path: root/pppd/ppp-des.c

/*
 * ppp-des.c - PPP/DES implementation for MS-CHAP and EAP SRP-SHA1
 *
 * Extracted from chap_ms.c by James Carlson.
 * Added abstraction via PPP_Digest* callbacks by Eivind Næss
 *
 * Copyright (c) 1995 Eric Rosenquist. All rights reserved.
 * Copyright (c) 2022 Eivind Næss. All rights reserved.
 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above 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.
 *
 * 3. The name(s) of the authors of this software must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission.
 *
 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Sections of this code holds different copyright information.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stddef.h>
#include <stdlib.h>

#include "ppp-crypto-priv.h"

/*
 * DES related functions are imported from openssl 3.0 project with the 
 * follwoing license:
 *
 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */
typedef unsigned char DES_cblock[8];
#define DES_KEY_SZ      (sizeof(DES_cblock))

static const unsigned char odd_parity[256] = {
    1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
    16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
    32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
    49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
    64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
    81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
    97, 97, 98, 98, 100, 100, 103, 103, 104, 104, 107, 107, 109, 109, 110,
    110,
    112, 112, 115, 115, 117, 117, 118, 118, 121, 121, 122, 122, 124, 124, 127,
    127,
    128, 128, 131, 131, 133, 133, 134, 134, 137, 137, 138, 138, 140, 140, 143,
    143,
    145, 145, 146, 146, 148, 148, 151, 151, 152, 152, 155, 155, 157, 157, 158,
    158,
    161, 161, 162, 162, 164, 164, 167, 167, 168, 168, 171, 171, 173, 173, 174,
    174,
    176, 176, 179, 179, 181, 181, 182, 182, 185, 185, 186, 186, 188, 188, 191,
    191,
    193, 193, 194, 194, 196, 196, 199, 199, 200, 200, 203, 203, 205, 205, 206,
    206,
    208, 208, 211, 211, 213, 213, 214, 214, 217, 217, 218, 218, 220, 220, 223,
    223,
    224, 224, 227, 227, 229, 229, 230, 230, 233, 233, 234, 234, 236, 236, 239,
    239,
    241, 241, 242, 242, 244, 244, 247, 247, 248, 248, 251, 251, 253, 253, 254,
    254
};

static void DES_set_odd_parity(DES_cblock *key)
{
    unsigned int i;
    for (i = 0; i < DES_KEY_SZ; i++)
        (*key)[i] = odd_parity[(*key)[i]];
}

static unsigned char
Get7Bits(const unsigned char *input, int startBit)
{
	unsigned int word;

	word  = (unsigned)input[startBit / 8] << 8;
	word |= (unsigned)input[startBit / 8 + 1];

	word >>= 15 - (startBit % 8 + 7);

	return word & 0xFE;
}

static void
MakeKey(const unsigned char *key, unsigned char *des_key)
{
	/* key     IN  56 bit DES key missing parity bits */
	/* des_key OUT 64 bit DES key with parity bits added */
	des_key[0] = Get7Bits(key,  0);
	des_key[1] = Get7Bits(key,  7);
	des_key[2] = Get7Bits(key, 14);
	des_key[3] = Get7Bits(key, 21);
	des_key[4] = Get7Bits(key, 28);
	des_key[5] = Get7Bits(key, 35);
	des_key[6] = Get7Bits(key, 42);
	des_key[7] = Get7Bits(key, 49);

	DES_set_odd_parity((DES_cblock *)des_key);
}


#ifdef OPENSSL_HAVE_DES

#include <openssl/evp.h>

#if OPENSSL_VERSION_NUMBER < 0x10100000L
#define EVP_CIPHER_CTX_reset EVP_CIPHER_CTX_cleanup
#endif

static int des_init(PPP_CIPHER_CTX *ctx, const unsigned char *key, const unsigned char *iv)
{
    if (ctx) {
        EVP_CIPHER_CTX *cc = EVP_CIPHER_CTX_new();
        if (cc) {
            if (key) {
                MakeKey(key, ctx->key);
            }
            if (EVP_CipherInit(cc, EVP_des_ecb(), ctx->key, ctx->iv, ctx->is_encr)) {

                if (EVP_CIPHER_CTX_set_padding(cc, 0)) {
                    ctx->priv = cc;
                    return 1;
                }
            }
            EVP_CIPHER_CTX_free(cc);
        }
    }
    return 0;
}

static int des_update(PPP_CIPHER_CTX *ctx, unsigned char *out, int *outl, const unsigned char *in, int inl)
{
    if (ctx) {
        return EVP_CipherUpdate((EVP_CIPHER_CTX*) ctx->priv, out, outl, in, inl);
    }
    return 0;
}

static int des_final(PPP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
    if (ctx) {
        return EVP_CipherFinal((EVP_CIPHER_CTX*) ctx->priv, out, outl);
    }
    return 0;
}

static void des_clean(PPP_CIPHER_CTX *ctx)
{
    if (ctx->priv) {
        EVP_CIPHER_CTX_free((EVP_CIPHER_CTX*) ctx->priv);
        ctx->priv = NULL;
    }
}

/**
 * Using the EVP_ interface with openssl, there is no replacement for the
 * DES_set_key() function, and each iteration of DesEncrypt(Clear,Key,Cipher)
 * per RFC2759 is another iteration of the EVP_CipherInit, EVP_CipherUpdate,
 * EVP_CipherFinal functions.
 *
 * As a work-around, we reset the EVP_CIPHER_CTX object, and re-initializes
 * the context by calling EVP_CipherInit() with the new key.
 */
static void des_set_key(PPP_CIPHER_CTX *ctx, const unsigned char *key)
{
    EVP_CIPHER_CTX_reset((EVP_CIPHER_CTX*) ctx->priv);
    MakeKey(key, ctx->key);
    EVP_CipherInit((EVP_CIPHER_CTX*) ctx->priv, EVP_des_ecb(), ctx->key, ctx->iv, ctx->is_encr);
}

#else

/*
 * DES related functions are imported from openssl 3.0 project with the 
 * follwoing license:
 *
 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

typedef unsigned int DES_LONG;
typedef unsigned char DES_cblock[8];
typedef struct DES_ks {
    union {
        DES_cblock cblock;
        /*
         * make sure things are correct size on machines with 8 byte longs
         */
        DES_LONG deslong[2];
    } ks[16];
} DES_key_schedule;


#define c2l(c,l)        (l =((DES_LONG)(*((c)++)))    , \
                         l|=((DES_LONG)(*((c)++)))<< 8L, \
                         l|=((DES_LONG)(*((c)++)))<<16L, \
                         l|=((DES_LONG)(*((c)++)))<<24L)

# define l2c(l,c)        (*((c)++)=(unsigned char)(((l)     )&0xff), \
                         *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
                         *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
                         *((c)++)=(unsigned char)(((l)>>24L)&0xff))

#define ITERATIONS 16

#define ROTATE(a,n)     (((a)>>(n))+((a)<<(32-(n))))

# define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
        (b)^=(t),\
        (a)^=((t)<<(n)))

#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
        (a)=(a)^(t)^(t>>(16-(n))))

# define IP(l,r) \
        { \
        register DES_LONG tt; \
        PERM_OP(r,l,tt, 4,0x0f0f0f0fL); \
        PERM_OP(l,r,tt,16,0x0000ffffL); \
        PERM_OP(r,l,tt, 2,0x33333333L); \
        PERM_OP(l,r,tt, 8,0x00ff00ffL); \
        PERM_OP(r,l,tt, 1,0x55555555L); \
        }

# define FP(l,r) \
        { \
        register DES_LONG tt; \
        PERM_OP(l,r,tt, 1,0x55555555L); \
        PERM_OP(r,l,tt, 8,0x00ff00ffL); \
        PERM_OP(l,r,tt, 2,0x33333333L); \
        PERM_OP(r,l,tt,16,0x0000ffffL); \
        PERM_OP(l,r,tt, 4,0x0f0f0f0fL); \
        }

#define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g)
#define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
        u=R^s[S  ]; \
        t=R^s[S+1]

#define D_ENCRYPT(LL,R,S) { \
        LOAD_DATA_tmp(R,S,u,t,E0,E1); \
        t=ROTATE(t,4); \
        LL^= \
            DES_SPtrans[0][(u>> 2L)&0x3f]^ \
            DES_SPtrans[2][(u>>10L)&0x3f]^ \
            DES_SPtrans[4][(u>>18L)&0x3f]^ \
            DES_SPtrans[6][(u>>26L)&0x3f]^ \
            DES_SPtrans[1][(t>> 2L)&0x3f]^ \
            DES_SPtrans[3][(t>>10L)&0x3f]^ \
            DES_SPtrans[5][(t>>18L)&0x3f]^ \
            DES_SPtrans[7][(t>>26L)&0x3f]; }


static const DES_LONG DES_SPtrans[8][64] = {
    {
        /* nibble 0 */
        0x02080800L, 0x00080000L, 0x02000002L, 0x02080802L,
        0x02000000L, 0x00080802L, 0x00080002L, 0x02000002L,
        0x00080802L, 0x02080800L, 0x02080000L, 0x00000802L,
        0x02000802L, 0x02000000L, 0x00000000L, 0x00080002L,
        0x00080000L, 0x00000002L, 0x02000800L, 0x00080800L,
        0x02080802L, 0x02080000L, 0x00000802L, 0x02000800L,
        0x00000002L, 0x00000800L, 0x00080800L, 0x02080002L,
        0x00000800L, 0x02000802L, 0x02080002L, 0x00000000L,
        0x00000000L, 0x02080802L, 0x02000800L, 0x00080002L,
        0x02080800L, 0x00080000L, 0x00000802L, 0x02000800L,
        0x02080002L, 0x00000800L, 0x00080800L, 0x02000002L,
        0x00080802L, 0x00000002L, 0x02000002L, 0x02080000L,
        0x02080802L, 0x00080800L, 0x02080000L, 0x02000802L,
        0x02000000L, 0x00000802L, 0x00080002L, 0x00000000L,
        0x00080000L, 0x02000000L, 0x02000802L, 0x02080800L,
        0x00000002L, 0x02080002L, 0x00000800L, 0x00080802L,
    },
    {
        /* nibble 1 */
        0x40108010L, 0x00000000L, 0x00108000L, 0x40100000L,
        0x40000010L, 0x00008010L, 0x40008000L, 0x00108000L,
        0x00008000L, 0x40100010L, 0x00000010L, 0x40008000L,
        0x00100010L, 0x40108000L, 0x40100000L, 0x00000010L,
        0x00100000L, 0x40008010L, 0x40100010L, 0x00008000L,
        0x00108010L, 0x40000000L, 0x00000000L, 0x00100010L,
        0x40008010L, 0x00108010L, 0x40108000L, 0x40000010L,
        0x40000000L, 0x00100000L, 0x00008010L, 0x40108010L,
        0x00100010L, 0x40108000L, 0x40008000L, 0x00108010L,
        0x40108010L, 0x00100010L, 0x40000010L, 0x00000000L,
        0x40000000L, 0x00008010L, 0x00100000L, 0x40100010L,
        0x00008000L, 0x40000000L, 0x00108010L, 0x40008010L,
        0x40108000L, 0x00008000L, 0x00000000L, 0x40000010L,
        0x00000010L, 0x40108010L, 0x00108000L, 0x40100000L,
        0x40100010L, 0x00100000L, 0x00008010L, 0x40008000L,
        0x40008010L, 0x00000010L, 0x40100000L, 0x00108000L,
    },
    {
        /* nibble 2 */
        0x04000001L, 0x04040100L, 0x00000100L, 0x04000101L,
        0x00040001L, 0x04000000L, 0x04000101L, 0x00040100L,
        0x04000100L, 0x00040000L, 0x04040000L, 0x00000001L,
        0x04040101L, 0x00000101L, 0x00000001L, 0x04040001L,
        0x00000000L, 0x00040001L, 0x04040100L, 0x00000100L,
        0x00000101L, 0x04040101L, 0x00040000L, 0x04000001L,
        0x04040001L, 0x04000100L, 0x00040101L, 0x04040000L,
        0x00040100L, 0x00000000L, 0x04000000L, 0x00040101L,
        0x04040100L, 0x00000100L, 0x00000001L, 0x00040000L,
        0x00000101L, 0x00040001L, 0x04040000L, 0x04000101L,
        0x00000000L, 0x04040100L, 0x00040100L, 0x04040001L,
        0x00040001L, 0x04000000L, 0x04040101L, 0x00000001L,
        0x00040101L, 0x04000001L, 0x04000000L, 0x04040101L,
        0x00040000L, 0x04000100L, 0x04000101L, 0x00040100L,
        0x04000100L, 0x00000000L, 0x04040001L, 0x00000101L,
        0x04000001L, 0x00040101L, 0x00000100L, 0x04040000L,
    },
    {
        /* nibble 3 */
        0x00401008L, 0x10001000L, 0x00000008L, 0x10401008L,
        0x00000000L, 0x10400000L, 0x10001008L, 0x00400008L,
        0x10401000L, 0x10000008L, 0x10000000L, 0x00001008L,
        0x10000008L, 0x00401008L, 0x00400000L, 0x10000000L,
        0x10400008L, 0x00401000L, 0x00001000L, 0x00000008L,
        0x00401000L, 0x10001008L, 0x10400000L, 0x00001000L,
        0x00001008L, 0x00000000L, 0x00400008L, 0x10401000L,
        0x10001000L, 0x10400008L, 0x10401008L, 0x00400000L,
        0x10400008L, 0x00001008L, 0x00400000L, 0x10000008L,
        0x00401000L, 0x10001000L, 0x00000008L, 0x10400000L,
        0x10001008L, 0x00000000L, 0x00001000L, 0x00400008L,
        0x00000000L, 0x10400008L, 0x10401000L, 0x00001000L,
        0x10000000L, 0x10401008L, 0x00401008L, 0x00400000L,
        0x10401008L, 0x00000008L, 0x10001000L, 0x00401008L,
        0x00400008L, 0x00401000L, 0x10400000L, 0x10001008L,
        0x00001008L, 0x10000000L, 0x10000008L, 0x10401000L,
    },
    {
        /* nibble 4 */
        0x08000000L, 0x00010000L, 0x00000400L, 0x08010420L,
        0x08010020L, 0x08000400L, 0x00010420L, 0x08010000L,
        0x00010000L, 0x00000020L, 0x08000020L, 0x00010400L,
        0x08000420L, 0x08010020L, 0x08010400L, 0x00000000L,
        0x00010400L, 0x08000000L, 0x00010020L, 0x00000420L,
        0x08000400L, 0x00010420L, 0x00000000L, 0x08000020L,
        0x00000020L, 0x08000420L, 0x08010420L, 0x00010020L,
        0x08010000L, 0x00000400L, 0x00000420L, 0x08010400L,
        0x08010400L, 0x08000420L, 0x00010020L, 0x08010000L,
        0x00010000L, 0x00000020L, 0x08000020L, 0x08000400L,
        0x08000000L, 0x00010400L, 0x08010420L, 0x00000000L,
        0x00010420L, 0x08000000L, 0x00000400L, 0x00010020L,
        0x08000420L, 0x00000400L, 0x00000000L, 0x08010420L,
        0x08010020L, 0x08010400L, 0x00000420L, 0x00010000L,
        0x00010400L, 0x08010020L, 0x08000400L, 0x00000420L,
        0x00000020L, 0x00010420L, 0x08010000L, 0x08000020L,
    },
    {
        /* nibble 5 */
        0x80000040L, 0x00200040L, 0x00000000L, 0x80202000L,
        0x00200040L, 0x00002000L, 0x80002040L, 0x00200000L,
        0x00002040L, 0x80202040L, 0x00202000L, 0x80000000L,
        0x80002000L, 0x80000040L, 0x80200000L, 0x00202040L,
        0x00200000L, 0x80002040L, 0x80200040L, 0x00000000L,
        0x00002000L, 0x00000040L, 0x80202000L, 0x80200040L,
        0x80202040L, 0x80200000L, 0x80000000L, 0x00002040L,
        0x00000040L, 0x00202000L, 0x00202040L, 0x80002000L,
        0x00002040L, 0x80000000L, 0x80002000L, 0x00202040L,
        0x80202000L, 0x00200040L, 0x00000000L, 0x80002000L,
        0x80000000L, 0x00002000L, 0x80200040L, 0x00200000L,
        0x00200040L, 0x80202040L, 0x00202000L, 0x00000040L,
        0x80202040L, 0x00202000L, 0x00200000L, 0x80002040L,
        0x80000040L, 0x80200000L, 0x00202040L, 0x00000000L,
        0x00002000L, 0x80000040L, 0x80002040L, 0x80202000L,
        0x80200000L, 0x00002040L, 0x00000040L, 0x80200040L,
    },
    {
        /* nibble 6 */
        0x00004000L, 0x00000200L, 0x01000200L, 0x01000004L,
        0x01004204L, 0x00004004L, 0x00004200L, 0x00000000L,
        0x01000000L, 0x01000204L, 0x00000204L, 0x01004000L,
        0x00000004L, 0x01004200L, 0x01004000L, 0x00000204L,
        0x01000204L, 0x00004000L, 0x00004004L, 0x01004204L,
        0x00000000L, 0x01000200L, 0x01000004L, 0x00004200L,
        0x01004004L, 0x00004204L, 0x01004200L, 0x00000004L,
        0x00004204L, 0x01004004L, 0x00000200L, 0x01000000L,
        0x00004204L, 0x01004000L, 0x01004004L, 0x00000204L,
        0x00004000L, 0x00000200L, 0x01000000L, 0x01004004L,
        0x01000204L, 0x00004204L, 0x00004200L, 0x00000000L,
        0x00000200L, 0x01000004L, 0x00000004L, 0x01000200L,
        0x00000000L, 0x01000204L, 0x01000200L, 0x00004200L,
        0x00000204L, 0x00004000L, 0x01004204L, 0x01000000L,
        0x01004200L, 0x00000004L, 0x00004004L, 0x01004204L,
        0x01000004L, 0x01004200L, 0x01004000L, 0x00004004L,
    },
    {
        /* nibble 7 */
        0x20800080L, 0x20820000L, 0x00020080L, 0x00000000L,
        0x20020000L, 0x00800080L, 0x20800000L, 0x20820080L,
        0x00000080L, 0x20000000L, 0x00820000L, 0x00020080L,
        0x00820080L, 0x20020080L, 0x20000080L, 0x20800000L,
        0x00020000L, 0x00820080L, 0x00800080L, 0x20020000L,
        0x20820080L, 0x20000080L, 0x00000000L, 0x00820000L,
        0x20000000L, 0x00800000L, 0x20020080L, 0x20800080L,
        0x00800000L, 0x00020000L, 0x20820000L, 0x00000080L,
        0x00800000L, 0x00020000L, 0x20000080L, 0x20820080L,
        0x00020080L, 0x20000000L, 0x00000000L, 0x00820000L,
        0x20800080L, 0x20020080L, 0x20020000L, 0x00800080L,
        0x20820000L, 0x00000080L, 0x00800080L, 0x20020000L,
        0x20820080L, 0x00800000L, 0x20800000L, 0x20000080L,
        0x00820000L, 0x00020080L, 0x20020080L, 0x20800000L,
        0x00000080L, 0x20820000L, 0x00820080L, 0x00000000L,
        0x20000000L, 0x20800080L, 0x00020000L, 0x00820080L,
    }
};

static const DES_LONG des_skb[8][64] = {
    {
     /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
     0x00000000L, 0x00000010L, 0x20000000L, 0x20000010L,
     0x00010000L, 0x00010010L, 0x20010000L, 0x20010010L,
     0x00000800L, 0x00000810L, 0x20000800L, 0x20000810L,
     0x00010800L, 0x00010810L, 0x20010800L, 0x20010810L,
     0x00000020L, 0x00000030L, 0x20000020L, 0x20000030L,
     0x00010020L, 0x00010030L, 0x20010020L, 0x20010030L,
     0x00000820L, 0x00000830L, 0x20000820L, 0x20000830L,
     0x00010820L, 0x00010830L, 0x20010820L, 0x20010830L,
     0x00080000L, 0x00080010L, 0x20080000L, 0x20080010L,
     0x00090000L, 0x00090010L, 0x20090000L, 0x20090010L,
     0x00080800L, 0x00080810L, 0x20080800L, 0x20080810L,
     0x00090800L, 0x00090810L, 0x20090800L, 0x20090810L,
     0x00080020L, 0x00080030L, 0x20080020L, 0x20080030L,
     0x00090020L, 0x00090030L, 0x20090020L, 0x20090030L,
     0x00080820L, 0x00080830L, 0x20080820L, 0x20080830L,
     0x00090820L, 0x00090830L, 0x20090820L, 0x20090830L,
     },
    {
     /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
     0x00000000L, 0x02000000L, 0x00002000L, 0x02002000L,
     0x00200000L, 0x02200000L, 0x00202000L, 0x02202000L,
     0x00000004L, 0x02000004L, 0x00002004L, 0x02002004L,
     0x00200004L, 0x02200004L, 0x00202004L, 0x02202004L,
     0x00000400L, 0x02000400L, 0x00002400L, 0x02002400L,
     0x00200400L, 0x02200400L, 0x00202400L, 0x02202400L,
     0x00000404L, 0x02000404L, 0x00002404L, 0x02002404L,
     0x00200404L, 0x02200404L, 0x00202404L, 0x02202404L,
     0x10000000L, 0x12000000L, 0x10002000L, 0x12002000L,
     0x10200000L, 0x12200000L, 0x10202000L, 0x12202000L,
     0x10000004L, 0x12000004L, 0x10002004L, 0x12002004L,
     0x10200004L, 0x12200004L, 0x10202004L, 0x12202004L,
     0x10000400L, 0x12000400L, 0x10002400L, 0x12002400L,
     0x10200400L, 0x12200400L, 0x10202400L, 0x12202400L,
     0x10000404L, 0x12000404L, 0x10002404L, 0x12002404L,
     0x10200404L, 0x12200404L, 0x10202404L, 0x12202404L,
     },
    {
     /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
     0x00000000L, 0x00000001L, 0x00040000L, 0x00040001L,
     0x01000000L, 0x01000001L, 0x01040000L, 0x01040001L,
     0x00000002L, 0x00000003L, 0x00040002L, 0x00040003L,
     0x01000002L, 0x01000003L, 0x01040002L, 0x01040003L,
     0x00000200L, 0x00000201L, 0x00040200L, 0x00040201L,
     0x01000200L, 0x01000201L, 0x01040200L, 0x01040201L,
     0x00000202L, 0x00000203L, 0x00040202L, 0x00040203L,
     0x01000202L, 0x01000203L, 0x01040202L, 0x01040203L,
     0x08000000L, 0x08000001L, 0x08040000L, 0x08040001L,
     0x09000000L, 0x09000001L, 0x09040000L, 0x09040001L,
     0x08000002L, 0x08000003L, 0x08040002L, 0x08040003L,
     0x09000002L, 0x09000003L, 0x09040002L, 0x09040003L,
     0x08000200L, 0x08000201L, 0x08040200L, 0x08040201L,
     0x09000200L, 0x09000201L, 0x09040200L, 0x09040201L,
     0x08000202L, 0x08000203L, 0x08040202L, 0x08040203L,
     0x09000202L, 0x09000203L, 0x09040202L, 0x09040203L,
     },
    {
     /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
     0x00000000L, 0x00100000L, 0x00000100L, 0x00100100L,
     0x00000008L, 0x00100008L, 0x00000108L, 0x00100108L,
     0x00001000L, 0x00101000L, 0x00001100L, 0x00101100L,
     0x00001008L, 0x00101008L, 0x00001108L, 0x00101108L,
     0x04000000L, 0x04100000L, 0x04000100L, 0x04100100L,
     0x04000008L, 0x04100008L, 0x04000108L, 0x04100108L,
     0x04001000L, 0x04101000L, 0x04001100L, 0x04101100L,
     0x04001008L, 0x04101008L, 0x04001108L, 0x04101108L,
     0x00020000L, 0x00120000L, 0x00020100L, 0x00120100L,
     0x00020008L, 0x00120008L, 0x00020108L, 0x00120108L,
     0x00021000L, 0x00121000L, 0x00021100L, 0x00121100L,
     0x00021008L, 0x00121008L, 0x00021108L, 0x00121108L,
     0x04020000L, 0x04120000L, 0x04020100L, 0x04120100L,
     0x04020008L, 0x04120008L, 0x04020108L, 0x04120108L,
     0x04021000L, 0x04121000L, 0x04021100L, 0x04121100L,
     0x04021008L, 0x04121008L, 0x04021108L, 0x04121108L,
     },
    {
     /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
     0x00000000L, 0x10000000L, 0x00010000L, 0x10010000L,
     0x00000004L, 0x10000004L, 0x00010004L, 0x10010004L,
     0x20000000L, 0x30000000L, 0x20010000L, 0x30010000L,
     0x20000004L, 0x30000004L, 0x20010004L, 0x30010004L,
     0x00100000L, 0x10100000L, 0x00110000L, 0x10110000L,
     0x00100004L, 0x10100004L, 0x00110004L, 0x10110004L,
     0x20100000L, 0x30100000L, 0x20110000L, 0x30110000L,
     0x20100004L, 0x30100004L, 0x20110004L, 0x30110004L,
     0x00001000L, 0x10001000L, 0x00011000L, 0x10011000L,
     0x00001004L, 0x10001004L, 0x00011004L, 0x10011004L,
     0x20001000L, 0x30001000L, 0x20011000L, 0x30011000L,
     0x20001004L, 0x30001004L, 0x20011004L, 0x30011004L,
     0x00101000L, 0x10101000L, 0x00111000L, 0x10111000L,
     0x00101004L, 0x10101004L, 0x00111004L, 0x10111004L,
     0x20101000L, 0x30101000L, 0x20111000L, 0x30111000L,
     0x20101004L, 0x30101004L, 0x20111004L, 0x30111004L,
     },
    {   
     /* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
     0x00000000L, 0x08000000L, 0x00000008L, 0x08000008L,
     0x00000400L, 0x08000400L, 0x00000408L, 0x08000408L,
     0x00020000L, 0x08020000L, 0x00020008L, 0x08020008L,
     0x00020400L, 0x08020400L, 0x00020408L, 0x08020408L,
     0x00000001L, 0x08000001L, 0x00000009L, 0x08000009L,
     0x00000401L, 0x08000401L, 0x00000409L, 0x08000409L,
     0x00020001L, 0x08020001L, 0x00020009L, 0x08020009L,
     0x00020401L, 0x08020401L, 0x00020409L, 0x08020409L,
     0x02000000L, 0x0A000000L, 0x02000008L, 0x0A000008L,
     0x02000400L, 0x0A000400L, 0x02000408L, 0x0A000408L,
     0x02020000L, 0x0A020000L, 0x02020008L, 0x0A020008L,
     0x02020400L, 0x0A020400L, 0x02020408L, 0x0A020408L,
     0x02000001L, 0x0A000001L, 0x02000009L, 0x0A000009L,
     0x02000401L, 0x0A000401L, 0x02000409L, 0x0A000409L,
     0x02020001L, 0x0A020001L, 0x02020009L, 0x0A020009L,
     0x02020401L, 0x0A020401L, 0x02020409L, 0x0A020409L,
     },
    {
     /* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
     0x00000000L, 0x00000100L, 0x00080000L, 0x00080100L,
     0x01000000L, 0x01000100L, 0x01080000L, 0x01080100L,
     0x00000010L, 0x00000110L, 0x00080010L, 0x00080110L,
     0x01000010L, 0x01000110L, 0x01080010L, 0x01080110L,
     0x00200000L, 0x00200100L, 0x00280000L, 0x00280100L,
     0x01200000L, 0x01200100L, 0x01280000L, 0x01280100L,
     0x00200010L, 0x00200110L, 0x00280010L, 0x00280110L,
     0x01200010L, 0x01200110L, 0x01280010L, 0x01280110L,
     0x00000200L, 0x00000300L, 0x00080200L, 0x00080300L,
     0x01000200L, 0x01000300L, 0x01080200L, 0x01080300L,
     0x00000210L, 0x00000310L, 0x00080210L, 0x00080310L,
     0x01000210L, 0x01000310L, 0x01080210L, 0x01080310L,
     0x00200200L, 0x00200300L, 0x00280200L, 0x00280300L,
     0x01200200L, 0x01200300L, 0x01280200L, 0x01280300L,
     0x00200210L, 0x00200310L, 0x00280210L, 0x00280310L,
     0x01200210L, 0x01200310L, 0x01280210L, 0x01280310L,
     },
    {
     /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
     0x00000000L, 0x04000000L, 0x00040000L, 0x04040000L,
     0x00000002L, 0x04000002L, 0x00040002L, 0x04040002L,
     0x00002000L, 0x04002000L, 0x00042000L, 0x04042000L,
     0x00002002L, 0x04002002L, 0x00042002L, 0x04042002L,
     0x00000020L, 0x04000020L, 0x00040020L, 0x04040020L,
     0x00000022L, 0x04000022L, 0x00040022L, 0x04040022L,
     0x00002020L, 0x04002020L, 0x00042020L, 0x04042020L,
     0x00002022L, 0x04002022L, 0x00042022L, 0x04042022L,
     0x00000800L, 0x04000800L, 0x00040800L, 0x04040800L,
     0x00000802L, 0x04000802L, 0x00040802L, 0x04040802L,
     0x00002800L, 0x04002800L, 0x00042800L, 0x04042800L,
     0x00002802L, 0x04002802L, 0x00042802L, 0x04042802L,
     0x00000820L, 0x04000820L, 0x00040820L, 0x04040820L,
     0x00000822L, 0x04000822L, 0x00040822L, 0x04040822L,
     0x00002820L, 0x04002820L, 0x00042820L, 0x04042820L,
     0x00002822L, 0x04002822L, 0x00042822L, 0x04042822L,
     }
};


static void DES_encrypt1(DES_LONG *data, DES_key_schedule *ks, int enc)
{
    register DES_LONG l, r, t, u;
    register DES_LONG *s; 

    r = data[0];
    l = data[1];

    IP(r, l); 
    /*  
     * 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 for pointing this out.
     */
    /* clear the top bits on machines with 8byte longs */
    /* shift left by 2 */
    r = ROTATE(r, 29) & 0xffffffffL;
    l = ROTATE(l, 29) & 0xffffffffL;

    s = ks->ks->deslong;
    /*  
     * I don't know if it is worth the effort of loop unrolling the inner
     * loop
     */
    if (enc) {
        D_ENCRYPT(l, r, 0);     /* 1 */
        D_ENCRYPT(r, l, 2);     /* 2 */
        D_ENCRYPT(l, r, 4);     /* 3 */
        D_ENCRYPT(r, l, 6);     /* 4 */
        D_ENCRYPT(l, r, 8);     /* 5 */
        D_ENCRYPT(r, l, 10);    /* 6 */
        D_ENCRYPT(l, r, 12);    /* 7 */
        D_ENCRYPT(r, l, 14);    /* 8 */
        D_ENCRYPT(l, r, 16);    /* 9 */
        D_ENCRYPT(r, l, 18);    /* 10 */
        D_ENCRYPT(l, r, 20);    /* 11 */
        D_ENCRYPT(r, l, 22);    /* 12 */
        D_ENCRYPT(l, r, 24);    /* 13 */
        D_ENCRYPT(r, l, 26);    /* 14 */
        D_ENCRYPT(l, r, 28);    /* 15 */
        D_ENCRYPT(r, l, 30);    /* 16 */
    } else {
        D_ENCRYPT(l, r, 30);    /* 16 */
        D_ENCRYPT(r, l, 28);    /* 15 */
        D_ENCRYPT(l, r, 26);    /* 14 */
        D_ENCRYPT(r, l, 24);    /* 13 */
        D_ENCRYPT(l, r, 22);    /* 12 */
        D_ENCRYPT(r, l, 20);    /* 11 */
        D_ENCRYPT(l, r, 18);    /* 10 */
        D_ENCRYPT(r, l, 16);    /* 9 */
        D_ENCRYPT(l, r, 14);    /* 8 */
        D_ENCRYPT(r, l, 12);    /* 7 */
        D_ENCRYPT(l, r, 10);    /* 6 */
        D_ENCRYPT(r, l, 8);     /* 5 */
        D_ENCRYPT(l, r, 6);     /* 4 */
        D_ENCRYPT(r, l, 4);     /* 3 */
        D_ENCRYPT(l, r, 2);     /* 2 */
        D_ENCRYPT(r, l, 0);     /* 1 */
    }   

    /* rotate and clear the top bits on machines with 8byte longs */
    l = ROTATE(l, 3) & 0xffffffffL;
    r = ROTATE(r, 3) & 0xffffffffL;

    FP(r, l); 
    data[0] = l;
    data[1] = r;
    l = r = t = u = 0;
}


static void DES_ecb_encrypt(const DES_cblock *input, DES_cblock *output,
                     DES_key_schedule *ks, int enc)
{
    register DES_LONG l;
    DES_LONG ll[2];
    const unsigned char *in = &(*input)[0];
    unsigned char *out = &(*output)[0];

    c2l(in, l); 
    ll[0] = l;
    c2l(in, l); 
    ll[1] = l;
    DES_encrypt1(ll, ks, enc);
    l = ll[0];
    l2c(l, out);
    l = ll[1];
    l2c(l, out);
    l = ll[0] = ll[1] = 0;
}


static void DES_set_key(const DES_cblock *key, DES_key_schedule *schedule)
{
    static const int shifts2[16] =
        { 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0 };
    register DES_LONG c, d, t, s, t2;
    register const unsigned char *in;
    register DES_LONG *k;
    register int i;

#ifdef OPENBSD_DEV_CRYPTO
    memcpy(schedule->key, key, sizeof(schedule->key));
    schedule->session = NULL;
#endif
    k = &schedule->ks->deslong[0];
    in = &(*key)[0];

    c2l(in, c);
    c2l(in, d);

    /*
     * do PC1 in 47 simple operations. Thanks to John Fletcher
     * for the inspiration.
     */
    PERM_OP(d, c, t, 4, 0x0f0f0f0fL);
    HPERM_OP(c, t, -2, 0xcccc0000L);
    HPERM_OP(d, t, -2, 0xcccc0000L);
    PERM_OP(d, c, t, 1, 0x55555555L);
    PERM_OP(c, d, t, 8, 0x00ff00ffL);
    PERM_OP(d, c, t, 1, 0x55555555L);
    d = (((d & 0x000000ffL) << 16L) | (d & 0x0000ff00L) |
         ((d & 0x00ff0000L) >> 16L) | ((c & 0xf0000000L) >> 4L));
    c &= 0x0fffffffL;

    for (i = 0; i < ITERATIONS; i++) {
        if (shifts2[i]) {
            c = ((c >> 2L) | (c << 26L));
            d = ((d >> 2L) | (d << 26L));
        } else {
            c = ((c >> 1L) | (c << 27L));
            d = ((d >> 1L) | (d << 27L));
        }
        c &= 0x0fffffffL;
        d &= 0x0fffffffL;
        /*
         * 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 >> 6L) & 0x03) | ((c >> 7L) & 0x3c)] |
            des_skb[2][((c >> 13L) & 0x0f) | ((c >> 14L) & 0x30)] |
            des_skb[3][((c >> 20L) & 0x01) | ((c >> 21L) & 0x06) |
                       ((c >> 22L) & 0x38)];
        t = des_skb[4][(d) & 0x3f] |
            des_skb[5][((d >> 7L) & 0x03) | ((d >> 8L) & 0x3c)] |
            des_skb[6][(d >> 15L) & 0x3f] |
            des_skb[7][((d >> 21L) & 0x0f) | ((d >> 22L) & 0x30)];

        /* table contained 0213 4657 */
        t2 = ((t << 16L) | (s & 0x0000ffffL)) & 0xffffffffL;
        *(k++) = ROTATE(t2, 30) & 0xffffffffL;

        t2 = ((s >> 16L) | (t & 0xffff0000L));
        *(k++) = ROTATE(t2, 26) & 0xffffffffL;
    }
}

/* End of import of OpenSSL DES encryption functions */

static int des_init(PPP_CIPHER_CTX *ctx, const unsigned char *key, const unsigned char *iv)
{
    DES_key_schedule *ks = calloc(1, sizeof(DES_key_schedule));
    if (ks) {

        if (key) {
            MakeKey(key, ctx->key);
            DES_set_key((DES_cblock*) &ctx->key, ks);
        }

        ctx->priv = ks;
        return 1;
    }

    return 0;
}

static int des_update(PPP_CIPHER_CTX *ctx, unsigned char *out, int *outl, const unsigned char *in, int inl)
{
    int offset = 0;
    inl = inl / 8;
    while (offset < inl) {
        DES_ecb_encrypt((DES_cblock *)in + offset, (DES_cblock *)out + offset,
            (DES_key_schedule*) ctx->priv, ctx->is_encr);
        offset ++;
    }

    *outl = offset * 8;
    return 1;
}

static int des_final(PPP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
    return 1;
}

static void des_clean(PPP_CIPHER_CTX *ctx)
{
    if (ctx->priv) {
        free(ctx->priv);
        ctx->priv = NULL;
    }
}

static void des_set_key(PPP_CIPHER_CTX *ctx, const unsigned char *key)
{
    MakeKey(key, ctx->key);
    DES_set_key((DES_cblock*) &ctx->key, (DES_key_schedule*) ctx->priv);
}

#endif

static PPP_CIPHER ppp_des = {
    .init_fn = des_init,
    .update_fn = des_update,
    .final_fn = des_final,
    .set_key_fn = des_set_key,
    .clean_fn = des_clean,
};

const PPP_CIPHER *PPP_des_ecb(void)
{
    return &ppp_des;
}