diff options
Diffstat (limited to 'tools/firmware-utils/src/buffalo-lib.c')
| -rw-r--r-- | tools/firmware-utils/src/buffalo-lib.c | 480 |
1 files changed, 480 insertions, 0 deletions
diff --git a/tools/firmware-utils/src/buffalo-lib.c b/tools/firmware-utils/src/buffalo-lib.c new file mode 100644 index 0000000000..00ad1a5c10 --- /dev/null +++ b/tools/firmware-utils/src/buffalo-lib.c @@ -0,0 +1,480 @@ +/* + * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <unistd.h> +#include <sys/stat.h> + +#include "buffalo-lib.h" + +static uint32_t crc32_table[256] = +{ + 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, + 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005, + 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61, + 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, + 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, + 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75, + 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, + 0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd, + 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039, + 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, + 0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81, + 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d, + 0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, + 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95, + 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, + 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, + 0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae, + 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072, + 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, + 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, + 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde, + 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, + 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066, + 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba, + 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, + 0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692, + 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6, + 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, + 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e, + 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, + 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, + 0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a, + 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637, + 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, + 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, + 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53, + 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, + 0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b, + 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff, + 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, + 0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, + 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b, + 0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, + 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3, + 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, + 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, + 0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f, + 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3, + 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, + 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, + 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8, + 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, + 0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30, + 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec, + 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, + 0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654, + 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0, + 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, + 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18, + 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, + 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, + 0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c, + 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668, + 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4 +}; + +int bcrypt_init(struct bcrypt_ctx *ctx, void *key, int keylen, + unsigned long state_len) +{ + unsigned char *state; + unsigned char *p = key; + unsigned long i, j; + unsigned long k = 0; + + state = malloc(state_len); + if (state == NULL) + return -1; + + ctx->i = 0; + ctx->j = 0; + ctx->state = state; + ctx->state_len = state_len; + + for (i = 0; i < state_len; i++) + state[i] = i; + + for(i = 0, j = 0; i < state_len; i++, j = (j + 1) % keylen) { + unsigned char t; + + t = state[i]; + k = (k + p[j] + t) % state_len; + state[i] = state[k]; + state[k] = t; + } + + return 0; +} + +int bcrypt_process(struct bcrypt_ctx *ctx, unsigned char *src, + unsigned char *dst, unsigned long len) +{ + unsigned char *state = ctx->state; + unsigned long state_len = ctx->state_len; + unsigned char i, j; + unsigned long k; + + i = ctx->i; + j = ctx->j; + + for (k = 0; k < len; k++) { + unsigned char t; + + i = (i + 1) % state_len; + j = (j + state[i]) % state_len; + t = state[j]; + state[j] = state[i]; + state[i] = t; + + dst[k] = src[k] ^ state[(state[i] + state[j]) % state_len]; + } + + ctx->i = i; + ctx->j = j; + + return len; +} + +void bcrypt_finish(struct bcrypt_ctx *ctx) +{ + if (ctx->state) + free(ctx->state); +} + +int bcrypt_buf(unsigned char seed, unsigned char *key, unsigned char *src, + unsigned char *dst, unsigned long len, int longstate) +{ + unsigned char bckey[BCRYPT_MAX_KEYLEN + 1]; + unsigned int keylen; + struct bcrypt_ctx ctx; + int ret; + + /* setup decryption key */ + keylen = strlen((char *) key); + bckey[0] = seed; + memcpy(&bckey[1], key, keylen); + + keylen++; + + ret = bcrypt_init(&ctx, bckey, keylen, + (longstate) ? len : BCRYPT_DEFAULT_STATE_LEN); + if (ret) + return ret; + + bcrypt_process(&ctx, src, dst, len); + bcrypt_finish(&ctx); + + return 0; +} + +uint32_t buffalo_csum(uint32_t csum, void *buf, unsigned long len) +{ + unsigned char *p = buf; + + while (len--) { + int i; + + csum ^= *p++; + for (i = 0; i < 8; i++) + csum = (csum >> 1) ^ ((csum & 1) ? 0xedb88320ul : 0); + } + + return csum; +} + +uint32_t buffalo_crc(void *buf, unsigned long len) +{ + unsigned char *p = buf; + unsigned long t = len; + uint32_t crc = 0; + + while (len--) + crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *p++) & 0xFF]; + + while (t) { + crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ t) & 0xFF]; + t >>= 8; + } + + return ~crc; +} + +unsigned long enc_compute_header_len(char *product, char *version) +{ + return ENC_MAGIC_LEN + 1 + strlen(product) + 1 + + strlen(version) + 1 + 3 * sizeof(uint32_t); +} + +unsigned long enc_compute_buf_len(char *product, char *version, + unsigned long datalen) +{ + unsigned long ret; + + ret = enc_compute_header_len(product, version); + ret += datalen + sizeof(uint32_t); + ret += (4 - ret % 4); + + return ret; +} + +static void put_be32(void *data, uint32_t val) +{ + unsigned char *p = data; + + p[0] = (val >> 24) & 0xff; + p[1] = (val >> 16) & 0xff; + p[2] = (val >> 8) & 0xff; + p[3] = val & 0xff; +} + +static uint32_t get_be32(void *data) +{ + unsigned char *p = data; + + return (((uint32_t)p[0]) << 24) | + (((uint32_t)p[1]) << 16) | + (((uint32_t)p[2]) << 8) | + ((uint32_t)p[3]); +} + +static int check_magic(void *magic) +{ + if (!memcmp("start", magic, ENC_MAGIC_LEN)); + return 0; + + if (!memcmp("asar1", magic, ENC_MAGIC_LEN)); + return 0; + + return -1; +} + +int encrypt_buf(struct enc_param *ep, unsigned char *hdr, + unsigned char *data) +{ + unsigned char *p; + uint32_t len; + int err; + int ret = -1; + unsigned char s; + + p = (unsigned char *) hdr; + + /* setup magic */ + len = strlen((char *) ep->magic) + 1; + memcpy(p, ep->magic, len); + p += len; + + /* setup seed */ + *p++ = ep->seed; + + /* put product len */ + len = strlen((char *) ep->product) + 1; + put_be32(p, len); + p += sizeof(uint32_t); + + /* copy and crypt product name */ + memcpy(p, ep->product, len); + err = bcrypt_buf(ep->seed, ep->key, p, p, len, ep->longstate); + if (err) + goto out; + s = *p; + p += len; + + /* put version length */ + len = strlen((char *) ep->version) + 1; + put_be32(p, len); + p += sizeof(uint32_t); + + /* copy and crypt version */ + memcpy(p, ep->version, len); + err = bcrypt_buf(s, ep->key, p, p, len, ep->longstate); + if (err) + goto out; + s = *p; + p += len; + + /* put data length */ + put_be32(p, ep->datalen); + + /* encrypt data */ + err = bcrypt_buf(s, ep->key, data, data, ep->datalen, ep->longstate); + if (err) + goto out; + + /* put checksum */ + put_be32(&data[ep->datalen], ep->csum); + + ret = 0; + +out: + return ret; +} + +int decrypt_buf(struct enc_param *ep, unsigned char *data, + unsigned long datalen) +{ + unsigned char *p; + uint32_t prod_len; + uint32_t ver_len; + uint32_t len; + uint32_t csum; + ssize_t remain; + int err; + int ret = -1; + +#define CHECKLEN(_l) do { \ + len = (_l); \ + if (remain < len) { \ + goto out; \ + } \ +} while (0) + +#define INCP() do { \ + p += len; \ + remain -= len; \ +} while (0) + + remain = datalen; + p = data; + + CHECKLEN(ENC_MAGIC_LEN); + err = check_magic(p); + if (err) + goto out; + memcpy(ep->magic, p, ENC_MAGIC_LEN); + INCP(); + + CHECKLEN(1); + ep->seed = *p; + INCP(); + + CHECKLEN(sizeof(uint32_t)); + prod_len = get_be32(p); + if (prod_len > ENC_PRODUCT_LEN) + goto out; + INCP(); + + CHECKLEN(prod_len); + memcpy(ep->product, p, prod_len); + INCP(); + + CHECKLEN(sizeof(uint32_t)); + ver_len = get_be32(p); + if (ver_len > ENC_VERSION_LEN) + goto out; + INCP(); + + CHECKLEN(ver_len); + memcpy(ep->version, p, ver_len); + INCP(); + + CHECKLEN(sizeof(uint32_t)); + ep->datalen = get_be32(p); + INCP(); + + /* decrypt data */ + CHECKLEN(ep->datalen); + err = bcrypt_buf(ep->version[0], ep->key, p, data, ep->datalen, + ep->longstate); + if (err) + goto out; + INCP(); + + CHECKLEN(sizeof(uint32_t)); + ep->csum = get_be32(p); + INCP(); + + csum = buffalo_csum(ep->datalen, data, ep->datalen); + if (csum != ep->csum) + goto out; + + /* decrypt product name */ + err = bcrypt_buf(ep->product[0], ep->key, ep->version, ep->version, + ver_len, ep->longstate); + if (err) + goto out; + + /* decrypt version */ + err = bcrypt_buf(ep->seed, ep->key, ep->product, ep->product, prod_len, + ep->longstate); + if (err) + goto out; + + ret = 0; +out: + return ret; + +#undef CHECKLEN +#undef INCP +} + +ssize_t get_file_size(char *name) +{ + struct stat st; + int err; + + err = stat(name, &st); + if (err) + return -1; + + return st.st_size; +} + +int read_file_to_buf(char *name, void *buf, ssize_t buflen) +{ + FILE *f; + size_t done; + int ret = -1; + + f = fopen(name, "r"); + if (f == NULL) + goto out; + + errno = 0; + done = fread(buf, buflen, 1, f); + if (done != 1) + goto close; + + ret = 0; + +close: + fclose(f); +out: + return ret; +} + +int write_buf_to_file(char *name, void *buf, ssize_t buflen) +{ + FILE *f; + size_t done; + int ret = -1; + + f = fopen(name, "w"); + if (f == NULL) + goto out; + + errno = 0; + done = fwrite(buf, buflen, 1, f); + if (done != 1) + goto close; + + ret = 0; + +close: + fflush(f); + fclose(f); + if (ret) + unlink(name); +out: + return ret; +} |