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/*
* desblapi.c
*
* core source file for DES-150 library
* Implement DES Modes of Operation and Triple-DES.
* Adapt DES-150 to blapi API.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif
#include "des.h"
#include <stddef.h>
#include "secerr.h"
#if defined(NSS_X86_OR_X64)
/* Intel X86 CPUs do unaligned loads and stores without complaint. */
#define COPY8B(to, from, ptr) \
HALFPTR(to)[0] = HALFPTR(from)[0]; \
HALFPTR(to)[1] = HALFPTR(from)[1];
#else
#define COPY8B(to, from, ptr) memcpy(to, from, 8)
#endif
#define COPY8BTOHALF(to, from) COPY8B(to, from, from)
#define COPY8BFROMHALF(to, from) COPY8B(to, from, to)
static void
DES_ECB(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
while (len) {
DES_Do1Block(cx->ks0, in, out);
len -= 8;
in += 8;
out += 8;
}
}
static void
DES_EDE3_ECB(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
while (len) {
DES_Do1Block(cx->ks0, in, out);
len -= 8;
in += 8;
DES_Do1Block(cx->ks1, out, out);
DES_Do1Block(cx->ks2, out, out);
out += 8;
}
}
static void
DES_CBCEn(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
const BYTE * bufend = in + len;
HALF vec[2];
while (in != bufend) {
COPY8BTOHALF(vec, in);
in += 8;
vec[0] ^= cx->iv[0];
vec[1] ^= cx->iv[1];
DES_Do1Block( cx->ks0, (BYTE *)vec, (BYTE *)cx->iv);
COPY8BFROMHALF(out, cx->iv);
out += 8;
}
}
static void
DES_CBCDe(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
const BYTE * bufend;
HALF oldciphertext[2];
HALF plaintext [2];
for (bufend = in + len; in != bufend; ) {
oldciphertext[0] = cx->iv[0];
oldciphertext[1] = cx->iv[1];
COPY8BTOHALF(cx->iv, in);
in += 8;
DES_Do1Block(cx->ks0, (BYTE *)cx->iv, (BYTE *)plaintext);
plaintext[0] ^= oldciphertext[0];
plaintext[1] ^= oldciphertext[1];
COPY8BFROMHALF(out, plaintext);
out += 8;
}
}
static void
DES_EDE3CBCEn(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
const BYTE * bufend = in + len;
HALF vec[2];
while (in != bufend) {
COPY8BTOHALF(vec, in);
in += 8;
vec[0] ^= cx->iv[0];
vec[1] ^= cx->iv[1];
DES_Do1Block( cx->ks0, (BYTE *)vec, (BYTE *)cx->iv);
DES_Do1Block( cx->ks1, (BYTE *)cx->iv, (BYTE *)cx->iv);
DES_Do1Block( cx->ks2, (BYTE *)cx->iv, (BYTE *)cx->iv);
COPY8BFROMHALF(out, cx->iv);
out += 8;
}
}
static void
DES_EDE3CBCDe(DESContext *cx, BYTE *out, const BYTE *in, unsigned int len)
{
const BYTE * bufend;
HALF oldciphertext[2];
HALF plaintext [2];
for (bufend = in + len; in != bufend; ) {
oldciphertext[0] = cx->iv[0];
oldciphertext[1] = cx->iv[1];
COPY8BTOHALF(cx->iv, in);
in += 8;
DES_Do1Block(cx->ks0, (BYTE *)cx->iv, (BYTE *)plaintext);
DES_Do1Block(cx->ks1, (BYTE *)plaintext, (BYTE *)plaintext);
DES_Do1Block(cx->ks2, (BYTE *)plaintext, (BYTE *)plaintext);
plaintext[0] ^= oldciphertext[0];
plaintext[1] ^= oldciphertext[1];
COPY8BFROMHALF(out, plaintext);
out += 8;
}
}
DESContext *
DES_AllocateContext(void)
{
return PORT_ZNew(DESContext);
}
SECStatus
DES_InitContext(DESContext *cx, const unsigned char *key, unsigned int keylen,
const unsigned char *iv, int mode, unsigned int encrypt,
unsigned int unused)
{
DESDirection opposite;
if (!cx) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
cx->direction = encrypt ? DES_ENCRYPT : DES_DECRYPT;
opposite = encrypt ? DES_DECRYPT : DES_ENCRYPT;
switch (mode) {
case NSS_DES: /* DES ECB */
DES_MakeSchedule( cx->ks0, key, cx->direction);
cx->worker = &DES_ECB;
break;
case NSS_DES_EDE3: /* DES EDE ECB */
cx->worker = &DES_EDE3_ECB;
if (encrypt) {
DES_MakeSchedule(cx->ks0, key, cx->direction);
DES_MakeSchedule(cx->ks1, key + 8, opposite);
DES_MakeSchedule(cx->ks2, key + 16, cx->direction);
} else {
DES_MakeSchedule(cx->ks2, key, cx->direction);
DES_MakeSchedule(cx->ks1, key + 8, opposite);
DES_MakeSchedule(cx->ks0, key + 16, cx->direction);
}
break;
case NSS_DES_CBC: /* DES CBC */
COPY8BTOHALF(cx->iv, iv);
cx->worker = encrypt ? &DES_CBCEn : &DES_CBCDe;
DES_MakeSchedule(cx->ks0, key, cx->direction);
break;
case NSS_DES_EDE3_CBC: /* DES EDE CBC */
COPY8BTOHALF(cx->iv, iv);
if (encrypt) {
cx->worker = &DES_EDE3CBCEn;
DES_MakeSchedule(cx->ks0, key, cx->direction);
DES_MakeSchedule(cx->ks1, key + 8, opposite);
DES_MakeSchedule(cx->ks2, key + 16, cx->direction);
} else {
cx->worker = &DES_EDE3CBCDe;
DES_MakeSchedule(cx->ks2, key, cx->direction);
DES_MakeSchedule(cx->ks1, key + 8, opposite);
DES_MakeSchedule(cx->ks0, key + 16, cx->direction);
}
break;
default:
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
return SECSuccess;
}
DESContext *
DES_CreateContext(const BYTE * key, const BYTE *iv, int mode, PRBool encrypt)
{
DESContext *cx = PORT_ZNew(DESContext);
SECStatus rv = DES_InitContext(cx, key, 0, iv, mode, encrypt, 0);
if (rv != SECSuccess) {
PORT_ZFree(cx, sizeof *cx);
cx = NULL;
}
return cx;
}
void
DES_DestroyContext(DESContext *cx, PRBool freeit)
{
if (cx) {
memset(cx, 0, sizeof *cx);
if (freeit)
PORT_Free(cx);
}
}
SECStatus
DES_Encrypt(DESContext *cx, BYTE *out, unsigned int *outLen,
unsigned int maxOutLen, const BYTE *in, unsigned int inLen)
{
if ((inLen % 8) != 0 || maxOutLen < inLen || !cx ||
cx->direction != DES_ENCRYPT) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
cx->worker(cx, out, in, inLen);
if (outLen)
*outLen = inLen;
return SECSuccess;
}
SECStatus
DES_Decrypt(DESContext *cx, BYTE *out, unsigned int *outLen,
unsigned int maxOutLen, const BYTE *in, unsigned int inLen)
{
if ((inLen % 8) != 0 || maxOutLen < inLen || !cx ||
cx->direction != DES_DECRYPT) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
cx->worker(cx, out, in, inLen);
if (outLen)
*outLen = inLen;
return SECSuccess;
}
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