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Follow GPG implementation for subpacket prefix encoding.

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Conflicts:
	trezor_agent/gpg/protocol.py
This commit is contained in:
Roman Zeyde
2016-09-28 17:23:11 +03:00
parent 016e864503
commit 91146303a3
2 changed files with 20 additions and 11 deletions
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20
trezor_agent/gpg/protocol.py
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@@ -47,17 +47,17 @@ def subpacket_byte(subpacket_type, value):
return subpacket(subpacket_type, '>B', value)
def subpacket_prefix_len(blob):
"""Prefix GPG subpacket with the encoding of it's length."""
if len(blob) < 2**8:
length_type = 0
elif len(blob) < 2**16:
length_type = 1
def subpacket_prefix_len(item):
"""Prefix subpacket length according to RFC 4880 section-5.2.3.1."""
n = len(item)
if n >= 8384:
prefix = b'\xFF' + struct.pack('>L', n)
elif n >= 192:
n = n - 192
prefix = struct.pack('BB', (n // 256) + 192, n % 256)
else:
length_type = 2
fmt = ['>B', '>H', '>L'][length_type]
prefix = [b'', b'', struct.pack('>B', 255)][length_type]
return prefix + struct.pack(fmt, len(blob)) + blob
prefix = struct.pack('B', n)
return prefix + item
def subpackets(*items):