/* * dlls/rsaen/rc2.c * RC2 functions * * Copyright 2004 Michael Jung * Based on public domain code by Tom St Denis (tomstdenis@iahu.ca) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */ /* * This file contains code from the LibTomCrypt cryptographic * library written by Tom St Denis (tomstdenis@iahu.ca). LibTomCrypt * is in the public domain. The code in this file is tailored to * special requirements. Take a look at http://libtomcrypt.org for the * original version. */ #include "tomcrypt.h" /* 256-entry permutation table, probably derived somehow from pi */ static const unsigned char permute[256] = { 217,120,249,196, 25,221,181,237, 40,233,253,121, 74,160,216,157, 198,126, 55,131, 43,118, 83,142, 98, 76,100,136, 68,139,251,162, 23,154, 89,245,135,179, 79, 19, 97, 69,109,141, 9,129,125, 50, 189,143, 64,235,134,183,123, 11,240,149, 33, 34, 92,107, 78,130, 84,214,101,147,206, 96,178, 28,115, 86,192, 20,167,140,241,220, 18,117,202, 31, 59,190,228,209, 66, 61,212, 48,163, 60,182, 38, 111,191, 14,218, 70,105, 7, 87, 39,242, 29,155,188,148, 67, 3, 248, 17,199,246,144,239, 62,231, 6,195,213, 47,200,102, 30,215, 8,232,234,222,128, 82,238,247,132,170,114,172, 53, 77,106, 42, 150, 26,210,113, 90, 21, 73,116, 75,159,208, 94, 4, 24,164,236, 194,224, 65,110, 15, 81,203,204, 36,145,175, 80,161,244,112, 57, 153,124, 58,133, 35,184,180,122,252, 2, 54, 91, 37, 85,151, 49, 45, 93,250,152,227,138,146,174, 5,223, 41, 16,103,108,186,201, 211, 0,230,207,225,158,168, 44, 99, 22, 1, 63, 88,226,137,169, 13, 56, 52, 27,171, 51,255,176,187, 72, 12, 95,185,177,205, 46, 197,243,219, 71,229,165,156,119, 10,166, 32,104,254,127,193,173 }; int rc2_setup(const unsigned char *key, int keylen, int bits, int rounds, rc2_key *rc2) { unsigned *xkey = rc2->xkey; unsigned char tmp[128]; unsigned T8, TM; int i; if (keylen < 5 || keylen > 128) { return CRYPT_INVALID_KEYSIZE; } if (rounds != 0 && rounds != 16) { return CRYPT_INVALID_ROUNDS; } /* Following comment is from Eric Young's rc2 code: */ /* It has come to my attention that there are 2 versions of the RC2 * key schedule. One which is normal, and anther which has a hook to * use a reduced key length. * BSAFE uses the 'retarded' version. What I previously shipped is * the same as specifying 1024 for the 'bits' parameter. BSAFE uses * a version where the bits parameter is the same as len*8 */ /* Seems like MS uses the 'retarded' version, too. * Adjust effective keylen bits */ if (bits <= 0) bits = keylen << 3; if (bits > 1024) bits = 1024; for (i = 0; i < keylen; i++) { tmp[i] = key[i] & 255; } /* Phase 1: Expand input key to 128 bytes */ if (keylen < 128) { for (i = keylen; i < 128; i++) { tmp[i] = permute[(tmp[i - 1] + tmp[i - keylen]) & 255]; } } /* Phase 2 - reduce effective key size to "bits" */ /*bits = keylen<<3; */ T8 = (unsigned)(bits+7)>>3; TM = (255 >> (unsigned)(7 & -bits)); tmp[128 - T8] = permute[tmp[128 - T8] & TM]; for (i = 127 - T8; i >= 0; i--) { tmp[i] = permute[tmp[i + 1] ^ tmp[i + T8]]; } /* Phase 3 - copy to xkey in little-endian order */ for (i = 0; i < 64; i++) { xkey[i] = (unsigned)tmp[2*i] + ((unsigned)tmp[2*i+1] << 8); } return CRYPT_OK; } /**********************************************************************\ * Encrypt an 8-byte block of plaintext using the given key. * \**********************************************************************/ void rc2_ecb_encrypt( const unsigned char *plain, unsigned char *cipher, rc2_key *rc2) { unsigned *xkey; unsigned x76, x54, x32, x10, i; xkey = rc2->xkey; x76 = ((unsigned)plain[7] << 8) + (unsigned)plain[6]; x54 = ((unsigned)plain[5] << 8) + (unsigned)plain[4]; x32 = ((unsigned)plain[3] << 8) + (unsigned)plain[2]; x10 = ((unsigned)plain[1] << 8) + (unsigned)plain[0]; for (i = 0; i < 16; i++) { x10 = (x10 + (x32 & ~x76) + (x54 & x76) + xkey[4*i+0]) & 0xFFFF; x10 = ((x10 << 1) | (x10 >> 15)); x32 = (x32 + (x54 & ~x10) + (x76 & x10) + xkey[4*i+1]) & 0xFFFF; x32 = ((x32 << 2) | (x32 >> 14)); x54 = (x54 + (x76 & ~x32) + (x10 & x32) + xkey[4*i+2]) & 0xFFFF; x54 = ((x54 << 3) | (x54 >> 13)); x76 = (x76 + (x10 & ~x54) + (x32 & x54) + xkey[4*i+3]) & 0xFFFF; x76 = ((x76 << 5) | (x76 >> 11)); if (i == 4 || i == 10) { x10 = (x10 + xkey[x76 & 63]) & 0xFFFF; x32 = (x32 + xkey[x10 & 63]) & 0xFFFF; x54 = (x54 + xkey[x32 & 63]) & 0xFFFF; x76 = (x76 + xkey[x54 & 63]) & 0xFFFF; } } cipher[0] = (unsigned char)x10; cipher[1] = (unsigned char)(x10 >> 8); cipher[2] = (unsigned char)x32; cipher[3] = (unsigned char)(x32 >> 8); cipher[4] = (unsigned char)x54; cipher[5] = (unsigned char)(x54 >> 8); cipher[6] = (unsigned char)x76; cipher[7] = (unsigned char)(x76 >> 8); } /**********************************************************************\ * Decrypt an 8-byte block of ciphertext using the given key. * \**********************************************************************/ void rc2_ecb_decrypt( const unsigned char *cipher, unsigned char *plain, rc2_key *rc2) { unsigned x76, x54, x32, x10; unsigned *xkey; int i; xkey = rc2->xkey; x76 = ((unsigned)cipher[7] << 8) + (unsigned)cipher[6]; x54 = ((unsigned)cipher[5] << 8) + (unsigned)cipher[4]; x32 = ((unsigned)cipher[3] << 8) + (unsigned)cipher[2]; x10 = ((unsigned)cipher[1] << 8) + (unsigned)cipher[0]; for (i = 15; i >= 0; i--) { if (i == 4 || i == 10) { x76 = (x76 - xkey[x54 & 63]) & 0xFFFF; x54 = (x54 - xkey[x32 & 63]) & 0xFFFF; x32 = (x32 - xkey[x10 & 63]) & 0xFFFF; x10 = (x10 - xkey[x76 & 63]) & 0xFFFF; } x76 = ((x76 << 11) | (x76 >> 5)); x76 = (x76 - ((x10 & ~x54) + (x32 & x54) + xkey[4*i+3])) & 0xFFFF; x54 = ((x54 << 13) | (x54 >> 3)); x54 = (x54 - ((x76 & ~x32) + (x10 & x32) + xkey[4*i+2])) & 0xFFFF; x32 = ((x32 << 14) | (x32 >> 2)); x32 = (x32 - ((x54 & ~x10) + (x76 & x10) + xkey[4*i+1])) & 0xFFFF; x10 = ((x10 << 15) | (x10 >> 1)); x10 = (x10 - ((x32 & ~x76) + (x54 & x76) + xkey[4*i+0])) & 0xFFFF; } plain[0] = (unsigned char)x10; plain[1] = (unsigned char)(x10 >> 8); plain[2] = (unsigned char)x32; plain[3] = (unsigned char)(x32 >> 8); plain[4] = (unsigned char)x54; plain[5] = (unsigned char)(x54 >> 8); plain[6] = (unsigned char)x76; plain[7] = (unsigned char)(x76 >> 8); }

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