1 files changed, 884 insertions, 320 deletions

diff --git a/crypto/jb/cryptfs.c b/crypto/jb/cryptfs.c
index be6c476b8..4e5706b64 100644
--- a/crypto/jb/cryptfs.c
+++ b/crypto/jb/cryptfs.c
@@ -21,6 +21,7 @@
  */
 
 #include <sys/types.h>
+#include <sys/wait.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
@@ -35,17 +36,19 @@
 #include <openssl/evp.h>
 #include <openssl/sha.h>
 #include <errno.h>
-#include <cutils/android_reboot.h>
 #include <ext4.h>
 #include <linux/kdev_t.h>
-#include "../fs_mgr/include/fs_mgr.h"
+#include <fs_mgr.h>
 #include "cryptfs.h"
 #define LOG_TAG "Cryptfs"
-#include "cutils/android_reboot.h"
 #include "cutils/log.h"
 #include "cutils/properties.h"
+#include "cutils/android_reboot.h"
 #include "hardware_legacy/power.h"
-//#include "VolumeManager.h"
+/*#include <logwrap/logwrap.h>
+#include "VolumeManager.h"
+#include "VoldUtil.h"*/
+#include "crypto_scrypt.h"
 
 #define DM_CRYPT_BUF_SIZE 4096
 #define DATA_MNT_POINT "/data"
@@ -59,14 +62,29 @@
 #define EXT4_FS 1
 #define FAT_FS 2
 
+#define TABLE_LOAD_RETRIES 10
+
 char *me = "cryptfs";
 
 static unsigned char saved_master_key[KEY_LEN_BYTES];
-static char *saved_data_blkdev;
 static char *saved_mount_point;
 static int  master_key_saved = 0;
-#define FSTAB_PREFIX "/fstab."
-static char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)];
+static struct crypt_persist_data *persist_data = NULL;
+
+struct fstab *fstab;
+
+static void cryptfs_reboot(int recovery)
+{
+    /*if (recovery) {
+        property_set(ANDROID_RB_PROPERTY, "reboot,recovery");
+    } else {
+        property_set(ANDROID_RB_PROPERTY, "reboot");
+    }
+    sleep(20);*/
+
+    /* Shouldn't get here, reboot should happen before sleep times out */
+    return;
+}
 
 static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags)
 {
@@ -82,6 +100,56 @@ static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, u
     }
 }
 
+/**
+ * Gets the default device scrypt parameters for key derivation time tuning.
+ * The parameters should lead to about one second derivation time for the
+ * given device.
+ */
+static void get_device_scrypt_params(struct crypt_mnt_ftr *ftr) {
+    const int default_params[] = SCRYPT_DEFAULTS;
+    int params[] = SCRYPT_DEFAULTS;
+    char paramstr[PROPERTY_VALUE_MAX];
+    char *token;
+    char *saveptr;
+    int i;
+
+    property_get(SCRYPT_PROP, paramstr, "");
+    if (paramstr[0] != '\0') {
+        /*
+         * The token we're looking for should be three integers separated by
+         * colons (e.g., "12:8:1"). Scan the property to make sure it matches.
+         */
+        for (i = 0, token = strtok_r(paramstr, ":", &saveptr);
+                token != NULL && i < 3;
+                i++, token = strtok_r(NULL, ":", &saveptr)) {
+            char *endptr;
+            params[i] = strtol(token, &endptr, 10);
+
+            /*
+             * Check that there was a valid number and it's 8-bit. If not,
+             * break out and the end check will take the default values.
+             */
+            if ((*token == '\0') || (*endptr != '\0') || params[i] < 0 || params[i] > 255) {
+                break;
+            }
+        }
+
+        /*
+         * If there were not enough tokens or a token was malformed (not an
+         * integer), it will end up here and the default parameters can be
+         * taken.
+         */
+        if ((i != 3) || (token != NULL)) {
+            printf("bad scrypt parameters '%s' should be like '12:8:1'; using defaults", paramstr);
+            memcpy(params, default_params, sizeof(params));
+        }
+    }
+
+    ftr->N_factor = params[0];
+    ftr->r_factor = params[1];
+    ftr->p_factor = params[2];
+}
+
 static unsigned int get_fs_size(char *dev)
 {
     int fd, block_size;
@@ -89,17 +157,17 @@ static unsigned int get_fs_size(char *dev)
     off64_t len;
 
     if ((fd = open(dev, O_RDONLY)) < 0) {
-        SLOGE("Cannot open device to get filesystem size ");
+        printf("Cannot open device to get filesystem size ");
         return 0;
     }
 
     if (lseek64(fd, 1024, SEEK_SET) < 0) {
-        SLOGE("Cannot seek to superblock");
+        printf("Cannot seek to superblock");
         return 0;
     }
 
     if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) {
-        SLOGE("Cannot read superblock");
+        printf("Cannot read superblock");
         return 0;
     }
 
@@ -124,108 +192,102 @@ static unsigned int get_blkdev_size(int fd)
   return nr_sec;
 }
 
-/* Get and cache the name of the fstab file so we don't
- * keep talking over the socket to the property service.
- */
-static char *get_fstab_filename(void)
+static int get_crypt_ftr_info(char **metadata_fname, off64_t *off)
 {
-    if (fstab_filename[0] == 0) {
-        strcpy(fstab_filename, FSTAB_PREFIX);
-        property_get("ro.hardware", fstab_filename + sizeof(FSTAB_PREFIX) - 1, "");
+  static int cached_data = 0;
+  static off64_t cached_off = 0;
+  static char cached_metadata_fname[PROPERTY_VALUE_MAX] = "";
+  int fd;
+  char key_loc[PROPERTY_VALUE_MAX];
+  char real_blkdev[PROPERTY_VALUE_MAX];
+  unsigned int nr_sec;
+  int rc = -1;
+
+  if (!cached_data) {
+    fs_mgr_get_crypt_info(fstab, key_loc, real_blkdev, sizeof(key_loc));
+
+    if (!strcmp(key_loc, KEY_IN_FOOTER)) {
+      if ( (fd = open(real_blkdev, O_RDWR)) < 0) {
+        printf("Cannot open real block device %s\n", real_blkdev);
+        return -1;
+      }
+
+      if ((nr_sec = get_blkdev_size(fd))) {
+        /* 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.
+         */
+        strlcpy(cached_metadata_fname, real_blkdev, sizeof(cached_metadata_fname));
+        cached_off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET;
+        cached_data = 1;
+      } else {
+        printf("Cannot get size of block device %s\n", real_blkdev);
+      }
+      close(fd);
+    } else {
+      strlcpy(cached_metadata_fname, key_loc, sizeof(cached_metadata_fname));
+      cached_off = 0;
+      cached_data = 1;
+    }
+  }
+
+  if (cached_data) {
+    if (metadata_fname) {
+        *metadata_fname = cached_metadata_fname;
     }
+    if (off) {
+        *off = cached_off;
+    }
+    rc = 0;
+  }
 
-    return fstab_filename;
+  return rc;
 }
 
 /* key or salt can be NULL, in which case just skip writing that value.  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, unsigned char *salt)
+static int put_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr)
 {
   int fd;
   unsigned int nr_sec, cnt;
-  off64_t off;
+  /* starting_off is set to the SEEK_SET offset
+   * where the crypto structure starts
+   */
+  off64_t starting_off;
   int rc = -1;
-  char *fname;
-  char key_loc[PROPERTY_VALUE_MAX];
+  char *fname = NULL;
   struct stat statbuf;
 
-  fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc));
-
-  if (!strcmp(key_loc, KEY_IN_FOOTER)) {
-    fname = real_blk_name;
-    if ( (fd = open(fname, O_RDWR)) < 0) {
-      SLOGE("Cannot open real block device %s\n", fname);
-      return -1;
-    }
-
-    if ( (nr_sec = get_blkdev_size(fd)) == 0) {
-      SLOGE("Cannot get size of block device %s\n", fname);
-      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;
-    }
-  } else if (key_loc[0] == '/') {
-    fname = key_loc;
-    if ( (fd = open(fname, O_RDWR | O_CREAT, 0600)) < 0) {
-      SLOGE("Cannot open footer file %s\n", fname);
-      return -1;
-    }
-  } else {
-    SLOGE("Unexpected value for crypto key location\n");
-    return -1;;
+  if (get_crypt_ftr_info(&fname, &starting_off)) {
+    printf("Unable to get crypt_ftr_info\n");
+    return -1;
   }
-
-  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 (fname[0] != '/') {
+    printf("Unexpected value for crypto key location\n");
+    return -1;
   }
-
-  if (key) {
-    if (crypt_ftr->keysize != KEY_LEN_BYTES) {
-      SLOGE("Keysize of %d bits not supported for real block device %s\n",
-            crypt_ftr->keysize*8, fname);
-      goto errout; 
-    }
-
-    if ( (cnt = write(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) {
-      SLOGE("Cannot write key for real block device %s\n", fname);
-      goto errout;
-    }
+  if ( (fd = open(fname, O_RDWR | O_CREAT, 0600)) < 0) {
+    printf("Cannot open footer file %s for put\n", fname);
+    return -1;
   }
 
-  if (salt) {
-    /* Compute the offset from the last write to the salt */
-    off = KEY_TO_SALT_PADDING;
-    if (! key)
-      off += crypt_ftr->keysize;
-
-    if (lseek64(fd, off, SEEK_CUR) == -1) {
-      SLOGE("Cannot seek to real block device salt \n");
-      goto errout;
-    }
+  /* Seek to the start of the crypt footer */
+  if (lseek64(fd, starting_off, SEEK_SET) == -1) {
+    printf("Cannot seek to real block device footer\n");
+    goto errout;
+  }
 
-    if ( (cnt = write(fd, salt, SALT_LEN)) != SALT_LEN) {
-      SLOGE("Cannot write salt for real block device %s\n", fname);
-      goto errout;
-    }
+  if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) {
+    printf("Cannot write real block device footer\n");
+    goto errout;
   }
 
   fstat(fd, &statbuf);
   /* If the keys are kept on a raw block device, do not try to truncate it. */
-  if (S_ISREG(statbuf.st_mode) && (key_loc[0] == '/')) {
+  if (S_ISREG(statbuf.st_mode)) {
     if (ftruncate(fd, 0x4000)) {
-      SLOGE("Cannot set footer file size\n", fname);
+      printf("Cannot set footer file size\n", fname);
       goto errout;
     }
   }
@@ -239,111 +301,145 @@ errout:
 
 }
 
-static int get_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr,
-                                  unsigned char *key, unsigned char *salt)
+static inline int unix_read(int  fd, void*  buff, int  len)
 {
-  int fd;
-  unsigned int nr_sec, cnt;
-  off64_t off;
-  int rc = -1;
-  char key_loc[PROPERTY_VALUE_MAX];
-  char *fname;
-  struct stat statbuf;
-
-  fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc));
+    return TEMP_FAILURE_RETRY(read(fd, buff, len));
+}
 
-  if (!strcmp(key_loc, KEY_IN_FOOTER)) {
-    fname = real_blk_name;
-    if ( (fd = open(fname, O_RDONLY)) < 0) {
-      SLOGE("Cannot open real block device %s\n", fname);
-      return -1;
-    }
+static inline int unix_write(int  fd, const void*  buff, int  len)
+{
+    return TEMP_FAILURE_RETRY(write(fd, buff, len));
+}
 
-    if ( (nr_sec = get_blkdev_size(fd)) == 0) {
-      SLOGE("Cannot get size of block device %s\n", fname);
-      goto errout;
-    }
+static void init_empty_persist_data(struct crypt_persist_data *pdata, int len)
+{
+    memset(pdata, 0, len);
+    pdata->persist_magic = PERSIST_DATA_MAGIC;
+    pdata->persist_valid_entries = 0;
+}
 
-    /* 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;
+/* A routine to update the passed in crypt_ftr to the lastest version.
+ * fd is open read/write on the device that holds the crypto footer and persistent
+ * data, crypt_ftr is a pointer to the struct to be updated, and offset is the
+ * absolute offset to the start of the crypt_mnt_ftr on the passed in fd.
+ */
+static void upgrade_crypt_ftr(int fd, struct crypt_mnt_ftr *crypt_ftr, off64_t offset)
+{
+    int orig_major = crypt_ftr->major_version;
+    int orig_minor = crypt_ftr->minor_version;
+    return; // in recovery we don't want to upgrade
+    if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 0)) {
+        struct crypt_persist_data *pdata;
+        off64_t pdata_offset = offset + CRYPT_FOOTER_TO_PERSIST_OFFSET;
+
+        printf("upgrading crypto footer to 1.1");
+
+        pdata = malloc(CRYPT_PERSIST_DATA_SIZE);
+        if (pdata == NULL) {
+            printf("Cannot allocate persisent data\n");
+            return;
+        }
+        memset(pdata, 0, CRYPT_PERSIST_DATA_SIZE);
 
-    if (lseek64(fd, off, SEEK_SET) == -1) {
-      SLOGE("Cannot seek to real block device footer\n");
-      goto errout;
+        /* Need to initialize the persistent data area */
+        if (lseek64(fd, pdata_offset, SEEK_SET) == -1) {
+            printf("Cannot seek to persisent data offset\n");
+            return;
+        }
+        /* Write all zeros to the first copy, making it invalid */
+        unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE);
+
+        /* Write a valid but empty structure to the second copy */
+        init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE);
+        unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE);
+
+        /* Update the footer */
+        crypt_ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE;
+        crypt_ftr->persist_data_offset[0] = pdata_offset;
+        crypt_ftr->persist_data_offset[1] = pdata_offset + CRYPT_PERSIST_DATA_SIZE;
+        crypt_ftr->minor_version = 1;
     }
-  } else if (key_loc[0] == '/') {
-    fname = key_loc;
-    if ( (fd = open(fname, O_RDONLY)) < 0) {
-      SLOGE("Cannot open footer file %s\n", fname);
-      return -1;
+
+    if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version)) {
+        printf("upgrading crypto footer to 1.2");
+        crypt_ftr->kdf_type = KDF_PBKDF2;
+        get_device_scrypt_params(crypt_ftr);
+        crypt_ftr->minor_version = 2;
     }
 
-    /* Make sure it's 16 Kbytes in length */
-    fstat(fd, &statbuf);
-    if (S_ISREG(statbuf.st_mode) && (statbuf.st_size != 0x4000)) {
-      SLOGE("footer file %s is not the expected size!\n", fname);
-      goto errout;
+    if ((orig_major != crypt_ftr->major_version) || (orig_minor != crypt_ftr->minor_version)) {
+        if (lseek64(fd, offset, SEEK_SET) == -1) {
+            printf("Cannot seek to crypt footer\n");
+            return;
+        }
+        unix_write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr));
     }
-  } else {
-    SLOGE("Unexpected value for crypto key location\n");
-    return -1;;
-  }
+}
 
-  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", fname);
-    goto errout;
-  }
+static int get_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr)
+{
+  int fd;
+  unsigned int nr_sec, cnt;
+  off64_t starting_off;
+  int rc = -1;
+  char *fname = NULL;
+  struct stat statbuf;
 
-  if (crypt_ftr->major_version != 1) {
-    SLOGE("Cannot understand major version %d real block device footer\n",
-          crypt_ftr->major_version);
-    goto errout;
+  if (get_crypt_ftr_info(&fname, &starting_off)) {
+    printf("Unable to get crypt_ftr_info\n");
+    return -1;
   }
-
-  if (crypt_ftr->minor_version != 0) {
-    SLOGW("Warning: crypto footer minor version %d, expected 0, continuing...\n",
-          crypt_ftr->minor_version);
+  if (fname[0] != '/') {
+    printf("Unexpected value for crypto key location\n");
+    return -1;
+  }
+  if ( (fd = open(fname, O_RDWR)) < 0) {
+    printf("Cannot open footer file %s for get\n", fname);
+    return -1;
   }
 
-  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 (lseek64(fd, crypt_ftr->ftr_size - sizeof(struct crypt_mnt_ftr),  SEEK_CUR) == -1) {
-      SLOGE("Cannot seek to start of key\n");
-      goto errout;
-    }
+  /* Make sure it's 16 Kbytes in length */
+  fstat(fd, &statbuf);
+  if (S_ISREG(statbuf.st_mode) && (statbuf.st_size != 0x4000)) {
+    printf("footer file %s is not the expected size!\n", fname);
+    goto errout;
   }
 
-  if (crypt_ftr->keysize != KEY_LEN_BYTES) {
-    SLOGE("Keysize of %d bits not supported for real block device %s\n",
-          crypt_ftr->keysize * 8, fname);
+  /* Seek to the start of the crypt footer */
+  if (lseek64(fd, starting_off, SEEK_SET) == -1) {
+    printf("Cannot seek to real block device footer\n");
     goto errout;
   }
 
-  if ( (cnt = read(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) {
-    SLOGE("Cannot read key for real block device %s\n", fname);
+  if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) {
+    printf("Cannot read real block device footer\n");
     goto errout;
   }
 
-  if (lseek64(fd, KEY_TO_SALT_PADDING, SEEK_CUR) == -1) {
-    SLOGE("Cannot seek to real block device salt\n");
+  if (crypt_ftr->magic != CRYPT_MNT_MAGIC) {
+    printf("Bad magic for real block device %s\n", fname);
     goto errout;
   }
 
-  if ( (cnt = read(fd, salt, SALT_LEN)) != SALT_LEN) {
-    SLOGE("Cannot read salt for real block device %s\n", fname);
+  if (crypt_ftr->major_version != CURRENT_MAJOR_VERSION) {
+    printf("Cannot understand major version %d real block device footer; expected %d\n",
+          crypt_ftr->major_version, CURRENT_MAJOR_VERSION);
     goto errout;
   }
 
+  if (crypt_ftr->minor_version > CURRENT_MINOR_VERSION) {
+    printf("Warning: crypto footer minor version %d, expected <= %d, continuing...\n",
+          crypt_ftr->minor_version, CURRENT_MINOR_VERSION);
+  }
+
+  /* If this is a verion 1.0 crypt_ftr, make it a 1.1 crypt footer, and update the
+   * copy on disk before returning.
+   */
+  /*if (crypt_ftr->minor_version < CURRENT_MINOR_VERSION) {
+    upgrade_crypt_ftr(fd, crypt_ftr, starting_off);
+  }*/
+
   /* Success! */
   rc = 0;
 
@@ -352,6 +448,227 @@ errout:
   return rc;
 }
 
+static int validate_persistent_data_storage(struct crypt_mnt_ftr *crypt_ftr)
+{
+    if (crypt_ftr->persist_data_offset[0] + crypt_ftr->persist_data_size >
+        crypt_ftr->persist_data_offset[1]) {
+        printf("Crypt_ftr persist data regions overlap");
+        return -1;
+    }
+
+    if (crypt_ftr->persist_data_offset[0] >= crypt_ftr->persist_data_offset[1]) {
+        printf("Crypt_ftr persist data region 0 starts after region 1");
+        return -1;
+    }
+
+    if (((crypt_ftr->persist_data_offset[1] + crypt_ftr->persist_data_size) -
+        (crypt_ftr->persist_data_offset[0] - CRYPT_FOOTER_TO_PERSIST_OFFSET)) >
+        CRYPT_FOOTER_OFFSET) {
+        printf("Persistent data extends past crypto footer");
+        return -1;
+    }
+
+    return 0;
+}
+
+static int load_persistent_data(void)
+{
+    struct crypt_mnt_ftr crypt_ftr;
+    struct crypt_persist_data *pdata = NULL;
+    char encrypted_state[PROPERTY_VALUE_MAX];
+    char *fname;
+    int found = 0;
+    int fd;
+    int ret;
+    int i;
+
+    if (persist_data) {
+        /* Nothing to do, we've already loaded or initialized it */
+        return 0;
+    }
+
+
+    /* If not encrypted, just allocate an empty table and initialize it */
+    property_get("ro.crypto.state", encrypted_state, "");
+    if (strcmp(encrypted_state, "encrypted") ) {
+        pdata = malloc(CRYPT_PERSIST_DATA_SIZE);
+        if (pdata) {
+            init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE);
+            persist_data = pdata;
+            return 0;
+        }
+        return -1;
+    }
+
+    if(get_crypt_ftr_and_key(&crypt_ftr)) {
+        return -1;
+    }
+
+    if ((crypt_ftr.major_version != 1) || (crypt_ftr.minor_version != 1)) {
+        printf("Crypt_ftr version doesn't support persistent data");
+        return -1;
+    }
+
+    if (get_crypt_ftr_info(&fname, NULL)) {
+        return -1;
+    }
+
+    ret = validate_persistent_data_storage(&crypt_ftr);
+    if (ret) {
+        return -1;
+    }
+
+    fd = open(fname, O_RDONLY);
+    if (fd < 0) {
+        printf("Cannot open %s metadata file", fname);
+        return -1;
+    }
+
+    if (persist_data == NULL) {
+        pdata = malloc(crypt_ftr.persist_data_size);
+        if (pdata == NULL) {
+            printf("Cannot allocate memory for persistent data");
+            goto err;
+        }
+    }
+
+    for (i = 0; i < 2; i++) {
+        if (lseek64(fd, crypt_ftr.persist_data_offset[i], SEEK_SET) < 0) {
+            printf("Cannot seek to read persistent data on %s", fname);
+            goto err2;
+        }
+        if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0){
+            printf("Error reading persistent data on iteration %d", i);
+            goto err2;
+        }
+        if (pdata->persist_magic == PERSIST_DATA_MAGIC) {
+            found = 1;
+            break;
+        }
+    }
+
+    if (!found) {
+        printf("Could not find valid persistent data, creating");
+        init_empty_persist_data(pdata, crypt_ftr.persist_data_size);
+    }
+
+    /* Success */
+    persist_data = pdata;
+    close(fd);
+    return 0;
+
+err2:
+    free(pdata);
+
+err:
+    close(fd);
+    return -1;
+}
+
+static int save_persistent_data(void)
+{
+    struct crypt_mnt_ftr crypt_ftr;
+    struct crypt_persist_data *pdata;
+    char *fname;
+    off64_t write_offset;
+    off64_t erase_offset;
+    int found = 0;
+    int fd;
+    int ret;
+
+    if (persist_data == NULL) {
+        printf("No persistent data to save");
+        return -1;
+    }
+
+    if(get_crypt_ftr_and_key(&crypt_ftr)) {
+        return -1;
+    }
+
+    if ((crypt_ftr.major_version != 1) || (crypt_ftr.minor_version != 1)) {
+        printf("Crypt_ftr version doesn't support persistent data");
+        return -1;
+    }
+
+    ret = validate_persistent_data_storage(&crypt_ftr);
+    if (ret) {
+        return -1;
+    }
+
+    if (get_crypt_ftr_info(&fname, NULL)) {
+        return -1;
+    }
+
+    fd = open(fname, O_RDWR);
+    if (fd < 0) {
+        printf("Cannot open %s metadata file", fname);
+        return -1;
+    }
+
+    pdata = malloc(crypt_ftr.persist_data_size);
+    if (pdata == NULL) {
+        printf("Cannot allocate persistant data");
+        goto err;
+    }
+
+    if (lseek64(fd, crypt_ftr.persist_data_offset[0], SEEK_SET) < 0) {
+        printf("Cannot seek to read persistent data on %s", fname);
+        goto err2;
+    }
+
+    if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0) {
+            printf("Error reading persistent data before save");
+            goto err2;
+    }
+
+    if (pdata->persist_magic == PERSIST_DATA_MAGIC) {
+        /* The first copy is the curent valid copy, so write to
+         * the second copy and erase this one */
+       write_offset = crypt_ftr.persist_data_offset[1];
+       erase_offset = crypt_ftr.persist_data_offset[0];
+    } else {
+        /* The second copy must be the valid copy, so write to
+         * the first copy, and erase the second */
+       write_offset = crypt_ftr.persist_data_offset[0];
+       erase_offset = crypt_ftr.persist_data_offset[1];
+    }
+
+    /* Write the new copy first, if successful, then erase the old copy */
+    if (lseek(fd, write_offset, SEEK_SET) < 0) {
+        printf("Cannot seek to write persistent data");
+        goto err2;
+    }
+    if (unix_write(fd, persist_data, crypt_ftr.persist_data_size) ==
+        (int) crypt_ftr.persist_data_size) {
+        if (lseek(fd, erase_offset, SEEK_SET) < 0) {
+            printf("Cannot seek to erase previous persistent data");
+            goto err2;
+        }
+        fsync(fd);
+        memset(pdata, 0, crypt_ftr.persist_data_size);
+        if (unix_write(fd, pdata, crypt_ftr.persist_data_size) !=
+            (int) crypt_ftr.persist_data_size) {
+            printf("Cannot write to erase previous persistent data");
+            goto err2;
+        }
+        fsync(fd);
+    } else {
+        printf("Cannot write to save persistent data");
+        goto err2;
+    }
+
+    /* Success */
+    free(pdata);
+    close(fd);
+    return 0;
+
+err2:
+    free(pdata);
+err:
+    close(fd);
+    return -1;
+}
+
 /* Convert a binary key of specified length into an ascii hex string equivalent,
  * without the leading 0x and with null termination
  */
@@ -375,6 +692,86 @@ void convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize,
 
 }
 
+static int load_crypto_mapping_table(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key,
+                                     char *real_blk_name, const char *name, int fd,
+                                     char *extra_params)
+{
+  char buffer[DM_CRYPT_BUF_SIZE];
+  struct dm_ioctl *io;
+  struct dm_target_spec *tgt;
+  char *crypt_params;
+  char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */
+  int i;
+
+  io = (struct dm_ioctl *) buffer;
+
+  /* Load the mapping table for this device */
+  tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)];
+
+  ioctl_init(io, DM_CRYPT_BUF_SIZE, 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 %s", crypt_ftr->crypto_type_name,
+          master_key_ascii, real_blk_name, extra_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;
+
+  for (i = 0; i < TABLE_LOAD_RETRIES; i++) {
+    if (! ioctl(fd, DM_TABLE_LOAD, io)) {
+      break;
+    }
+    usleep(500000);
+  }
+
+  if (i == TABLE_LOAD_RETRIES) {
+    /* We failed to load the table, return an error */
+    return -1;
+  } else {
+    return i + 1;
+  }
+}
+
+
+static int get_dm_crypt_version(int fd, const char *name,  int *version)
+{
+    char buffer[DM_CRYPT_BUF_SIZE];
+    struct dm_ioctl *io;
+    struct dm_target_versions *v;
+    int i;
+
+    io = (struct dm_ioctl *) buffer;
+
+    ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0);
+
+    if (ioctl(fd, DM_LIST_VERSIONS, io)) {
+        return -1;
+    }
+
+    /* Iterate over the returned versions, looking for name of "crypt".
+     * When found, get and return the version.
+     */
+    v = (struct dm_target_versions *) &buffer[sizeof(struct dm_ioctl)];
+    while (v->next) {
+        if (! strcmp(v->name, "crypt")) {
+            /* We found the crypt driver, return the version, and get out */
+            version[0] = v->version[0];
+            version[1] = v->version[1];
+            version[2] = v->version[2];
+            return 0;
+        }
+        v = (struct dm_target_versions *)(((char *)v) + v->next);
+    }
+
+    return -1;
+}
+
 static int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key,
                                     char *real_blk_name, char *crypto_blk_name, const char *name)
 {
@@ -385,10 +782,14 @@ static int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char
   struct dm_target_spec *tgt;
   unsigned int minor;
   int fd;
+  int i;
   int retval = -1;
+  int version[3];
+  char *extra_params;
+  int load_count;
 
   if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) {
-    SLOGE("Cannot open device-mapper\n");
+    printf("Cannot open device-mapper\n");
     goto errout;
   }
 
@@ -396,47 +797,43 @@ static int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char
 
   ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0);
   if (ioctl(fd, DM_DEV_CREATE, io)) {
-    SLOGE("Cannot create dm-crypt device\n");
+    printf("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");
+    printf("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);
-  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;
+  extra_params = "";
+  if (! get_dm_crypt_version(fd, name, version)) {
+      /* Support for allow_discards was added in version 1.11.0 */
+      if ((version[0] >= 2) ||
+          ((version[0] == 1) && (version[1] >= 11))) {
+          extra_params = "1 allow_discards";
+          printf("Enabling support for allow_discards in dmcrypt.\n");
+      }
+  }
 
-  if (ioctl(fd, DM_TABLE_LOAD, io)) {
-      SLOGE("Cannot load dm-crypt mapping table.\n");
+  load_count = load_crypto_mapping_table(crypt_ftr, master_key, real_blk_name, name,
+                                         fd, extra_params);
+  if (load_count < 0) {
+      printf("Cannot load dm-crypt mapping table.\n");
       goto errout;
+  } else if (load_count > 1) {
+      printf("Took %d tries to load dmcrypt table.\n", load_count);
   }
 
   /* Resume this device to activate it */
-  ioctl_init(io, 4096, name, 0);
+  ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0);
 
   if (ioctl(fd, DM_DEV_SUSPEND, io)) {
-    SLOGE("Cannot resume the dm-crypt device\n");
+    printf("Cannot resume the dm-crypt device\n");
     goto errout;
   }
 
@@ -457,7 +854,7 @@ static int delete_crypto_blk_dev(char *name)
   int retval = -1;
 
   if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) {
-    SLOGE("Cannot open device-mapper\n");
+    printf("Cannot open device-mapper\n");
     goto errout;
   }
 
@@ -465,7 +862,7 @@ static int delete_crypto_blk_dev(char *name)
 
   ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0);
   if (ioctl(fd, DM_DEV_REMOVE, io)) {
-    SLOGE("Cannot remove dm-crypt device\n");
+    printf("Cannot remove dm-crypt device\n");
     goto errout;
   }
 
@@ -479,27 +876,40 @@ errout:
 
 }
 
-static void pbkdf2(char *passwd, unsigned char *salt, unsigned char *ikey)
-{
+static void pbkdf2(char *passwd, unsigned char *salt, unsigned char *ikey, void *params) {
     /* Turn the password into a key and IV that can decrypt the master key */
     PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), salt, SALT_LEN,
                            HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey);
 }
 
+static void scrypt(char *passwd, unsigned char *salt, unsigned char *ikey, void *params) {
+    struct crypt_mnt_ftr *ftr = (struct crypt_mnt_ftr *) params;
+
+    int N = 1 << ftr->N_factor;
+    int r = 1 << ftr->r_factor;
+    int p = 1 << ftr->p_factor;
+
+    /* Turn the password into a key and IV that can decrypt the master key */
+    crypto_scrypt((unsigned char *) passwd, strlen(passwd), salt, SALT_LEN, N, r, p, ikey,
+            KEY_LEN_BYTES + IV_LEN_BYTES);
+}
+
 static int encrypt_master_key(char *passwd, unsigned char *salt,
                               unsigned char *decrypted_master_key,
-                              unsigned char *encrypted_master_key)
+                              unsigned char *encrypted_master_key,
+                              struct crypt_mnt_ftr *crypt_ftr)
 {
     unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */
     EVP_CIPHER_CTX e_ctx;
     int encrypted_len, final_len;
 
     /* Turn the password into a key and IV that can decrypt the master key */
-    pbkdf2(passwd, salt, ikey);
-  
+    get_device_scrypt_params(crypt_ftr);
+    scrypt(passwd, salt, ikey, crypt_ftr);
+
     /* Initialize the decryption engine */
     if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) {
-        SLOGE("EVP_EncryptInit failed\n");
+        printf("EVP_EncryptInit failed\n");
         return -1;
     }
     EVP_CIPHER_CTX_set_padding(&e_ctx, 0); /* Turn off padding as our data is block aligned */
@@ -507,16 +917,16 @@ static int encrypt_master_key(char *passwd, unsigned char *salt,
     /* Encrypt the master key */
     if (! EVP_EncryptUpdate(&e_ctx, encrypted_master_key, &encrypted_len,
                               decrypted_master_key, KEY_LEN_BYTES)) {
-        SLOGE("EVP_EncryptUpdate failed\n");
+        printf("EVP_EncryptUpdate failed\n");
         return -1;
     }
     if (! EVP_EncryptFinal(&e_ctx, encrypted_master_key + encrypted_len, &final_len)) {
-        SLOGE("EVP_EncryptFinal failed\n");
+        printf("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);
+        printf("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len);
         return -1;
     } else {
         return 0;
@@ -525,14 +935,15 @@ static int encrypt_master_key(char *passwd, unsigned char *salt,
 
 static int decrypt_master_key(char *passwd, unsigned char *salt,
                               unsigned char *encrypted_master_key,
-                              unsigned char *decrypted_master_key)
+                              unsigned char *decrypted_master_key,
+                              kdf_func kdf, void *kdf_params)
 {
   unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */
   EVP_CIPHER_CTX d_ctx;
   int decrypted_len, final_len;
 
   /* Turn the password into a key and IV that can decrypt the master key */
-  pbkdf2(passwd, salt, ikey);
+  kdf(passwd, salt, ikey, kdf_params);
 
   /* Initialize the decryption engine */
   if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) {
@@ -555,8 +966,47 @@ static int decrypt_master_key(char *passwd, unsigned char *salt,
   }
 }
 
-static int create_encrypted_random_key(char *passwd, unsigned char *master_key, unsigned char *salt)
+static void get_kdf_func(struct crypt_mnt_ftr *ftr, kdf_func *kdf, void** kdf_params)
+{
+    if (ftr->kdf_type == KDF_SCRYPT) {
+        *kdf = scrypt;
+        *kdf_params = ftr;
+    } else {
+        *kdf = pbkdf2;
+        *kdf_params = NULL;
+    }
+}
+
+static int decrypt_master_key_and_upgrade(char *passwd, unsigned char *decrypted_master_key,
+        struct crypt_mnt_ftr *crypt_ftr)
 {
+    kdf_func kdf;
+    void *kdf_params;
+    int ret;
+
+    get_kdf_func(crypt_ftr, &kdf, &kdf_params);
+    ret = decrypt_master_key(passwd, crypt_ftr->salt, crypt_ftr->master_key, decrypted_master_key, kdf,
+            kdf_params);
+    if (ret != 0) {
+        printf("failure decrypting master key");
+        return ret;
+    }
+
+    /*
+     * Upgrade if we're not using the latest KDF.
+     */
+    /*if (crypt_ftr->kdf_type != KDF_SCRYPT) {
+        crypt_ftr->kdf_type = KDF_SCRYPT;
+        encrypt_master_key(passwd, crypt_ftr->salt, decrypted_master_key, crypt_ftr->master_key,
+                crypt_ftr);
+        put_crypt_ftr_and_key(crypt_ftr);
+    }*/
+
+    return ret;
+}
+
+static int create_encrypted_random_key(char *passwd, unsigned char *master_key, unsigned char *salt,
+        struct crypt_mnt_ftr *crypt_ftr) {
     int fd;
     unsigned char key_buf[KEY_LEN_BYTES];
     EVP_CIPHER_CTX e_ctx;
@@ -569,7 +1019,7 @@ static int create_encrypted_random_key(char *passwd, unsigned char *master_key,
     close(fd);
 
     /* Now encrypt it with the password */
-    return encrypt_master_key(passwd, salt, key_buf, master_key);
+    return encrypt_master_key(passwd, salt, key_buf, master_key, crypt_ftr);
 }
 
 static int wait_and_unmount(char *mountpoint)
@@ -594,17 +1044,17 @@ static int wait_and_unmount(char *mountpoint)
     }
 
     if (i < WAIT_UNMOUNT_COUNT) {
-      SLOGD("unmounting %s succeeded\n", mountpoint);
+      printf("unmounting %s succeeded\n", mountpoint);
       rc = 0;
     } else {
-      SLOGE("unmounting %s failed\n", mountpoint);
+      printf("unmounting %s failed\n", mountpoint);
       rc = -1;
     }
 
     return rc;
 }
 
-#define DATA_PREP_TIMEOUT 100
+#define DATA_PREP_TIMEOUT 200
 static int prep_data_fs(void)
 {
     int i;
@@ -612,9 +1062,9 @@ static int prep_data_fs(void)
     /* 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");
+    printf("Just triggered post_fs_data\n");
 
-    /* Wait a max of 25 seconds, hopefully it takes much less */
+    /* Wait a max of 50 seconds, hopefully it takes much less */
     for (i=0; i<DATA_PREP_TIMEOUT; i++) {
         char p[PROPERTY_VALUE_MAX];
 
@@ -627,9 +1077,10 @@ static int prep_data_fs(void)
     }
     if (i == DATA_PREP_TIMEOUT) {
         /* Ugh, we failed to prep /data in time.  Bail. */
+        printf("post_fs_data timed out!\n");
         return -1;
     } else {
-        SLOGD("post_fs_data done\n");
+        printf("post_fs_data done\n");
         return 0;
     }
 }
@@ -647,12 +1098,12 @@ int cryptfs_restart(void)
 
     /* Validate that it's OK to call this routine */
     if (! master_key_saved) {
-        SLOGE("Encrypted filesystem not validated, aborting");
+        printf("Encrypted filesystem not validated, aborting");
         return -1;
     }
 
     if (restart_successful) {
-        SLOGE("System already restarted with encrypted disk, aborting");
+        printf("System already restarted with encrypted disk, aborting");
         return -1;
     }
 
@@ -674,7 +1125,14 @@ int cryptfs_restart(void)
      * set to trigger_reset_main.
      */
     property_set("vold.decrypt", "trigger_reset_main");
-    SLOGD("Just asked init to shut down class main\n");
+    printf("Just asked init to shut down class main\n");
+
+    /* Ugh, shutting down the framework is not synchronous, so until it
+     * can be fixed, this horrible hack will wait a moment for it all to
+     * shut down before proceeding.  Without it, some devices cannot
+     * restart the graphics services.
+     */
+    sleep(2);
 
     /* Now that the framework is shutdown, we should be able to umount()
      * the tmpfs filesystem, and mount the real one.
@@ -682,13 +1140,13 @@ int cryptfs_restart(void)
 
     property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, "");
     if (strlen(crypto_blkdev) == 0) {
-        SLOGE("fs_crypto_blkdev not set\n");
+        printf("fs_crypto_blkdev not set\n");
         return -1;
     }
 
     if (! (rc = wait_and_unmount(DATA_MNT_POINT)) ) {
         /* If that succeeded, then mount the decrypted filesystem */
-        fs_mgr_do_mount(get_fstab_filename(), DATA_MNT_POINT, crypto_blkdev, 0);
+        fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, 0);
 
         property_set("vold.decrypt", "trigger_load_persist_props");
         /* Create necessary paths on /data */
@@ -698,7 +1156,7 @@ int cryptfs_restart(void)
 
         /* startup service classes main and late_start */
         property_set("vold.decrypt", "trigger_restart_framework");
-        SLOGD("Just triggered restart_framework\n");
+        printf("Just triggered restart_framework\n");
 
         /* Give it a few moments to get started */
         sleep(1);
@@ -714,22 +1172,17 @@ int cryptfs_restart(void)
 static int do_crypto_complete(char *mount_point)
 {
   struct crypt_mnt_ftr crypt_ftr;
-  unsigned char encrypted_master_key[32];
-  unsigned char salt[SALT_LEN];
-  char real_blkdev[MAXPATHLEN];
   char encrypted_state[PROPERTY_VALUE_MAX];
   char key_loc[PROPERTY_VALUE_MAX];
 
   property_get("ro.crypto.state", encrypted_state, "");
   if (strcmp(encrypted_state, "encrypted") ) {
-    SLOGE("not running with encryption, aborting");
+    printf("not running with encryption, aborting");
     return 1;
   }
 
-  fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev));
-
-  if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
-    fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc));
+  if (get_crypt_ftr_and_key(&crypt_ftr)) {
+    fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc));
 
     /*
      * Only report this error if key_loc is a file and it exists.
@@ -739,16 +1192,16 @@ static int do_crypto_complete(char *mount_point)
      * device" screen.
      */
     if ((key_loc[0] == '/') && (access("key_loc", F_OK) == -1)) {
-      SLOGE("master key file does not exist, aborting");
+      printf("master key file does not exist, aborting");
       return 1;
     } else {
-      SLOGE("Error getting crypt footer and key\n");
+      printf("Error getting crypt footer and key\n");
       return -1;
     }
   }
 
   if (crypt_ftr.flags & CRYPT_ENCRYPTION_IN_PROGRESS) {
-    SLOGE("Encryption process didn't finish successfully\n");
+    printf("Encryption process didn't finish successfully\n");
     return -2;  /* -2 is the clue to the UI that there is no usable data on the disk,
                  * and give the user an option to wipe the disk */
   }
@@ -761,42 +1214,43 @@ static int test_mount_encrypted_fs(char *passwd, char *mount_point, char *label)
 {
   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];
-  unsigned char salt[SALT_LEN];
+  unsigned char decrypted_master_key[32];
   char crypto_blkdev[MAXPATHLEN];
   char real_blkdev[MAXPATHLEN];
   char tmp_mount_point[64];
   unsigned int orig_failed_decrypt_count;
   char encrypted_state[PROPERTY_VALUE_MAX];
   int rc;
+  kdf_func kdf;
+  void *kdf_params;
 
   property_get("ro.crypto.state", encrypted_state, "");
   if ( master_key_saved || strcmp(encrypted_state, "encrypted") ) {
-    SLOGE("encrypted fs already validated or not running with encryption, aborting");
+    printf("encrypted fs already validated or not running with encryption, aborting");
     return -1;
   }
 
-  fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev));
+  fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
 
-  if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
-    SLOGE("Error getting crypt footer and key\n");
+  if (get_crypt_ftr_and_key(&crypt_ftr)) {
+    printf("Error getting crypt footer and key\n");
     return -1;
   }
 
-  SLOGD("crypt_ftr->fs_size = %lld\n", crypt_ftr.fs_size);
+  printf("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, salt, encrypted_master_key, decrypted_master_key);
+    decrypt_master_key_and_upgrade(passwd, decrypted_master_key, &crypt_ftr);
   }
 
   if (create_crypto_blk_dev(&crypt_ftr, decrypted_master_key,
                                real_blkdev, crypto_blkdev, label)) {
-    SLOGE("Error creating decrypted block device\n");
+    printf("Error creating decrypted block device\n");
     return -1;
   }
 
-  /* If init detects an encrypted filesystme, it writes a file for each such
+  /* If init detects an encrypted filesystem, 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
@@ -805,8 +1259,8 @@ static int test_mount_encrypted_fs(char *passwd, char *mount_point, char *label)
    */
   sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point);
   mkdir(tmp_mount_point, 0755);
-  if (fs_mgr_do_mount(get_fstab_filename(), DATA_MNT_POINT, crypto_blkdev, tmp_mount_point)) {
-    SLOGE("Error temp mounting decrypted block device\n");
+  if (fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, tmp_mount_point)) {
+    printf("Error temp mounting decrypted block device\n");
     delete_crypto_blk_dev(label);
     crypt_ftr.failed_decrypt_count++;
   } else {
@@ -818,7 +1272,7 @@ static int test_mount_encrypted_fs(char *passwd, char *mount_point, char *label)
   }
 
   if (orig_failed_decrypt_count != crypt_ftr.failed_decrypt_count) {
-    put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, 0, 0);
+    put_crypt_ftr_and_key(&crypt_ftr);
   }
 
   if (crypt_ftr.failed_decrypt_count) {
@@ -835,7 +1289,6 @@ static int test_mount_encrypted_fs(char *passwd, char *mount_point, char *label)
      * the key when we want to change the password on it.
      */
     memcpy(saved_master_key, decrypted_master_key, KEY_LEN_BYTES);
-    saved_data_blkdev = strdup(real_blkdev);
     saved_mount_point = strdup(mount_point);
     master_key_saved = 1;
     rc = 0;
@@ -864,21 +1317,19 @@ int cryptfs_setup_volume(const char *label, int major, int minor,
 {
     char real_blkdev[MAXPATHLEN], crypto_blkdev[MAXPATHLEN];
     struct crypt_mnt_ftr sd_crypt_ftr;
-    unsigned char key[32], salt[32];
     struct stat statbuf;
     int nr_sec, fd;
 
     sprintf(real_blkdev, "/dev/block/vold/%d:%d", major, minor);
 
-    /* Just want the footer, but gotta get it all */
-    get_crypt_ftr_and_key(saved_data_blkdev, &sd_crypt_ftr, key, salt);
+    get_crypt_ftr_and_key(&sd_crypt_ftr);
 
     /* Update the fs_size field to be the size of the volume */
     fd = open(real_blkdev, O_RDONLY);
     nr_sec = get_blkdev_size(fd);
     close(fd);
     if (nr_sec == 0) {
-        SLOGE("Cannot get size of volume %s\n", real_blkdev);
+        printf("Cannot get size of volume %s\n", real_blkdev);
         return -1;
     }
 
@@ -901,9 +1352,24 @@ int cryptfs_crypto_complete(void)
   return do_crypto_complete("/data");
 }
 
+#define FSTAB_PREFIX "/fstab."
+
 int cryptfs_check_passwd(char *passwd)
 {
     int rc = -1;
+    char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)];
+    char propbuf[PROPERTY_VALUE_MAX];
+    int i;
+    int flags;
+
+    property_get("ro.hardware", propbuf, "");
+    snprintf(fstab_filename, sizeof(fstab_filename), FSTAB_PREFIX"%s", propbuf);
+
+    fstab = fs_mgr_read_fstab(fstab_filename);
+    if (!fstab) {
+        printf("failed to open %s\n", fstab_filename);
+        return -1;
+    }
 
     rc = test_mount_encrypted_fs(passwd, DATA_MNT_POINT, "userdata");
 
@@ -914,32 +1380,28 @@ int cryptfs_verify_passwd(char *passwd)
 {
     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];
-    unsigned char salt[SALT_LEN];
-    char real_blkdev[MAXPATHLEN];
+    unsigned char decrypted_master_key[32];
     char encrypted_state[PROPERTY_VALUE_MAX];
     int rc;
 
     property_get("ro.crypto.state", encrypted_state, "");
     if (strcmp(encrypted_state, "encrypted") ) {
-        SLOGE("device not encrypted, aborting");
+        printf("device not encrypted, aborting");
         return -2;
     }
 
     if (!master_key_saved) {
-        SLOGE("encrypted fs not yet mounted, aborting");
+        printf("encrypted fs not yet mounted, aborting");
         return -1;
     }
 
     if (!saved_mount_point) {
-        SLOGE("encrypted fs failed to save mount point, aborting");
+        printf("encrypted fs failed to save mount point, aborting");
         return -1;
     }
 
-    fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev));
-
-    if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
-        SLOGE("Error getting crypt footer and key\n");
+    if (get_crypt_ftr_and_key(&crypt_ftr)) {
+        printf("Error getting crypt footer and key\n");
         return -1;
     }
 
@@ -947,7 +1409,7 @@ int cryptfs_verify_passwd(char *passwd)
         /* If the device has no password, then just say the password is valid */
         rc = 0;
     } else {
-        decrypt_master_key(passwd, salt, encrypted_master_key, decrypted_master_key);
+        decrypt_master_key_and_upgrade(passwd, decrypted_master_key, &crypt_ftr);
         if (!memcmp(decrypted_master_key, saved_master_key, crypt_ftr.keysize)) {
             /* They match, the password is correct */
             rc = 0;
@@ -968,58 +1430,29 @@ int cryptfs_verify_passwd(char *passwd)
  */
 static void cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr)
 {
+    off64_t off;
+
+    memset(ftr, 0, sizeof(struct crypt_mnt_ftr));
     ftr->magic = CRYPT_MNT_MAGIC;
-    ftr->major_version = 1;
-    ftr->minor_version = 0;
+    ftr->major_version = CURRENT_MAJOR_VERSION;
+    ftr->minor_version = CURRENT_MINOR_VERSION;
     ftr->ftr_size = sizeof(struct crypt_mnt_ftr);
-    ftr->flags = 0;
     ftr->keysize = KEY_LEN_BYTES;
-    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, int type)
-{
-    char cmdline[256];
-    int rc = -1;
+    ftr->kdf_type = KDF_SCRYPT;
+    get_device_scrypt_params(ftr);
 
-    if (type == EXT4_FS) {
-        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);
-    } else if (type== FAT_FS) {
-        snprintf(cmdline, sizeof(cmdline), "/system/bin/newfs_msdos -F 32 -O android -c 8 -s %lld %s",
-                 size, crypto_blkdev);
-        SLOGI("Making empty filesystem with command %s\n", cmdline);
-    } else {
-        SLOGE("cryptfs_enable_wipe(): unknown filesystem type %d\n", type);
-        return -1;
-    }
-
-    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;
+    ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE;
+    if (get_crypt_ftr_info(NULL, &off) == 0) {
+        ftr->persist_data_offset[0] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET;
+        ftr->persist_data_offset[1] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET +
+                                    ftr->persist_data_size;
     }
-
-    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)
+static int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size, int type)
 {
-    int  ret;
-    do { ret = write(fd, buff, len); } while (ret < 0 && errno == EINTR);
-    return ret;
+    return -1;
 }
 
 #define CRYPT_INPLACE_BUFSIZE 4096
@@ -1035,12 +1468,12 @@ static int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_
     off64_t blocks_already_done, tot_numblocks;
 
     if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { 
-        SLOGE("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev);
+        printf("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);
+        printf("Error opening crypto_blkdev %s for inplace encrypt\n", crypto_blkdev);
         close(realfd);
         return -1;
     }
@@ -1055,7 +1488,7 @@ static int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_
     tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE;
     blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE;
 
-    SLOGE("Encrypting filesystem in place...");
+    printf("Encrypting filesystem in place...");
 
     one_pct = tot_numblocks / 100;
     cur_pct = 0;
@@ -1070,11 +1503,11 @@ static int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_
             property_set("vold.encrypt_progress", buf);
         }
         if (unix_read(realfd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) {
-            SLOGE("Error reading real_blkdev %s for inplace encrypt\n", crypto_blkdev);
+            printf("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);
+            printf("Error writing crypto_blkdev %s for inplace encrypt\n", crypto_blkdev);
             goto errout;
         }
     }
@@ -1082,11 +1515,11 @@ static int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_
     /* 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);
+            printf("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);
+            printf("Error writing final sectors to crypto_blkdev %s for inplace encrypt\n", crypto_blkdev);
             goto errout;
         }
     }
@@ -1114,39 +1547,170 @@ static inline int should_encrypt(struct volume_info *volume)
 
 int cryptfs_enable(char *howarg, char *passwd)
 {
-    // Code removed because it needs other parts of vold that aren't needed for decryption
     return -1;
 }
 
 int cryptfs_changepw(char *newpw)
 {
     struct crypt_mnt_ftr crypt_ftr;
-    unsigned char encrypted_master_key[KEY_LEN_BYTES], decrypted_master_key[KEY_LEN_BYTES];
-    unsigned char salt[SALT_LEN];
-    char real_blkdev[MAXPATHLEN];
+    unsigned char decrypted_master_key[KEY_LEN_BYTES];
 
     /* This is only allowed after we've successfully decrypted the master key */
     if (! master_key_saved) {
-        SLOGE("Key not saved, aborting");
-        return -1;
-    }
-
-    fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev));
-    if (strlen(real_blkdev) == 0) {
-        SLOGE("Can't find real blkdev");
+        printf("Key not saved, aborting");
         return -1;
     }
 
     /* get key */
-    if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
-      SLOGE("Error getting crypt footer and key");
+    if (get_crypt_ftr_and_key(&crypt_ftr)) {
+      printf("Error getting crypt footer and key");
       return -1;
     }
 
-    encrypt_master_key(newpw, salt, saved_master_key, encrypted_master_key);
+    encrypt_master_key(newpw, crypt_ftr.salt, saved_master_key, crypt_ftr.master_key, &crypt_ftr);
 
     /* save the key */
-    put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt);
+    put_crypt_ftr_and_key(&crypt_ftr);
 
     return 0;
 }
+
+static int persist_get_key(char *fieldname, char *value)
+{
+    unsigned int i;
+
+    if (persist_data == NULL) {
+        return -1;
+    }
+    for (i = 0; i < persist_data->persist_valid_entries; i++) {
+        if (!strncmp(persist_data->persist_entry[i].key, fieldname, PROPERTY_KEY_MAX)) {
+            /* We found it! */
+            strlcpy(value, persist_data->persist_entry[i].val, PROPERTY_VALUE_MAX);
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+static int persist_set_key(char *fieldname, char *value, int encrypted)
+{
+    unsigned int i;
+    unsigned int num;
+    struct crypt_mnt_ftr crypt_ftr;
+    unsigned int max_persistent_entries;
+    unsigned int dsize;
+
+    if (persist_data == NULL) {
+        return -1;
+    }
+
+    /* If encrypted, use the values from the crypt_ftr, otherwise
+     * use the values for the current spec.
+     */
+    if (encrypted) {
+        if(get_crypt_ftr_and_key(&crypt_ftr)) {
+            return -1;
+        }
+        dsize = crypt_ftr.persist_data_size;
+    } else {
+        dsize = CRYPT_PERSIST_DATA_SIZE;
+    }
+    max_persistent_entries = (dsize - sizeof(struct crypt_persist_data)) /
+                             sizeof(struct crypt_persist_entry);
+
+    num = persist_data->persist_valid_entries;
+
+    for (i = 0; i < num; i++) {
+        if (!strncmp(persist_data->persist_entry[i].key, fieldname, PROPERTY_KEY_MAX)) {
+            /* We found an existing entry, update it! */
+            memset(persist_data->persist_entry[i].val, 0, PROPERTY_VALUE_MAX);
+            strlcpy(persist_data->persist_entry[i].val, value, PROPERTY_VALUE_MAX);
+            return 0;
+        }
+    }
+
+    /* We didn't find it, add it to the end, if there is room */
+    if (persist_data->persist_valid_entries < max_persistent_entries) {
+        memset(&persist_data->persist_entry[num], 0, sizeof(struct crypt_persist_entry));
+        strlcpy(persist_data->persist_entry[num].key, fieldname, PROPERTY_KEY_MAX);
+        strlcpy(persist_data->persist_entry[num].val, value, PROPERTY_VALUE_MAX);
+        persist_data->persist_valid_entries++;
+        return 0;
+    }
+
+    return -1;
+}
+
+/* Return the value of the specified field. */
+int cryptfs_getfield(char *fieldname, char *value, int len)
+{
+    char temp_value[PROPERTY_VALUE_MAX];
+    char real_blkdev[MAXPATHLEN];
+    /* 0 is success, 1 is not encrypted,
+     * -1 is value not set, -2 is any other error
+     */
+    int rc = -2;
+
+    if (persist_data == NULL) {
+        load_persistent_data();
+        if (persist_data == NULL) {
+            printf("Getfield error, cannot load persistent data");
+            goto out;
+        }
+    }
+
+    if (!persist_get_key(fieldname, temp_value)) {
+        /* We found it, copy it to the caller's buffer and return */
+        strlcpy(value, temp_value, len);
+        rc = 0;
+    } else {
+        /* Sadness, it's not there.  Return the error */
+        rc = -1;
+    }
+
+out:
+    return rc;
+}
+
+/* Set the value of the specified field. */
+int cryptfs_setfield(char *fieldname, char *value)
+{
+    struct crypt_persist_data stored_pdata;
+    struct crypt_persist_data *pdata_p;
+    struct crypt_mnt_ftr crypt_ftr;
+    char encrypted_state[PROPERTY_VALUE_MAX];
+    /* 0 is success, -1 is an error */
+    int rc = -1;
+    int encrypted = 0;
+
+    if (persist_data == NULL) {
+        load_persistent_data();
+        if (persist_data == NULL) {
+            printf("Setfield error, cannot load persistent data");
+            goto out;
+        }
+    }
+
+    property_get("ro.crypto.state", encrypted_state, "");
+    if (!strcmp(encrypted_state, "encrypted") ) {
+        encrypted = 1;
+    }
+
+    if (persist_set_key(fieldname, value, encrypted)) {
+        goto out;
+    }
+
+    /* If we are running encrypted, save the persistent data now */
+    if (encrypted) {
+        if (save_persistent_data()) {
+            printf("Setfield error, cannot save persistent data");
+            goto out;
+        }
+    }
+
+    rc = 0;
+
+out:
+    return rc;
+}