mirror of https://gerrit.osmocom.org/pysim
SJA2: Implement DF.SYSTEM/EF.0348_KEY using construct
This implicitly adds support for JSON->binary encoding, not just decoding (previous code predating construct support). Change-Id: I0994d9f66a504dd3c60b43ed5cf6645515dcbc6a
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@ -87,6 +87,26 @@ class Rpad(Adapter):
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len(obj), self.sizeof()))
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return obj + self.pattern * (self.sizeof() - len(obj))
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class MultiplyAdapter(Adapter):
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"""
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Decoder multiplies by multiplicator
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Encoder divides by multiplicator
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Parameters:
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subcon: Subconstruct as defined by construct library
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multiplier: Multiplier to apply to raw encoded value
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"""
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def __init__(self, subcon, multiplicator):
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super().__init__(subcon)
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self.multiplicator = multiplicator
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def _decode(self, obj, context, path):
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return obj * 8
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def _encode(self, obj, context, path):
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return obj // 8
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class GsmStringAdapter(Adapter):
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"""Convert GSM 03.38 encoded bytes to a string."""
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@ -86,19 +86,15 @@ class EF_MILENAGE_CFG(TransparentEF):
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class EF_0348_KEY(LinFixedEF):
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def __init__(self, fid='6f22', name='EF.0348_KEY', desc='TS 03.48 OTA Keys'):
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super().__init__(fid, name=name, desc=desc, rec_len=(27, 35))
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def _decode_record_bin(self, raw_bin_data, **kwargs):
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u = unpack('!BBB', raw_bin_data[0:3])
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key_algo = (u[2] >> 6) & 1
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key_length = ((u[2] >> 3) & 3) * 8
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return {'sec_domain': u[0],
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'key_set_version': u[1],
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'key_type': key_type2str[u[2] & 3],
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'key_length': key_length,
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'algorithm': key_algo2str[key_algo],
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'mac_length': mac_length[(u[2] >> 7)],
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'key': raw_bin_data[3:key_length].hex()
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}
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KeyLenAndType = BitStruct('mac_length'/Mapping(Bit, {8:0, 4:1}),
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'algorithm'/Enum(Bit, des=0, aes=1),
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'key_length'/MultiplyAdapter(BitsInteger(3), 8),
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'_rfu'/BitsRFU(1),
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'key_type'/Enum(BitsInteger(2), kic=0, kid=1, kik=2, any=3))
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self._construct = Struct('security_domain'/Int8ub,
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'key_set_version'/Int8ub,
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'key_len_and_type'/KeyLenAndType,
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'key'/HexAdapter(Bytes(this.key_len_and_type.key_length)))
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class EF_0348_COUNT(LinFixedEF):
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