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1 #!/usr/bin/env python3 |
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2 |
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3 """ takes a pubkey, turns it into fuzzer-verify input """ |
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4 |
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5 import sys |
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6 import struct |
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7 import re |
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8 import binascii |
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9 |
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10 BLOB_RE=re.compile(r'(?:ssh-rsa|ecdsa-\S+|ssh-dss) ([a-zA-Z0-9/+=]+)') |
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11 |
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12 inp = sys.stdin.read() |
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13 b64blob = BLOB_RE.search(inp).groups(1)[0] |
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14 |
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15 blob = binascii.a2b_base64(b64blob) |
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16 |
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17 sigtypelen = struct.unpack('>I', blob[:4])[0] |
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18 sigtype = blob[4:4+sigtypelen] |
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19 print("Type is %s" % sigtype, file=sys.stderr) |
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20 |
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21 # a bodgy key followed by signature |
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22 # eg rfc4253 |
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23 # string "ssh-rsa" |
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24 # string rsa_signature_blob |
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25 sys.stdout.buffer.write(blob) |
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26 sys.stdout.buffer.write(struct.pack('>I', sigtypelen)) |
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27 sys.stdout.buffer.write(sigtype) |
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28 sys.stdout.buffer.write(struct.pack('>II', 4, 20)) |
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29 |
