481 lines
10 KiB
C
481 lines
10 KiB
C
/*
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* Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "buffalo-lib.h"
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static uint32_t crc32_table[256] =
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{
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0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
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0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
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0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
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0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
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0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
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0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
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0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
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0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
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0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
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0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
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0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
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0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
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0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
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0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
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0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
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0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
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0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
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0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
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0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
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0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
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0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
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0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
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0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
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0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
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0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
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0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
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0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
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0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
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0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
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0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
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0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
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0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
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0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
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0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
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0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
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0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
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0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
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0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
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0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
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0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
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0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
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0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
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0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
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0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
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0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
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0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
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0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
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0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
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0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
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0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
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0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
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0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
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0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
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0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
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0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
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0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
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0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
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0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
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0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
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0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
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0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
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0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
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0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
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0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
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};
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int bcrypt_init(struct bcrypt_ctx *ctx, void *key, int keylen,
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unsigned long state_len)
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{
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unsigned char *state;
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unsigned char *p = key;
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unsigned long i, j;
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unsigned long k = 0;
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state = malloc(state_len);
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if (state == NULL)
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return -1;
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ctx->i = 0;
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ctx->j = 0;
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ctx->state = state;
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ctx->state_len = state_len;
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for (i = 0; i < state_len; i++)
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state[i] = i;
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for(i = 0, j = 0; i < state_len; i++, j = (j + 1) % keylen) {
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unsigned char t;
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t = state[i];
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k = (k + p[j] + t) % state_len;
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state[i] = state[k];
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state[k] = t;
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}
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return 0;
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}
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int bcrypt_process(struct bcrypt_ctx *ctx, unsigned char *src,
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unsigned char *dst, unsigned long len)
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{
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unsigned char *state = ctx->state;
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unsigned long state_len = ctx->state_len;
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unsigned char i, j;
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unsigned long k;
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i = ctx->i;
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j = ctx->j;
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for (k = 0; k < len; k++) {
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unsigned char t;
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i = (i + 1) % state_len;
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j = (j + state[i]) % state_len;
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t = state[j];
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state[j] = state[i];
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state[i] = t;
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dst[k] = src[k] ^ state[(state[i] + state[j]) % state_len];
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}
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ctx->i = i;
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ctx->j = j;
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return len;
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}
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void bcrypt_finish(struct bcrypt_ctx *ctx)
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{
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if (ctx->state)
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free(ctx->state);
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}
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int bcrypt_buf(unsigned char seed, unsigned char *key, unsigned char *src,
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unsigned char *dst, unsigned long len, int longstate)
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{
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unsigned char bckey[BCRYPT_MAX_KEYLEN + 1];
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unsigned int keylen;
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struct bcrypt_ctx ctx;
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int ret;
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/* setup decryption key */
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keylen = strlen((char *) key);
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bckey[0] = seed;
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memcpy(&bckey[1], key, keylen);
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keylen++;
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ret = bcrypt_init(&ctx, bckey, keylen,
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(longstate) ? len : BCRYPT_DEFAULT_STATE_LEN);
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if (ret)
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return ret;
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bcrypt_process(&ctx, src, dst, len);
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bcrypt_finish(&ctx);
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return 0;
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}
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uint32_t buffalo_csum(uint32_t csum, void *buf, unsigned long len)
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{
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char *p = buf;
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while (len--) {
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int i;
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csum ^= *p++;
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for (i = 0; i < 8; i++)
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csum = (csum >> 1) ^ ((csum & 1) ? 0xedb88320ul : 0);
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}
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return csum;
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}
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uint32_t buffalo_crc(void *buf, unsigned long len)
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{
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unsigned char *p = buf;
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unsigned long t = len;
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uint32_t crc = 0;
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while (len--)
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crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *p++) & 0xFF];
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while (t) {
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crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ t) & 0xFF];
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t >>= 8;
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}
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return ~crc;
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}
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unsigned long enc_compute_header_len(char *product, char *version)
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{
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return ENC_MAGIC_LEN + 1 + strlen(product) + 1 +
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strlen(version) + 1 + 3 * sizeof(uint32_t);
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}
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unsigned long enc_compute_buf_len(char *product, char *version,
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unsigned long datalen)
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{
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unsigned long ret;
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ret = enc_compute_header_len(product, version);
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ret += datalen + sizeof(uint32_t);
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ret += (4 - ret % 4);
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return ret;
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}
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static void put_be32(void *data, uint32_t val)
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{
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unsigned char *p = data;
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p[0] = (val >> 24) & 0xff;
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p[1] = (val >> 16) & 0xff;
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p[2] = (val >> 8) & 0xff;
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p[3] = val & 0xff;
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}
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static uint32_t get_be32(void *data)
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{
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unsigned char *p = data;
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return (((uint32_t)p[0]) << 24) |
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(((uint32_t)p[1]) << 16) |
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(((uint32_t)p[2]) << 8) |
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((uint32_t)p[3]);
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}
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static int check_magic(void *magic)
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{
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if (!memcmp("start", magic, ENC_MAGIC_LEN))
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return 0;
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if (!memcmp("asar1", magic, ENC_MAGIC_LEN))
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return 0;
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return -1;
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}
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int encrypt_buf(struct enc_param *ep, unsigned char *hdr,
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unsigned char *data)
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{
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unsigned char *p;
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uint32_t len;
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int err;
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int ret = -1;
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unsigned char s;
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p = (unsigned char *) hdr;
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/* setup magic */
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len = strlen((char *) ep->magic) + 1;
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memcpy(p, ep->magic, len);
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p += len;
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/* setup seed */
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*p++ = ep->seed;
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/* put product len */
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len = strlen((char *) ep->product) + 1;
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put_be32(p, len);
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p += sizeof(uint32_t);
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/* copy and crypt product name */
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memcpy(p, ep->product, len);
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err = bcrypt_buf(ep->seed, ep->key, p, p, len, ep->longstate);
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if (err)
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goto out;
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s = *p;
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p += len;
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/* put version length */
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len = strlen((char *) ep->version) + 1;
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put_be32(p, len);
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p += sizeof(uint32_t);
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/* copy and crypt version */
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memcpy(p, ep->version, len);
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err = bcrypt_buf(s, ep->key, p, p, len, ep->longstate);
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if (err)
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goto out;
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s = *p;
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p += len;
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/* put data length */
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put_be32(p, ep->datalen);
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/* encrypt data */
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err = bcrypt_buf(s, ep->key, data, data, ep->datalen, ep->longstate);
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if (err)
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goto out;
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/* put checksum */
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put_be32(&data[ep->datalen], ep->csum);
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ret = 0;
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out:
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return ret;
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}
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int decrypt_buf(struct enc_param *ep, unsigned char *data,
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unsigned long datalen)
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{
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unsigned char *p;
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uint32_t prod_len;
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uint32_t ver_len;
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uint32_t len;
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uint32_t csum;
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ssize_t remain;
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int err;
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int ret = -1;
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#define CHECKLEN(_l) do { \
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len = (_l); \
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if (remain < len) { \
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goto out; \
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} \
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} while (0)
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#define INCP() do { \
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p += len; \
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remain -= len; \
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} while (0)
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remain = datalen;
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p = data;
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CHECKLEN(ENC_MAGIC_LEN);
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err = check_magic(p);
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if (err)
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goto out;
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memcpy(ep->magic, p, ENC_MAGIC_LEN);
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INCP();
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CHECKLEN(1);
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ep->seed = *p;
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INCP();
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CHECKLEN(sizeof(uint32_t));
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prod_len = get_be32(p);
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if (prod_len > ENC_PRODUCT_LEN)
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goto out;
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INCP();
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CHECKLEN(prod_len);
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memcpy(ep->product, p, prod_len);
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INCP();
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CHECKLEN(sizeof(uint32_t));
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ver_len = get_be32(p);
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if (ver_len > ENC_VERSION_LEN)
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goto out;
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INCP();
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CHECKLEN(ver_len);
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memcpy(ep->version, p, ver_len);
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INCP();
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CHECKLEN(sizeof(uint32_t));
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ep->datalen = get_be32(p);
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INCP();
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/* decrypt data */
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CHECKLEN(ep->datalen);
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err = bcrypt_buf(ep->version[0], ep->key, p, data, ep->datalen,
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ep->longstate);
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if (err)
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goto out;
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INCP();
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CHECKLEN(sizeof(uint32_t));
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ep->csum = get_be32(p);
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INCP();
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csum = buffalo_csum(ep->datalen, data, ep->datalen);
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if (csum != ep->csum)
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goto out;
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/* decrypt product name */
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err = bcrypt_buf(ep->product[0], ep->key, ep->version, ep->version,
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ver_len, ep->longstate);
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if (err)
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goto out;
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/* decrypt version */
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err = bcrypt_buf(ep->seed, ep->key, ep->product, ep->product, prod_len,
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ep->longstate);
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if (err)
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goto out;
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ret = 0;
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out:
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return ret;
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#undef CHECKLEN
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#undef INCP
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}
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ssize_t get_file_size(char *name)
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{
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struct stat st;
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int err;
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err = stat(name, &st);
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if (err)
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return -1;
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return st.st_size;
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}
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int read_file_to_buf(char *name, void *buf, ssize_t buflen)
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{
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FILE *f;
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size_t done;
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int ret = -1;
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f = fopen(name, "r");
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if (f == NULL)
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goto out;
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errno = 0;
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done = fread(buf, buflen, 1, f);
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if (done != 1)
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goto close;
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ret = 0;
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close:
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fclose(f);
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out:
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return ret;
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}
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int write_buf_to_file(char *name, void *buf, ssize_t buflen)
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{
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FILE *f;
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size_t done;
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int ret = -1;
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f = fopen(name, "w");
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if (f == NULL)
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goto out;
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errno = 0;
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done = fwrite(buf, buflen, 1, f);
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if (done != 1)
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goto close;
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ret = 0;
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close:
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fflush(f);
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fclose(f);
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if (ret)
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unlink(name);
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out:
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return ret;
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}
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