summaryrefslogtreecommitdiffstats
path: root/tools/creative.c
blob: 2d60fdd94c64643aa6107da65348cbdeedf093cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2008 by Maurus Cuelenaere
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <elf.h>

#include "creative.h"
#include "hmac-sha1.h"

static const char null_key_v1[]  = "CTL:N0MAD|PDE0.SIGN.";
static const char null_key_v2[]  = "CTL:N0MAD|PDE0.DPMP.";
static const char null_key_v3[]  = "CTL:Z3N07|PDE0.DPMP.";
static const char null_key_v4[]  = "CTL:N0MAD|PDE0.DPFP.";

static const struct device_info devices[] =
{
    /* Creative Zen Vision:M */
    {"C\0r\0e\0a\0t\0i\0v\0e\0 \0Z\0e\0n\0 \0V\0i\0s\0i\0o\0n\0:\0M",             42, null_key_v2},
    /* Creative Zen Vision:M Go! */
    {"C\0r\0e\0a\0t\0i\0v\0e\0 \0Z\0e\0n\0 \0V\0i\0s\0i\0o\0n\0:\0M\0 \0G\0o\0!", 50, null_key_v2},
    /* Creative Zen Vision  TL */
    /* The "" should be ANSI encoded or the device won't accept the firmware package. */
    {"C\0r\0e\0a\0t\0i\0v\0e\0 \0Z\0e\0n\0 \0V\0i\0s\0i\0o\0n\0 \0\0T\0L",       46, null_key_v2},
    /* Creative ZEN V */
    {"C\0r\0e\0a\0t\0i\0v\0e\0 \0Z\0E\0N\0 \0V",                                  42, null_key_v4},
    /* Creative ZEN */
    {"C\0r\0e\0a\0t\0i\0v\0e\0 \0Z\0E\0N",                                        48, null_key_v3}
};

/*
Create a Zen Vision:M FRESCUE structure file
*/
extern void int2le(unsigned int val, unsigned char* addr);
extern unsigned int le2int(unsigned char* buf);


static int make_ciff_file(const unsigned char *inbuf, unsigned int length,
                          unsigned char *outbuf, int device)
{
    unsigned char key[20];
    memcpy(outbuf, "FFIC", 4);
    int2le(length+90, &outbuf[4]);
    memcpy(&outbuf[8], "FNIC", 4);
    int2le(96, &outbuf[0xC]);
    memcpy(&outbuf[0x10], devices[device].cinf, devices[device].cinf_size);
    memset(&outbuf[0x10+devices[device].cinf_size], 0,
           96 - devices[device].cinf_size);
    memcpy(&outbuf[0x70], "ATAD", 4);
    int2le(length+32, &outbuf[0x74]);
    memcpy(&outbuf[0x78], "H\0j\0u\0k\0e\0b\0o\0x\0\x32\0.\0j\0r\0m",
           25); /*Unicode encoded*/
    memset(&outbuf[0x78+25], 0, 32);
    memcpy(&outbuf[0x98], inbuf, length);
    memcpy(&outbuf[0x98+length], "LLUN", 4);
    int2le(20, &outbuf[0x98+length+4]);
    /* Do checksum */
    hmac_sha1((unsigned char *)devices[device].null, strlen(devices[device].null),
             outbuf, 0x98+length, key);
    memcpy(&outbuf[0x98+length+8], key, 20);
    return length+0x90+0x1C+8;
}

static int elf_convert(const unsigned char *inbuf, unsigned char *outbuf)
{
    Elf32_Ehdr *main_header;
    Elf32_Shdr *section_header;
    unsigned int i, j, sum;
    intptr_t startaddr;
    
    main_header = (Elf32_Ehdr*)inbuf;
    if( !( main_header->e_ident[0] == ELFMAG0 && main_header->e_ident[1] == ELFMAG1
        && main_header->e_ident[2] == ELFMAG2 && main_header->e_ident[3] == ELFMAG3 ) )
    {
        printf("Invalid ELF header!\n");
        return -1;
    }
    
    startaddr = (intptr_t)outbuf;
    
    for(i = 0; i < main_header->e_shnum; i++)
    {
        section_header = (Elf32_Shdr*)(inbuf+main_header->e_shoff+i*sizeof(Elf32_Shdr));
        
        if( (section_header->sh_flags & SHF_WRITE || section_header->sh_flags & SHF_ALLOC
             || section_header->sh_flags & SHF_EXECINSTR) && section_header->sh_size > 0 
             && section_header->sh_type != SHT_NOBITS                                     )
        {
            /* Address */
            int2le(section_header->sh_addr, outbuf);
            outbuf += 4;
            /* Size */
            int2le(section_header->sh_size, outbuf);
            outbuf += 4;
            /* Checksum */
            sum = 0;
            for(j=0; j<section_header->sh_size; j+= 4)
                sum += le2int((unsigned char*)(inbuf+section_header->sh_offset+j)) + (le2int((unsigned char*)(inbuf+section_header->sh_offset+j))>>16);
            int2le(sum, outbuf);
            outbuf += 2;
            memset(outbuf, 0, 2);
            outbuf += 2;
            /* Data */
            memcpy(outbuf, inbuf+section_header->sh_offset, section_header->sh_size);
            outbuf += section_header->sh_size;
        }
    }
    return (int)((intptr_t)outbuf - startaddr);
}

static int make_jrm_file(const unsigned char *inbuf, unsigned char *outbuf)
{
    int length;

    /* Clear the header area to zero */
    memset(outbuf, 0, 0x18);

    /* Header (EDOC) */
    memcpy(outbuf, "EDOC", 4);
    /* Total Size: temporarily set to 0 */
    memset(&outbuf[0x4], 0, 4);
    /* 4 bytes of zero */
    memset(&outbuf[0x8], 0, 4);
    
    length = elf_convert(inbuf, &outbuf[0xC]);
    if(length < 0)
        return -1;
    /* Now set the actual Total Size */
    int2le(4+length, &outbuf[0x4]);

    return 0xC+length;
}

int zvm_encode(const char *iname, const char *oname, int device)
{
    size_t len;
    int length;
    FILE *file;
    unsigned char *outbuf;
    unsigned char *buf;

    file = fopen(iname, "rb");
    if (!file) {
        perror(iname);
        return -1;
    }
    fseek(file, 0, SEEK_END);
    length = ftell(file);

    fseek(file, 0, SEEK_SET);

    buf = (unsigned char*)malloc(length);
    if ( !buf ) {
        printf("Out of memory!\n");
        return -1;
    }

    len = fread(buf, 1, length, file);
    if(len < (size_t)length) {
        perror(iname);
        return -2;
    }
    fclose(file);

    outbuf = (unsigned char*)malloc(length+0x300);
    if ( !outbuf ) {
        free(buf);
        printf("Out of memory!\n");
        return -1;
    }
    length = make_jrm_file(buf, outbuf);
    free(buf);
    if(length < 0)
    {
        free(outbuf);
        printf("Error in making JRM file!\n");
        return -1;
    }
    buf = (unsigned char*)malloc(length+0x200);
    memset(buf, 0, length+0x200);
    length = make_ciff_file(outbuf, length, buf, device);
    free(outbuf);

    file = fopen(oname, "wb");
    if (!file) {
        free(buf);
        perror(oname);
        return -3;
    }

    len = fwrite(buf, 1, length, file);
    if(len < (size_t)length) {
        free(buf);
        perror(oname);
        return -4;
    }

    free(buf);

    fclose(file);

    return 0;
}