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src/samples/debug/prxdecrypt/main.c

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+/*
+ * PSP Software Development Kit - http://www.pspdev.org
+ * -----------------------------------------------------------------------
+ * Licensed under the BSD license, see LICENSE in PSPSDK root for details.
+ *
+ * main.c - Basic sample to erm do something.
+ *
+ * Copyright (c) 2005 Marcus R. Brown <mrbrown@ocgnet.org>
+ * Copyright (c) 2005 James Forshaw <tyranid@gmail.com>
+ * Copyright (c) 2005 John Kelley <ps2dev@kelley.ca>
+ *
+ * $Id: main.c 1095 2005-09-27 21:02:16Z jim $
+ */
+#include <pspkernel.h>
+#include <pspdebug.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Define the module info section */
+PSP_MODULE_INFO("PRXDecryptor", 0x1000, 1, 0);
+
+/* Define the main thread's attribute value (optional) */
+PSP_MAIN_THREAD_ATTR(0);
+
+/* Define printf, just to make typing easier */
+#define printf	pspDebugScreenPrintf
+
+/* Exit callback */
+int exit_callback(int arg1, int arg2, void *common)
+{
+	sceKernelExitGame();
+
+	return 0;
+}
+
+/* Callback thread */
+int CallbackThread(SceSize args, void *argp)
+{
+	int cbid;
+
+	cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
+	sceKernelRegisterExitCallback(cbid);
+
+	sceKernelSleepThreadCB();
+
+	return 0;
+}
+
+/* Sets up the callback thread and returns its thread id */
+int SetupCallbacks(void)
+{
+	int thid = 0;
+
+	thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, THREAD_ATTR_USER, 0);
+	if(thid >= 0)
+	{
+		sceKernelStartThread(thid, 0, 0);
+	}
+
+	return thid;
+}
+
+/* ptr is a pointer to the file to decrypt, check is undocumented, look at decrypt_file to see how to use */
+int sceKernelCheckExecFile(void *ptr, void *check);
+
+char g_data[0x400000] __attribute__((aligned(64)));
+char g_decrypt_buf[0x400000] __attribute__((aligned(64)));
+
+/* Decrypt a single PRX file */
+int extract_file(const char* name, const char* dstname)
+{
+	int fd;
+	int ret = 0;
+
+	fd = sceIoOpen(name, PSP_O_RDONLY, 0777);
+	if(fd >= 0)
+	{
+		int bytes_read;
+		bytes_read = sceIoRead(fd, g_data, 4*1024*1024);
+		sceIoClose(fd);
+		if(bytes_read > 0)
+		{
+			u8 check[0x100];
+			u32 size;
+			char *output;
+
+			memset(check, 0, sizeof(check));
+			sceKernelCheckExecFile(g_data, check);
+			/* Get size of data block */
+			size = *(unsigned int *) (check+0x5C);
+
+			/* Check if we managed to decrypt the file */
+			if(*(unsigned short *)(check+0x5a) & 1)
+			{
+				/* Set decrypt buffer pointer */
+				*(unsigned int*)(check+0x24) = (unsigned int) g_decrypt_buf;
+				sceKernelCheckExecFile(g_data, check);
+				output = g_decrypt_buf;
+			}
+			else
+			{
+				output = g_data;
+			}
+
+			if(size >= 0)
+			{
+				printf("Extracted file - size %d\n", size);
+				fd = sceIoOpen(dstname, PSP_O_WRONLY | PSP_O_CREAT | PSP_O_TRUNC, 0777);
+				if(fd >= 0)
+				{
+					sceIoWrite(fd, output, size);
+					sceIoClose(fd);
+					ret = 1;
+				}
+			}
+			else
+			{
+				printf("Extract failed %s\n", name);
+			}
+		}
+		else
+		{
+			printf("Couldn't read file\n");
+		}
+	}
+	else
+	{
+		printf("Couldn't open file\n");
+	}
+
+	return ret;
+}
+
+SceIoDirent g_dir;
+char g_infile[256];
+char g_outfile[256];
+
+void decrypt_files(const char *basedir, const char *destdir)
+{
+	int fd;
+
+	printf("%s\n", basedir);
+	fd = sceIoDopen(basedir);
+	if(fd >= 0)
+	{
+		while(sceIoDread(fd, &g_dir) > 0)
+		{
+			if((g_dir.d_stat.st_attr & FIO_SO_IFDIR) == 0)
+			{
+				strcpy(g_infile, basedir);
+				strcat(g_infile, g_dir.d_name);
+				strcpy(g_outfile, destdir);
+				strcat(g_outfile, g_dir.d_name);
+				printf("Decrypting %s to %s\n", g_infile, g_outfile);
+				extract_file(g_infile, g_outfile);
+			}
+		}
+
+		sceIoDclose(fd);
+	}
+}
+
+int main(void)
+{
+	pspDebugScreenInit();
+	SetupCallbacks();
+
+	/* Decrypt kernel modules */
+	sceIoMkdir("ms0:/kd", 0777);
+	decrypt_files("flash0:/kd/", "ms0:/kd/");
+	/* Decrypt VShell modules */
+	sceIoMkdir("ms0:/vsh", 0777);
+	decrypt_files("flash0:/vsh/module/", "ms0:/vsh/");
+
+	printf("Done\n");
+	sceKernelExitDeleteThread(0);
+
+	return 0;
+}