diff options
Diffstat (limited to 'crypto/openssh/acss.c')
| -rw-r--r-- | crypto/openssh/acss.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/crypto/openssh/acss.c b/crypto/openssh/acss.c new file mode 100644 index 0000000..9364ba9 --- /dev/null +++ b/crypto/openssh/acss.c @@ -0,0 +1,264 @@ +/* $Id: acss.c,v 1.2 2004/02/06 04:22:43 dtucker Exp $ */ +/* + * Copyright (c) 2004 The OpenBSD project + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, 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. + */ + +#include "includes.h" +#include <openssl/evp.h> + +#if !defined(EVP_CTRL_SET_ACSS_MODE) && (OPENSSL_VERSION_NUMBER >= 0x00906000L) + +#include "acss.h" + +/* decryption sbox */ +static unsigned char sboxdec[] = { + 0x33, 0x73, 0x3b, 0x26, 0x63, 0x23, 0x6b, 0x76, + 0x3e, 0x7e, 0x36, 0x2b, 0x6e, 0x2e, 0x66, 0x7b, + 0xd3, 0x93, 0xdb, 0x06, 0x43, 0x03, 0x4b, 0x96, + 0xde, 0x9e, 0xd6, 0x0b, 0x4e, 0x0e, 0x46, 0x9b, + 0x57, 0x17, 0x5f, 0x82, 0xc7, 0x87, 0xcf, 0x12, + 0x5a, 0x1a, 0x52, 0x8f, 0xca, 0x8a, 0xc2, 0x1f, + 0xd9, 0x99, 0xd1, 0x00, 0x49, 0x09, 0x41, 0x90, + 0xd8, 0x98, 0xd0, 0x01, 0x48, 0x08, 0x40, 0x91, + 0x3d, 0x7d, 0x35, 0x24, 0x6d, 0x2d, 0x65, 0x74, + 0x3c, 0x7c, 0x34, 0x25, 0x6c, 0x2c, 0x64, 0x75, + 0xdd, 0x9d, 0xd5, 0x04, 0x4d, 0x0d, 0x45, 0x94, + 0xdc, 0x9c, 0xd4, 0x05, 0x4c, 0x0c, 0x44, 0x95, + 0x59, 0x19, 0x51, 0x80, 0xc9, 0x89, 0xc1, 0x10, + 0x58, 0x18, 0x50, 0x81, 0xc8, 0x88, 0xc0, 0x11, + 0xd7, 0x97, 0xdf, 0x02, 0x47, 0x07, 0x4f, 0x92, + 0xda, 0x9a, 0xd2, 0x0f, 0x4a, 0x0a, 0x42, 0x9f, + 0x53, 0x13, 0x5b, 0x86, 0xc3, 0x83, 0xcb, 0x16, + 0x5e, 0x1e, 0x56, 0x8b, 0xce, 0x8e, 0xc6, 0x1b, + 0xb3, 0xf3, 0xbb, 0xa6, 0xe3, 0xa3, 0xeb, 0xf6, + 0xbe, 0xfe, 0xb6, 0xab, 0xee, 0xae, 0xe6, 0xfb, + 0x37, 0x77, 0x3f, 0x22, 0x67, 0x27, 0x6f, 0x72, + 0x3a, 0x7a, 0x32, 0x2f, 0x6a, 0x2a, 0x62, 0x7f, + 0xb9, 0xf9, 0xb1, 0xa0, 0xe9, 0xa9, 0xe1, 0xf0, + 0xb8, 0xf8, 0xb0, 0xa1, 0xe8, 0xa8, 0xe0, 0xf1, + 0x5d, 0x1d, 0x55, 0x84, 0xcd, 0x8d, 0xc5, 0x14, + 0x5c, 0x1c, 0x54, 0x85, 0xcc, 0x8c, 0xc4, 0x15, + 0xbd, 0xfd, 0xb5, 0xa4, 0xed, 0xad, 0xe5, 0xf4, + 0xbc, 0xfc, 0xb4, 0xa5, 0xec, 0xac, 0xe4, 0xf5, + 0x39, 0x79, 0x31, 0x20, 0x69, 0x29, 0x61, 0x70, + 0x38, 0x78, 0x30, 0x21, 0x68, 0x28, 0x60, 0x71, + 0xb7, 0xf7, 0xbf, 0xa2, 0xe7, 0xa7, 0xef, 0xf2, + 0xba, 0xfa, 0xb2, 0xaf, 0xea, 0xaa, 0xe2, 0xff +}; + +/* encryption sbox */ +static unsigned char sboxenc[] = { + 0x33, 0x3b, 0x73, 0x15, 0x53, 0x5b, 0x13, 0x75, + 0x3d, 0x35, 0x7d, 0x1b, 0x5d, 0x55, 0x1d, 0x7b, + 0x67, 0x6f, 0x27, 0x81, 0xc7, 0xcf, 0x87, 0x21, + 0x69, 0x61, 0x29, 0x8f, 0xc9, 0xc1, 0x89, 0x2f, + 0xe3, 0xeb, 0xa3, 0x05, 0x43, 0x4b, 0x03, 0xa5, + 0xed, 0xe5, 0xad, 0x0b, 0x4d, 0x45, 0x0d, 0xab, + 0xea, 0xe2, 0xaa, 0x00, 0x4a, 0x42, 0x0a, 0xa0, + 0xe8, 0xe0, 0xa8, 0x02, 0x48, 0x40, 0x08, 0xa2, + 0x3e, 0x36, 0x7e, 0x14, 0x5e, 0x56, 0x1e, 0x74, + 0x3c, 0x34, 0x7c, 0x16, 0x5c, 0x54, 0x1c, 0x76, + 0x6a, 0x62, 0x2a, 0x80, 0xca, 0xc2, 0x8a, 0x20, + 0x68, 0x60, 0x28, 0x82, 0xc8, 0xc0, 0x88, 0x22, + 0xee, 0xe6, 0xae, 0x04, 0x4e, 0x46, 0x0e, 0xa4, + 0xec, 0xe4, 0xac, 0x06, 0x4c, 0x44, 0x0c, 0xa6, + 0xe7, 0xef, 0xa7, 0x01, 0x47, 0x4f, 0x07, 0xa1, + 0xe9, 0xe1, 0xa9, 0x0f, 0x49, 0x41, 0x09, 0xaf, + 0x63, 0x6b, 0x23, 0x85, 0xc3, 0xcb, 0x83, 0x25, + 0x6d, 0x65, 0x2d, 0x8b, 0xcd, 0xc5, 0x8d, 0x2b, + 0x37, 0x3f, 0x77, 0x11, 0x57, 0x5f, 0x17, 0x71, + 0x39, 0x31, 0x79, 0x1f, 0x59, 0x51, 0x19, 0x7f, + 0xb3, 0xbb, 0xf3, 0x95, 0xd3, 0xdb, 0x93, 0xf5, + 0xbd, 0xb5, 0xfd, 0x9b, 0xdd, 0xd5, 0x9d, 0xfb, + 0xba, 0xb2, 0xfa, 0x90, 0xda, 0xd2, 0x9a, 0xf0, + 0xb8, 0xb0, 0xf8, 0x92, 0xd8, 0xd0, 0x98, 0xf2, + 0x6e, 0x66, 0x2e, 0x84, 0xce, 0xc6, 0x8e, 0x24, + 0x6c, 0x64, 0x2c, 0x86, 0xcc, 0xc4, 0x8c, 0x26, + 0x3a, 0x32, 0x7a, 0x10, 0x5a, 0x52, 0x1a, 0x70, + 0x38, 0x30, 0x78, 0x12, 0x58, 0x50, 0x18, 0x72, + 0xbe, 0xb6, 0xfe, 0x94, 0xde, 0xd6, 0x9e, 0xf4, + 0xbc, 0xb4, 0xfc, 0x96, 0xdc, 0xd4, 0x9c, 0xf6, + 0xb7, 0xbf, 0xf7, 0x91, 0xd7, 0xdf, 0x97, 0xf1, + 0xb9, 0xb1, 0xf9, 0x9f, 0xd9, 0xd1, 0x99, 0xff +}; + +static unsigned char reverse[] = { + 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, + 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, + 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, + 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, + 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, + 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, + 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, + 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, + 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, + 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, + 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, + 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, + 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, + 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, + 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, + 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, + 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, + 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, + 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, + 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, + 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, + 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, + 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, + 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, + 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, + 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, + 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, + 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, + 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, + 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, + 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, + 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff +}; + +/* + * Two linear feedback shift registers are used: + * + * lfsr17: polynomial of degree 17, primitive modulo 2 (listed in Schneier) + * x^15 + x + 1 + * lfsr25: polynomial of degree 25, not know if primitive modulo 2 + * x^13 + x^5 + x^4 + x^1 + 1 + * + * Output bits are discarded, instead the feedback bits are added to produce + * the cipher stream. Depending on the mode, feedback bytes may be inverted + * bit-wise before addition. + * + * The lfsrs are seeded with bytes from the raw key: + * + * lfsr17: byte 0[0:7] at bit 9 + * byte 1[0:7] at bit 0 + * + * lfsr25: byte 2[0:4] at bit 16 + * byte 2[5:7] at bit 22 + * byte 3[0:7] at bit 8 + * byte 4[0:7] at bit 0 + * + * To prevent 0 cycles, 1's are inject at bit 8 in lfrs17 and bit 21 in + * lfsr25. + * + */ + +int +acss(ACSS_KEY *key, unsigned long len, const unsigned char *in, + unsigned char *out) +{ + unsigned long i; + unsigned long lfsr17tmp, lfsr25tmp, lfsrsumtmp; + + lfsrsumtmp = lfsr17tmp = lfsr25tmp = 0; + + /* keystream is sum of lfsrs */ + for (i = 0; i < len; i++) { + lfsr17tmp = key->lfsr17 ^ (key->lfsr17 >> 14); + key->lfsr17 = (key->lfsr17 >> 8) + ^ (lfsr17tmp << 9) + ^ (lfsr17tmp << 12) + ^ (lfsr17tmp << 15); + key->lfsr17 &= 0x1ffff; /* 17 bit LFSR */ + + lfsr25tmp = key->lfsr25 + ^ (key->lfsr25 >> 3) + ^ (key->lfsr25 >> 4) + ^ (key->lfsr25 >> 12); + key->lfsr25 = (key->lfsr25 >> 8) ^ (lfsr25tmp << 17); + key->lfsr25 &= 0x1ffffff; /* 25 bit LFSR */ + + lfsrsumtmp = key->lfsrsum; + + /* addition */ + switch (key->mode) { + case ACSS_AUTHENTICATE: + case ACSS_DATA: + key->lfsrsum = 0xff & ~(key->lfsr17 >> 9); + key->lfsrsum += key->lfsr25 >> 17; + break; + case ACSS_SESSIONKEY: + key->lfsrsum = key->lfsr17 >> 9; + key->lfsrsum += key->lfsr25 >> 17; + break; + case ACSS_TITLEKEY: + key->lfsrsum = key->lfsr17 >> 9; + key->lfsrsum += 0xff & ~(key->lfsr25 >> 17); + break; + default: + return 1; + } + key->lfsrsum += (lfsrsumtmp >> 8); + + if (key->encrypt) { + out[i] = sboxenc[(in[i] ^ key->lfsrsum) & 0xff]; + } else { + out[i] = (sboxdec[in[i]] ^ key->lfsrsum) & 0xff; + } + } + + return 0; +} + +static void +acss_seed(ACSS_KEY *key) +{ + int i; + + /* if available, mangle with subkey */ + if (key->subkey_avilable) { + for (i = 0; i < ACSS_KEYSIZE; i++) + key->seed[i] = reverse[key->data[i] ^ key->subkey[i]]; + } else { + for (i = 0; i < ACSS_KEYSIZE; i++) + key->seed[i] = reverse[key->data[i]]; + } + + /* seed lfsrs */ + key->lfsr17 = key->seed[1] + | (key->seed[0] << 9) + | (1 << 8); /* inject 1 at bit 9 */ + key->lfsr25 = key->seed[4] + | (key->seed[3] << 8) + | ((key->seed[2] & 0x1f) << 16) + | ((key->seed[2] & 0xe0) << 17) + | (1 << 21); /* inject 1 at bit 22 */ + + key->lfsrsum = 0; +} + +void +acss_setkey(ACSS_KEY *key, const unsigned char *data, int enc, int mode) +{ + memcpy(key->data, data, sizeof(key->data)); + memset(key->subkey, 0, sizeof(key->subkey)); + + if (enc != -1) + key->encrypt = enc; + key->mode = mode; + key->subkey_avilable = 0; + + acss_seed(key); +} + +void +acss_setsubkey(ACSS_KEY *key, const unsigned char *subkey) +{ + memcpy(key->subkey, subkey, sizeof(key->subkey)); + key->subkey_avilable = 1; + acss_seed(key); +} +#endif |
