diff --git a/Android.mk b/Android.mk
index e353a4f..7670474 100644
--- a/Android.mk
+++ b/Android.mk
@@ -21,7 +21,8 @@ common_src_files := \
 	Loop.cpp \
 	Devmapper.cpp \
 	ResponseCode.cpp \
-	Xwarp.cpp
+	Xwarp.cpp \
+	cryptfs.c
 
 common_c_includes := \
 	$(KERNEL_HEADERS) \
diff --git a/CommandListener.cpp b/CommandListener.cpp
index bc6b9e0..ac46ac9 100644
--- a/CommandListener.cpp
+++ b/CommandListener.cpp
@@ -36,6 +36,7 @@
 #include "Xwarp.h"
 #include "Loop.h"
 #include "Devmapper.h"
+#include "cryptfs.h"
 
 CommandListener::CommandListener() :
                  FrameworkListener("vold") {
@@ -46,6 +47,7 @@ CommandListener::CommandListener() :
     registerCmd(new ShareCmd());
     registerCmd(new StorageCmd());
     registerCmd(new XwarpCmd());
+    registerCmd(new CryptfsCmd());
 }
 
 void CommandListener::dumpArgs(int argc, char **argv, int argObscure) {
@@ -55,7 +57,7 @@ void CommandListener::dumpArgs(int argc, char **argv, int argObscure) {
     memset(buffer, 0, sizeof(buffer));
     int i;
     for (i = 0; i < argc; i++) {
-        int len = strlen(argv[i]) + 1; // Account for space
+        unsigned int len = strlen(argv[i]) + 1; // Account for space
         if (i == argObscure) {
             len += 2; // Account for {}
         }
@@ -505,3 +507,46 @@ int CommandListener::XwarpCmd::runCommand(SocketClient *cli,
 
     return 0;
 }
+
+CommandListener::CryptfsCmd::CryptfsCmd() :
+                 VoldCommand("cryptfs") {
+}
+
+int CommandListener::CryptfsCmd::runCommand(SocketClient *cli,
+                                                      int argc, char **argv) {
+    dumpArgs(argc, argv, -1);
+
+    if (argc < 2) {
+        cli->sendMsg(ResponseCode::CommandSyntaxError, "Missing Argument", false);
+        return 0;
+    }
+
+    int rc = 0;
+
+    if (!strcmp(argv[1], "checkpw")) {
+        if (argc != 3) {
+            cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs checkpw <passwd>", false);
+            return 0;
+        }
+        rc = cryptfs_check_passwd(argv[2]);
+    } else if (!strcmp(argv[1], "enablecrypto")) {
+        if ( (argc != 4) || (strcmp(argv[2], "wipe") && strcmp(argv[2], "inplace")) ) {
+            cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs enablecrypto <wipe|inplace> <passwd>", false);
+            return 0;
+        }
+        rc = cryptfs_enable(argv[2], argv[3]);
+    } else {
+        cli->sendMsg(ResponseCode::CommandSyntaxError, "Unknown cryptfs cmd", false);
+    }
+
+    if (!rc) {
+        cli->sendMsg(ResponseCode::CommandOkay, "cryptfs operation succeeded", false);
+    } else {
+        int erno = errno;
+        rc = ResponseCode::convertFromErrno();
+        cli->sendMsg(rc, "cryptfs operation failed", true);
+    }
+
+    return 0;
+}
+
diff --git a/CommandListener.h b/CommandListener.h
index 75c7e81..7bae363 100644
--- a/CommandListener.h
+++ b/CommandListener.h
@@ -76,6 +76,13 @@ private:
         virtual ~XwarpCmd() {}
         int runCommand(SocketClient *c, int argc, char ** argv);
     };
+
+    class CryptfsCmd : public VoldCommand {
+    public:
+        CryptfsCmd();
+        virtual ~CryptfsCmd() {}
+        int runCommand(SocketClient *c, int argc, char ** argv);
+    };
 };
 
 #endif
diff --git a/cryptfs.c b/cryptfs.c
new file mode 100644
index 0000000..ac2cefd
--- /dev/null
+++ b/cryptfs.c
@@ -0,0 +1,845 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* TO DO:
+ *   1.  Perhaps keep several copies of the encrypted key, in case something
+ *       goes horribly wrong?
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <linux/dm-ioctl.h>
+#include <libgen.h>
+#include <stdlib.h>
+#include <sys/param.h>
+#include <string.h>
+#include <sys/mount.h>
+#include <openssl/evp.h>
+#include <errno.h>
+#include <sys/reboot.h>
+#include "cryptfs.h"
+#define LOG_TAG "Cryptfs"
+#include "cutils/log.h"
+#include "cutils/properties.h"
+
+#define DM_CRYPT_BUF_SIZE 4096
+
+char *me = "cryptfs";
+
+static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags)
+{
+    memset(io, 0, dataSize);
+    io->data_size = dataSize;
+    io->data_start = sizeof(struct dm_ioctl);
+    io->version[0] = 4;
+    io->version[1] = 0;
+    io->version[2] = 0;
+    io->flags = flags;
+    if (name) {
+        strncpy(io->name, name, sizeof(io->name));
+    }
+}
+
+static unsigned int get_blkdev_size(int fd)
+{
+  unsigned int nr_sec;
+
+  if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) {
+    nr_sec = 0;
+  }
+
+  return nr_sec;
+}
+
+/* key can be NULL, in which case just write out the footer.  Useful to
+ * update the failed mount count but not change the key.
+ */
+static int put_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr,
+                                  unsigned char *key)
+{
+  int fd;
+  unsigned int nr_sec, cnt;
+  off64_t off;
+  int rc = -1;
+
+  if ( (fd = open(real_blk_name, O_RDWR)) < 0) {
+    SLOGE("Cannot open real block device %s\n", real_blk_name);
+    return -1;
+  }
+
+  if ( (nr_sec = get_blkdev_size(fd)) == 0) {
+    SLOGE("Cannot get size of block device %s\n", real_blk_name);
+    goto errout;
+  }
+
+  /* If it's an encrypted Android partition, the last 16 Kbytes contain the
+   * encryption info footer and key, and plenty of bytes to spare for future
+   * growth.
+   */
+  off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET;
+
+  if (lseek64(fd, off, SEEK_SET) == -1) {
+    SLOGE("Cannot seek to real block device footer\n");
+    goto errout;
+  }
+
+  if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) {
+    SLOGE("Cannot write real block device footer\n");
+    goto errout;
+  }
+
+  if (key) {
+    if (crypt_ftr->keysize != 16) {
+      SLOGE("Keysize of %d bits not supported for real block device %s\n",
+            crypt_ftr->keysize * 8, real_blk_name);
+      goto errout; 
+    }
+
+    if ( (cnt = write(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) {
+      SLOGE("Cannot write key for real block device %s\n", real_blk_name);
+      goto errout;
+    }
+  }
+
+  /* Success! */
+  rc = 0;
+
+errout:
+  close(fd);
+  return rc;
+
+}
+
+static int get_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr,
+                                  unsigned char *key)
+{
+  int fd;
+  unsigned int nr_sec, cnt;
+  off64_t off;
+  int rc = -1;
+
+  if ( (fd = open(real_blk_name, O_RDWR)) < 0) {
+    SLOGE("Cannot open real block device %s\n", real_blk_name);
+    return -1;
+  }
+
+  if ( (nr_sec = get_blkdev_size(fd)) == 0) {
+    SLOGE("Cannot get size of block device %s\n", real_blk_name);
+    goto errout;
+  }
+
+  /* If it's an encrypted Android partition, the last 16 Kbytes contain the
+   * encryption info footer and key, and plenty of bytes to spare for future
+   * growth.
+   */
+#if 1 /* The real location, use when the enable code works */
+  off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET;
+#else
+  /* For testing, I'm slapping a handbuild header after my 200 megabyte
+   * /data partition.  So my offset if 200 megabytes */
+  off = 200*1024*1024;
+#endif
+
+  if (lseek64(fd, off, SEEK_SET) == -1) {
+    SLOGE("Cannot seek to real block device footer\n");
+    goto errout;
+  }
+
+  if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) {
+    SLOGE("Cannot read real block device footer\n");
+    goto errout;
+  }
+
+  if (crypt_ftr->magic != CRYPT_MNT_MAGIC) {
+    SLOGE("Bad magic for real block device %s\n", real_blk_name);
+    goto errout;
+  }
+
+  if (crypt_ftr->major_version != 1) {
+    SLOGE("Cannot understand major version %d real block device footer\n",
+          crypt_ftr->major_version);
+    goto errout;
+  }
+
+  if (crypt_ftr->minor_version != 0) {
+    SLOGW("Warning: crypto footer minor version %d, expected 0, continuing...\n",
+          crypt_ftr->minor_version);
+  }
+
+  if (crypt_ftr->ftr_size > sizeof(struct crypt_mnt_ftr)) {
+    /* the footer size is bigger than we expected.
+     * Skip to it's stated end so we can read the key.
+     */
+    if (lseek(fd, crypt_ftr->ftr_size - sizeof(struct crypt_mnt_ftr),  SEEK_CUR) == -1) {
+      SLOGE("Cannot seek to start of key\n");
+      goto errout;
+    }
+  }
+
+  if (crypt_ftr->keysize != 16) {
+    SLOGE("Keysize of %d bits not supported for real block device %s\n",
+          crypt_ftr->keysize * 8, real_blk_name);
+    goto errout;
+  }
+
+  if ( (cnt = read(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) {
+    SLOGE("Cannot read key for real block device %s\n", real_blk_name);
+    goto errout;
+  }
+
+  /* Success! */
+  rc = 0;
+
+errout:
+  close(fd);
+  return rc;
+}
+
+/* Convert a binary key of specified length into an ascii hex string equivalent,
+ * without the leading 0x and with null termination
+ */
+void convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize,
+                              char *master_key_ascii)
+{
+  unsigned int i, a;
+  unsigned char nibble;
+
+  for (i=0, a=0; i<keysize; i++, a+=2) {
+    /* For each byte, write out two ascii hex digits */
+    nibble = (master_key[i] >> 4) & 0xf;
+    master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30);
+
+    nibble = master_key[i] & 0xf;
+    master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30);
+  }
+
+  /* Add the null termination */
+  master_key_ascii[a] = '\0';
+
+}
+
+static int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key,
+                                    char *real_blk_name, char *crypto_blk_name)
+{
+  char buffer[DM_CRYPT_BUF_SIZE];
+  char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */
+  char *crypt_params;
+  struct dm_ioctl *io;
+  struct dm_target_spec *tgt;
+  unsigned int minor;
+  int fd;
+  int retval = -1;
+  char *name ="datadev"; /* FIX ME: Make me a parameter */
+
+  if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) {
+    SLOGE("Cannot open device-mapper\n");
+    goto errout;
+  }
+
+  io = (struct dm_ioctl *) buffer;
+
+  ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0);
+  if (ioctl(fd, DM_DEV_CREATE, io)) {
+    SLOGE("Cannot create dm-crypt device\n");
+    goto errout;
+  }
+
+  /* Get the device status, in particular, the name of it's device file */
+  ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0);
+  if (ioctl(fd, DM_DEV_STATUS, io)) {
+    SLOGE("Cannot retrieve dm-crypt device status\n");
+    goto errout;
+  }
+  minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00);
+  snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor);
+
+  /* Load the mapping table for this device */
+  tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)];
+
+  ioctl_init(io, 4096, name, 0);
+  io->target_count = 1;
+  tgt->status = 0;
+  tgt->sector_start = 0;
+  tgt->length = crypt_ftr->fs_size;
+  strcpy(tgt->target_type, "crypt");
+
+  crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec);
+  convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii);
+  sprintf(crypt_params, "%s %s 0 %s 0", crypt_ftr->crypto_type_name,
+          master_key_ascii, real_blk_name);
+  SLOGD("crypt_params = %s\n", crypt_params);
+  crypt_params += strlen(crypt_params) + 1;
+  crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */
+  tgt->next = crypt_params - buffer;
+
+  if (ioctl(fd, DM_TABLE_LOAD, io)) {
+      SLOGE("Cannot load dm-crypt mapping table.\n");
+      goto errout;
+  }
+
+  /* Resume this device to activate it */
+  ioctl_init(io, 4096, name, 0);
+
+  if (ioctl(fd, DM_DEV_SUSPEND, io)) {
+    SLOGE("Cannot resume the dm-crypt device\n");
+    goto errout;
+  }
+
+  /* We made it here with no errors.  Woot! */
+  retval = 0;
+
+errout:
+  close(fd);   /* If fd is <0 from a failed open call, it's safe to just ignore the close error */
+
+  return retval;
+}
+
+static int delete_crypto_blk_dev(char *crypto_blkdev)
+{
+  int fd;
+  char buffer[DM_CRYPT_BUF_SIZE];
+  struct dm_ioctl *io;
+  char *name ="datadev"; /* FIX ME: Make me a paraameter */
+  int retval = -1;
+
+  if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) {
+    SLOGE("Cannot open device-mapper\n");
+    goto errout;
+  }
+
+  io = (struct dm_ioctl *) buffer;
+
+  ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0);
+  if (ioctl(fd, DM_DEV_REMOVE, io)) {
+    SLOGE("Cannot remove dm-crypt device\n");
+    goto errout;
+  }
+
+  /* We made it here with no errors.  Woot! */
+  retval = 0;
+
+errout:
+  close(fd);    /* If fd is <0 from a failed open call, it's safe to just ignore the close error */
+
+  return retval;
+
+}
+
+/* If we need to debug this, look at Devmapper.cpp:dumpState(),
+ * It does DM_LIST_DEVICES, then iterates on each device and
+ * calls DM_DEV_STATUS.
+ */
+
+#define HASH_COUNT 2000
+#define KEY_LEN_BYTES 16
+#define IV_LEN_BYTES 16
+
+static int create_encrypted_random_key(char *passwd, unsigned char *master_key)
+{
+    int fd;
+    unsigned char buf[KEY_LEN_BYTES];
+    unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */
+    unsigned char salt[32] = { 0 };
+    EVP_CIPHER_CTX e_ctx;
+    int encrypted_len, final_len;
+
+    /* Get some random bits for a key */
+    fd = open("/dev/urandom", O_RDONLY);
+    read(fd, buf, sizeof(buf));
+    close(fd);
+
+    /* Now encrypt it with the password */
+    /* To Do: Make a salt based on some immutable data about this device.
+     * IMEI, or MEID, or CPU serial number, or whatever we can find
+     */
+    /* Turn the password into a key and IV that can decrypt the master key */
+    PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), salt, sizeof(salt),
+                           HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey);
+  
+    /* Initialize the decryption engine */
+    if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) {
+        SLOGE("EVP_EncryptInit failed\n");
+        return -1;
+    }
+    EVP_CIPHER_CTX_set_padding(&e_ctx, 0); /* Turn off padding as our data is block aligned */
+    /* Encrypt the master key */
+    if (! EVP_EncryptUpdate(&e_ctx, master_key, &encrypted_len,
+                              buf, KEY_LEN_BYTES)) {
+        SLOGE("EVP_EncryptUpdate failed\n");
+        return -1;
+    }
+    if (! EVP_EncryptFinal(&e_ctx, master_key + encrypted_len, &final_len)) {
+        SLOGE("EVP_EncryptFinal failed\n");
+        return -1;
+    }
+
+    if (encrypted_len + final_len != KEY_LEN_BYTES) {
+        SLOGE("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len);
+        return -1;
+    } else {
+        return 0;
+    }
+}
+
+static int decrypt_master_key(char *passwd, unsigned char *encrypted_master_key,
+                              unsigned char *decrypted_master_key)
+{
+  unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */
+  unsigned char salt[32] = { 0 };
+  EVP_CIPHER_CTX d_ctx;
+  int decrypted_len, final_len;
+
+  /* To Do: Make a salt based on some immutable data about this device.
+   * IMEI, or MEID, or CPU serial number, or whatever we can find
+   */
+  /* Turn the password into a key and IV that can decrypt the master key */
+  PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), salt, sizeof(salt),
+                         HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey);
+
+  /* Initialize the decryption engine */
+  if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) {
+    return -1;
+  }
+  EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */
+  /* Decrypt the master key */
+  if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len,
+                            encrypted_master_key, KEY_LEN_BYTES)) {
+    return -1;
+  }
+  if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) {
+    return -1;
+  }
+
+  if (decrypted_len + final_len != KEY_LEN_BYTES) {
+    return -1;
+  } else {
+    return 0;
+  }
+}
+
+static int get_orig_mount_parms(char *mount_point, char *fs_type, char *real_blkdev,
+                                unsigned long *mnt_flags, char *fs_options)
+{
+  char mount_point2[32];
+  char fs_flags[32];
+
+  property_get("ro.crypto.fs_type", fs_type, "");
+  property_get("ro.crypto.fs_real_blkdev", real_blkdev, "");
+  property_get("ro.crypto.fs_mnt_point", mount_point2, "");
+  property_get("ro.crypto.fs_options", fs_options, "");
+  property_get("ro.crypto.fs_flags", fs_flags, "");
+  *mnt_flags = strtol(fs_flags, 0, 0);
+
+  if (strcmp(mount_point, mount_point2)) {
+    /* Consistency check.  These should match. If not, something odd happened. */
+    return -1;
+  }
+
+  return 0;
+}
+
+static int wait_and_unmount(char *mountpoint)
+{
+    int i, rc;
+#define WAIT_UNMOUNT_COUNT 100
+
+    /*  Now umount the tmpfs filesystem */
+    for (i=0; i<WAIT_UNMOUNT_COUNT; i++) {
+        if (umount(mountpoint)) {
+            sleep(1);
+            i++;
+        } else {
+          break;
+        }
+    }
+
+    if (i < WAIT_UNMOUNT_COUNT) {
+      SLOGD("unmounting %s succeeded\n", mountpoint);
+      rc = 0;
+    } else {
+      SLOGE("unmounting %s failed\n", mountpoint);
+      rc = -1;
+    }
+
+    return rc;
+}
+
+static int cryptfs_restart(char *crypto_blkdev)
+{
+    char fs_type[32];
+    char real_blkdev[MAXPATHLEN];
+    char fs_options[256];
+    unsigned long mnt_flags;
+    struct stat statbuf;
+    int rc = -1, i;
+#define DATA_PREP_TIMEOUT 100
+
+    /* Here is where we shut down the framework.  The init scripts
+     * start all services in one of three classes: core, main or late_start.
+     * On boot, we start core and main.  Now, we stop main, but not core,
+     * as core includes vold and a few other really important things that
+     * we need to keep running.  Once main has stopped, we should be able
+     * to umount the tmpfs /data, then mount the encrypted /data.
+     * We then restart the class main, and also the class late_start.
+     * At the moment, I've only put a few things in late_start that I know
+     * are not needed to bring up the framework, and that also cause problems
+     * with unmounting the tmpfs /data, but I hope to add add more services
+     * to the late_start class as we optimize this to decrease the delay
+     * till the user is asked for the password to the filesystem.
+     */
+
+    /* The init files are setup to stop the class main when vold.decrypt is
+     * set to trigger_reset_main.
+     */
+    property_set("vold.decrypt", "trigger_reset_main");
+    SLOGD("Just asked init to shut down class main\n");
+
+    /* Now that the framework is shutdown, we should be able to umount()
+     * the tmpfs filesystem, and mount the real one.
+     */
+
+    if (! get_orig_mount_parms("/data", fs_type, real_blkdev, &mnt_flags, fs_options)) {
+        SLOGD("Just got orig mount parms\n");
+
+        if (! (rc = wait_and_unmount("/data")) ) {
+            /* If that succeeded, then mount the decrypted filesystem */
+            mount(crypto_blkdev, "/data", fs_type, mnt_flags, fs_options);
+
+            /* Do the prep of the /data filesystem */
+            property_set("vold.post_fs_data_done", "0");
+            property_set("vold.decrypt", "trigger_post_fs_data");
+            SLOGD("Just triggered post_fs_data\n");
+
+            /* Wait a max of 25 seconds, hopefully it takes much less */
+            for (i=0; i<DATA_PREP_TIMEOUT; i++) {
+                char p[16];;
+
+                property_get("vold.post_fs_data_done", p, "0");
+                if (*p == '1') {
+                    break;
+                } else {
+                    usleep(250000);
+                }
+            }
+            if (i == DATA_PREP_TIMEOUT) {
+                /* Ugh, we failed to prep /data in time.  Bail. */
+                return -1;
+            }
+
+            /* startup service classes main and late_start */
+            property_set("vold.decrypt", "trigger_restart_framework");
+            SLOGD("Just triggered restart_framework\n");
+
+            /* Give it a few moments to get started */
+            sleep(1);
+        }
+    }
+
+    return rc;
+}
+
+static int test_mount_encrypted_fs(char *passwd, char *mount_point)
+{
+  struct crypt_mnt_ftr crypt_ftr;
+  /* Allocate enough space for a 256 bit key, but we may use less */
+  unsigned char encrypted_master_key[32], decrypted_master_key[32];
+  char crypto_blkdev[MAXPATHLEN];
+  char real_blkdev[MAXPATHLEN];
+  char fs_type[32];
+  char fs_options[256];
+  char tmp_mount_point[64];
+  unsigned long mnt_flags;
+  unsigned int orig_failed_decrypt_count;
+  int rc;
+
+  if (get_orig_mount_parms(mount_point, fs_type, real_blkdev, &mnt_flags, fs_options)) {
+    SLOGE("Error reading original mount parms for mount point %s\n", mount_point);
+    return -1;
+  }
+
+  if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key)) {
+    SLOGE("Error getting crypt footer and key\n");
+    return -1;
+  }
+  SLOGD("crypt_ftr->fs_size = %lld\n", crypt_ftr.fs_size);
+  orig_failed_decrypt_count = crypt_ftr.failed_decrypt_count;
+
+  if (! (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) ) {
+    decrypt_master_key(passwd, encrypted_master_key, decrypted_master_key);
+  }
+
+  if (create_crypto_blk_dev(&crypt_ftr, decrypted_master_key,
+                               real_blkdev, crypto_blkdev)) {
+    SLOGE("Error creating decrypted block device\n");
+    return -1;
+  }
+
+  /* If init detects an encrypted filesystme, it writes a file for each such
+   * encrypted fs into the tmpfs /data filesystem, and then the framework finds those
+   * files and passes that data to me */
+  /* Create a tmp mount point to try mounting the decryptd fs
+   * Since we're here, the mount_point should be a tmpfs filesystem, so make
+   * a directory in it to test mount the decrypted filesystem.
+   */
+  sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point);
+  mkdir(tmp_mount_point, 0755);
+  if ( mount(crypto_blkdev, tmp_mount_point, "ext4", MS_RDONLY, "") ) {
+    SLOGE("Error temp mounting decrypted block device\n");
+    delete_crypto_blk_dev(crypto_blkdev);
+    crypt_ftr.failed_decrypt_count++;
+  } else {
+    /* Success, so just umount and we'll mount it properly when we restart
+     * the framework.
+     */
+    umount(tmp_mount_point);
+    crypt_ftr.failed_decrypt_count  = 0;
+  }
+
+  if (orig_failed_decrypt_count != crypt_ftr.failed_decrypt_count) {
+    put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, 0);
+  }
+
+  if (crypt_ftr.failed_decrypt_count) {
+    /* We failed to mount the device, so return an error */
+    rc = crypt_ftr.failed_decrypt_count;
+
+  } else {
+    /* Woot!  Success!  Time to do the magic of unmounting the tmpfs
+     * disk and mounting the encrypted one.
+     */
+    rc = cryptfs_restart(crypto_blkdev);
+  }
+
+  return rc;
+}
+
+int cryptfs_check_passwd(char *passwd)
+{
+    int rc = -1;
+
+    rc = test_mount_encrypted_fs(passwd, "/data");
+
+    return rc;
+}
+
+/* Initialize a crypt_mnt_ftr structure.  The keysize is
+ * defaulted to 16 bytes, and the filesystem size to 0.
+ * Presumably, at a minimum, the caller will update the
+ * filesystem size and crypto_type_name after calling this function.
+ */
+static void cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr)
+{
+    ftr->magic = CRYPT_MNT_MAGIC;
+    ftr->major_version = 1;
+    ftr->minor_version = 0;
+    ftr->ftr_size = sizeof(struct crypt_mnt_ftr);
+    ftr->flags = 0;
+    ftr->keysize = 16;
+    ftr->spare1 = 0;
+    ftr->fs_size = 0;
+    ftr->failed_decrypt_count = 0;
+    ftr->crypto_type_name[0] = '\0';
+}
+
+static int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size)
+{
+    char cmdline[256];
+    int rc = -1;
+
+    snprintf(cmdline, sizeof(cmdline), "/system/bin/make_ext4fs -a /data -l %lld %s",
+             size * 512, crypto_blkdev);
+    SLOGI("Making empty filesystem with command %s\n", cmdline);
+    if (system(cmdline)) {
+      SLOGE("Error creating empty filesystem on %s\n", crypto_blkdev);
+    } else {
+      SLOGD("Successfully created empty filesystem on %s\n", crypto_blkdev);
+      rc = 0;
+    }
+
+    return rc;
+}
+
+static inline int unix_read(int  fd, void*  buff, int  len)
+{
+    int  ret;
+    do { ret = read(fd, buff, len); } while (ret < 0 && errno == EINTR);
+    return ret;
+}
+
+static inline int unix_write(int  fd, const void*  buff, int  len)
+{
+    int  ret;
+    do { ret = write(fd, buff, len); } while (ret < 0 && errno == EINTR);
+    return ret;
+}
+
+#define CRYPT_INPLACE_BUFSIZE 4096
+#define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / 512)
+static int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_t size)
+{
+    int realfd, cryptofd;
+    char *buf[CRYPT_INPLACE_BUFSIZE];
+    int rc = -1;
+    off64_t numblocks, i, remainder;
+   
+    if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { 
+        SLOGE("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev);
+        return -1;
+    }
+
+    if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { 
+        SLOGE("Error opening crypto_blkdev %s for inplace encrypt\n", crypto_blkdev);
+        close(realfd);
+        return -1;
+    }
+
+    /* This is pretty much a simple loop of reading 4K, and writing 4K.
+     * The size passed in is the number of 512 byte sectors in the filesystem.
+     * So compute the number of whole 4K blocks we should read/write,
+     * and the remainder.
+     */
+    numblocks = size / CRYPT_SECTORS_PER_BUFSIZE;
+    remainder = size % CRYPT_SECTORS_PER_BUFSIZE;
+
+    SLOGE("Encrypting filesystem in place...");
+
+    /* process the majority of the filesystem in blocks */
+    for (i=0; i<numblocks; i++) {
+        if ( ! (i % 65536)) { //KEN
+            SLOGE("|"); //KEN
+        } //KEN
+        if (unix_read(realfd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) {
+            SLOGE("Error reading real_blkdev %s for inplace encrypt\n", crypto_blkdev);
+            goto errout;
+        }
+        if (unix_write(cryptofd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) {
+            SLOGE("Error writing crypto_blkdev %s for inplace encrypt\n", crypto_blkdev);
+            goto errout;
+        }
+    }
+
+    /* Do any remaining sectors */
+    for (i=0; i<remainder; i++) {
+        if (unix_read(realfd, buf, 512) <= 0) {
+            SLOGE("Error reading rival sectors from real_blkdev %s for inplace encrypt\n", crypto_blkdev);
+            goto errout;
+        }
+        if (unix_write(cryptofd, buf, 512) <= 0) {
+            SLOGE("Error writing final sectors to crypto_blkdev %s for inplace encrypt\n", crypto_blkdev);
+            goto errout;
+        }
+    }
+
+    rc = 0;
+
+errout:
+    close(realfd);
+    close(cryptofd);
+
+    return rc;
+}
+
+#define CRYPTO_ENABLE_WIPE 1
+#define CRYPTO_ENABLE_INPLACE 2
+int cryptfs_enable(char *howarg, char *passwd)
+{
+    int how = 0;
+    char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN];
+    char fs_type[32], fs_options[256], mount_point[32];
+    unsigned long mnt_flags, nr_sec;
+    unsigned char master_key[16], decrypted_master_key[16];
+    int rc, fd;
+    struct crypt_mnt_ftr crypt_ftr;
+
+    if (!strcmp(howarg, "wipe")) {
+      how = CRYPTO_ENABLE_WIPE;
+    } else if (! strcmp(howarg, "inplace")) {
+      how = CRYPTO_ENABLE_INPLACE;
+    } else {
+      /* Shouldn't happen, as CommandListener vets the args */
+      return -1;
+    }
+
+    get_orig_mount_parms(mount_point, fs_type, real_blkdev, &mnt_flags, fs_options);
+
+    /* The init files are setup to stop the class main and late start when
+     * set to 4.  They also unmount the fuse filesystem /mnt/sdcard on stingray.
+     */
+    property_set("vold.decrypt", "trigger_shutdown_framework");
+    SLOGD("Just asked init to shut down class main\n");
+
+    /* Temporary hack FIX ME!*/
+    sleep(30);
+    umount("/mnt/sdcard");
+
+    /* Now unmount the /data partition. */
+    if (! (rc = wait_and_unmount("/data")) ) {
+        /* OK, we've unmounted /data, time to setup an encrypted
+         * mapping, and either write a new filesystem or encrypt
+         * in place.
+         */
+
+        fd = open(real_blkdev, O_RDONLY);
+        if ( (nr_sec = get_blkdev_size(fd)) == 0) {
+            SLOGE("Cannot get size of block device %s\n", real_blkdev);
+            return -1;
+        }
+        close(fd);
+
+        /* Initialize a crypt_mnt_ftr for the partition */
+        cryptfs_init_crypt_mnt_ftr(&crypt_ftr);
+        crypt_ftr.fs_size = nr_sec - (CRYPT_FOOTER_OFFSET / 512);
+        strcpy((char *)crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256");
+
+        /* Make an encrypted master key */
+        if (create_encrypted_random_key(passwd, master_key)) {
+            SLOGE("Cannot create encrypted master key\n");
+            return -1;
+        }
+
+        /* Write the key to the end of the partition */
+        put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, master_key);
+
+        decrypt_master_key(passwd, master_key, decrypted_master_key);
+        create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, real_blkdev, crypto_blkdev);
+
+        if (how == CRYPTO_ENABLE_WIPE) {
+            rc = cryptfs_enable_wipe(crypto_blkdev, crypt_ftr.fs_size);
+        } else if (how == CRYPTO_ENABLE_INPLACE) {
+            rc = cryptfs_enable_inplace(crypto_blkdev, real_blkdev, crypt_ftr.fs_size);
+        } else {
+            /* Shouldn't happen */
+            SLOGE("cryptfs_enable: internal error, unknown option\n");
+            return -1;
+        }
+
+        if (! rc) {
+            delete_crypto_blk_dev(crypto_blkdev);
+            sync();
+            reboot(LINUX_REBOOT_CMD_RESTART);
+        }
+    } else {
+        return -1;
+    }
+
+    return 0;
+}
+
diff --git a/cryptfs.h b/cryptfs.h
new file mode 100644
index 0000000..32f1724
--- /dev/null
+++ b/cryptfs.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* This structure starts 16,384 bytes before the end of a hardware
+ * partition that is encrypted.
+ * Immediately following this structure is the encrypted key.
+ * Obviously, the filesystem does not include the last 16 kbytes
+ * of the partition.
+ */
+
+#define CRYPT_FOOTER_OFFSET 0x4000
+
+#define MAX_CRYPTO_TYPE_NAME_LEN 64
+
+/* definitions of flags in the structure below */
+#define CRYPT_MNT_KEY_UNENCRYPTED 0x1 /* The key for the partition is not encrypted. */
+
+#define CRYPT_MNT_MAGIC 0xD0B5B1C4
+
+#define __le32 unsigned int
+#define __le16 unsigned short int 
+
+struct crypt_mnt_ftr {
+  __le32 magic;		/* See above */
+  __le16 major_version;
+  __le16 minor_version;
+  __le32 ftr_size; 	/* in bytes, not including key following */
+  __le32 flags;		/* See above */
+  __le32 keysize;	/* in bytes */
+  __le32 spare1;	/* ignored */
+  __le64 fs_size;	/* Size of the encrypted fs, in 512 byte sectors */
+  __le32 failed_decrypt_count; /* count of # of failed attempts to decrypt and
+				  mount, set to 0 on successful mount */
+  unsigned char crypto_type_name[MAX_CRYPTO_TYPE_NAME_LEN]; /* The type of encryption
+							       needed to decrypt this
+							       partition, null terminated */
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  int cryptfs_check_passwd(char *pw);
+  int cryptfs_enable(char *flag, char *passwd);
+#ifdef __cplusplus
+}
+#endif
+