diff --git a/ap/lib/libkey/crc32.c b/ap/lib/libkey/crc32.c
new file mode 100644
index 0000000..a1d00f4
--- /dev/null
+++ b/ap/lib/libkey/crc32.c
@@ -0,0 +1,254 @@
+/*
+ * This file is derived from crc32.c from the zlib-1.1.3 distribution
+ * by Jean-loup Gailly and Mark Adler.
+ */
+
+/* crc32.c -- compute the CRC-32 of a data stream
+ * Copyright (C) 1995-1998 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+
+
+#include "crc32.h"
+
+
+
+//#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+//#include <watchdog.h>
+//#endif
+
+
+#define local static
+#define ZEXPORT	/* empty */
+
+#define cpu_to_le32(x)  (x)
+#define tole(x) cpu_to_le32(x)
+#define le32_to_cpu(x)	(x)
+
+
+#ifdef DYNAMIC_CRC_TABLE
+
+local int crc_table_empty = 1;
+local unsigned int crc_table[256];
+local void make_crc_table OF((void));
+
+/*
+  Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
+  x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.
+
+  Polynomials over GF(2) are represented in binary, one bit per coefficient,
+  with the lowest powers in the most significant bit.  Then adding polynomials
+  is just exclusive-or, and multiplying a polynomial by x is a right shift by
+  one.  If we call the above polynomial p, and represent a byte as the
+  polynomial q, also with the lowest power in the most significant bit (so the
+  byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
+  where a mod b means the remainder after dividing a by b.
+
+  This calculation is done using the shift-register method of multiplying and
+  taking the remainder.  The register is initialized to zero, and for each
+  incoming bit, x^32 is added mod p to the register if the bit is a one (where
+  x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
+  x (which is shifting right by one and adding x^32 mod p if the bit shifted
+  out is a one).  We start with the highest power (least significant bit) of
+  q and repeat for all eight bits of q.
+
+  The table is simply the CRC of all possible eight bit values.  This is all
+  the information needed to generate CRC's on data a byte at a time for all
+  combinations of CRC register values and incoming bytes.
+*/
+local void make_crc_table()
+{
+  unsigned int c;
+  int n, k;
+  uLong poly;		/* polynomial exclusive-or pattern */
+  /* terms of polynomial defining this crc (except x^32): */
+  static const Byte p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
+
+  /* make exclusive-or pattern from polynomial (0xedb88320L) */
+  poly = 0L;
+  for (n = 0; n < sizeof(p)/sizeof(Byte); n++)
+    poly |= 1L << (31 - p[n]);
+
+  for (n = 0; n < 256; n++)
+  {
+    c = (uLong)n;
+    for (k = 0; k < 8; k++)
+      c = c & 1 ? poly ^ (c >> 1) : c >> 1;
+    crc_table[n] = tole(c);
+  }
+  crc_table_empty = 0;
+}
+#else
+/* ========================================================================
+ * Table of CRC-32's of all single-byte values (made by make_crc_table)
+ */
+
+local const unsigned int crc_table[256] = {
+tole(0x00000000L), tole(0x77073096L), tole(0xee0e612cL), tole(0x990951baL),
+tole(0x076dc419L), tole(0x706af48fL), tole(0xe963a535L), tole(0x9e6495a3L),
+tole(0x0edb8832L), tole(0x79dcb8a4L), tole(0xe0d5e91eL), tole(0x97d2d988L),
+tole(0x09b64c2bL), tole(0x7eb17cbdL), tole(0xe7b82d07L), tole(0x90bf1d91L),
+tole(0x1db71064L), tole(0x6ab020f2L), tole(0xf3b97148L), tole(0x84be41deL),
+tole(0x1adad47dL), tole(0x6ddde4ebL), tole(0xf4d4b551L), tole(0x83d385c7L),
+tole(0x136c9856L), tole(0x646ba8c0L), tole(0xfd62f97aL), tole(0x8a65c9ecL),
+tole(0x14015c4fL), tole(0x63066cd9L), tole(0xfa0f3d63L), tole(0x8d080df5L),
+tole(0x3b6e20c8L), tole(0x4c69105eL), tole(0xd56041e4L), tole(0xa2677172L),
+tole(0x3c03e4d1L), tole(0x4b04d447L), tole(0xd20d85fdL), tole(0xa50ab56bL),
+tole(0x35b5a8faL), tole(0x42b2986cL), tole(0xdbbbc9d6L), tole(0xacbcf940L),
+tole(0x32d86ce3L), tole(0x45df5c75L), tole(0xdcd60dcfL), tole(0xabd13d59L),
+tole(0x26d930acL), tole(0x51de003aL), tole(0xc8d75180L), tole(0xbfd06116L),
+tole(0x21b4f4b5L), tole(0x56b3c423L), tole(0xcfba9599L), tole(0xb8bda50fL),
+tole(0x2802b89eL), tole(0x5f058808L), tole(0xc60cd9b2L), tole(0xb10be924L),
+tole(0x2f6f7c87L), tole(0x58684c11L), tole(0xc1611dabL), tole(0xb6662d3dL),
+tole(0x76dc4190L), tole(0x01db7106L), tole(0x98d220bcL), tole(0xefd5102aL),
+tole(0x71b18589L), tole(0x06b6b51fL), tole(0x9fbfe4a5L), tole(0xe8b8d433L),
+tole(0x7807c9a2L), tole(0x0f00f934L), tole(0x9609a88eL), tole(0xe10e9818L),
+tole(0x7f6a0dbbL), tole(0x086d3d2dL), tole(0x91646c97L), tole(0xe6635c01L),
+tole(0x6b6b51f4L), tole(0x1c6c6162L), tole(0x856530d8L), tole(0xf262004eL),
+tole(0x6c0695edL), tole(0x1b01a57bL), tole(0x8208f4c1L), tole(0xf50fc457L),
+tole(0x65b0d9c6L), tole(0x12b7e950L), tole(0x8bbeb8eaL), tole(0xfcb9887cL),
+tole(0x62dd1ddfL), tole(0x15da2d49L), tole(0x8cd37cf3L), tole(0xfbd44c65L),
+tole(0x4db26158L), tole(0x3ab551ceL), tole(0xa3bc0074L), tole(0xd4bb30e2L),
+tole(0x4adfa541L), tole(0x3dd895d7L), tole(0xa4d1c46dL), tole(0xd3d6f4fbL),
+tole(0x4369e96aL), tole(0x346ed9fcL), tole(0xad678846L), tole(0xda60b8d0L),
+tole(0x44042d73L), tole(0x33031de5L), tole(0xaa0a4c5fL), tole(0xdd0d7cc9L),
+tole(0x5005713cL), tole(0x270241aaL), tole(0xbe0b1010L), tole(0xc90c2086L),
+tole(0x5768b525L), tole(0x206f85b3L), tole(0xb966d409L), tole(0xce61e49fL),
+tole(0x5edef90eL), tole(0x29d9c998L), tole(0xb0d09822L), tole(0xc7d7a8b4L),
+tole(0x59b33d17L), tole(0x2eb40d81L), tole(0xb7bd5c3bL), tole(0xc0ba6cadL),
+tole(0xedb88320L), tole(0x9abfb3b6L), tole(0x03b6e20cL), tole(0x74b1d29aL),
+tole(0xead54739L), tole(0x9dd277afL), tole(0x04db2615L), tole(0x73dc1683L),
+tole(0xe3630b12L), tole(0x94643b84L), tole(0x0d6d6a3eL), tole(0x7a6a5aa8L),
+tole(0xe40ecf0bL), tole(0x9309ff9dL), tole(0x0a00ae27L), tole(0x7d079eb1L),
+tole(0xf00f9344L), tole(0x8708a3d2L), tole(0x1e01f268L), tole(0x6906c2feL),
+tole(0xf762575dL), tole(0x806567cbL), tole(0x196c3671L), tole(0x6e6b06e7L),
+tole(0xfed41b76L), tole(0x89d32be0L), tole(0x10da7a5aL), tole(0x67dd4accL),
+tole(0xf9b9df6fL), tole(0x8ebeeff9L), tole(0x17b7be43L), tole(0x60b08ed5L),
+tole(0xd6d6a3e8L), tole(0xa1d1937eL), tole(0x38d8c2c4L), tole(0x4fdff252L),
+tole(0xd1bb67f1L), tole(0xa6bc5767L), tole(0x3fb506ddL), tole(0x48b2364bL),
+tole(0xd80d2bdaL), tole(0xaf0a1b4cL), tole(0x36034af6L), tole(0x41047a60L),
+tole(0xdf60efc3L), tole(0xa867df55L), tole(0x316e8eefL), tole(0x4669be79L),
+tole(0xcb61b38cL), tole(0xbc66831aL), tole(0x256fd2a0L), tole(0x5268e236L),
+tole(0xcc0c7795L), tole(0xbb0b4703L), tole(0x220216b9L), tole(0x5505262fL),
+tole(0xc5ba3bbeL), tole(0xb2bd0b28L), tole(0x2bb45a92L), tole(0x5cb36a04L),
+tole(0xc2d7ffa7L), tole(0xb5d0cf31L), tole(0x2cd99e8bL), tole(0x5bdeae1dL),
+tole(0x9b64c2b0L), tole(0xec63f226L), tole(0x756aa39cL), tole(0x026d930aL),
+tole(0x9c0906a9L), tole(0xeb0e363fL), tole(0x72076785L), tole(0x05005713L),
+tole(0x95bf4a82L), tole(0xe2b87a14L), tole(0x7bb12baeL), tole(0x0cb61b38L),
+tole(0x92d28e9bL), tole(0xe5d5be0dL), tole(0x7cdcefb7L), tole(0x0bdbdf21L),
+tole(0x86d3d2d4L), tole(0xf1d4e242L), tole(0x68ddb3f8L), tole(0x1fda836eL),
+tole(0x81be16cdL), tole(0xf6b9265bL), tole(0x6fb077e1L), tole(0x18b74777L),
+tole(0x88085ae6L), tole(0xff0f6a70L), tole(0x66063bcaL), tole(0x11010b5cL),
+tole(0x8f659effL), tole(0xf862ae69L), tole(0x616bffd3L), tole(0x166ccf45L),
+tole(0xa00ae278L), tole(0xd70dd2eeL), tole(0x4e048354L), tole(0x3903b3c2L),
+tole(0xa7672661L), tole(0xd06016f7L), tole(0x4969474dL), tole(0x3e6e77dbL),
+tole(0xaed16a4aL), tole(0xd9d65adcL), tole(0x40df0b66L), tole(0x37d83bf0L),
+tole(0xa9bcae53L), tole(0xdebb9ec5L), tole(0x47b2cf7fL), tole(0x30b5ffe9L),
+tole(0xbdbdf21cL), tole(0xcabac28aL), tole(0x53b39330L), tole(0x24b4a3a6L),
+tole(0xbad03605L), tole(0xcdd70693L), tole(0x54de5729L), tole(0x23d967bfL),
+tole(0xb3667a2eL), tole(0xc4614ab8L), tole(0x5d681b02L), tole(0x2a6f2b94L),
+tole(0xb40bbe37L), tole(0xc30c8ea1L), tole(0x5a05df1bL), tole(0x2d02ef8dL)
+};
+#endif
+
+#if 0
+/* =========================================================================
+ * This function can be used by asm versions of crc32()
+ */
+const uint32_t * ZEXPORT get_crc_table()
+{
+#ifdef DYNAMIC_CRC_TABLE
+  if (crc_table_empty) make_crc_table();
+#endif
+  return (const uint32_t *)crc_table;
+}
+#endif
+
+/* ========================================================================= */
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+#  define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc >> 8)
+# else
+#  define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
+# endif
+
+/* ========================================================================= */
+
+/* No ones complement version. JFFS2 (and other things ?)
+ * don't use ones compliment in their CRC calculations.
+ */
+unsigned int ZEXPORT crc32_no_comp(unsigned int crc, const unsigned char *buf, unsigned int len)
+{
+    const unsigned int *tab = crc_table;
+    const unsigned int *b =(const unsigned int *)buf;
+    unsigned int rem_len;
+#ifdef DYNAMIC_CRC_TABLE
+    if (crc_table_empty)
+      make_crc_table();
+#endif
+    crc = cpu_to_le32(crc);
+    /* Align it */
+    if (((long)b) & 3 && len) {
+	 unsigned char *p = (unsigned char *)b;
+	 do {
+	      DO_CRC(*p++);
+	 } while ((--len) && ((long)p)&3);
+	 b = (unsigned int *)p;
+    }
+
+    rem_len = len & 3;
+    len = len >> 2;
+    for (--b; len; --len) {
+	 /* load data 32 bits wide, xor data 32 bits wide. */
+	 crc ^= *++b; /* use pre increment for speed */
+	 DO_CRC(0);
+	 DO_CRC(0);
+	 DO_CRC(0);
+	 DO_CRC(0);
+    }
+    len = rem_len;
+    /* And the last few bytes */
+    if (len) {
+	 unsigned char *p = (unsigned char *)(b + 1) - 1;
+	 do {
+	      DO_CRC(*++p); /* use pre increment for speed */
+	 } while (--len);
+    }
+
+    return le32_to_cpu(crc);
+}
+#undef DO_CRC
+
+unsigned int ZEXPORT crc32 (unsigned int crc, const unsigned char *p, unsigned int len)
+{
+     return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL;
+}
+
+/*
+ * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes
+ * of input.
+ */
+unsigned int ZEXPORT crc32_wd (unsigned int crc,
+			   const unsigned char *buf,
+			   unsigned int len, unsigned int chunk_sz)
+{
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	const unsigned char *end, *curr;
+	int chunk;
+
+	curr = buf;
+	end = buf + len;
+	while (curr < end) {
+		chunk = end - curr;
+		if (chunk > chunk_sz)
+			chunk = chunk_sz;
+		crc = crc32 (crc, curr, chunk);
+		curr += chunk;
+		//WATCHDOG_RESET ();
+	}
+#else
+	crc = crc32 (crc, buf, len);
+#endif
+
+	return crc;
+}