1 /* 2 * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org> 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 as published 6 * by the Free Software Foundation. 7 * 8 */ 9 10 #ifndef _BUFFALO_LIB_H 11 #define _BUFFALO_LIB_H 12 13 #include <stdint.h> 14 15 #define ARRAY_SIZE(_a) (sizeof((_a)) / sizeof((_a)[0])) 16 #define BIT(_x) (1UL << (_x)) 17 18 #define TAG_BRAND_LEN 32 19 #define TAG_PRODUCT_LEN 32 20 #define TAG_VERSION_LEN 8 21 #define TAG_REGION_LEN 2 22 #define TAG_LANGUAGE_LEN 8 23 #define TAG_PLATFORM_LEN 8 24 #define TAG_HWVER_LEN 4 25 #define TAG_HWVER_VAL_LEN 4 26 27 struct buffalo_tag { 28 unsigned char product[TAG_PRODUCT_LEN]; 29 unsigned char brand[TAG_BRAND_LEN]; 30 unsigned char ver_major[TAG_VERSION_LEN]; 31 unsigned char ver_minor[TAG_VERSION_LEN]; 32 unsigned char region_code[2]; 33 uint32_t region_mask; 34 unsigned char unknown0[2]; 35 unsigned char language[TAG_LANGUAGE_LEN]; 36 unsigned char platform[TAG_PLATFORM_LEN]; 37 unsigned char hwv[TAG_HWVER_LEN]; 38 unsigned char hwv_val[TAG_HWVER_VAL_LEN]; 39 uint8_t unknown1[24]; 40 41 uint32_t len; 42 uint32_t crc; 43 uint32_t base1; 44 uint32_t base2; 45 uint32_t data_len; 46 uint8_t flag; 47 uint8_t unknown2[3]; 48 } __attribute ((packed)); 49 50 struct buffalo_tag2 { 51 unsigned char product[TAG_PRODUCT_LEN]; 52 unsigned char brand[TAG_BRAND_LEN]; 53 unsigned char ver_major[TAG_VERSION_LEN]; 54 unsigned char ver_minor[TAG_VERSION_LEN]; 55 unsigned char region_code[2]; 56 uint32_t region_mask; 57 unsigned char unknown0[2]; 58 unsigned char language[TAG_LANGUAGE_LEN]; 59 unsigned char platform[TAG_PLATFORM_LEN]; 60 unsigned char hwv[TAG_HWVER_LEN]; 61 unsigned char hwv_val[TAG_HWVER_VAL_LEN]; 62 uint8_t unknown1[24]; 63 64 uint32_t total_len; 65 uint32_t crc; 66 uint32_t len1; 67 uint32_t len2; 68 uint8_t flag; 69 uint8_t unknown2[3]; 70 } __attribute ((packed)); 71 72 #define ENC_PRODUCT_LEN 32 73 #define ENC_VERSION_LEN 8 74 #define ENC_MAGIC_LEN 6 75 76 unsigned long enc_compute_header_len(char *product, char *version); 77 unsigned long enc_compute_buf_len(char *product, char *version, 78 unsigned long datalen); 79 80 struct enc_param { 81 unsigned char *key; 82 unsigned char magic[ENC_MAGIC_LEN]; 83 unsigned char product[ENC_PRODUCT_LEN]; 84 unsigned char version[ENC_VERSION_LEN]; 85 unsigned char seed; 86 int longstate; 87 unsigned datalen; 88 uint32_t csum; 89 }; 90 91 int encrypt_buf(struct enc_param *ep, unsigned char *hdr, 92 unsigned char *data); 93 int decrypt_buf(struct enc_param *ep, unsigned char *data, 94 unsigned long datalen); 95 96 #define BCRYPT_DEFAULT_STATE_LEN 256 97 #define BCRYPT_MAX_KEYLEN 254 98 99 struct bcrypt_ctx { 100 unsigned long i; 101 unsigned long j; 102 unsigned char *state; 103 unsigned long state_len; 104 }; 105 106 int bcrypt_init(struct bcrypt_ctx *ctx, void *key, int keylen, 107 unsigned long state_len); 108 int bcrypt_process(struct bcrypt_ctx *ctx, unsigned char *src, 109 unsigned char *dst, unsigned long len); 110 void bcrypt_finish(struct bcrypt_ctx *ctx); 111 int bcrypt_buf(unsigned char seed, unsigned char *key, unsigned char *src, 112 unsigned char *dst, unsigned long len, int longstate); 113 114 uint32_t buffalo_csum(uint32_t csum, void *buf, unsigned long len); 115 uint32_t buffalo_crc(void *buf, unsigned long len); 116 117 ssize_t get_file_size(char *name); 118 int read_file_to_buf(char *name, void *buf, ssize_t buflen); 119 int write_buf_to_file(char *name, void *buf, ssize_t buflen); 120 121 #endif /* _BUFFALO_LIB_H */ 122