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    def hmac_sha1(self, addr, size, destination):
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    def hmac_sha1(self, addr, size, destination):
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        """ Generates a HMAC-SHA1 hash of the buffer and saves it to 'destination' """
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        """ Generates a HMAC-SHA1 hash of the buffer and saves it to 'destination' """
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        return self.lib.monitorcommand(struct.pack("IIII", 26, addr, size, destination), "III", (None, None, None))
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        return self.lib.monitorcommand(struct.pack("IIII", 26, addr, size, destination), "III", (None, None, None))
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    def ipodnano2g_getnandinfo(self):
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        """ Target-specific function: ipodnano2g
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            Gathers some information about the NAND chip used
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        """
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        return self.lib.monitorcommand(struct.pack("IIII", 0xffff0001, 0, 0, 0), "IHHHH", ("type", "pagesperblock", "banks", "userblocks", "blocks"))
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    def ipodnano2g_nandread(self, addr, start, count, doecc, checkempty):
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        """ Target-specific function: ipodnano2g
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            Reads data from the NAND chip into memory
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        """
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        return self.lib.monitorcommand(struct.pack("IIII", 0xffff0002, addr | (0x80000000 if doecc != 0 else 0) | (0x40000000 if checkempty != 0 else 0), start, count), "III", (None, None, None))
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    def ipodnano2g_nandwrite(self, addr, start, count, doecc):
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        """ Target-specific function: ipodnano2g
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            Writes data to the NAND chip
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        """
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        return self.lib.monitorcommand(struct.pack("IIII", 0xffff0003, addr | (0x80000000 if doecc != 0 else 0), start, count), "III", (None, None, None))
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    def ipodnano2g_nanderase(self, addr, start, count):
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        """ Target-specific function: ipodnano2g
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            Erases blocks on the NAND chip and stores the results to memory
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        """
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        return self.lib.monitorcommand(struct.pack("IIII", 0xffff0004, addr, start, count), "III", (None, None, None))
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class Lib(object):
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class Lib(object):
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    def __init__(self):
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    def __init__(self):
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        self.idVendor = 0xFFFF
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        self.idVendor = 0xFFFF
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        self.idProduct = 0xE000
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        self.idProduct = 0xE000