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gpg: fixup encoding for large packets

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This commit is contained in:
Roman Zeyde 2016-04-30 15:34:18 +03:00
parent c3d23ea7f5
commit 87ca33c104
1 changed files with 11 additions and 2 deletions
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13
trezor_agent/gpg/encode.py
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@ -13,9 +13,18 @@ log = logging.getLogger(__name__)
def packet(tag, blob):
"""Create small GPG packet."""
length_type = 1 # : 2 bytes for length
assert len(blob) < 2**32
if len(blob) < 2**8:
length_type = 0
elif len(blob) < 2**16:
length_type = 1
else:
length_type = 2
fmt = ['>B', '>H', '>L'][length_type]
leading_byte = 0x80 | (tag << 2) | (length_type)
return struct.pack('>B', leading_byte) + util.prefix_len('>H', blob)
return struct.pack('>B', leading_byte) + util.prefix_len(fmt, blob)
def subpacket(subpacket_type, fmt, *values):