gecko/security/nss/lib/freebl/alg2268.c

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2008-06-06 05:40:11 -07:00
/*
* alg2268.c - implementation of the algorithm in RFC 2268
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* $Id: alg2268.c,v 1.9 2009/04/09 22:11:07 julien.pierre.boogz%sun.com Exp $ */
#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif
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#include "blapi.h"
#include "secerr.h"
#ifdef XP_UNIX_XXX
#include <stddef.h> /* for ptrdiff_t */
#endif
/*
** RC2 symmetric block cypher
*/
typedef SECStatus (rc2Func)(RC2Context *cx, unsigned char *output,
const unsigned char *input, unsigned int inputLen);
/* forward declarations */
static rc2Func rc2_EncryptECB;
static rc2Func rc2_DecryptECB;
static rc2Func rc2_EncryptCBC;
static rc2Func rc2_DecryptCBC;
typedef union {
PRUint32 l[2];
PRUint16 s[4];
PRUint8 b[8];
} RC2Block;
struct RC2ContextStr {
union {
PRUint8 Kb[128];
PRUint16 Kw[64];
} u;
RC2Block iv;
rc2Func *enc;
rc2Func *dec;
};
#define B u.Kb
#define K u.Kw
#define BYTESWAP(x) ((x) << 8 | (x) >> 8)
#define SWAPK(i) cx->K[i] = (tmpS = cx->K[i], BYTESWAP(tmpS))
#define RC2_BLOCK_SIZE 8
#define LOAD_HARD(R) \
R[0] = (PRUint16)input[1] << 8 | input[0]; \
R[1] = (PRUint16)input[3] << 8 | input[2]; \
R[2] = (PRUint16)input[5] << 8 | input[4]; \
R[3] = (PRUint16)input[7] << 8 | input[6];
#define LOAD_EASY(R) \
R[0] = ((PRUint16 *)input)[0]; \
R[1] = ((PRUint16 *)input)[1]; \
R[2] = ((PRUint16 *)input)[2]; \
R[3] = ((PRUint16 *)input)[3];
#define STORE_HARD(R) \
output[0] = (PRUint8)(R[0]); output[1] = (PRUint8)(R[0] >> 8); \
output[2] = (PRUint8)(R[1]); output[3] = (PRUint8)(R[1] >> 8); \
output[4] = (PRUint8)(R[2]); output[5] = (PRUint8)(R[2] >> 8); \
output[6] = (PRUint8)(R[3]); output[7] = (PRUint8)(R[3] >> 8);
#define STORE_EASY(R) \
((PRUint16 *)output)[0] = R[0]; \
((PRUint16 *)output)[1] = R[1]; \
((PRUint16 *)output)[2] = R[2]; \
((PRUint16 *)output)[3] = R[3];
#if defined (NSS_X86_OR_X64)
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#define LOAD(R) LOAD_EASY(R)
#define STORE(R) STORE_EASY(R)
#elif !defined(IS_LITTLE_ENDIAN)
#define LOAD(R) LOAD_HARD(R)
#define STORE(R) STORE_HARD(R)
#else
#define LOAD(R) if ((ptrdiff_t)input & 1) { LOAD_HARD(R) } else { LOAD_EASY(R) }
#define STORE(R) if ((ptrdiff_t)input & 1) { STORE_HARD(R) } else { STORE_EASY(R) }
#endif
static const PRUint8 S[256] = {
0331,0170,0371,0304,0031,0335,0265,0355,0050,0351,0375,0171,0112,0240,0330,0235,
0306,0176,0067,0203,0053,0166,0123,0216,0142,0114,0144,0210,0104,0213,0373,0242,
0027,0232,0131,0365,0207,0263,0117,0023,0141,0105,0155,0215,0011,0201,0175,0062,
0275,0217,0100,0353,0206,0267,0173,0013,0360,0225,0041,0042,0134,0153,0116,0202,
0124,0326,0145,0223,0316,0140,0262,0034,0163,0126,0300,0024,0247,0214,0361,0334,
0022,0165,0312,0037,0073,0276,0344,0321,0102,0075,0324,0060,0243,0074,0266,0046,
0157,0277,0016,0332,0106,0151,0007,0127,0047,0362,0035,0233,0274,0224,0103,0003,
0370,0021,0307,0366,0220,0357,0076,0347,0006,0303,0325,0057,0310,0146,0036,0327,
0010,0350,0352,0336,0200,0122,0356,0367,0204,0252,0162,0254,0065,0115,0152,0052,
0226,0032,0322,0161,0132,0025,0111,0164,0113,0237,0320,0136,0004,0030,0244,0354,
0302,0340,0101,0156,0017,0121,0313,0314,0044,0221,0257,0120,0241,0364,0160,0071,
0231,0174,0072,0205,0043,0270,0264,0172,0374,0002,0066,0133,0045,0125,0227,0061,
0055,0135,0372,0230,0343,0212,0222,0256,0005,0337,0051,0020,0147,0154,0272,0311,
0323,0000,0346,0317,0341,0236,0250,0054,0143,0026,0001,0077,0130,0342,0211,0251,
0015,0070,0064,0033,0253,0063,0377,0260,0273,0110,0014,0137,0271,0261,0315,0056,
0305,0363,0333,0107,0345,0245,0234,0167,0012,0246,0040,0150,0376,0177,0301,0255
};
RC2Context * RC2_AllocateContext(void)
{
return PORT_ZNew(RC2Context);
}
SECStatus
RC2_InitContext(RC2Context *cx, const unsigned char *key, unsigned int len,
const unsigned char *input, int mode, unsigned int efLen8,
unsigned int unused)
{
PRUint8 *L,*L2;
int i;
#if !defined(IS_LITTLE_ENDIAN)
PRUint16 tmpS;
#endif
PRUint8 tmpB;
if (!key || !cx || !len || len > (sizeof cx->B) ||
efLen8 > (sizeof cx->B)) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
if (mode == NSS_RC2) {
/* groovy */
} else if (mode == NSS_RC2_CBC) {
if (!input) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
} else {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
if (mode == NSS_RC2_CBC) {
cx->enc = & rc2_EncryptCBC;
cx->dec = & rc2_DecryptCBC;
LOAD(cx->iv.s);
} else {
cx->enc = & rc2_EncryptECB;
cx->dec = & rc2_DecryptECB;
}
/* Step 0. Copy key into table. */
memcpy(cx->B, key, len);
/* Step 1. Compute all values to the right of the key. */
L2 = cx->B;
L = L2 + len;
tmpB = L[-1];
for (i = (sizeof cx->B) - len; i > 0; --i) {
*L++ = tmpB = S[ (PRUint8)(tmpB + *L2++) ];
}
/* step 2. Adjust left most byte of effective key. */
i = (sizeof cx->B) - efLen8;
L = cx->B + i;
*L = tmpB = S[*L]; /* mask is always 0xff */
/* step 3. Recompute all values to the left of effective key. */
L2 = --L + efLen8;
while(L >= cx->B) {
*L-- = tmpB = S[ tmpB ^ *L2-- ];
}
#if !defined(IS_LITTLE_ENDIAN)
for (i = 63; i >= 0; --i) {
SWAPK(i); /* candidate for unrolling */
}
#endif
return SECSuccess;
}
/*
** Create a new RC2 context suitable for RC2 encryption/decryption.
** "key" raw key data
** "len" the number of bytes of key data
** "iv" is the CBC initialization vector (if mode is NSS_RC2_CBC)
** "mode" one of NSS_RC2 or NSS_RC2_CBC
** "effectiveKeyLen" in bytes, not bits.
**
** When mode is set to NSS_RC2_CBC the RC2 cipher is run in "cipher block
** chaining" mode.
*/
RC2Context *
RC2_CreateContext(const unsigned char *key, unsigned int len,
const unsigned char *iv, int mode, unsigned efLen8)
{
RC2Context *cx = PORT_ZNew(RC2Context);
if (cx) {
SECStatus rv = RC2_InitContext(cx, key, len, iv, mode, efLen8, 0);
if (rv != SECSuccess) {
RC2_DestroyContext(cx, PR_TRUE);
cx = NULL;
}
}
return cx;
}
/*
** Destroy an RC2 encryption/decryption context.
** "cx" the context
** "freeit" if PR_TRUE then free the object as well as its sub-objects
*/
void
RC2_DestroyContext(RC2Context *cx, PRBool freeit)
{
if (cx) {
memset(cx, 0, sizeof *cx);
if (freeit) {
PORT_Free(cx);
}
}
}
#define ROL(x,k) (x << k | x >> (16-k))
#define MIX(j) \
R0 = R0 + cx->K[ 4*j+0] + (R3 & R2) + (~R3 & R1); R0 = ROL(R0,1);\
R1 = R1 + cx->K[ 4*j+1] + (R0 & R3) + (~R0 & R2); R1 = ROL(R1,2);\
R2 = R2 + cx->K[ 4*j+2] + (R1 & R0) + (~R1 & R3); R2 = ROL(R2,3);\
R3 = R3 + cx->K[ 4*j+3] + (R2 & R1) + (~R2 & R0); R3 = ROL(R3,5)
#define MASH \
R0 = R0 + cx->K[R3 & 63];\
R1 = R1 + cx->K[R0 & 63];\
R2 = R2 + cx->K[R1 & 63];\
R3 = R3 + cx->K[R2 & 63]
/* Encrypt one block */
static void
rc2_Encrypt1Block(RC2Context *cx, RC2Block *output, RC2Block *input)
{
register PRUint16 R0, R1, R2, R3;
/* step 1. Initialize input. */
R0 = input->s[0];
R1 = input->s[1];
R2 = input->s[2];
R3 = input->s[3];
/* step 2. Expand Key (already done, in context) */
/* step 3. j = 0 */
/* step 4. Perform 5 mixing rounds. */
MIX(0);
MIX(1);
MIX(2);
MIX(3);
MIX(4);
/* step 5. Perform 1 mashing round. */
MASH;
/* step 6. Perform 6 mixing rounds. */
MIX(5);
MIX(6);
MIX(7);
MIX(8);
MIX(9);
MIX(10);
/* step 7. Perform 1 mashing round. */
MASH;
/* step 8. Perform 5 mixing rounds. */
MIX(11);
MIX(12);
MIX(13);
MIX(14);
MIX(15);
/* output results */
output->s[0] = R0;
output->s[1] = R1;
output->s[2] = R2;
output->s[3] = R3;
}
#define ROR(x,k) (x >> k | x << (16-k))
#define R_MIX(j) \
R3 = ROR(R3,5); R3 = R3 - cx->K[ 4*j+3] - (R2 & R1) - (~R2 & R0); \
R2 = ROR(R2,3); R2 = R2 - cx->K[ 4*j+2] - (R1 & R0) - (~R1 & R3); \
R1 = ROR(R1,2); R1 = R1 - cx->K[ 4*j+1] - (R0 & R3) - (~R0 & R2); \
R0 = ROR(R0,1); R0 = R0 - cx->K[ 4*j+0] - (R3 & R2) - (~R3 & R1)
#define R_MASH \
R3 = R3 - cx->K[R2 & 63];\
R2 = R2 - cx->K[R1 & 63];\
R1 = R1 - cx->K[R0 & 63];\
R0 = R0 - cx->K[R3 & 63]
/* Encrypt one block */
static void
rc2_Decrypt1Block(RC2Context *cx, RC2Block *output, RC2Block *input)
{
register PRUint16 R0, R1, R2, R3;
/* step 1. Initialize input. */
R0 = input->s[0];
R1 = input->s[1];
R2 = input->s[2];
R3 = input->s[3];
/* step 2. Expand Key (already done, in context) */
/* step 3. j = 63 */
/* step 4. Perform 5 r_mixing rounds. */
R_MIX(15);
R_MIX(14);
R_MIX(13);
R_MIX(12);
R_MIX(11);
/* step 5. Perform 1 r_mashing round. */
R_MASH;
/* step 6. Perform 6 r_mixing rounds. */
R_MIX(10);
R_MIX(9);
R_MIX(8);
R_MIX(7);
R_MIX(6);
R_MIX(5);
/* step 7. Perform 1 r_mashing round. */
R_MASH;
/* step 8. Perform 5 r_mixing rounds. */
R_MIX(4);
R_MIX(3);
R_MIX(2);
R_MIX(1);
R_MIX(0);
/* output results */
output->s[0] = R0;
output->s[1] = R1;
output->s[2] = R2;
output->s[3] = R3;
}
static SECStatus
rc2_EncryptECB(RC2Context *cx, unsigned char *output,
const unsigned char *input, unsigned int inputLen)
{
RC2Block iBlock;
while (inputLen > 0) {
LOAD(iBlock.s)
rc2_Encrypt1Block(cx, &iBlock, &iBlock);
STORE(iBlock.s)
output += RC2_BLOCK_SIZE;
input += RC2_BLOCK_SIZE;
inputLen -= RC2_BLOCK_SIZE;
}
return SECSuccess;
}
static SECStatus
rc2_DecryptECB(RC2Context *cx, unsigned char *output,
const unsigned char *input, unsigned int inputLen)
{
RC2Block iBlock;
while (inputLen > 0) {
LOAD(iBlock.s)
rc2_Decrypt1Block(cx, &iBlock, &iBlock);
STORE(iBlock.s)
output += RC2_BLOCK_SIZE;
input += RC2_BLOCK_SIZE;
inputLen -= RC2_BLOCK_SIZE;
}
return SECSuccess;
}
static SECStatus
rc2_EncryptCBC(RC2Context *cx, unsigned char *output,
const unsigned char *input, unsigned int inputLen)
{
RC2Block iBlock;
while (inputLen > 0) {
LOAD(iBlock.s)
iBlock.l[0] ^= cx->iv.l[0];
iBlock.l[1] ^= cx->iv.l[1];
rc2_Encrypt1Block(cx, &iBlock, &iBlock);
cx->iv = iBlock;
STORE(iBlock.s)
output += RC2_BLOCK_SIZE;
input += RC2_BLOCK_SIZE;
inputLen -= RC2_BLOCK_SIZE;
}
return SECSuccess;
}
static SECStatus
rc2_DecryptCBC(RC2Context *cx, unsigned char *output,
const unsigned char *input, unsigned int inputLen)
{
RC2Block iBlock;
RC2Block oBlock;
while (inputLen > 0) {
LOAD(iBlock.s)
rc2_Decrypt1Block(cx, &oBlock, &iBlock);
oBlock.l[0] ^= cx->iv.l[0];
oBlock.l[1] ^= cx->iv.l[1];
cx->iv = iBlock;
STORE(oBlock.s)
output += RC2_BLOCK_SIZE;
input += RC2_BLOCK_SIZE;
inputLen -= RC2_BLOCK_SIZE;
}
return SECSuccess;
}
/*
** Perform RC2 encryption.
** "cx" the context
** "output" the output buffer to store the encrypted data.
** "outputLen" how much data is stored in "output". Set by the routine
** after some data is stored in output.
** "maxOutputLen" the maximum amount of data that can ever be
** stored in "output"
** "input" the input data
** "inputLen" the amount of input data
*/
SECStatus RC2_Encrypt(RC2Context *cx, unsigned char *output,
unsigned int *outputLen, unsigned int maxOutputLen,
const unsigned char *input, unsigned int inputLen)
{
SECStatus rv = SECSuccess;
if (inputLen) {
if (inputLen % RC2_BLOCK_SIZE) {
PORT_SetError(SEC_ERROR_INPUT_LEN);
return SECFailure;
}
if (maxOutputLen < inputLen) {
PORT_SetError(SEC_ERROR_OUTPUT_LEN);
return SECFailure;
}
rv = (*cx->enc)(cx, output, input, inputLen);
}
if (rv == SECSuccess) {
*outputLen = inputLen;
}
return rv;
}
/*
** Perform RC2 decryption.
** "cx" the context
** "output" the output buffer to store the decrypted data.
** "outputLen" how much data is stored in "output". Set by the routine
** after some data is stored in output.
** "maxOutputLen" the maximum amount of data that can ever be
** stored in "output"
** "input" the input data
** "inputLen" the amount of input data
*/
SECStatus RC2_Decrypt(RC2Context *cx, unsigned char *output,
unsigned int *outputLen, unsigned int maxOutputLen,
const unsigned char *input, unsigned int inputLen)
{
SECStatus rv = SECSuccess;
if (inputLen) {
if (inputLen % RC2_BLOCK_SIZE) {
PORT_SetError(SEC_ERROR_INPUT_LEN);
return SECFailure;
}
if (maxOutputLen < inputLen) {
PORT_SetError(SEC_ERROR_OUTPUT_LEN);
return SECFailure;
}
rv = (*cx->dec)(cx, output, input, inputLen);
}
if (rv == SECSuccess) {
*outputLen = inputLen;
}
return rv;
}