HGKeeper

* purple

* Purple is the legal property of its developers, whose names are too numerous

* to list here. Please refer to the COPYRIGHT file distributed with this

* source distribution.

* Original des taken from gpg

* des.c - DES and Triple-DES encryption/decryption Algorithm

* Please see below for more legal information!

* According to the definition of DES in FIPS PUB 46-2 from December 1993.

* For a description of triple encryption, see:

* Bruce Schneier: Applied Cryptography. Second Edition.

* John Wiley & Sons, 1996. ISBN 0-471-12845-7. Pages 358 ff.

* This file is part of GnuPG.

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation; either version 2 of the License, or

* (at your option) any later version.

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA

#include <cipher.h>

/******************************************************************************

* DES

*****************************************************************************/

typedef struct _des_ctx

{

guint32 encrypt_subkeys[32];

guint32 decrypt_subkeys[32];

} des_ctx[1];

* The s-box values are permuted according to the 'primitive function P'

static const guint32 sbox1[64] =

{

0x00808200, 0x00000000, 0x00008000, 0x00808202, 0x00808002, 0x00008202, 0x00000002, 0x00008000,

0x00000200, 0x00808200, 0x00808202, 0x00000200, 0x00800202, 0x00808002, 0x00800000, 0x00000002,

0x00000202, 0x00800200, 0x00800200, 0x00008200, 0x00008200, 0x00808000, 0x00808000, 0x00800202,

0x00008002, 0x00800002, 0x00800002, 0x00008002, 0x00000000, 0x00000202, 0x00008202, 0x00800000,

0x00008000, 0x00808202, 0x00000002, 0x00808000, 0x00808200, 0x00800000, 0x00800000, 0x00000200,

0x00808002, 0x00008000, 0x00008200, 0x00800002, 0x00000200, 0x00000002, 0x00800202, 0x00008202,

0x00808202, 0x00008002, 0x00808000, 0x00800202, 0x00800002, 0x00000202, 0x00008202, 0x00808200,

0x00000202, 0x00800200, 0x00800200, 0x00000000, 0x00008002, 0x00008200, 0x00000000, 0x00808002

};

static const guint32 sbox2[64] =

{

0x40084010, 0x40004000, 0x00004000, 0x00084010, 0x00080000, 0x00000010, 0x40080010, 0x40004010,

0x40000010, 0x40084010, 0x40084000, 0x40000000, 0x40004000, 0x00080000, 0x00000010, 0x40080010,

0x00084000, 0x00080010, 0x40004010, 0x00000000, 0x40000000, 0x00004000, 0x00084010, 0x40080000,

0x00080010, 0x40000010, 0x00000000, 0x00084000, 0x00004010, 0x40084000, 0x40080000, 0x00004010,

0x00000000, 0x00084010, 0x40080010, 0x00080000, 0x40004010, 0x40080000, 0x40084000, 0x00004000,

0x40080000, 0x40004000, 0x00000010, 0x40084010, 0x00084010, 0x00000010, 0x00004000, 0x40000000,

0x00004010, 0x40084000, 0x00080000, 0x40000010, 0x00080010, 0x40004010, 0x40000010, 0x00080010,

0x00084000, 0x00000000, 0x40004000, 0x00004010, 0x40000000, 0x40080010, 0x40084010, 0x00084000

};

static const guint32 sbox3[64] =

{

0x00000104, 0x04010100, 0x00000000, 0x04010004, 0x04000100, 0x00000000, 0x00010104, 0x04000100,

0x00010004, 0x04000004, 0x04000004, 0x00010000, 0x04010104, 0x00010004, 0x04010000, 0x00000104,

0x04000000, 0x00000004, 0x04010100, 0x00000100, 0x00010100, 0x04010000, 0x04010004, 0x00010104,

0x04000104, 0x00010100, 0x00010000, 0x04000104, 0x00000004, 0x04010104, 0x00000100, 0x04000000,

0x04010100, 0x04000000, 0x00010004, 0x00000104, 0x00010000, 0x04010100, 0x04000100, 0x00000000,

0x00000100, 0x00010004, 0x04010104, 0x04000100, 0x04000004, 0x00000100, 0x00000000, 0x04010004,

0x04000104, 0x00010000, 0x04000000, 0x04010104, 0x00000004, 0x00010104, 0x00010100, 0x04000004,

0x04010000, 0x04000104, 0x00000104, 0x04010000, 0x00010104, 0x00000004, 0x04010004, 0x00010100

};

static const guint32 sbox4[64] =

{

0x80401000, 0x80001040, 0x80001040, 0x00000040, 0x00401040, 0x80400040, 0x80400000, 0x80001000,

0x00000000, 0x00401000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00400040, 0x80400000,

0x80000000, 0x00001000, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x80001000, 0x00001040,

0x80400040, 0x80000000, 0x00001040, 0x00400040, 0x00001000, 0x00401040, 0x80401040, 0x80000040,

0x00400040, 0x80400000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00000000, 0x00401000,

0x00001040, 0x00400040, 0x80400040, 0x80000000, 0x80401000, 0x80001040, 0x80001040, 0x00000040,

0x80401040, 0x80000040, 0x80000000, 0x00001000, 0x80400000, 0x80001000, 0x00401040, 0x80400040,

0x80001000, 0x00001040, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x00001000, 0x00401040

};

static const guint32 sbox5[64] =

{

0x00000080, 0x01040080, 0x01040000, 0x21000080, 0x00040000, 0x00000080, 0x20000000, 0x01040000,

0x20040080, 0x00040000, 0x01000080, 0x20040080, 0x21000080, 0x21040000, 0x00040080, 0x20000000,

0x01000000, 0x20040000, 0x20040000, 0x00000000, 0x20000080, 0x21040080, 0x21040080, 0x01000080,

0x21040000, 0x20000080, 0x00000000, 0x21000000, 0x01040080, 0x01000000, 0x21000000, 0x00040080,

0x00040000, 0x21000080, 0x00000080, 0x01000000, 0x20000000, 0x01040000, 0x21000080, 0x20040080,

0x01000080, 0x20000000, 0x21040000, 0x01040080, 0x20040080, 0x00000080, 0x01000000, 0x21040000,

0x21040080, 0x00040080, 0x21000000, 0x21040080, 0x01040000, 0x00000000, 0x20040000, 0x21000000,

0x00040080, 0x01000080, 0x20000080, 0x00040000, 0x00000000, 0x20040000, 0x01040080, 0x20000080

};

static const guint32 sbox6[64] =

{

0x10000008, 0x10200000, 0x00002000, 0x10202008, 0x10200000, 0x00000008, 0x10202008, 0x00200000,

0x10002000, 0x00202008, 0x00200000, 0x10000008, 0x00200008, 0x10002000, 0x10000000, 0x00002008,

0x00000000, 0x00200008, 0x10002008, 0x00002000, 0x00202000, 0x10002008, 0x00000008, 0x10200008,

0x10200008, 0x00000000, 0x00202008, 0x10202000, 0x00002008, 0x00202000, 0x10202000, 0x10000000,

0x10002000, 0x00000008, 0x10200008, 0x00202000, 0x10202008, 0x00200000, 0x00002008, 0x10000008,

0x00200000, 0x10002000, 0x10000000, 0x00002008, 0x10000008, 0x10202008, 0x00202000, 0x10200000,

0x00202008, 0x10202000, 0x00000000, 0x10200008, 0x00000008, 0x00002000, 0x10200000, 0x00202008,

0x00002000, 0x00200008, 0x10002008, 0x00000000, 0x10202000, 0x10000000, 0x00200008, 0x10002008

};

static const guint32 sbox7[64] =

{

0x00100000, 0x02100001, 0x02000401, 0x00000000, 0x00000400, 0x02000401, 0x00100401, 0x02100400,

0x02100401, 0x00100000, 0x00000000, 0x02000001, 0x00000001, 0x02000000, 0x02100001, 0x00000401,

0x02000400, 0x00100401, 0x00100001, 0x02000400, 0x02000001, 0x02100000, 0x02100400, 0x00100001,

0x02100000, 0x00000400, 0x00000401, 0x02100401, 0x00100400, 0x00000001, 0x02000000, 0x00100400,

0x02000000, 0x00100400, 0x00100000, 0x02000401, 0x02000401, 0x02100001, 0x02100001, 0x00000001,

0x00100001, 0x02000000, 0x02000400, 0x00100000, 0x02100400, 0x00000401, 0x00100401, 0x02100400,

0x00000401, 0x02000001, 0x02100401, 0x02100000, 0x00100400, 0x00000000, 0x00000001, 0x02100401,

0x00000000, 0x00100401, 0x02100000, 0x00000400, 0x02000001, 0x02000400, 0x00000400, 0x00100001

};

static const guint32 sbox8[64] =

{

0x08000820, 0x00000800, 0x00020000, 0x08020820, 0x08000000, 0x08000820, 0x00000020, 0x08000000,

0x00020020, 0x08020000, 0x08020820, 0x00020800, 0x08020800, 0x00020820, 0x00000800, 0x00000020,

0x08020000, 0x08000020, 0x08000800, 0x00000820, 0x00020800, 0x00020020, 0x08020020, 0x08020800,

0x00000820, 0x00000000, 0x00000000, 0x08020020, 0x08000020, 0x08000800, 0x00020820, 0x00020000,

0x00020820, 0x00020000, 0x08020800, 0x00000800, 0x00000020, 0x08020020, 0x00000800, 0x00020820,

0x08000800, 0x00000020, 0x08000020, 0x08020000, 0x08020020, 0x08000000, 0x00020000, 0x08000820,

0x00000000, 0x08020820, 0x00020020, 0x08000020, 0x08020000, 0x08000800, 0x08000820, 0x00000000,

0x08020820, 0x00020800, 0x00020800, 0x00000820, 0x00000820, 0x00020020, 0x08000000, 0x08020800

};

* * These two tables are part of the 'permuted choice 1' function.

* * In this implementation several speed improvements are done.

* */

static const guint32 leftkey_swap[16] =

{

0x00000000, 0x00000001, 0x00000100, 0x00000101,

0x00010000, 0x00010001, 0x00010100, 0x00010101,

0x01000000, 0x01000001, 0x01000100, 0x01000101,

0x01010000, 0x01010001, 0x01010100, 0x01010101

};

static const guint32 rightkey_swap[16] =

{

0x00000000, 0x01000000, 0x00010000, 0x01010000,

0x00000100, 0x01000100, 0x00010100, 0x01010100,

0x00000001, 0x01000001, 0x00010001, 0x01010001,

0x00000101, 0x01000101, 0x00010101, 0x01010101,

};

* Numbers of left shifts per round for encryption subkey schedule

* To calculate the decryption key scheduling we just reverse the

* ordering of the subkeys so we can omit the table for decryption

* subkey schedule.

static const guint8 encrypt_rotate_tab[16] =

{

1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1

};

* Macro to swap bits across two words

**/

#define DO_PERMUTATION(a, temp, b, offset, mask) \

temp = ((a>>offset) ^ b) & mask; \

b ^= temp; \

a ^= temp<<offset;

* This performs the 'initial permutation' for the data to be encrypted or decrypted

**/

#define INITIAL_PERMUTATION(left, temp, right) \

DO_PERMUTATION(left, temp, right, 4, 0x0f0f0f0f) \

DO_PERMUTATION(left, temp, right, 16, 0x0000ffff) \

DO_PERMUTATION(right, temp, left, 2, 0x33333333) \

DO_PERMUTATION(right, temp, left, 8, 0x00ff00ff) \

DO_PERMUTATION(left, temp, right, 1, 0x55555555)

* The 'inverse initial permutation'

**/

#define FINAL_PERMUTATION(left, temp, right) \

DO_PERMUTATION(left, temp, right, 1, 0x55555555) \

DO_PERMUTATION(right, temp, left, 8, 0x00ff00ff) \

DO_PERMUTATION(right, temp, left, 2, 0x33333333) \

DO_PERMUTATION(left, temp, right, 16, 0x0000ffff) \

DO_PERMUTATION(left, temp, right, 4, 0x0f0f0f0f)

* A full DES round including 'expansion function', 'sbox substitution'

* and 'primitive function P' but without swapping the left and right word.

**/

#define DES_ROUND(from, to, work, subkey) \

work = ((from<<1) | (from>>31)) ^ *subkey++; \

to ^= sbox8[ work & 0x3f ]; \

to ^= sbox6[ (work>>8) & 0x3f ]; \

to ^= sbox4[ (work>>16) & 0x3f ]; \

to ^= sbox2[ (work>>24) & 0x3f ]; \

work = ((from>>3) | (from<<29)) ^ *subkey++; \

to ^= sbox7[ work & 0x3f ]; \

to ^= sbox5[ (work>>8) & 0x3f ]; \

to ^= sbox3[ (work>>16) & 0x3f ]; \

to ^= sbox1[ (work>>24) & 0x3f ];

* Macros to convert 8 bytes from/to 32bit words

**/

#define READ_64BIT_DATA(data, left, right) \

left = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3]; \

right = (data[4] << 24) | (data[5] << 16) | (data[6] << 8) | data[7];

#define WRITE_64BIT_DATA(data, left, right) \

data[0] = (left >> 24) &0xff; data[1] = (left >> 16) &0xff; \

data[2] = (left >> 8) &0xff; data[3] = left &0xff; \

data[4] = (right >> 24) &0xff; data[5] = (right >> 16) &0xff; \

data[6] = (right >> 8) &0xff; data[7] = right &0xff;

* des_key_schedule(): Calculate 16 subkeys pairs (even/odd) for

* 16 encryption rounds.

* To calculate subkeys for decryption the caller

* have to reorder the generated subkeys.

* rawkey: 8 Bytes of key data

* subkey: Array of at least 32 guint32s. Will be filled

* with calculated subkeys.

**/

static void

des_key_schedule (const guint8 * rawkey, guint32 * subkey)

{

guint32 left, right, work;

int round;

READ_64BIT_DATA (rawkey, left, right)

DO_PERMUTATION (right, work, left, 4, 0x0f0f0f0f)

DO_PERMUTATION (right, work, left, 0, 0x10101010)

left = (leftkey_swap[(left >> 0) & 0xf] << 3) | (leftkey_swap[(left >> 8) & 0xf] << 2)

| (leftkey_swap[(left >> 16) & 0xf] << 1) | (leftkey_swap[(left >> 24) & 0xf])

| (leftkey_swap[(left >> 5) & 0xf] << 7) | (leftkey_swap[(left >> 13) & 0xf] << 6)

| (leftkey_swap[(left >> 21) & 0xf] << 5) | (leftkey_swap[(left >> 29) & 0xf] << 4);

left &= 0x0fffffff;

right = (rightkey_swap[(right >> 1) & 0xf] << 3) | (rightkey_swap[(right >> 9) & 0xf] << 2)

| (rightkey_swap[(right >> 17) & 0xf] << 1) | (rightkey_swap[(right >> 25) & 0xf])

| (rightkey_swap[(right >> 4) & 0xf] << 7) | (rightkey_swap[(right >> 12) & 0xf] << 6)

| (rightkey_swap[(right >> 20) & 0xf] << 5) | (rightkey_swap[(right >> 28) & 0xf] << 4);

right &= 0x0fffffff;

for (round = 0; round < 16; ++round)

{

left = ((left << encrypt_rotate_tab[round]) | (left >> (28 - encrypt_rotate_tab[round]))) & 0x0fffffff;

right = ((right << encrypt_rotate_tab[round]) | (right >> (28 - encrypt_rotate_tab[round]))) & 0x0fffffff;

*subkey++ = ((left << 4) & 0x24000000)

| ((left << 28) & 0x10000000)

| ((left << 14) & 0x08000000)

| ((left << 18) & 0x02080000)

| ((left << 6) & 0x01000000)

| ((left << 9) & 0x00200000)

| ((left >> 1) & 0x00100000)

| ((left << 10) & 0x00040000)

| ((left << 2) & 0x00020000)

| ((left >> 10) & 0x00010000)

| ((right >> 13) & 0x00002000)

| ((right >> 4) & 0x00001000)

| ((right << 6) & 0x00000800)

| ((right >> 1) & 0x00000400)

| ((right >> 14) & 0x00000200)

| (right & 0x00000100)

| ((right >> 5) & 0x00000020)

| ((right >> 10) & 0x00000010)

| ((right >> 3) & 0x00000008)

| ((right >> 18) & 0x00000004)

| ((right >> 26) & 0x00000002)

| ((right >> 24) & 0x00000001);

*subkey++ = ((left << 15) & 0x20000000)

| ((left << 17) & 0x10000000)

| ((left << 10) & 0x08000000)

| ((left << 22) & 0x04000000)

| ((left >> 2) & 0x02000000)

| ((left << 1) & 0x01000000)

| ((left << 16) & 0x00200000)

| ((left << 11) & 0x00100000)

| ((left << 3) & 0x00080000)

| ((left >> 6) & 0x00040000)

| ((left << 15) & 0x00020000)

| ((left >> 4) & 0x00010000)

| ((right >> 2) & 0x00002000)

| ((right << 8) & 0x00001000)

| ((right >> 14) & 0x00000808)

| ((right >> 9) & 0x00000400)

| ((right) & 0x00000200)

| ((right << 7) & 0x00000100)

| ((right >> 7) & 0x00000020)

| ((right >> 3) & 0x00000011)

| ((right << 2) & 0x00000004)

| ((right >> 21) & 0x00000002);

}

* Fill a DES context with subkeys calculated from a 64bit key.

* Does not check parity bits, but simply ignore them.

* Does not check for weak keys.

**/

static void

des_set_key (PurpleCipherContext *context, const guchar * key)

{

struct _des_ctx *ctx = purple_cipher_context_get_data(context);

int i;

des_key_schedule (key, ctx->encrypt_subkeys);

for(i=0; i<32; i+=2)

{

ctx->decrypt_subkeys[i] = ctx->encrypt_subkeys[30-i];

ctx->decrypt_subkeys[i+1] = ctx->encrypt_subkeys[31-i];

}

* Electronic Codebook Mode DES encryption/decryption of data according

* to 'mode'.

**/

static int

des_ecb_crypt (struct _des_ctx *ctx, const guint8 * from, guint8 * to, int mode)

{

guint32 left, right, work;

guint32 *keys;

keys = mode ? ctx->decrypt_subkeys : ctx->encrypt_subkeys;

READ_64BIT_DATA (from, left, right)

INITIAL_PERMUTATION (left, work, right)

DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)

FINAL_PERMUTATION (right, work, left)

WRITE_64BIT_DATA (to, right, left)

return 0;

}

static gint

des_encrypt(PurpleCipherContext *context, const guchar data[],

size_t len, guchar output[], size_t *outlen)

{

int offset = 0;

int i = 0;

int tmp;

guint8 buf[8] = {0,0,0,0,0,0,0,0};

while(offset+8<=len) {

des_ecb_crypt(purple_cipher_context_get_data(context),

data+offset,

output+offset,

0);

offset+=8;

}

*outlen = len;

if(offset<len) {

*outlen += len - offset;

tmp = offset;

while(tmp<len) {

buf[i++] = data[tmp];

tmp++;

}

des_ecb_crypt(purple_cipher_context_get_data(context),

buf,

output+offset,

0);

}

return 0;

}

static gint

des_decrypt(PurpleCipherContext *context, const guchar data[],

size_t len, guchar output[], size_t *outlen)

{

int offset = 0;

int i = 0;

int tmp;

guint8 buf[8] = {0,0,0,0,0,0,0,0};

while(offset+8<=len) {

des_ecb_crypt(purple_cipher_context_get_data(context),

data+offset,

output+offset,

1);

offset+=8;

}

*outlen = len;

if(offset<len) {

*outlen += len - offset;

tmp = offset;

while(tmp<len) {

buf[i++] = data[tmp];

tmp++;

}

des_ecb_crypt(purple_cipher_context_get_data(context),

buf,

output+offset,

1);

}

return 0;

}

static void

des_init(PurpleCipherContext *context, gpointer extra) {

struct _des_ctx *mctx;

mctx = g_new0(struct _des_ctx, 1);

purple_cipher_context_set_data(context, mctx);

}

static void

des_uninit(PurpleCipherContext *context) {

struct _des_ctx *des_context;

des_context = purple_cipher_context_get_data(context);

memset(des_context, 0, sizeof(*des_context));

g_free(des_context);

des_context = NULL;

}

static PurpleCipherOps DESOps = {

NULL, /* Set option */

NULL, /* Get option */

des_init, /* init */

NULL, /* reset */

des_uninit, /* uninit */

NULL, /* set iv */

NULL, /* append */

NULL, /* digest */

des_encrypt, /* encrypt */

des_decrypt, /* decrypt */

NULL, /* set salt */

NULL, /* get salt size */

des_set_key, /* set key */

NULL, /* get key size */

NULL, /* set batch mode */

NULL, /* get batch mode */

NULL, /* get block size */

NULL /* set key with len */

};

/******************************************************************************

* Triple-DES

*****************************************************************************/

typedef struct _des3_ctx

{

PurpleCipherBatchMode mode;

guchar iv[8];

/* First key for encryption */

struct _des_ctx key1;

/* Second key for decryption */

struct _des_ctx key2;

/* Third key for encryption */

struct _des_ctx key3;

} des3_ctx[1];

* Fill a DES3 context with subkeys calculated from 3 64bit key.

* Does not check parity bits, but simply ignore them.

* Does not check for weak keys.

**/

static void

des3_set_key(PurpleCipherContext *context, const guchar * key)

{

struct _des3_ctx *ctx = purple_cipher_context_get_data(context);

int i;

des_key_schedule (key + 0, ctx->key1.encrypt_subkeys);

des_key_schedule (key + 8, ctx->key2.encrypt_subkeys);

des_key_schedule (key + 16, ctx->key3.encrypt_subkeys);

for (i = 0; i < 32; i += 2)

{

ctx->key1.decrypt_subkeys[i] = ctx->key1.encrypt_subkeys[30-i];

ctx->key1.decrypt_subkeys[i+1] = ctx->key1.encrypt_subkeys[31-i];

ctx->key2.decrypt_subkeys[i] = ctx->key2.encrypt_subkeys[30-i];

ctx->key2.decrypt_subkeys[i+1] = ctx->key2.encrypt_subkeys[31-i];

ctx->key3.decrypt_subkeys[i] = ctx->key3.encrypt_subkeys[30-i];

ctx->key3.decrypt_subkeys[i+1] = ctx->key3.encrypt_subkeys[31-i];

}

static gint

des3_ecb_encrypt(struct _des3_ctx *ctx, const guchar data[],

size_t len, guchar output[], size_t *outlen)

{

int offset = 0;

int i = 0;

int tmp;

guint8 buf[8] = {0,0,0,0,0,0,0,0};

while (offset + 8 <= len) {

des_ecb_crypt(&ctx->key1,

data+offset,

output+offset,

0);

des_ecb_crypt(&ctx->key2,

output+offset,

buf,

1);

des_ecb_crypt(&ctx->key3,

buf,

output+offset,

0);

offset += 8;

}

*outlen = len;

if (offset < len) {

*outlen += len - offset;

tmp = offset;

memset(buf, 0, 8);

while (tmp < len) {

buf[i++] = data[tmp];

tmp++;

}

des_ecb_crypt(&ctx->key1,

buf,

output+offset,

0);

des_ecb_crypt(&ctx->key2,

output+offset,

buf,

1);

des_ecb_crypt(&ctx->key3,

buf,

output+offset,

0);

}

return 0;

}

static gint

des3_cbc_encrypt(struct _des3_ctx *ctx, const guchar data[],

size_t len, guchar output[], size_t *outlen)

{

int offset = 0;

int i = 0;

int tmp;

guint8 buf[8];

memcpy(buf, ctx->iv, 8);

while (offset + 8 <= len) {

for (i = 0; i < 8; i++)

buf[i] ^= data[offset + i];

des_ecb_crypt(&ctx->key1,

buf,

output+offset,

0);

des_ecb_crypt(&ctx->key2,

output+offset,

buf,

1);

des_ecb_crypt(&ctx->key3,

buf,

output+offset,

0);

memcpy(buf, output+offset, 8);

offset += 8;

}

*outlen = len;

if (offset < len) {

*outlen += len - offset;

tmp = offset;

i = 0;

while (tmp < len) {

buf[i++] ^= data[tmp];

tmp++;

}

des_ecb_crypt(&ctx->key1,

buf,

output+offset,

0);

des_ecb_crypt(&ctx->key2,

output+offset,

buf,

1);

des_ecb_crypt(&ctx->key3,

buf,

output+offset,

0);

}

return 0;

}

static gint

des3_encrypt(PurpleCipherContext *context, const guchar data[],

size_t len, guchar output[], size_t *outlen)

{

struct _des3_ctx *ctx = purple_cipher_context_get_data(context);

if (ctx->mode == PURPLE_CIPHER_BATCH_MODE_ECB) {

return des3_ecb_encrypt(ctx, data, len, output, outlen);

} else if (ctx->mode == PURPLE_CIPHER_BATCH_MODE_CBC) {

return des3_cbc_encrypt(ctx, data, len, output, outlen);

} else {

g_return_val_if_reached(0);

}

return 0;

}

static gint

des3_ecb_decrypt(struct _des3_ctx *ctx, const guchar data[],

size_t len, guchar output[], size_t *outlen)

{

int offset = 0;

int i = 0;

int tmp;

guint8 buf[8] = {0,0,0,0,0,0,0,0};

while (offset + 8 <= len) {

/* NOTE: Apply key in reverse */

des_ecb_crypt(&ctx->key3,

data+offset,

output+offset,

1);

des_ecb_crypt(&ctx->key2,

output+offset,

buf,

0);

des_ecb_crypt(&ctx->key1,

buf,

output+offset,

1);

offset+=8;

}

*outlen = len;

if (offset < len) {

*outlen += len - offset;

tmp = offset;

memset(buf, 0, 8);

while (tmp < len) {

buf[i++] = data[tmp];

tmp++;

}

des_ecb_crypt(&ctx->key3,

buf,

output+offset,

1);

des_ecb_crypt(&ctx->key2,

output+offset,

buf,

0);

des_ecb_crypt(&ctx->key1,

buf,

output+offset,

1);

}

return 0;

}

static gint

des3_cbc_decrypt(struct _des3_ctx *ctx, const guchar data[],

size_t len, guchar output[], size_t *outlen)

{

int offset = 0;

int i = 0;

int tmp;

guint8 buf[8] = {0,0,0,0,0,0,0,0};

guint8 link[8];

memcpy(link, ctx->iv, 8);

while (offset + 8 <= len) {

des_ecb_crypt(&ctx->key3,

data+offset,

output+offset,

1);

des_ecb_crypt(&ctx->key2,

output+offset,

buf,

0);

des_ecb_crypt(&ctx->key1,

buf,

output+offset,

1);

for (i = 0; i < 8; i++)

output[offset + i] ^= link[i];

memcpy(link, data + offset, 8);

offset+=8;

}

*outlen = len;

if(offset<len) {

*outlen += len - offset;

tmp = offset;

memset(buf, 0, 8);

i = 0;

while(tmp<len) {

buf[i++] = data[tmp];

tmp++;

}

des_ecb_crypt(&ctx->key3,

buf,

output+offset,

1);

des_ecb_crypt(&ctx->key2,

output+offset,

buf,

0);

des_ecb_crypt(&ctx->key1,

buf,

output+offset,

1);

for (i = 0; i < 8; i++)

output[offset + i] ^= link[i];

}

return 0;

}

static gint

des3_decrypt(PurpleCipherContext *context, const guchar data[],

size_t len, guchar output[], size_t *outlen)

{

struct _des3_ctx *ctx = purple_cipher_context_get_data(context);

if (ctx->mode == PURPLE_CIPHER_BATCH_MODE_ECB) {

return des3_ecb_decrypt(ctx, data, len, output, outlen);

} else if (ctx->mode == PURPLE_CIPHER_BATCH_MODE_CBC) {

return des3_cbc_decrypt(ctx, data, len, output, outlen);

} else {

g_return_val_if_reached(0);

}

return 0;

}

static void

des3_set_batch(PurpleCipherContext *context, PurpleCipherBatchMode mode)

{

struct _des3_ctx *ctx = purple_cipher_context_get_data(context);

ctx->mode = mode;

}

static PurpleCipherBatchMode

des3_get_batch(PurpleCipherContext *context)

{

struct _des3_ctx *ctx = purple_cipher_context_get_data(context);

return ctx->mode;

}

static void

des3_set_iv(PurpleCipherContext *context, guchar *iv, size_t len)

{

struct _des3_ctx *ctx;

g_return_if_fail(len == 8);

ctx = purple_cipher_context_get_data(context);

memcpy(ctx->iv, iv, len);

}

static void

des3_init(PurpleCipherContext *context, gpointer extra)

{

struct _des3_ctx *mctx;

mctx = g_new0(struct _des3_ctx, 1);

purple_cipher_context_set_data(context, mctx);

}

static void

des3_uninit(PurpleCipherContext *context)

{

struct _des3_ctx *des3_context;

des3_context = purple_cipher_context_get_data(context);

memset(des3_context, 0, sizeof(*des3_context));

g_free(des3_context);

des3_context = NULL;

}

static PurpleCipherOps DES3Ops = {

NULL, /* Set option */

NULL, /* Get option */

des3_init, /* init */

NULL, /* reset */

des3_uninit, /* uninit */

des3_set_iv, /* set iv */

NULL, /* append */

NULL, /* digest */

des3_encrypt, /* encrypt */

des3_decrypt, /* decrypt */

NULL, /* set salt */

NULL, /* get salt size */

des3_set_key, /* set key */

NULL, /* get key size */

des3_set_batch, /* set batch mode */

des3_get_batch, /* get batch mode */

NULL, /* get block size */

NULL /* set key with len */

};

/******************************************************************************

* Registration

*****************************************************************************/

PurpleCipherOps *

purple_des_cipher_get_ops(void) {

return &DESOps;

}

PurpleCipherOps *

purple_des3_cipher_get_ops(void) {

return &DES3Ops;

}

pidgin/pidgin