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author | Amaury Pouly <amaury.pouly@gmail.com> | 2012-11-29 17:29:13 +0100 |
---|---|---|
committer | Amaury Pouly <amaury.pouly@gmail.com> | 2012-11-29 17:30:54 +0100 |
commit | d66c16749a5c07aadcd0eb97b9340d7fa5ea26b0 (patch) | |
tree | 4c1b30ca5073cf2f6f7a227715fca557fbf39999 /utils | |
parent | ee36a396cd1619585a83803630db2d79b6cbefbd (diff) | |
download | rockbox-d66c16749a5c07aadcd0eb97b9340d7fa5ea26b0.tar.gz rockbox-d66c16749a5c07aadcd0eb97b9340d7fa5ea26b0.zip |
Introduce samsungtools to decrypt samsung firmware
Samsung provides many firmware upgrade in the format of a .dat
file, at least for nearly all YP's (checked for Q2, R0, T10, Z5).
This is a simple cyclic xor which a fixed key, a md5 sum and a
header specifying the model/version/region.
Change-Id: Ib0461a74196383189fd2d8162da444a85a229c60
Diffstat (limited to 'utils')
-rw-r--r-- | utils/samsungtools/Makefile | 17 | ||||
-rw-r--r-- | utils/samsungtools/fwdecrypt.c | 131 | ||||
-rw-r--r-- | utils/samsungtools/samsung.c | 127 | ||||
-rw-r--r-- | utils/samsungtools/samsung.h | 78 |
4 files changed, 353 insertions, 0 deletions
diff --git a/utils/samsungtools/Makefile b/utils/samsungtools/Makefile new file mode 100644 index 0000000000..97af8bb873 --- /dev/null +++ b/utils/samsungtools/Makefile | |||
@@ -0,0 +1,17 @@ | |||
1 | DEFINES= | ||
2 | CC=gcc | ||
3 | LD=gcc | ||
4 | CFLAGS=-g -std=c99 -W -Wall $(DEFINES) `pkg-config --cflags openssl` | ||
5 | LDFLAGS=`pkg-config --libs openssl` | ||
6 | BINS=fwdecrypt | ||
7 | |||
8 | all: $(BINS) | ||
9 | |||
10 | %.o: %.c | ||
11 | $(CC) $(CFLAGS) -c -o $@ $< | ||
12 | |||
13 | fwdecrypt: fwdecrypt.o samsung.o | ||
14 | $(LD) -o $@ $^ $(LDFLAGS) | ||
15 | |||
16 | clean: | ||
17 | rm -fr *.o $(BINS) | ||
diff --git a/utils/samsungtools/fwdecrypt.c b/utils/samsungtools/fwdecrypt.c new file mode 100644 index 0000000000..67dfb315c2 --- /dev/null +++ b/utils/samsungtools/fwdecrypt.c | |||
@@ -0,0 +1,131 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2012 Amaury Pouly | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | #include "samsung.h" | ||
22 | #include <stdio.h> | ||
23 | #include <stdlib.h> | ||
24 | #include <stdarg.h> | ||
25 | #include <getopt.h> | ||
26 | |||
27 | static bool g_debug = false; | ||
28 | static char *g_out_prefix = NULL; | ||
29 | |||
30 | static void usage(void) | ||
31 | { | ||
32 | printf("Usage: fwdecrypt [options] firmware\n"); | ||
33 | printf("Options:\n"); | ||
34 | printf(" -o <prefix>\tSet output file\n"); | ||
35 | printf(" -f/--force\tForce to continue on errors\n"); | ||
36 | printf(" -?/--help\tDisplay this message\n"); | ||
37 | printf(" -d/--debug\tDisplay debug messages\n"); | ||
38 | exit(1); | ||
39 | } | ||
40 | |||
41 | static int s_read(void *user, int offset, void *buf, int size) | ||
42 | { | ||
43 | FILE *f = user; | ||
44 | if(fseek(f, offset, SEEK_SET) != 0) | ||
45 | return 0; | ||
46 | return fread(buf, 1, size, f); | ||
47 | } | ||
48 | |||
49 | static void s_printf(void *user, bool error, const char *fmt, ...) | ||
50 | { | ||
51 | if(!g_debug && !error) | ||
52 | return; | ||
53 | (void) user; | ||
54 | va_list args; | ||
55 | va_start(args, fmt); | ||
56 | vprintf(fmt, args); | ||
57 | va_end(args); | ||
58 | } | ||
59 | |||
60 | int main(int argc, char **argv) | ||
61 | { | ||
62 | if(argc <= 1) | ||
63 | usage(); | ||
64 | |||
65 | while(1) | ||
66 | { | ||
67 | static struct option long_options[] = | ||
68 | { | ||
69 | {"help", no_argument, 0, '?'}, | ||
70 | {"debug", no_argument, 0, 'd'}, | ||
71 | {0, 0, 0, 0} | ||
72 | }; | ||
73 | |||
74 | int c = getopt_long(argc, argv, "?do:", long_options, NULL); | ||
75 | if(c == -1) | ||
76 | break; | ||
77 | switch(c) | ||
78 | { | ||
79 | case -1: | ||
80 | break; | ||
81 | case 'd': | ||
82 | g_debug = true; | ||
83 | break; | ||
84 | case '?': | ||
85 | usage(); | ||
86 | break; | ||
87 | case 'o': | ||
88 | g_out_prefix = optarg; | ||
89 | break; | ||
90 | default: | ||
91 | abort(); | ||
92 | } | ||
93 | } | ||
94 | |||
95 | if(optind != argc - 1) | ||
96 | usage(); | ||
97 | |||
98 | FILE *f = fopen(argv[optind], "rb"); | ||
99 | if(f == NULL) | ||
100 | { | ||
101 | printf("Cannot open file for reading: %m\n"); | ||
102 | return 1; | ||
103 | } | ||
104 | |||
105 | enum samsung_error_t err; | ||
106 | struct samsung_firmware_t *fw = samsung_read(s_read, s_printf, | ||
107 | f, &err); | ||
108 | if(fw == NULL || err != SAMSUNG_SUCCESS) | ||
109 | { | ||
110 | printf("Error reading firmware: %d\n", err); | ||
111 | samsung_free(fw); | ||
112 | return 1; | ||
113 | } | ||
114 | fclose(f); | ||
115 | |||
116 | if(g_out_prefix) | ||
117 | { | ||
118 | f = fopen(g_out_prefix, "wb"); | ||
119 | if(f == NULL) | ||
120 | { | ||
121 | printf("Cannot open file for writing: %m\n"); | ||
122 | return 2; | ||
123 | } | ||
124 | fwrite(fw->data, 1, fw->data_size, f); | ||
125 | fclose(f); | ||
126 | } | ||
127 | |||
128 | samsung_free(fw); | ||
129 | |||
130 | return 0; | ||
131 | } | ||
diff --git a/utils/samsungtools/samsung.c b/utils/samsungtools/samsung.c new file mode 100644 index 0000000000..decf34f208 --- /dev/null +++ b/utils/samsungtools/samsung.c | |||
@@ -0,0 +1,127 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2012 Amaury Pouly | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | #include "samsung.h" | ||
22 | #include <openssl/md5.h> | ||
23 | #include <string.h> | ||
24 | #include <stdlib.h> | ||
25 | |||
26 | #ifndef MIN | ||
27 | #define MIN(a,b) ((a) < (b) ? (a) : (b)) | ||
28 | #endif | ||
29 | |||
30 | static uint8_t g_yp_key[128] = | ||
31 | { | ||
32 | 0xa3, 0x04, 0xb9, 0xcd, 0x34, 0x13, 0x4a, 0x19, 0x19, 0x35, 0xdf, 0xbb, 0x8f, 0x3d, 0x7f, 0x09, | ||
33 | 0x42, 0x3c, 0x96, 0xc6, 0x41, 0xa9, 0x95, 0xf1, 0xd0, 0xac, 0x16, 0x37, 0x57, 0x1f, 0x28, 0xe7, | ||
34 | 0x0b, 0xc2, 0x12, 0x09, 0x39, 0x42, 0xd2, 0x96, 0xf5, 0x00, 0xd2, 0x23, 0xa4, 0x24, 0xe2, 0x8e, | ||
35 | 0x50, 0x3c, 0x6e, 0x23, 0xeb, 0x68, 0xed, 0x31, 0xb7, 0xee, 0xc0, 0xc7, 0x09, 0xf8, 0x0e, 0x9d, | ||
36 | 0x51, 0xed, 0x17, 0x95, 0x64, 0x09, 0xe0, 0xf9, 0xf0, 0xef, 0x86, 0xc0, 0x04, 0x46, 0x89, 0x8a, | ||
37 | 0x6e, 0x27, 0x69, 0xde, 0xc7, 0x9d, 0x1e, 0xee, 0x3c, 0x3f, 0x17, 0x05, 0x44, 0xbb, 0xbb, 0x1d, | ||
38 | 0x3d, 0x5d, 0x6e, 0xf2, 0xcf, 0x15, 0xd6, 0x3c, 0xcc, 0x7d, 0x67, 0x1a, 0xb8, 0xd2, 0x1b, 0x54, | ||
39 | 0x97, 0xa2, 0x58, 0x58, 0xf7, 0x4e, 0x5e, 0x50, 0x42, 0x69, 0xdc, 0xe7, 0x3a, 0x87, 0x2e, 0x22 | ||
40 | }; | ||
41 | |||
42 | static void cyclic_xor(void *data, int datasize, void *xor, int xorsize) | ||
43 | { | ||
44 | for(int i = 0; i < datasize; i++) | ||
45 | *(uint8_t *)(data + i) ^= *(uint8_t *)(xor + (i % xorsize)); | ||
46 | } | ||
47 | |||
48 | struct samsung_firmware_t *samsung_read(samsung_read_t read, | ||
49 | samsung_printf_t printf, void *user, enum samsung_error_t *err) | ||
50 | { | ||
51 | struct yp_header_t yp_hdr; | ||
52 | struct yp_md5_t yp_md5; | ||
53 | |||
54 | /* read and check header */ | ||
55 | if(read(user, 0, &yp_hdr, sizeof(yp_hdr)) != sizeof(yp_hdr)) | ||
56 | { | ||
57 | printf(user, true, "Cannot read YP header\n"); | ||
58 | *err = SAMSUNG_READ_ERROR; | ||
59 | return NULL; | ||
60 | } | ||
61 | if(strncmp(yp_hdr.signature, YP_SIGNATURE, sizeof(yp_hdr.signature)) != 0) | ||
62 | { | ||
63 | printf(user, true, "Bad YP signature\n"); | ||
64 | *err = SAMSUNG_FORMAT_ERROR; | ||
65 | return NULL; | ||
66 | } | ||
67 | |||
68 | printf(user, false, "Model: %s\n", yp_hdr.model); | ||
69 | printf(user, false, "Version: %s %s %s\n", yp_hdr.version, yp_hdr.region, yp_hdr.extra); | ||
70 | |||
71 | /* allocate and read data */ | ||
72 | struct samsung_firmware_t *fw = malloc(sizeof(struct samsung_firmware_t)); | ||
73 | memset(fw, 0, sizeof(struct samsung_firmware_t)); | ||
74 | fw->data_size = yp_hdr.datasize; | ||
75 | fw->data = malloc(fw->data_size); | ||
76 | strncpy(fw->version, yp_hdr.version, sizeof(yp_hdr.version)); | ||
77 | strncpy(fw->region, yp_hdr.region, sizeof(yp_hdr.region)); | ||
78 | strncpy(fw->extra, yp_hdr.extra, sizeof(yp_hdr.extra)); | ||
79 | strncpy(fw->model, yp_hdr.model, sizeof(yp_hdr.model)); | ||
80 | |||
81 | if(read(user, sizeof(yp_hdr), fw->data, fw->data_size) != fw->data_size) | ||
82 | { | ||
83 | printf(user, true, "Cannot read data\n"); | ||
84 | *err = SAMSUNG_READ_ERROR; | ||
85 | samsung_free(fw); | ||
86 | return NULL; | ||
87 | } | ||
88 | |||
89 | /* read and check MD5 */ | ||
90 | if(read(user, yp_hdr.datasize + sizeof(yp_hdr), &yp_md5, sizeof(yp_md5)) != sizeof(yp_md5)) | ||
91 | { | ||
92 | printf(user, true, "Cannot read MD5 sum\n"); | ||
93 | *err = SAMSUNG_READ_ERROR; | ||
94 | samsung_free(fw); | ||
95 | return NULL; | ||
96 | } | ||
97 | |||
98 | uint8_t actual_md5[MD5_DIGEST_LENGTH]; | ||
99 | MD5_CTX c; | ||
100 | MD5_Init(&c); | ||
101 | MD5_Update(&c, fw->data, fw->data_size); | ||
102 | MD5_Final(actual_md5, &c); | ||
103 | |||
104 | if(memcmp(actual_md5, yp_md5.md5, MD5_DIGEST_LENGTH) != 0) | ||
105 | { | ||
106 | printf(user, true, "MD5 mismatch\n"); | ||
107 | *err = SAMSUNG_MD5_ERROR; | ||
108 | samsung_free(fw); | ||
109 | return NULL; | ||
110 | } | ||
111 | |||
112 | /* decrypt */ | ||
113 | cyclic_xor(fw->data, fw->data_size, g_yp_key, sizeof(g_yp_key)); | ||
114 | |||
115 | /* success ! */ | ||
116 | *err = SAMSUNG_SUCCESS; | ||
117 | return fw; | ||
118 | } | ||
119 | |||
120 | void samsung_free(struct samsung_firmware_t *fw) | ||
121 | { | ||
122 | if(fw) | ||
123 | { | ||
124 | free(fw->data); | ||
125 | free(fw); | ||
126 | } | ||
127 | } | ||
diff --git a/utils/samsungtools/samsung.h b/utils/samsungtools/samsung.h new file mode 100644 index 0000000000..4336e02651 --- /dev/null +++ b/utils/samsungtools/samsung.h | |||
@@ -0,0 +1,78 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2012 Amaury Pouly | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | #ifndef __SAMSUNG_H__ | ||
22 | #define __SAMSUNG_H__ | ||
23 | |||
24 | #include <stdint.h> | ||
25 | #include <stdbool.h> | ||
26 | |||
27 | /** | ||
28 | * Low-Level | ||
29 | */ | ||
30 | |||
31 | struct yp_header_t | ||
32 | { | ||
33 | char signature[12]; | ||
34 | uint32_t pad; | ||
35 | char version[8]; | ||
36 | char region[4]; | ||
37 | char extra[4]; | ||
38 | char model[20]; | ||
39 | uint32_t datasize; | ||
40 | } __attribute__((packed)); | ||
41 | |||
42 | struct yp_md5_t | ||
43 | { | ||
44 | uint8_t md5[16]; | ||
45 | } __attribute__((packed)); | ||
46 | |||
47 | #define YP_SIGNATURE "SAMSUNG YEPP" | ||
48 | |||
49 | /** | ||
50 | * API | ||
51 | */ | ||
52 | |||
53 | struct samsung_firmware_t | ||
54 | { | ||
55 | char version[8]; | ||
56 | char region[4]; | ||
57 | char extra[4]; | ||
58 | char model[20]; | ||
59 | void *data; | ||
60 | int data_size; | ||
61 | }; | ||
62 | |||
63 | enum samsung_error_t | ||
64 | { | ||
65 | SAMSUNG_SUCCESS = 0, | ||
66 | SAMSUNG_READ_ERROR = -1, | ||
67 | SAMSUNG_FORMAT_ERROR = -2, | ||
68 | SAMSUNG_MD5_ERROR = -3, | ||
69 | }; | ||
70 | |||
71 | typedef int (*samsung_read_t)(void *user, int offset, void *buffer, int size); | ||
72 | typedef void (*samsung_printf_t)(void *user, bool error, const char *fmt, ...); | ||
73 | |||
74 | struct samsung_firmware_t *samsung_read(samsung_read_t read, | ||
75 | samsung_printf_t printf, void *user, enum samsung_error_t *err); | ||
76 | void samsung_free(struct samsung_firmware_t *fw); | ||
77 | |||
78 | #endif /* __SAMSUNG_H__ */ | ||