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-rw-r--r--utils/ypr0tools/fwdecrypt.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/utils/ypr0tools/fwdecrypt.c b/utils/ypr0tools/fwdecrypt.c
new file mode 100644
index 0000000000..eb611feb37
--- /dev/null
+++ b/utils/ypr0tools/fwdecrypt.c
@@ -0,0 +1,168 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ *
+ * Copyright (C) 2013 Lorenzo Miori
+ *
+ * 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 <string.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <getopt.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include "common.h"
+
+static char* output_dir = NULL;
+static FILE* input_file = NULL;
+static struct firmware_data fw;
+
+static void cleanup(void)
+{
+ for (int i = 0; i < YPR0_COMPONENTS_COUNT; i++)
+ {
+ free(fw.component_data[i]);
+ }
+}
+
+static void die(int error)
+{
+ if (input_file != NULL)
+ fclose(input_file);
+ free(output_dir);
+ cleanup();
+ exit(error);
+}
+
+int main(int argc, char **argv)
+{
+ FILE* component_handle = NULL;
+ FILE* rev_info_file = NULL;
+ char* tmp_path = malloc(MAX_PATH);
+ int error = 0;
+ bool md5sum_error = false;
+
+ memset(&fw, 0, sizeof(fw));
+
+ if (argc < 2)
+ {
+ printf("Decrypts Samsung YP-R0/YP-R1 ROM file format\n"
+ "Usage: fwdecrypt <ROM file path\n"
+ );
+ return 1;
+ }
+
+ output_dir = malloc(MAX_PATH);
+ output_dir[0] = '\0';
+ if (argc > 2)
+ {
+ strcpy(output_dir, argv[2]);
+ }
+
+ /* open the output file for write */
+ input_file = fopen(argv[1], "rb");
+ if (input_file == NULL)
+ {
+ fprintf(stderr, "Cannot open file for reading: %m\n");
+ die(SAMSUNG_READ_ERROR);
+ }
+
+ /* read some generic information */
+ join_path(tmp_path, output_dir, "RevisionInfo.txt");
+ rev_info_file = fopen(tmp_path, "w");
+ for (int i = 0; i < 5; i++)
+ {
+ char info[MAX_HEADER_LEN];
+ error += fgets(info, MAX_HEADER_LEN, input_file) == NULL;
+ printf("%s", info);
+ if (rev_info_file != NULL)
+ fprintf(rev_info_file, "%s", info);
+ }
+ if (rev_info_file != NULL)
+ fclose(rev_info_file);
+
+ if (error != 0)
+ {
+ fprintf(stderr, "Cannot write generic header\n");
+ die(SAMSUNG_WRITE_ERROR);
+ }
+
+ /* read metadata */
+ for (int i = 0; i < YPR0_COMPONENTS_COUNT; i++)
+ {
+ char metadata[MAX_HEADER_LEN];
+ error += fgets(metadata, MAX_HEADER_LEN, input_file) == NULL;
+ error += sscanf(metadata, "%*s : size(%ld),checksum(%s)",
+ &fw.component_size[i], fw.component_checksum[i]) != 2;
+ /* strip last ")" */
+ fw.component_checksum[i][strlen(fw.component_checksum[i])-1] = '\0';
+ printf("%s: %ld bytes -- MD5 %s\n", firmware_components[i],
+ fw.component_size[i], fw.component_checksum[i]);
+ }
+
+ /* We start from the end because ROM header could have a different
+ * line count or extra new-lines (noticed in some hacked ROMs)
+ */
+ size_t current_pos = get_filesize(input_file);
+ for (int i = YPR0_COMPONENTS_COUNT-1; i >= 0; i--)
+ {
+
+ fw.component_data[i] = malloc(fw.component_size[i]);
+ current_pos -= fw.component_size[i];
+ fseek(input_file, current_pos, SEEK_SET);
+ size_t bread = fread(fw.component_data[i], 1, fw.component_size[i], input_file);
+ if (bread != fw.component_size[i])
+ fprintf(stderr, "%s: Read size mismatch: read %ld bytes, expected %ld bytes\n",
+ firmware_components[i], bread, fw.component_size[i]);
+
+ /* decrypt data */
+ cyclic_xor(fw.component_data[i], fw.component_size[i], g_yp_key, sizeof(g_yp_key));
+
+ /* unpatch bootloader */
+ if (strcmp("MBoot", firmware_components[i]) == 0)
+ {
+ memset(fw.component_data[i] + MBOOT_CHECKSUM_OFFSET, 0, MBOOT_CHECKSUM_LENGTH);
+ }
+
+ char md5sum_decrypted[MD5_DIGEST_LENGTH*2+1];
+
+ md5sum(md5sum_decrypted, fw.component_data[i], fw.component_size[i]);
+
+ if (strcmp(md5sum_decrypted, fw.component_checksum[i]) != 0)
+ {
+ printf("%s: FAIL (md5sum doesn't match)\n", firmware_components[i]);
+ md5sum_error = true;
+ }
+
+ join_path(tmp_path, output_dir, firmware_filenames[i]);
+ component_handle = fopen(tmp_path, "wb");
+
+ if (component_handle == NULL)
+ {
+ fprintf(stderr, "Error opening file for writing. Is the directory valid and writeable?\n");
+ die(SAMSUNG_WRITE_ERROR);
+ }
+
+ fwrite(fw.component_data[i], 1, fw.component_size[i], component_handle);
+ fclose(component_handle);
+
+ }
+
+ if (md5sum_error)
+ die(SAMSUNG_MD5_ERROR);
+ die(SAMSUNG_SUCCESS);
+}