www.pudn.com > serpent.rar > serpent.c
/* Copyright (C) 1998 Ross Anderson, Eli Biham, Lars Knudsen
* All rights reserved.
*
* This code is freely distributed for AES selection process.
* No other use is allowed.
*
* Copyright remains of the copyright holders, and as such any Copyright
* notices in the code are not to be removed.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only for the AES selection process, provided
* that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed without the authors permission.
* i.e. this code cannot simply be copied and put under another distribution
* licence [including the GNU Public Licence.]
*/
#include "serpent.h"
#include "serpentsboxes.h"
/* The functions */
int makeKey(keyInstance *key, BYTE direction, int keyLen,
char *keyMaterial)
{
unsigned long i,j;
unsigned long w[132],k[132];
int rc;
if(direction != DIR_ENCRYPT &&
direction != DIR_DECRYPT)
return BAD_KEY_DIR;
if(keyLen>256 || keyLen<1)
return BAD_KEY_MAT;
key->direction=direction;
key->keyLen=keyLen;
strncpy(key->keyMaterial, keyMaterial, MAX_KEY_SIZE+1);
rc=serpent_convert_from_string(keyLen, keyMaterial, key->key);
if(rc<=0)
return BAD_KEY_MAT;
for(i=0; ikey[i];
if(keyLen<256)
w[i]=(key->key[i]&((1L<<((keyLen&31)))-1))|(1L<<((keyLen&31)));
for(i++; i<8; i++)
w[i]=0;
for(i=8; i<16; i++)
w[i]=ROL(w[i-8]^w[i-5]^w[i-3]^w[i-1]^PHI^(i-8),11);
for(i=0; i<8; i++)
w[i]=w[i+8];
for(i=8; i<132; i++)
w[i]=ROL(w[i-8]^w[i-5]^w[i-3]^w[i-1]^PHI^i,11);
RND03(w[ 0], w[ 1], w[ 2], w[ 3], k[ 0], k[ 1], k[ 2], k[ 3]);
RND02(w[ 4], w[ 5], w[ 6], w[ 7], k[ 4], k[ 5], k[ 6], k[ 7]);
RND01(w[ 8], w[ 9], w[ 10], w[ 11], k[ 8], k[ 9], k[ 10], k[ 11]);
RND00(w[ 12], w[ 13], w[ 14], w[ 15], k[ 12], k[ 13], k[ 14], k[ 15]);
RND31(w[ 16], w[ 17], w[ 18], w[ 19], k[ 16], k[ 17], k[ 18], k[ 19]);
RND30(w[ 20], w[ 21], w[ 22], w[ 23], k[ 20], k[ 21], k[ 22], k[ 23]);
RND29(w[ 24], w[ 25], w[ 26], w[ 27], k[ 24], k[ 25], k[ 26], k[ 27]);
RND28(w[ 28], w[ 29], w[ 30], w[ 31], k[ 28], k[ 29], k[ 30], k[ 31]);
RND27(w[ 32], w[ 33], w[ 34], w[ 35], k[ 32], k[ 33], k[ 34], k[ 35]);
RND26(w[ 36], w[ 37], w[ 38], w[ 39], k[ 36], k[ 37], k[ 38], k[ 39]);
RND25(w[ 40], w[ 41], w[ 42], w[ 43], k[ 40], k[ 41], k[ 42], k[ 43]);
RND24(w[ 44], w[ 45], w[ 46], w[ 47], k[ 44], k[ 45], k[ 46], k[ 47]);
RND23(w[ 48], w[ 49], w[ 50], w[ 51], k[ 48], k[ 49], k[ 50], k[ 51]);
RND22(w[ 52], w[ 53], w[ 54], w[ 55], k[ 52], k[ 53], k[ 54], k[ 55]);
RND21(w[ 56], w[ 57], w[ 58], w[ 59], k[ 56], k[ 57], k[ 58], k[ 59]);
RND20(w[ 60], w[ 61], w[ 62], w[ 63], k[ 60], k[ 61], k[ 62], k[ 63]);
RND19(w[ 64], w[ 65], w[ 66], w[ 67], k[ 64], k[ 65], k[ 66], k[ 67]);
RND18(w[ 68], w[ 69], w[ 70], w[ 71], k[ 68], k[ 69], k[ 70], k[ 71]);
RND17(w[ 72], w[ 73], w[ 74], w[ 75], k[ 72], k[ 73], k[ 74], k[ 75]);
RND16(w[ 76], w[ 77], w[ 78], w[ 79], k[ 76], k[ 77], k[ 78], k[ 79]);
RND15(w[ 80], w[ 81], w[ 82], w[ 83], k[ 80], k[ 81], k[ 82], k[ 83]);
RND14(w[ 84], w[ 85], w[ 86], w[ 87], k[ 84], k[ 85], k[ 86], k[ 87]);
RND13(w[ 88], w[ 89], w[ 90], w[ 91], k[ 88], k[ 89], k[ 90], k[ 91]);
RND12(w[ 92], w[ 93], w[ 94], w[ 95], k[ 92], k[ 93], k[ 94], k[ 95]);
RND11(w[ 96], w[ 97], w[ 98], w[ 99], k[ 96], k[ 97], k[ 98], k[ 99]);
RND10(w[100], w[101], w[102], w[103], k[100], k[101], k[102], k[103]);
RND09(w[104], w[105], w[106], w[107], k[104], k[105], k[106], k[107]);
RND08(w[108], w[109], w[110], w[111], k[108], k[109], k[110], k[111]);
RND07(w[112], w[113], w[114], w[115], k[112], k[113], k[114], k[115]);
RND06(w[116], w[117], w[118], w[119], k[116], k[117], k[118], k[119]);
RND05(w[120], w[121], w[122], w[123], k[120], k[121], k[122], k[123]);
RND04(w[124], w[125], w[126], w[127], k[124], k[125], k[126], k[127]);
RND03(w[128], w[129], w[130], w[131], k[128], k[129], k[130], k[131]);
for(i=0; i<=32; i++)
for(j=0; j<4; j++)
key->subkeys[i][j] = k[4*i+j];
return TRUE;
}
int cipherInit(cipherInstance *cipher, BYTE mode, char *IV)
{
int i;
int rc;
if((mode != MODE_ECB) &&
(mode != MODE_CBC) &&
(mode != MODE_CFB1))
return BAD_CIPHER_MODE;
cipher->mode = mode; /* MODE_ECB, MODE_CBC, or MODE_CFB1 */
cipher->blockSize=128;
if(mode != MODE_ECB)
{
rc=serpent_convert_from_string(cipher->blockSize, IV, cipher->IV);
if(rc<=0)
return BAD_CIPHER_STATE;
}
return TRUE;
}
int blockEncrypt(cipherInstance *cipher,
keyInstance *key,
BYTE *input,
int inputLen,
BYTE *outBuffer)
{
unsigned long t[4];
int i, b;
/*
* Note about optimization: the code becomes slower of the calls to
* serpent_encrypt and serpent_decrypt are replaced by inlined code.
* (tested on Pentium 133MMX)
*/
switch(cipher->mode)
{
case MODE_ECB:
for(b=0; bsubkeys);
return inputLen;
case MODE_CBC:
t[0] = ((unsigned long*)cipher->IV)[0];
t[1] = ((unsigned long*)cipher->IV)[1];
t[2] = ((unsigned long*)cipher->IV)[2];
t[3] = ((unsigned long*)cipher->IV)[3];
for(b=0; bsubkeys);
((unsigned long*)outBuffer)[0] = t[0];
((unsigned long*)outBuffer)[1] = t[1];
((unsigned long*)outBuffer)[2] = t[2];
((unsigned long*)outBuffer)[3] = t[3];
}
((unsigned long*)cipher->IV)[0] = t[0];
((unsigned long*)cipher->IV)[1] = t[1];
((unsigned long*)cipher->IV)[2] = t[2];
((unsigned long*)cipher->IV)[3] = t[3];
return inputLen;
case MODE_CFB1:
t[0] = ((unsigned long*)cipher->IV)[0];
t[1] = ((unsigned long*)cipher->IV)[1];
t[2] = ((unsigned long*)cipher->IV)[2];
t[3] = ((unsigned long*)cipher->IV)[3];
for(b=0; bsubkeys);
bytedata ^= (tt[0]&1);
tt[0] = ((tt[0]>>1)&0x7FFFFFFF) | ((tt[1]&1)<<31);
tt[1] = ((tt[1]>>1)&0x7FFFFFFF) | ((tt[2]&1)<<31);
tt[2] = ((tt[2]>>1)&0x7FFFFFFF) | ((tt[3]&1)<<31);
tt[3] = ((tt[3]>>1)&0x7FFFFFFF) | ((bytedata&1)<<31);
bytedata = bytedata>>1;
}
outBuffer[0] = (t[3]>>24)&0xFF;
}
((unsigned long*)cipher->IV)[0] = t[0];
((unsigned long*)cipher->IV)[1] = t[1];
((unsigned long*)cipher->IV)[2] = t[2];
((unsigned long*)cipher->IV)[3] = t[3];
return inputLen;
default:
return BAD_CIPHER_STATE;
}
}
int blockDecrypt(cipherInstance *cipher,
keyInstance *key,
BYTE *input,
int inputLen,
BYTE *outBuffer)
{
unsigned long t[4];
int i, b;
switch(cipher->mode)
{
case MODE_ECB:
for(b=0; bsubkeys);
return inputLen;
case MODE_CBC:
t[0] = ((unsigned long*)cipher->IV)[0];
t[1] = ((unsigned long*)cipher->IV)[1];
t[2] = ((unsigned long*)cipher->IV)[2];
t[3] = ((unsigned long*)cipher->IV)[3];
for(b=0; bsubkeys);
((unsigned long*)outBuffer)[0] ^= t[0];
((unsigned long*)outBuffer)[1] ^= t[1];
((unsigned long*)outBuffer)[2] ^= t[2];
((unsigned long*)outBuffer)[3] ^= t[3];
t[0] = ((unsigned long*)input)[0];
t[1] = ((unsigned long*)input)[1];
t[2] = ((unsigned long*)input)[2];
t[3] = ((unsigned long*)input)[3];
}
((unsigned long*)cipher->IV)[0] = t[0];
((unsigned long*)cipher->IV)[1] = t[1];
((unsigned long*)cipher->IV)[2] = t[2];
((unsigned long*)cipher->IV)[3] = t[3];
return inputLen;
case MODE_CFB1:
t[0] = ((unsigned long*)cipher->IV)[0];
t[1] = ((unsigned long*)cipher->IV)[1];
t[2] = ((unsigned long*)cipher->IV)[2];
t[3] = ((unsigned long*)cipher->IV)[3];
for(b=0; bsubkeys);
outdata |= ((bytedata^tt[0])&1)<>1)&0x7FFFFFFF) | ((tt[1]&1)<<31);
tt[1] = ((tt[1]>>1)&0x7FFFFFFF) | ((tt[2]&1)<<31);
tt[2] = ((tt[2]>>1)&0x7FFFFFFF) | ((tt[3]&1)<<31);
tt[3] = ((tt[3]>>1)&0x7FFFFFFF) | ((bytedata&1)<<31);
bytedata = bytedata>>1;
}
outBuffer[0] = outdata;
}
((unsigned long*)cipher->IV)[0] = t[0];
((unsigned long*)cipher->IV)[1] = t[1];
((unsigned long*)cipher->IV)[2] = t[2];
((unsigned long*)cipher->IV)[3] = t[3];
return inputLen;
default:
return BAD_CIPHER_STATE;
}
}
serpent_encrypt(unsigned long plaintext[4],
unsigned long ciphertext[4],
unsigned long subkeys[33][4])
{
register unsigned long x0, x1, x2, x3;
register unsigned long y0, y1, y2, y3;
x0=plaintext[0];
x1=plaintext[1];
x2=plaintext[2];
x3=plaintext[3];
/* Start to encrypt the plaintext x */
keying(x0, x1, x2, x3, subkeys[ 0]);
RND00(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[ 1]);
RND01(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[ 2]);
RND02(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[ 3]);
RND03(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[ 4]);
RND04(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[ 5]);
RND05(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[ 6]);
RND06(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[ 7]);
RND07(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[ 8]);
RND08(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[ 9]);
RND09(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[10]);
RND10(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[11]);
RND11(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[12]);
RND12(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[13]);
RND13(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[14]);
RND14(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[15]);
RND15(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[16]);
RND16(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[17]);
RND17(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[18]);
RND18(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[19]);
RND19(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[20]);
RND20(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[21]);
RND21(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[22]);
RND22(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[23]);
RND23(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[24]);
RND24(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[25]);
RND25(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[26]);
RND26(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[27]);
RND27(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[28]);
RND28(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[29]);
RND29(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[30]);
RND30(x0, x1, x2, x3, y0, y1, y2, y3);
transform(y0, y1, y2, y3, x0, x1, x2, x3);
keying(x0, x1, x2, x3, subkeys[31]);
RND31(x0, x1, x2, x3, y0, y1, y2, y3);
x0 = y0; x1 = y1; x2 = y2; x3 = y3;
keying(x0, x1, x2, x3, subkeys[32]);
/* The ciphertext is now in x */
ciphertext[0] = x0;
ciphertext[1] = x1;
ciphertext[2] = x2;
ciphertext[3] = x3;
}
serpent_decrypt(unsigned long ciphertext[4],
unsigned long plaintext[4],
unsigned long subkeys[33][4])
{
register unsigned long x0, x1, x2, x3;
register unsigned long y0, y1, y2, y3;
x0=ciphertext[0];
x1=ciphertext[1];
x2=ciphertext[2];
x3=ciphertext[3];
/* Start to decrypt the ciphertext x */
keying(x0, x1, x2, x3, subkeys[32]);
InvRND31(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[31]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND30(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[30]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND29(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[29]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND28(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[28]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND27(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[27]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND26(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[26]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND25(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[25]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND24(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[24]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND23(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[23]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND22(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[22]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND21(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[21]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND20(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[20]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND19(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[19]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND18(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[18]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND17(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[17]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND16(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[16]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND15(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[15]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND14(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[14]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND13(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[13]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND12(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[12]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND11(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[11]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND10(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[10]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND09(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[ 9]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND08(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[ 8]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND07(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[ 7]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND06(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[ 6]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND05(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[ 5]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND04(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[ 4]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND03(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[ 3]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND02(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[ 2]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND01(x0, x1, x2, x3, y0, y1, y2, y3);
keying(y0, y1, y2, y3, subkeys[ 1]);
inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
InvRND00(x0, x1, x2, x3, y0, y1, y2, y3);
x0 = y0; x1 = y1; x2 = y2; x3 = y3;
keying(x0, x1, x2, x3, subkeys[ 0]);
/* The plaintext is now in x */
plaintext[0] = x0;
plaintext[1] = x1;
plaintext[2] = x2;
plaintext[3] = x3;
}
#define min(x,y) (((x)<(y))?(x):(y))
int serpent_convert_from_string(int len, char *str, unsigned long *val)
/* the size of val must be at least the next multiple of 32 */
/* bits after len bits */
{
int is, iv;
int slen=min(strlen(str), (len+3)/4);
if(len<0)
return -1; /* Error!!! */
if(len>slen*4 || len'9')) &&
((str[is]<'A')||(str[is]>'F')) &&
((str[is]<'a')||(str[is]>'f')))
return -1; /* Error!!! */
for(is=slen, iv=0; is>=8; is-=8, iv++)
{
unsigned long t;
sscanf(&str[is-8], "%08lX", &t);
val[iv] = t;
}
if(is>0)
{
char tmp[10];
unsigned long t;
strncpy(tmp, str, is);
tmp[is] = 0;
sscanf(tmp, "%08lX", &t);
val[iv++] = t;
}
for(; iv<(len+31)/32; iv++)
val[iv] = 0;
return iv;
}
char *serpent_convert_to_string(int len, unsigned long val[8], char *str)
/* str must have at least (len+3)/4+1 bytes. */
{
int i;
if(len<0)
return (char *)-1; /* Error!!! */
str[0] = 0;
i=len/32;
if(len&31>0)
{
char tmp[10];
sprintf(tmp, "%08lX", val[i]&(((len&31)<<1)-1));
strcat(str, &tmp[8-(((len&31)+3)/4)]);
}
for(i--; i>=0; i--)
{
char tmp[10];
sprintf(tmp, "%08lX", val[i]);
strcat(str, tmp);
}
return str;
}