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tools: implement VendorHeader and FirmwareImage classes in firmwarectl
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commit
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@ -3,11 +3,12 @@ import sys
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import struct
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import binascii
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import hashlib
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import ed25519
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# bootloader/firmware headers specification: https://github.com/trezor/trezor-core/blob/master/docs/bootloader.md
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# converts 8-bit bitmap to tuple of values
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def bitmap_to_tuple(b):
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return tuple([ i + 1 for i in range(8) if b & (1 << i) ])
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@ -83,25 +84,120 @@ class BootloaderImage:
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class VendorHeader:
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def __init__(self, data):
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pass
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header = struct.unpack('<4sIIBBBB', data[:16])
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self.magic, self.hdrlen, self.expiry, \
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self.vmajor, self.vminor, \
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self.vsig_m, self.vsig_n = header
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assert self.magic == b'TRZF'
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assert self.vsig_m > 0 and self.vsig_m <= self.vsig_n
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assert self.vsig_n > 0 and self.vsig_n <= 8
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p = 16
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self.vpub = []
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for _ in range(self.vsig_n):
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self.vpub.append(data[p:p + 32])
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p += 32
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self.vstr_len = data[p]
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p += 1
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self.vstr = data[p:p + self.vstr_len]
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p += self.vstr_len
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self.vimg_len, _ = struct.unpack('<H', data[p: p + 2])
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p += 2
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self.vimg = data[p:p + self.vimg_len]
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p += self.vimg_len
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self.sigidx = bitmap_to_tuple(data[p])
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p += 1
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self.sig = data[p:p+64]
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assert len(data) == 4 + 4 + 4 + 1 + 1 + 1 + 1 + \
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32 * len(self.vpub) + \
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1 + self.vstr_len + \
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2 + self.vimg_len + \
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1 + 64
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def print(self):
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pass
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print('TREZOR Vendor Header')
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print(' * magic :', self.magic.decode('ascii'))
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print(' * hdrlen :', self.hdrlen)
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print(' * expiry :', self.expiry)
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print(' * version : %d.%d' % (self.vmajor, self.vminor))
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print(' * scheme : %d out of %d' % (self.vsig_m, self.vsig_n))
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for i in range(self.vsig_n):
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print(' * vpub #%d :' % (i + 1), binascii.hexlify(self.vpub[i]).decode('ascii'))
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print(' * vstr :', self.vstr.decode('ascii'))
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print(' * vimg : (%d bytes)', len(self.vimg))
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print(' * sigidx :', self.sigidx)
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print(' * sig :', binascii.hexlify(self.sig).decode('ascii'))
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def header(self, sig=True):
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header = struct.pack('<4sIIBBBB', \
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self.magic, self.hdrlen, self.expiry, \
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self.vmajor, self.vminor, \
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self.vsig_m, self.vsig_n)
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for i in range(self.vsig_n):
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header += self.vpub[i]
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header += struct.pack('<B', self.vstr_len) + self.vstr
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header += struct.pack('<H', self.vimg_len) + self.vimg
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if sig:
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sigidx = tuple_to_bitmap(self.sigidx)
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header += struct.pack('<B64s', sigidx, self.sig)
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else:
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header += 65 * b'\x00'
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return header
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def sign(self):
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pass
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header = self.header(sig=False)
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self.sigidx, self.sig = get_sig(header)
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def write(self, filename):
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with open(filename, 'wb') as f:
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f.write(self.header())
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class FirmwareImage:
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def __init__(self, data):
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pass
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header = struct.unpack('<4sIIIBBBB171sB64s', data[:256])
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self.magic, self.hdrlen, self.expiry, self.codelen, \
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self.vmajor, self.vminor, self.vpatch, self.vbuild, \
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self.reserved, self.sigidx, self.sig = header
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assert self.magic == b'TRZF'
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assert self.hdrlen == 256
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assert self.codelen % 4 == 0
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assert self.reserved == 171 * b'\x00'
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self.sigidx = bitmap_to_tuple(self.sigidx)
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self.code = data[256:]
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assert len(self.code) == self.codelen
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def print(self):
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pass
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print('TREZOR Firmware Image')
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print(' * magic :', self.magic.decode('ascii'))
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print(' * hdrlen :', self.hdrlen)
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print(' * expiry :', self.expiry)
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print(' * codelen :', self.codelen)
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print(' * version : %d.%d.%d.%d' % (self.vmajor, self.vminor, self.vpatch, self.vbuild))
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print(' * sigidx :', self.sigidx)
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print(' * sig :', binascii.hexlify(self.sig).decode('ascii'))
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def header(self, sig=True):
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header = struct.pack('<4sIIIBBBB171s', \
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self.magic, self.hdrlen, self.expiry, self.codelen, \
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self.vmajor, self.vminor, self.vpatch, self.vbuild, \
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self.reserved)
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if sig:
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sigidx = tuple_to_bitmap(self.sigidx)
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header += struct.pack('<B64s', sigidx, self.sig)
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else:
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header += 65 * b'\x00'
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return header
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def sign(self):
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pass
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header = self.header(sig=False)
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data = header + self.code
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self.sigidx, self.sig = get_sig(data)
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def write(self, filename):
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with open(filename, 'wb') as f:
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f.write(self.header())
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f.write(self.code)
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def binopen(filename):
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