зеркало из https://github.com/github/putty.git
739 строки
26 KiB
C
739 строки
26 KiB
C
#include <assert.h>
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#include "ssh.h"
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/*
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DES implementation; 1995 Tatu Ylonen <ylo@cs.hut.fi>
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This implementation is derived from libdes-3.06, which is copyright
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(c) 1993 Eric Young, and distributed under the GNU GPL or the ARTISTIC licence
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(at the user's option). The original distribution can be found e.g. from
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ftp://ftp.dsi.unimi.it/pub/security/crypt/libdes/libdes-3.06.tar.gz.
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This implementation is distributed under the same terms. See
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libdes-README, libdes-ARTISTIC, and libdes-COPYING for more
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information.
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*/
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typedef struct
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{
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word32 key_schedule[32];
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} DESContext;
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/* Sets the des key for the context. Initializes the context. The least
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significant bit of each byte of the key is ignored as parity. */
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static void des_set_key(unsigned char *key, DESContext *ks);
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/* Encrypts 32 bits in l,r, and stores the result in output[0] and output[1].
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Performs encryption if encrypt is non-zero, and decryption if it is zero.
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The key context must have been initialized previously with des_set_key. */
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static void des_encrypt(word32 l, word32 r, word32 *output, DESContext *ks,
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int encrypt);
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/* Encrypts len bytes from src to dest in CBC modes. Len must be a multiple
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of 8. iv will be modified at end to a value suitable for continuing
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encryption. */
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static void des_cbc_encrypt(DESContext *ks, unsigned char *iv, unsigned char *dest,
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const unsigned char *src, unsigned int len);
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/* Decrypts len bytes from src to dest in CBC modes. Len must be a multiple
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of 8. iv will be modified at end to a value suitable for continuing
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decryption. */
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static void des_cbc_decrypt(DESContext *ks, unsigned char *iv, unsigned char *dest,
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const unsigned char *src, unsigned int len);
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/* Encrypts in CBC mode using triple-DES. */
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static void des_3cbc_encrypt(DESContext *ks1, unsigned char *iv1,
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DESContext *ks2, unsigned char *iv2,
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DESContext *ks3, unsigned char *iv3,
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unsigned char *dest, const unsigned char *src,
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unsigned int len);
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/* Decrypts in CBC mode using triple-DES. */
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static void des_3cbc_decrypt(DESContext *ks1, unsigned char *iv1,
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DESContext *ks2, unsigned char *iv2,
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DESContext *ks3, unsigned char *iv3,
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unsigned char *dest, const unsigned char *src,
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unsigned int len);
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#define GET_32BIT_LSB_FIRST(cp) \
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(((unsigned long)(unsigned char)(cp)[0]) | \
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((unsigned long)(unsigned char)(cp)[1] << 8) | \
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((unsigned long)(unsigned char)(cp)[2] << 16) | \
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((unsigned long)(unsigned char)(cp)[3] << 24))
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#define PUT_32BIT_LSB_FIRST(cp, value) do { \
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(cp)[0] = (value); \
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(cp)[1] = (value) >> 8; \
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(cp)[2] = (value) >> 16; \
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(cp)[3] = (value) >> 24; } while (0)
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/*
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DES implementation; 1995 Tatu Ylonen <ylo@cs.hut.fi>
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This implementation is derived from libdes-3.06, which is copyright
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(c) 1993 Eric Young, and distributed under the GNU GPL or the ARTISTIC licence
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(at the user's option). The original distribution can be found e.g. from
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ftp://ftp.dsi.unimi.it/pub/security/crypt/libdes/libdes-3.06.tar.gz.
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This implementation is distributed under the same terms. See
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libdes-README, libdes-ARTISTIC, and libdes-COPYING for more
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information.
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A description of the DES algorithm can be found in every modern book on
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cryptography and data security, including the following:
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Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994.
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Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
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Computer Security. Prentice-Hall, 1989.
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Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill,
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1994.
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*/
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/* Table for key generation. This used to be in sk.h. */
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/* Copyright (C) 1993 Eric Young - see README for more details */
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static const word32 des_skb[8][64]={
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/* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
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{ 0x00000000,0x00000010,0x20000000,0x20000010,
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0x00010000,0x00010010,0x20010000,0x20010010,
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0x00000800,0x00000810,0x20000800,0x20000810,
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0x00010800,0x00010810,0x20010800,0x20010810,
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0x00000020,0x00000030,0x20000020,0x20000030,
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0x00010020,0x00010030,0x20010020,0x20010030,
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0x00000820,0x00000830,0x20000820,0x20000830,
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0x00010820,0x00010830,0x20010820,0x20010830,
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0x00080000,0x00080010,0x20080000,0x20080010,
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0x00090000,0x00090010,0x20090000,0x20090010,
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0x00080800,0x00080810,0x20080800,0x20080810,
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0x00090800,0x00090810,0x20090800,0x20090810,
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0x00080020,0x00080030,0x20080020,0x20080030,
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0x00090020,0x00090030,0x20090020,0x20090030,
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0x00080820,0x00080830,0x20080820,0x20080830,
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0x00090820,0x00090830,0x20090820,0x20090830 },
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/* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
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{ 0x00000000,0x02000000,0x00002000,0x02002000,
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0x00200000,0x02200000,0x00202000,0x02202000,
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0x00000004,0x02000004,0x00002004,0x02002004,
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0x00200004,0x02200004,0x00202004,0x02202004,
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0x00000400,0x02000400,0x00002400,0x02002400,
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0x00200400,0x02200400,0x00202400,0x02202400,
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0x00000404,0x02000404,0x00002404,0x02002404,
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0x00200404,0x02200404,0x00202404,0x02202404,
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0x10000000,0x12000000,0x10002000,0x12002000,
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0x10200000,0x12200000,0x10202000,0x12202000,
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0x10000004,0x12000004,0x10002004,0x12002004,
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0x10200004,0x12200004,0x10202004,0x12202004,
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0x10000400,0x12000400,0x10002400,0x12002400,
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0x10200400,0x12200400,0x10202400,0x12202400,
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0x10000404,0x12000404,0x10002404,0x12002404,
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0x10200404,0x12200404,0x10202404,0x12202404 },
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/* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
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{ 0x00000000,0x00000001,0x00040000,0x00040001,
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0x01000000,0x01000001,0x01040000,0x01040001,
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0x00000002,0x00000003,0x00040002,0x00040003,
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0x01000002,0x01000003,0x01040002,0x01040003,
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0x00000200,0x00000201,0x00040200,0x00040201,
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0x01000200,0x01000201,0x01040200,0x01040201,
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0x00000202,0x00000203,0x00040202,0x00040203,
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0x01000202,0x01000203,0x01040202,0x01040203,
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0x08000000,0x08000001,0x08040000,0x08040001,
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0x09000000,0x09000001,0x09040000,0x09040001,
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0x08000002,0x08000003,0x08040002,0x08040003,
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0x09000002,0x09000003,0x09040002,0x09040003,
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0x08000200,0x08000201,0x08040200,0x08040201,
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0x09000200,0x09000201,0x09040200,0x09040201,
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0x08000202,0x08000203,0x08040202,0x08040203,
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0x09000202,0x09000203,0x09040202,0x09040203 },
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/* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
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{ 0x00000000,0x00100000,0x00000100,0x00100100,
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0x00000008,0x00100008,0x00000108,0x00100108,
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0x00001000,0x00101000,0x00001100,0x00101100,
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0x00001008,0x00101008,0x00001108,0x00101108,
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0x04000000,0x04100000,0x04000100,0x04100100,
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0x04000008,0x04100008,0x04000108,0x04100108,
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0x04001000,0x04101000,0x04001100,0x04101100,
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0x04001008,0x04101008,0x04001108,0x04101108,
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0x00020000,0x00120000,0x00020100,0x00120100,
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0x00020008,0x00120008,0x00020108,0x00120108,
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0x00021000,0x00121000,0x00021100,0x00121100,
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0x00021008,0x00121008,0x00021108,0x00121108,
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0x04020000,0x04120000,0x04020100,0x04120100,
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0x04020008,0x04120008,0x04020108,0x04120108,
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0x04021000,0x04121000,0x04021100,0x04121100,
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0x04021008,0x04121008,0x04021108,0x04121108 },
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/* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
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{ 0x00000000,0x10000000,0x00010000,0x10010000,
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0x00000004,0x10000004,0x00010004,0x10010004,
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0x20000000,0x30000000,0x20010000,0x30010000,
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0x20000004,0x30000004,0x20010004,0x30010004,
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0x00100000,0x10100000,0x00110000,0x10110000,
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0x00100004,0x10100004,0x00110004,0x10110004,
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0x20100000,0x30100000,0x20110000,0x30110000,
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0x20100004,0x30100004,0x20110004,0x30110004,
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0x00001000,0x10001000,0x00011000,0x10011000,
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0x00001004,0x10001004,0x00011004,0x10011004,
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0x20001000,0x30001000,0x20011000,0x30011000,
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0x20001004,0x30001004,0x20011004,0x30011004,
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0x00101000,0x10101000,0x00111000,0x10111000,
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0x00101004,0x10101004,0x00111004,0x10111004,
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0x20101000,0x30101000,0x20111000,0x30111000,
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0x20101004,0x30101004,0x20111004,0x30111004 },
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/* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
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{ 0x00000000,0x08000000,0x00000008,0x08000008,
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0x00000400,0x08000400,0x00000408,0x08000408,
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0x00020000,0x08020000,0x00020008,0x08020008,
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0x00020400,0x08020400,0x00020408,0x08020408,
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0x00000001,0x08000001,0x00000009,0x08000009,
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0x00000401,0x08000401,0x00000409,0x08000409,
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0x00020001,0x08020001,0x00020009,0x08020009,
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0x00020401,0x08020401,0x00020409,0x08020409,
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0x02000000,0x0A000000,0x02000008,0x0A000008,
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0x02000400,0x0A000400,0x02000408,0x0A000408,
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0x02020000,0x0A020000,0x02020008,0x0A020008,
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0x02020400,0x0A020400,0x02020408,0x0A020408,
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0x02000001,0x0A000001,0x02000009,0x0A000009,
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0x02000401,0x0A000401,0x02000409,0x0A000409,
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0x02020001,0x0A020001,0x02020009,0x0A020009,
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0x02020401,0x0A020401,0x02020409,0x0A020409 },
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/* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
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{ 0x00000000,0x00000100,0x00080000,0x00080100,
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0x01000000,0x01000100,0x01080000,0x01080100,
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0x00000010,0x00000110,0x00080010,0x00080110,
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0x01000010,0x01000110,0x01080010,0x01080110,
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0x00200000,0x00200100,0x00280000,0x00280100,
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0x01200000,0x01200100,0x01280000,0x01280100,
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0x00200010,0x00200110,0x00280010,0x00280110,
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0x01200010,0x01200110,0x01280010,0x01280110,
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0x00000200,0x00000300,0x00080200,0x00080300,
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0x01000200,0x01000300,0x01080200,0x01080300,
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0x00000210,0x00000310,0x00080210,0x00080310,
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0x01000210,0x01000310,0x01080210,0x01080310,
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0x00200200,0x00200300,0x00280200,0x00280300,
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0x01200200,0x01200300,0x01280200,0x01280300,
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0x00200210,0x00200310,0x00280210,0x00280310,
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0x01200210,0x01200310,0x01280210,0x01280310 },
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/* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
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{ 0x00000000,0x04000000,0x00040000,0x04040000,
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0x00000002,0x04000002,0x00040002,0x04040002,
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0x00002000,0x04002000,0x00042000,0x04042000,
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0x00002002,0x04002002,0x00042002,0x04042002,
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0x00000020,0x04000020,0x00040020,0x04040020,
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0x00000022,0x04000022,0x00040022,0x04040022,
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0x00002020,0x04002020,0x00042020,0x04042020,
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0x00002022,0x04002022,0x00042022,0x04042022,
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0x00000800,0x04000800,0x00040800,0x04040800,
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0x00000802,0x04000802,0x00040802,0x04040802,
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0x00002800,0x04002800,0x00042800,0x04042800,
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0x00002802,0x04002802,0x00042802,0x04042802,
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0x00000820,0x04000820,0x00040820,0x04040820,
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0x00000822,0x04000822,0x00040822,0x04040822,
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0x00002820,0x04002820,0x00042820,0x04042820,
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0x00002822,0x04002822,0x00042822,0x04042822 }
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};
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/* Tables used for executing des. This used to be in spr.h. */
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/* Copyright (C) 1993 Eric Young - see README for more details */
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static const word32 des_SPtrans[8][64]={
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/* nibble 0 */
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{ 0x00820200, 0x00020000, 0x80800000, 0x80820200,
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0x00800000, 0x80020200, 0x80020000, 0x80800000,
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0x80020200, 0x00820200, 0x00820000, 0x80000200,
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0x80800200, 0x00800000, 0x00000000, 0x80020000,
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0x00020000, 0x80000000, 0x00800200, 0x00020200,
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0x80820200, 0x00820000, 0x80000200, 0x00800200,
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0x80000000, 0x00000200, 0x00020200, 0x80820000,
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0x00000200, 0x80800200, 0x80820000, 0x00000000,
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0x00000000, 0x80820200, 0x00800200, 0x80020000,
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0x00820200, 0x00020000, 0x80000200, 0x00800200,
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0x80820000, 0x00000200, 0x00020200, 0x80800000,
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0x80020200, 0x80000000, 0x80800000, 0x00820000,
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0x80820200, 0x00020200, 0x00820000, 0x80800200,
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0x00800000, 0x80000200, 0x80020000, 0x00000000,
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0x00020000, 0x00800000, 0x80800200, 0x00820200,
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0x80000000, 0x80820000, 0x00000200, 0x80020200 },
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/* nibble 1 */
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{ 0x10042004, 0x00000000, 0x00042000, 0x10040000,
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0x10000004, 0x00002004, 0x10002000, 0x00042000,
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0x00002000, 0x10040004, 0x00000004, 0x10002000,
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0x00040004, 0x10042000, 0x10040000, 0x00000004,
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0x00040000, 0x10002004, 0x10040004, 0x00002000,
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0x00042004, 0x10000000, 0x00000000, 0x00040004,
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0x10002004, 0x00042004, 0x10042000, 0x10000004,
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0x10000000, 0x00040000, 0x00002004, 0x10042004,
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0x00040004, 0x10042000, 0x10002000, 0x00042004,
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0x10042004, 0x00040004, 0x10000004, 0x00000000,
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0x10000000, 0x00002004, 0x00040000, 0x10040004,
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0x00002000, 0x10000000, 0x00042004, 0x10002004,
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0x10042000, 0x00002000, 0x00000000, 0x10000004,
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0x00000004, 0x10042004, 0x00042000, 0x10040000,
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0x10040004, 0x00040000, 0x00002004, 0x10002000,
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0x10002004, 0x00000004, 0x10040000, 0x00042000 },
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/* nibble 2 */
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{ 0x41000000, 0x01010040, 0x00000040, 0x41000040,
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0x40010000, 0x01000000, 0x41000040, 0x00010040,
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0x01000040, 0x00010000, 0x01010000, 0x40000000,
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0x41010040, 0x40000040, 0x40000000, 0x41010000,
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0x00000000, 0x40010000, 0x01010040, 0x00000040,
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0x40000040, 0x41010040, 0x00010000, 0x41000000,
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0x41010000, 0x01000040, 0x40010040, 0x01010000,
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0x00010040, 0x00000000, 0x01000000, 0x40010040,
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0x01010040, 0x00000040, 0x40000000, 0x00010000,
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0x40000040, 0x40010000, 0x01010000, 0x41000040,
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0x00000000, 0x01010040, 0x00010040, 0x41010000,
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0x40010000, 0x01000000, 0x41010040, 0x40000000,
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0x40010040, 0x41000000, 0x01000000, 0x41010040,
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0x00010000, 0x01000040, 0x41000040, 0x00010040,
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0x01000040, 0x00000000, 0x41010000, 0x40000040,
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0x41000000, 0x40010040, 0x00000040, 0x01010000 },
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/* nibble 3 */
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{ 0x00100402, 0x04000400, 0x00000002, 0x04100402,
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0x00000000, 0x04100000, 0x04000402, 0x00100002,
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0x04100400, 0x04000002, 0x04000000, 0x00000402,
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0x04000002, 0x00100402, 0x00100000, 0x04000000,
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0x04100002, 0x00100400, 0x00000400, 0x00000002,
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0x00100400, 0x04000402, 0x04100000, 0x00000400,
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0x00000402, 0x00000000, 0x00100002, 0x04100400,
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0x04000400, 0x04100002, 0x04100402, 0x00100000,
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0x04100002, 0x00000402, 0x00100000, 0x04000002,
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0x00100400, 0x04000400, 0x00000002, 0x04100000,
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0x04000402, 0x00000000, 0x00000400, 0x00100002,
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0x00000000, 0x04100002, 0x04100400, 0x00000400,
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0x04000000, 0x04100402, 0x00100402, 0x00100000,
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0x04100402, 0x00000002, 0x04000400, 0x00100402,
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0x00100002, 0x00100400, 0x04100000, 0x04000402,
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0x00000402, 0x04000000, 0x04000002, 0x04100400 },
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/* nibble 4 */
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{ 0x02000000, 0x00004000, 0x00000100, 0x02004108,
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0x02004008, 0x02000100, 0x00004108, 0x02004000,
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0x00004000, 0x00000008, 0x02000008, 0x00004100,
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0x02000108, 0x02004008, 0x02004100, 0x00000000,
|
|
0x00004100, 0x02000000, 0x00004008, 0x00000108,
|
|
0x02000100, 0x00004108, 0x00000000, 0x02000008,
|
|
0x00000008, 0x02000108, 0x02004108, 0x00004008,
|
|
0x02004000, 0x00000100, 0x00000108, 0x02004100,
|
|
0x02004100, 0x02000108, 0x00004008, 0x02004000,
|
|
0x00004000, 0x00000008, 0x02000008, 0x02000100,
|
|
0x02000000, 0x00004100, 0x02004108, 0x00000000,
|
|
0x00004108, 0x02000000, 0x00000100, 0x00004008,
|
|
0x02000108, 0x00000100, 0x00000000, 0x02004108,
|
|
0x02004008, 0x02004100, 0x00000108, 0x00004000,
|
|
0x00004100, 0x02004008, 0x02000100, 0x00000108,
|
|
0x00000008, 0x00004108, 0x02004000, 0x02000008 },
|
|
|
|
/* nibble 5 */
|
|
{ 0x20000010, 0x00080010, 0x00000000, 0x20080800,
|
|
0x00080010, 0x00000800, 0x20000810, 0x00080000,
|
|
0x00000810, 0x20080810, 0x00080800, 0x20000000,
|
|
0x20000800, 0x20000010, 0x20080000, 0x00080810,
|
|
0x00080000, 0x20000810, 0x20080010, 0x00000000,
|
|
0x00000800, 0x00000010, 0x20080800, 0x20080010,
|
|
0x20080810, 0x20080000, 0x20000000, 0x00000810,
|
|
0x00000010, 0x00080800, 0x00080810, 0x20000800,
|
|
0x00000810, 0x20000000, 0x20000800, 0x00080810,
|
|
0x20080800, 0x00080010, 0x00000000, 0x20000800,
|
|
0x20000000, 0x00000800, 0x20080010, 0x00080000,
|
|
0x00080010, 0x20080810, 0x00080800, 0x00000010,
|
|
0x20080810, 0x00080800, 0x00080000, 0x20000810,
|
|
0x20000010, 0x20080000, 0x00080810, 0x00000000,
|
|
0x00000800, 0x20000010, 0x20000810, 0x20080800,
|
|
0x20080000, 0x00000810, 0x00000010, 0x20080010 },
|
|
|
|
/* nibble 6 */
|
|
{ 0x00001000, 0x00000080, 0x00400080, 0x00400001,
|
|
0x00401081, 0x00001001, 0x00001080, 0x00000000,
|
|
0x00400000, 0x00400081, 0x00000081, 0x00401000,
|
|
0x00000001, 0x00401080, 0x00401000, 0x00000081,
|
|
0x00400081, 0x00001000, 0x00001001, 0x00401081,
|
|
0x00000000, 0x00400080, 0x00400001, 0x00001080,
|
|
0x00401001, 0x00001081, 0x00401080, 0x00000001,
|
|
0x00001081, 0x00401001, 0x00000080, 0x00400000,
|
|
0x00001081, 0x00401000, 0x00401001, 0x00000081,
|
|
0x00001000, 0x00000080, 0x00400000, 0x00401001,
|
|
0x00400081, 0x00001081, 0x00001080, 0x00000000,
|
|
0x00000080, 0x00400001, 0x00000001, 0x00400080,
|
|
0x00000000, 0x00400081, 0x00400080, 0x00001080,
|
|
0x00000081, 0x00001000, 0x00401081, 0x00400000,
|
|
0x00401080, 0x00000001, 0x00001001, 0x00401081,
|
|
0x00400001, 0x00401080, 0x00401000, 0x00001001 },
|
|
|
|
/* nibble 7 */
|
|
{ 0x08200020, 0x08208000, 0x00008020, 0x00000000,
|
|
0x08008000, 0x00200020, 0x08200000, 0x08208020,
|
|
0x00000020, 0x08000000, 0x00208000, 0x00008020,
|
|
0x00208020, 0x08008020, 0x08000020, 0x08200000,
|
|
0x00008000, 0x00208020, 0x00200020, 0x08008000,
|
|
0x08208020, 0x08000020, 0x00000000, 0x00208000,
|
|
0x08000000, 0x00200000, 0x08008020, 0x08200020,
|
|
0x00200000, 0x00008000, 0x08208000, 0x00000020,
|
|
0x00200000, 0x00008000, 0x08000020, 0x08208020,
|
|
0x00008020, 0x08000000, 0x00000000, 0x00208000,
|
|
0x08200020, 0x08008020, 0x08008000, 0x00200020,
|
|
0x08208000, 0x00000020, 0x00200020, 0x08008000,
|
|
0x08208020, 0x00200000, 0x08200000, 0x08000020,
|
|
0x00208000, 0x00008020, 0x08008020, 0x08200000,
|
|
0x00000020, 0x08208000, 0x00208020, 0x00000000,
|
|
0x08000000, 0x08200020, 0x00008000, 0x00208020 }};
|
|
|
|
/* Some stuff that used to be in des_locl.h. Heavily modified. */
|
|
/* IP and FP
|
|
* The problem is more of a geometric problem that random bit fiddling.
|
|
0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6
|
|
8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4
|
|
16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2
|
|
24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0
|
|
|
|
32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7
|
|
40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5
|
|
48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3
|
|
56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1
|
|
|
|
The output has been subject to swaps of the form
|
|
0 1 -> 3 1 but the odd and even bits have been put into
|
|
2 3 2 0
|
|
different words. The main trick is to remember that
|
|
t=((l>>size)^r)&(mask);
|
|
r^=t;
|
|
l^=(t<<size);
|
|
can be used to swap and move bits between words.
|
|
|
|
So l = 0 1 2 3 r = 16 17 18 19
|
|
4 5 6 7 20 21 22 23
|
|
8 9 10 11 24 25 26 27
|
|
12 13 14 15 28 29 30 31
|
|
becomes (for size == 2 and mask == 0x3333)
|
|
t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19
|
|
6^20 7^21 -- -- 4 5 20 21 6 7 22 23
|
|
10^24 11^25 -- -- 8 9 24 25 10 11 24 25
|
|
14^28 15^29 -- -- 12 13 28 29 14 15 28 29
|
|
|
|
Thanks for hints from Richard Outerbridge - he told me IP&FP
|
|
could be done in 15 xor, 10 shifts and 5 ands.
|
|
When I finally started to think of the problem in 2D
|
|
I first got ~42 operations without xors. When I remembered
|
|
how to use xors :-) I got it to its final state.
|
|
*/
|
|
#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
|
|
(b)^=(t),\
|
|
(a)^=((t)<<(n)))
|
|
|
|
#define IP(l,r,t) \
|
|
PERM_OP(r,l,t, 4,0x0f0f0f0f); \
|
|
PERM_OP(l,r,t,16,0x0000ffff); \
|
|
PERM_OP(r,l,t, 2,0x33333333); \
|
|
PERM_OP(l,r,t, 8,0x00ff00ff); \
|
|
PERM_OP(r,l,t, 1,0x55555555);
|
|
|
|
#define FP(l,r,t) \
|
|
PERM_OP(l,r,t, 1,0x55555555); \
|
|
PERM_OP(r,l,t, 8,0x00ff00ff); \
|
|
PERM_OP(l,r,t, 2,0x33333333); \
|
|
PERM_OP(r,l,t,16,0x0000ffff); \
|
|
PERM_OP(l,r,t, 4,0x0f0f0f0f);
|
|
|
|
#define D_ENCRYPT(L,R,S) \
|
|
u=(R^s[S ]); \
|
|
t=R^s[S+1]; \
|
|
t=((t>>4)+(t<<28)); \
|
|
L^= des_SPtrans[1][(t )&0x3f]| \
|
|
des_SPtrans[3][(t>> 8)&0x3f]| \
|
|
des_SPtrans[5][(t>>16)&0x3f]| \
|
|
des_SPtrans[7][(t>>24)&0x3f]| \
|
|
des_SPtrans[0][(u )&0x3f]| \
|
|
des_SPtrans[2][(u>> 8)&0x3f]| \
|
|
des_SPtrans[4][(u>>16)&0x3f]| \
|
|
des_SPtrans[6][(u>>24)&0x3f];
|
|
|
|
/* This part is based on code that used to be in ecb_enc.c. */
|
|
/* Copyright (C) 1993 Eric Young - see README for more details */
|
|
|
|
static void des_encrypt(word32 l, word32 r, word32 *output, DESContext *ks,
|
|
int encrypt)
|
|
{
|
|
register word32 t,u;
|
|
register int i;
|
|
register word32 *s;
|
|
|
|
s = ks->key_schedule;
|
|
|
|
IP(l,r,t);
|
|
/* Things have been modified so that the initial rotate is
|
|
* done outside the loop. This required the
|
|
* des_SPtrans values in sp.h to be rotated 1 bit to the right.
|
|
* One perl script later and things have a 5% speed up on a sparc2.
|
|
* Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
|
|
* for pointing this out. */
|
|
t=(r<<1)|(r>>31);
|
|
r=(l<<1)|(l>>31);
|
|
l=t;
|
|
|
|
/* I don't know if it is worth the effort of loop unrolling the
|
|
* inner loop */
|
|
if (encrypt)
|
|
{
|
|
for (i=0; i<32; i+=4)
|
|
{
|
|
D_ENCRYPT(l,r,i+0); /* 1 */
|
|
D_ENCRYPT(r,l,i+2); /* 2 */
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (i=30; i>0; i-=4)
|
|
{
|
|
D_ENCRYPT(l,r,i-0); /* 16 */
|
|
D_ENCRYPT(r,l,i-2); /* 15 */
|
|
}
|
|
}
|
|
l=(l>>1)|(l<<31);
|
|
r=(r>>1)|(r<<31);
|
|
|
|
FP(r,l,t);
|
|
output[0]=l;
|
|
output[1]=r;
|
|
}
|
|
|
|
/* Code based on set_key.c. */
|
|
/* Copyright (C) 1993 Eric Young - see README for more details */
|
|
|
|
#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
|
|
(a)=(a)^(t)^(t>>(16-(n))))
|
|
|
|
static void des_set_key(unsigned char *key, DESContext *ks)
|
|
{
|
|
register word32 c, d, t, s, shifts;
|
|
register int i;
|
|
register word32 *schedule;
|
|
|
|
schedule = ks->key_schedule;
|
|
|
|
c = GET_32BIT_LSB_FIRST(key);
|
|
d = GET_32BIT_LSB_FIRST(key + 4);
|
|
|
|
/* I now do it in 47 simple operations :-)
|
|
* Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
|
|
* for the inspiration. :-) */
|
|
PERM_OP(d,c,t,4,0x0f0f0f0f);
|
|
HPERM_OP(c,t,-2,0xcccc0000);
|
|
HPERM_OP(d,t,-2,0xcccc0000);
|
|
PERM_OP(d,c,t,1,0x55555555);
|
|
PERM_OP(c,d,t,8,0x00ff00ff);
|
|
PERM_OP(d,c,t,1,0x55555555);
|
|
d = ((d & 0xff) << 16) | (d & 0xff00) |
|
|
((d >> 16) & 0xff) | ((c >> 4) & 0xf000000);
|
|
c&=0x0fffffff;
|
|
|
|
shifts = 0x7efc;
|
|
for (i=0; i < 16; i++)
|
|
{
|
|
if (shifts & 1)
|
|
{ c=((c>>2)|(c<<26)); d=((d>>2)|(d<<26)); }
|
|
else
|
|
{ c=((c>>1)|(c<<27)); d=((d>>1)|(d<<27)); }
|
|
shifts >>= 1;
|
|
c&=0x0fffffff;
|
|
d&=0x0fffffff;
|
|
|
|
/* could be a few less shifts but I am to lazy at this
|
|
* point in time to investigate */
|
|
|
|
s = des_skb[0][ (c )&0x3f ] |
|
|
des_skb[1][((c>> 6)&0x03)|((c>> 7)&0x3c)] |
|
|
des_skb[2][((c>>13)&0x0f)|((c>>14)&0x30)] |
|
|
des_skb[3][((c>>20)&0x01)|((c>>21)&0x06)|((c>>22)&0x38)];
|
|
|
|
t = des_skb[4][ (d )&0x3f ] |
|
|
des_skb[5][((d>> 7)&0x03)|((d>> 8)&0x3c)] |
|
|
des_skb[6][ (d>>15)&0x3f ] |
|
|
des_skb[7][((d>>21)&0x0f)|((d>>22)&0x30)];
|
|
|
|
/* table contained 0213 4657 */
|
|
*schedule++ = ((t << 16) | (s & 0xffff));
|
|
s = ((s >> 16) | (t & 0xffff0000));
|
|
*schedule++ = (s << 4) | (s >> 28);
|
|
}
|
|
}
|
|
|
|
static void des_cbc_encrypt(DESContext *ks, unsigned char *iv,
|
|
unsigned char *dest, const unsigned char *src,
|
|
unsigned int len)
|
|
{
|
|
word32 iv0, iv1, out[2];
|
|
unsigned int i;
|
|
|
|
assert((len & 7) == 0);
|
|
|
|
iv0 = GET_32BIT_LSB_FIRST(iv);
|
|
iv1 = GET_32BIT_LSB_FIRST(iv + 4);
|
|
|
|
for (i = 0; i < len; i += 8)
|
|
{
|
|
iv0 ^= GET_32BIT_LSB_FIRST(src + i);
|
|
iv1 ^= GET_32BIT_LSB_FIRST(src + i + 4);
|
|
des_encrypt(iv0, iv1, out, ks, 1);
|
|
iv0 = out[0];
|
|
iv1 = out[1];
|
|
PUT_32BIT_LSB_FIRST(dest + i, iv0);
|
|
PUT_32BIT_LSB_FIRST(dest + i + 4, iv1);
|
|
}
|
|
PUT_32BIT_LSB_FIRST(iv, iv0);
|
|
PUT_32BIT_LSB_FIRST(iv + 4, iv1);
|
|
}
|
|
|
|
static void des_cbc_decrypt(DESContext *ks, unsigned char *iv,
|
|
unsigned char *dest, const unsigned char *src,
|
|
unsigned int len)
|
|
{
|
|
word32 iv0, iv1, d0, d1, out[2];
|
|
unsigned int i;
|
|
|
|
assert((len & 7) == 0);
|
|
|
|
iv0 = GET_32BIT_LSB_FIRST(iv);
|
|
iv1 = GET_32BIT_LSB_FIRST(iv + 4);
|
|
|
|
for (i = 0; i < len; i += 8)
|
|
{
|
|
d0 = GET_32BIT_LSB_FIRST(src + i);
|
|
d1 = GET_32BIT_LSB_FIRST(src + i + 4);
|
|
des_encrypt(d0, d1, out, ks, 0);
|
|
iv0 ^= out[0];
|
|
iv1 ^= out[1];
|
|
PUT_32BIT_LSB_FIRST(dest + i, iv0);
|
|
PUT_32BIT_LSB_FIRST(dest + i + 4, iv1);
|
|
iv0 = d0;
|
|
iv1 = d1;
|
|
}
|
|
PUT_32BIT_LSB_FIRST(iv, iv0);
|
|
PUT_32BIT_LSB_FIRST(iv + 4, iv1);
|
|
}
|
|
|
|
static void des_3cbc_encrypt(DESContext *ks1, unsigned char *iv1,
|
|
DESContext *ks2, unsigned char *iv2,
|
|
DESContext *ks3, unsigned char *iv3,
|
|
unsigned char *dest, const unsigned char *src,
|
|
unsigned int len)
|
|
{
|
|
des_cbc_encrypt(ks1, iv1, dest, src, len);
|
|
des_cbc_decrypt(ks2, iv2, dest, dest, len);
|
|
des_cbc_encrypt(ks3, iv3, dest, dest, len);
|
|
}
|
|
|
|
static void des_3cbc_decrypt(DESContext *ks1, unsigned char *iv1,
|
|
DESContext *ks2, unsigned char *iv2,
|
|
DESContext *ks3, unsigned char *iv3,
|
|
unsigned char *dest, const unsigned char *src,
|
|
unsigned int len)
|
|
{
|
|
des_cbc_decrypt(ks3, iv3, dest, src, len);
|
|
des_cbc_encrypt(ks2, iv2, dest, dest, len);
|
|
des_cbc_decrypt(ks1, iv1, dest, dest, len);
|
|
}
|
|
|
|
DESContext ekey1, ekey2, ekey3;
|
|
unsigned char eiv1[8], eiv2[8], eiv3[8];
|
|
|
|
DESContext dkey1, dkey2, dkey3;
|
|
unsigned char div1[8], div2[8], div3[8];
|
|
|
|
static void des3_sesskey(unsigned char *key) {
|
|
des_set_key(key, &ekey1);
|
|
des_set_key(key+8, &ekey2);
|
|
des_set_key(key+16, &ekey3);
|
|
memset(eiv1, 0, sizeof(eiv1));
|
|
memset(eiv2, 0, sizeof(eiv2));
|
|
memset(eiv3, 0, sizeof(eiv3));
|
|
des_set_key(key, &dkey1);
|
|
des_set_key(key+8, &dkey2);
|
|
des_set_key(key+16, &dkey3);
|
|
memset(div1, 0, sizeof(div1));
|
|
memset(div2, 0, sizeof(div2));
|
|
memset(div3, 0, sizeof(div3));
|
|
}
|
|
|
|
static void des3_encrypt_blk(unsigned char *blk, int len) {
|
|
des_3cbc_encrypt(&ekey1, eiv1, &ekey2, eiv2, &ekey3, eiv3, blk, blk, len);
|
|
}
|
|
|
|
static void des3_decrypt_blk(unsigned char *blk, int len) {
|
|
des_3cbc_decrypt(&dkey1, div1, &dkey2, div2, &dkey3, div3, blk, blk, len);
|
|
}
|
|
|
|
struct ssh_cipher ssh_3des = {
|
|
des3_sesskey,
|
|
des3_encrypt_blk,
|
|
des3_decrypt_blk
|
|
};
|
|
|
|
#ifdef DES_TEST
|
|
|
|
void des_encrypt_buf(DESContext *ks, unsigned char *out,
|
|
const unsigned char *in, int encrypt)
|
|
{
|
|
word32 in0, in1, output[0];
|
|
|
|
in0 = GET_32BIT_LSB_FIRST(in);
|
|
in1 = GET_32BIT_LSB_FIRST(in + 4);
|
|
des_encrypt(in0, in1, output, ks, encrypt);
|
|
PUT_32BIT_LSB_FIRST(out, output[0]);
|
|
PUT_32BIT_LSB_FIRST(out + 4, output[1]);
|
|
}
|
|
|
|
int main(int ac, char **av)
|
|
{
|
|
FILE *f;
|
|
char line[1024], *cp;
|
|
int i, value;
|
|
unsigned char key[8], data[8], result[8], output[8];
|
|
DESContext ks;
|
|
|
|
while (fgets(line, sizeof(line), stdin))
|
|
{
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
if (sscanf(line + 2 * i, "%02x", &value) != 1)
|
|
{
|
|
fprintf(stderr, "1st col, i = %d, line: %s", i, line);
|
|
exit(1);
|
|
}
|
|
key[i] = value;
|
|
}
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
if (sscanf(line + 2 * i + 17, "%02x", &value) != 1)
|
|
{
|
|
fprintf(stderr, "2nd col, i = %d, line: %s", i, line);
|
|
exit(1);
|
|
}
|
|
data[i] = value;
|
|
}
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
if (sscanf(line + 2 * i + 2*17, "%02x", &value) != 1)
|
|
{
|
|
fprintf(stderr, "3rd col, i = %d, line: %s", i, line);
|
|
exit(1);
|
|
}
|
|
result[i] = value;
|
|
}
|
|
des_set_key(key, &ks);
|
|
des_encrypt_buf(&ks, output, data, 1);
|
|
if (memcmp(output, result, 8) != 0)
|
|
fprintf(stderr, "Encrypt failed: %s", line);
|
|
des_encrypt_buf(&ks, output, result, 0);
|
|
if (memcmp(output, data, 8) != 0)
|
|
fprintf(stderr, "Decrypt failed: %s", line);
|
|
}
|
|
exit(0);
|
|
}
|
|
#endif /* DES_TEST */
|
|
|