 0 || maxOutLen < inLen || !cx ||
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cx->direction != DES_ENCRYPT) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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cx->worker(cx, out, in, inLen);
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if (outLen)
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*outLen = inLen;
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return SECSuccess;
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}
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SECStatus
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DES_Decrypt(DESContext *cx, BYTE *out, unsigned int *outLen,
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unsigned int maxOutLen, const BYTE *in, unsigned int inLen)
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{
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if (inLen < 0 || (inLen % 8) != 0 || maxOutLen < inLen || !cx ||
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cx->direction != DES_DECRYPT) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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cx->worker(cx, out, in, inLen);
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if (outLen)
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*outLen = inLen;
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return SECSuccess;
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}
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