| /* |
| * FIPS-46-3 compliant Triple-DES implementation |
| * |
| * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine |
| * |
| * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org> |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the names of PolarSSL or XySSL nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "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 COPYRIGHT |
| * OWNER 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. |
| */ |
| /* |
| * DES, on which TDES is based, was originally designed by Horst Feistel |
| * at IBM in 1974, and was adopted as a standard by NIST (formerly NBS). |
| * |
| * http://csrc.nist.gov/publications/fips/fips46-3/fips46-3.pdf |
| */ |
| |
| #include "netif/ppp/ppp_opts.h" |
| #if PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_DES |
| |
| #include "netif/ppp/polarssl/des.h" |
| |
| /* |
| * 32-bit integer manipulation macros (big endian) |
| */ |
| #ifndef GET_ULONG_BE |
| #define GET_ULONG_BE(n,b,i) \ |
| { \ |
| (n) = ( (unsigned long) (b)[(i) ] << 24 ) \ |
| | ( (unsigned long) (b)[(i) + 1] << 16 ) \ |
| | ( (unsigned long) (b)[(i) + 2] << 8 ) \ |
| | ( (unsigned long) (b)[(i) + 3] ); \ |
| } |
| #endif |
| |
| #ifndef PUT_ULONG_BE |
| #define PUT_ULONG_BE(n,b,i) \ |
| { \ |
| (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \ |
| (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \ |
| (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \ |
| (b)[(i) + 3] = (unsigned char) ( (n) ); \ |
| } |
| #endif |
| |
| /* |
| * Expanded DES S-boxes |
| */ |
| static const unsigned long SB1[64] = |
| { |
| 0x01010400, 0x00000000, 0x00010000, 0x01010404, |
| 0x01010004, 0x00010404, 0x00000004, 0x00010000, |
| 0x00000400, 0x01010400, 0x01010404, 0x00000400, |
| 0x01000404, 0x01010004, 0x01000000, 0x00000004, |
| 0x00000404, 0x01000400, 0x01000400, 0x00010400, |
| 0x00010400, 0x01010000, 0x01010000, 0x01000404, |
| 0x00010004, 0x01000004, 0x01000004, 0x00010004, |
| 0x00000000, 0x00000404, 0x00010404, 0x01000000, |
| 0x00010000, 0x01010404, 0x00000004, 0x01010000, |
| 0x01010400, 0x01000000, 0x01000000, 0x00000400, |
| 0x01010004, 0x00010000, 0x00010400, 0x01000004, |
| 0x00000400, 0x00000004, 0x01000404, 0x00010404, |
| 0x01010404, 0x00010004, 0x01010000, 0x01000404, |
| 0x01000004, 0x00000404, 0x00010404, 0x01010400, |
| 0x00000404, 0x01000400, 0x01000400, 0x00000000, |
| 0x00010004, 0x00010400, 0x00000000, 0x01010004 |
| }; |
| |
| static const unsigned long SB2[64] = |
| { |
| 0x80108020, 0x80008000, 0x00008000, 0x00108020, |
| 0x00100000, 0x00000020, 0x80100020, 0x80008020, |
| 0x80000020, 0x80108020, 0x80108000, 0x80000000, |
| 0x80008000, 0x00100000, 0x00000020, 0x80100020, |
| 0x00108000, 0x00100020, 0x80008020, 0x00000000, |
| 0x80000000, 0x00008000, 0x00108020, 0x80100000, |
| 0x00100020, 0x80000020, 0x00000000, 0x00108000, |
| 0x00008020, 0x80108000, 0x80100000, 0x00008020, |
| 0x00000000, 0x00108020, 0x80100020, 0x00100000, |
| 0x80008020, 0x80100000, 0x80108000, 0x00008000, |
| 0x80100000, 0x80008000, 0x00000020, 0x80108020, |
| 0x00108020, 0x00000020, 0x00008000, 0x80000000, |
| 0x00008020, 0x80108000, 0x00100000, 0x80000020, |
| 0x00100020, 0x80008020, 0x80000020, 0x00100020, |
| 0x00108000, 0x00000000, 0x80008000, 0x00008020, |
| 0x80000000, 0x80100020, 0x80108020, 0x00108000 |
| }; |
| |
| static const unsigned long SB3[64] = |
| { |
| 0x00000208, 0x08020200, 0x00000000, 0x08020008, |
| 0x08000200, 0x00000000, 0x00020208, 0x08000200, |
| 0x00020008, 0x08000008, 0x08000008, 0x00020000, |
| 0x08020208, 0x00020008, 0x08020000, 0x00000208, |
| 0x08000000, 0x00000008, 0x08020200, 0x00000200, |
| 0x00020200, 0x08020000, 0x08020008, 0x00020208, |
| 0x08000208, 0x00020200, 0x00020000, 0x08000208, |
| 0x00000008, 0x08020208, 0x00000200, 0x08000000, |
| 0x08020200, 0x08000000, 0x00020008, 0x00000208, |
| 0x00020000, 0x08020200, 0x08000200, 0x00000000, |
| 0x00000200, 0x00020008, 0x08020208, 0x08000200, |
| 0x08000008, 0x00000200, 0x00000000, 0x08020008, |
| 0x08000208, 0x00020000, 0x08000000, 0x08020208, |
| 0x00000008, 0x00020208, 0x00020200, 0x08000008, |
| 0x08020000, 0x08000208, 0x00000208, 0x08020000, |
| 0x00020208, 0x00000008, 0x08020008, 0x00020200 |
| }; |
| |
| static const unsigned long SB4[64] = |
| { |
| 0x00802001, 0x00002081, 0x00002081, 0x00000080, |
| 0x00802080, 0x00800081, 0x00800001, 0x00002001, |
| 0x00000000, 0x00802000, 0x00802000, 0x00802081, |
| 0x00000081, 0x00000000, 0x00800080, 0x00800001, |
| 0x00000001, 0x00002000, 0x00800000, 0x00802001, |
| 0x00000080, 0x00800000, 0x00002001, 0x00002080, |
| 0x00800081, 0x00000001, 0x00002080, 0x00800080, |
| 0x00002000, 0x00802080, 0x00802081, 0x00000081, |
| 0x00800080, 0x00800001, 0x00802000, 0x00802081, |
| 0x00000081, 0x00000000, 0x00000000, 0x00802000, |
| 0x00002080, 0x00800080, 0x00800081, 0x00000001, |
| 0x00802001, 0x00002081, 0x00002081, 0x00000080, |
| 0x00802081, 0x00000081, 0x00000001, 0x00002000, |
| 0x00800001, 0x00002001, 0x00802080, 0x00800081, |
| 0x00002001, 0x00002080, 0x00800000, 0x00802001, |
| 0x00000080, 0x00800000, 0x00002000, 0x00802080 |
| }; |
| |
| static const unsigned long SB5[64] = |
| { |
| 0x00000100, 0x02080100, 0x02080000, 0x42000100, |
| 0x00080000, 0x00000100, 0x40000000, 0x02080000, |
| 0x40080100, 0x00080000, 0x02000100, 0x40080100, |
| 0x42000100, 0x42080000, 0x00080100, 0x40000000, |
| 0x02000000, 0x40080000, 0x40080000, 0x00000000, |
| 0x40000100, 0x42080100, 0x42080100, 0x02000100, |
| 0x42080000, 0x40000100, 0x00000000, 0x42000000, |
| 0x02080100, 0x02000000, 0x42000000, 0x00080100, |
| 0x00080000, 0x42000100, 0x00000100, 0x02000000, |
| 0x40000000, 0x02080000, 0x42000100, 0x40080100, |
| 0x02000100, 0x40000000, 0x42080000, 0x02080100, |
| 0x40080100, 0x00000100, 0x02000000, 0x42080000, |
| 0x42080100, 0x00080100, 0x42000000, 0x42080100, |
| 0x02080000, 0x00000000, 0x40080000, 0x42000000, |
| 0x00080100, 0x02000100, 0x40000100, 0x00080000, |
| 0x00000000, 0x40080000, 0x02080100, 0x40000100 |
| }; |
| |
| static const unsigned long SB6[64] = |
| { |
| 0x20000010, 0x20400000, 0x00004000, 0x20404010, |
| 0x20400000, 0x00000010, 0x20404010, 0x00400000, |
| 0x20004000, 0x00404010, 0x00400000, 0x20000010, |
| 0x00400010, 0x20004000, 0x20000000, 0x00004010, |
| 0x00000000, 0x00400010, 0x20004010, 0x00004000, |
| 0x00404000, 0x20004010, 0x00000010, 0x20400010, |
| 0x20400010, 0x00000000, 0x00404010, 0x20404000, |
| 0x00004010, 0x00404000, 0x20404000, 0x20000000, |
| 0x20004000, 0x00000010, 0x20400010, 0x00404000, |
| 0x20404010, 0x00400000, 0x00004010, 0x20000010, |
| 0x00400000, 0x20004000, 0x20000000, 0x00004010, |
| 0x20000010, 0x20404010, 0x00404000, 0x20400000, |
| 0x00404010, 0x20404000, 0x00000000, 0x20400010, |
| 0x00000010, 0x00004000, 0x20400000, 0x00404010, |
| 0x00004000, 0x00400010, 0x20004010, 0x00000000, |
| 0x20404000, 0x20000000, 0x00400010, 0x20004010 |
| }; |
| |
| static const unsigned long SB7[64] = |
| { |
| 0x00200000, 0x04200002, 0x04000802, 0x00000000, |
| 0x00000800, 0x04000802, 0x00200802, 0x04200800, |
| 0x04200802, 0x00200000, 0x00000000, 0x04000002, |
| 0x00000002, 0x04000000, 0x04200002, 0x00000802, |
| 0x04000800, 0x00200802, 0x00200002, 0x04000800, |
| 0x04000002, 0x04200000, 0x04200800, 0x00200002, |
| 0x04200000, 0x00000800, 0x00000802, 0x04200802, |
| 0x00200800, 0x00000002, 0x04000000, 0x00200800, |
| 0x04000000, 0x00200800, 0x00200000, 0x04000802, |
| 0x04000802, 0x04200002, 0x04200002, 0x00000002, |
| 0x00200002, 0x04000000, 0x04000800, 0x00200000, |
| 0x04200800, 0x00000802, 0x00200802, 0x04200800, |
| 0x00000802, 0x04000002, 0x04200802, 0x04200000, |
| 0x00200800, 0x00000000, 0x00000002, 0x04200802, |
| 0x00000000, 0x00200802, 0x04200000, 0x00000800, |
| 0x04000002, 0x04000800, 0x00000800, 0x00200002 |
| }; |
| |
| static const unsigned long SB8[64] = |
| { |
| 0x10001040, 0x00001000, 0x00040000, 0x10041040, |
| 0x10000000, 0x10001040, 0x00000040, 0x10000000, |
| 0x00040040, 0x10040000, 0x10041040, 0x00041000, |
| 0x10041000, 0x00041040, 0x00001000, 0x00000040, |
| 0x10040000, 0x10000040, 0x10001000, 0x00001040, |
| 0x00041000, 0x00040040, 0x10040040, 0x10041000, |
| 0x00001040, 0x00000000, 0x00000000, 0x10040040, |
| 0x10000040, 0x10001000, 0x00041040, 0x00040000, |
| 0x00041040, 0x00040000, 0x10041000, 0x00001000, |
| 0x00000040, 0x10040040, 0x00001000, 0x00041040, |
| 0x10001000, 0x00000040, 0x10000040, 0x10040000, |
| 0x10040040, 0x10000000, 0x00040000, 0x10001040, |
| 0x00000000, 0x10041040, 0x00040040, 0x10000040, |
| 0x10040000, 0x10001000, 0x10001040, 0x00000000, |
| 0x10041040, 0x00041000, 0x00041000, 0x00001040, |
| 0x00001040, 0x00040040, 0x10000000, 0x10041000 |
| }; |
| |
| /* |
| * PC1: left and right halves bit-swap |
| */ |
| static const unsigned long LHs[16] = |
| { |
| 0x00000000, 0x00000001, 0x00000100, 0x00000101, |
| 0x00010000, 0x00010001, 0x00010100, 0x00010101, |
| 0x01000000, 0x01000001, 0x01000100, 0x01000101, |
| 0x01010000, 0x01010001, 0x01010100, 0x01010101 |
| }; |
| |
| static const unsigned long RHs[16] = |
| { |
| 0x00000000, 0x01000000, 0x00010000, 0x01010000, |
| 0x00000100, 0x01000100, 0x00010100, 0x01010100, |
| 0x00000001, 0x01000001, 0x00010001, 0x01010001, |
| 0x00000101, 0x01000101, 0x00010101, 0x01010101, |
| }; |
| |
| /* |
| * Initial Permutation macro |
| */ |
| #define DES_IP(X,Y) \ |
| { \ |
| T = ((X >> 4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T << 4); \ |
| T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16); \ |
| T = ((Y >> 2) ^ X) & 0x33333333; X ^= T; Y ^= (T << 2); \ |
| T = ((Y >> 8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T << 8); \ |
| Y = ((Y << 1) | (Y >> 31)) & 0xFFFFFFFF; \ |
| T = (X ^ Y) & 0xAAAAAAAA; Y ^= T; X ^= T; \ |
| X = ((X << 1) | (X >> 31)) & 0xFFFFFFFF; \ |
| } |
| |
| /* |
| * Final Permutation macro |
| */ |
| #define DES_FP(X,Y) \ |
| { \ |
| X = ((X << 31) | (X >> 1)) & 0xFFFFFFFF; \ |
| T = (X ^ Y) & 0xAAAAAAAA; X ^= T; Y ^= T; \ |
| Y = ((Y << 31) | (Y >> 1)) & 0xFFFFFFFF; \ |
| T = ((Y >> 8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T << 8); \ |
| T = ((Y >> 2) ^ X) & 0x33333333; X ^= T; Y ^= (T << 2); \ |
| T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16); \ |
| T = ((X >> 4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T << 4); \ |
| } |
| |
| /* |
| * DES round macro |
| */ |
| #define DES_ROUND(X,Y) \ |
| { \ |
| T = *SK++ ^ X; \ |
| Y ^= SB8[ (T ) & 0x3F ] ^ \ |
| SB6[ (T >> 8) & 0x3F ] ^ \ |
| SB4[ (T >> 16) & 0x3F ] ^ \ |
| SB2[ (T >> 24) & 0x3F ]; \ |
| \ |
| T = *SK++ ^ ((X << 28) | (X >> 4)); \ |
| Y ^= SB7[ (T ) & 0x3F ] ^ \ |
| SB5[ (T >> 8) & 0x3F ] ^ \ |
| SB3[ (T >> 16) & 0x3F ] ^ \ |
| SB1[ (T >> 24) & 0x3F ]; \ |
| } |
| |
| #define SWAP(a,b) { unsigned long t = a; a = b; b = t; t = 0; } |
| |
| static void des_setkey( unsigned long SK[32], unsigned char key[8] ) |
| { |
| int i; |
| unsigned long X, Y, T; |
| |
| GET_ULONG_BE( X, key, 0 ); |
| GET_ULONG_BE( Y, key, 4 ); |
| |
| /* |
| * Permuted Choice 1 |
| */ |
| T = ((Y >> 4) ^ X) & 0x0F0F0F0F; X ^= T; Y ^= (T << 4); |
| T = ((Y ) ^ X) & 0x10101010; X ^= T; Y ^= (T ); |
| |
| X = (LHs[ (X ) & 0xF] << 3) | (LHs[ (X >> 8) & 0xF ] << 2) |
| | (LHs[ (X >> 16) & 0xF] << 1) | (LHs[ (X >> 24) & 0xF ] ) |
| | (LHs[ (X >> 5) & 0xF] << 7) | (LHs[ (X >> 13) & 0xF ] << 6) |
| | (LHs[ (X >> 21) & 0xF] << 5) | (LHs[ (X >> 29) & 0xF ] << 4); |
| |
| Y = (RHs[ (Y >> 1) & 0xF] << 3) | (RHs[ (Y >> 9) & 0xF ] << 2) |
| | (RHs[ (Y >> 17) & 0xF] << 1) | (RHs[ (Y >> 25) & 0xF ] ) |
| | (RHs[ (Y >> 4) & 0xF] << 7) | (RHs[ (Y >> 12) & 0xF ] << 6) |
| | (RHs[ (Y >> 20) & 0xF] << 5) | (RHs[ (Y >> 28) & 0xF ] << 4); |
| |
| X &= 0x0FFFFFFF; |
| Y &= 0x0FFFFFFF; |
| |
| /* |
| * calculate subkeys |
| */ |
| for( i = 0; i < 16; i++ ) |
| { |
| if( i < 2 || i == 8 || i == 15 ) |
| { |
| X = ((X << 1) | (X >> 27)) & 0x0FFFFFFF; |
| Y = ((Y << 1) | (Y >> 27)) & 0x0FFFFFFF; |
| } |
| else |
| { |
| X = ((X << 2) | (X >> 26)) & 0x0FFFFFFF; |
| Y = ((Y << 2) | (Y >> 26)) & 0x0FFFFFFF; |
| } |
| |
| *SK++ = ((X << 4) & 0x24000000) | ((X << 28) & 0x10000000) |
| | ((X << 14) & 0x08000000) | ((X << 18) & 0x02080000) |
| | ((X << 6) & 0x01000000) | ((X << 9) & 0x00200000) |
| | ((X >> 1) & 0x00100000) | ((X << 10) & 0x00040000) |
| | ((X << 2) & 0x00020000) | ((X >> 10) & 0x00010000) |
| | ((Y >> 13) & 0x00002000) | ((Y >> 4) & 0x00001000) |
| | ((Y << 6) & 0x00000800) | ((Y >> 1) & 0x00000400) |
| | ((Y >> 14) & 0x00000200) | ((Y ) & 0x00000100) |
| | ((Y >> 5) & 0x00000020) | ((Y >> 10) & 0x00000010) |
| | ((Y >> 3) & 0x00000008) | ((Y >> 18) & 0x00000004) |
| | ((Y >> 26) & 0x00000002) | ((Y >> 24) & 0x00000001); |
| |
| *SK++ = ((X << 15) & 0x20000000) | ((X << 17) & 0x10000000) |
| | ((X << 10) & 0x08000000) | ((X << 22) & 0x04000000) |
| | ((X >> 2) & 0x02000000) | ((X << 1) & 0x01000000) |
| | ((X << 16) & 0x00200000) | ((X << 11) & 0x00100000) |
| | ((X << 3) & 0x00080000) | ((X >> 6) & 0x00040000) |
| | ((X << 15) & 0x00020000) | ((X >> 4) & 0x00010000) |
| | ((Y >> 2) & 0x00002000) | ((Y << 8) & 0x00001000) |
| | ((Y >> 14) & 0x00000808) | ((Y >> 9) & 0x00000400) |
| | ((Y ) & 0x00000200) | ((Y << 7) & 0x00000100) |
| | ((Y >> 7) & 0x00000020) | ((Y >> 3) & 0x00000011) |
| | ((Y << 2) & 0x00000004) | ((Y >> 21) & 0x00000002); |
| } |
| } |
| |
| /* |
| * DES key schedule (56-bit, encryption) |
| */ |
| void des_setkey_enc( des_context *ctx, unsigned char key[8] ) |
| { |
| des_setkey( ctx->sk, key ); |
| } |
| |
| /* |
| * DES key schedule (56-bit, decryption) |
| */ |
| void des_setkey_dec( des_context *ctx, unsigned char key[8] ) |
| { |
| int i; |
| |
| des_setkey( ctx->sk, key ); |
| |
| for( i = 0; i < 16; i += 2 ) |
| { |
| SWAP( ctx->sk[i ], ctx->sk[30 - i] ); |
| SWAP( ctx->sk[i + 1], ctx->sk[31 - i] ); |
| } |
| } |
| |
| /* |
| * DES-ECB block encryption/decryption |
| */ |
| void des_crypt_ecb( des_context *ctx, |
| const unsigned char input[8], |
| unsigned char output[8] ) |
| { |
| int i; |
| unsigned long X, Y, T, *SK; |
| |
| SK = ctx->sk; |
| |
| GET_ULONG_BE( X, input, 0 ); |
| GET_ULONG_BE( Y, input, 4 ); |
| |
| DES_IP( X, Y ); |
| |
| for( i = 0; i < 8; i++ ) |
| { |
| DES_ROUND( Y, X ); |
| DES_ROUND( X, Y ); |
| } |
| |
| DES_FP( Y, X ); |
| |
| PUT_ULONG_BE( Y, output, 0 ); |
| PUT_ULONG_BE( X, output, 4 ); |
| } |
| |
| #endif /* PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_DES */ |
