root / snf-cyclades-app / synnefo / userdata / util.py @ a8333def
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1 | 8bf3a249 | Kostas Papadimitriou | import binascii |
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2 | 8bf3a249 | Kostas Papadimitriou | |
3 | b47b110d | Kostas Papadimitriou | from synnefo.userdata.asn1 import DerObject, DerSequence |
4 | 8bf3a249 | Kostas Papadimitriou | |
5 | 8bf3a249 | Kostas Papadimitriou | def exportKey(keyobj, format='PEM'): |
6 | 8bf3a249 | Kostas Papadimitriou | """Export the RSA key. A string is returned
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7 | 8bf3a249 | Kostas Papadimitriou | with the encoded public or the private half
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8 | 8bf3a249 | Kostas Papadimitriou | under the selected format.
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9 | 8bf3a249 | Kostas Papadimitriou |
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10 | 8bf3a249 | Kostas Papadimitriou | format: 'DER' (PKCS#1) or 'PEM' (RFC1421)
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11 | 8bf3a249 | Kostas Papadimitriou | """
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12 | 8bf3a249 | Kostas Papadimitriou | der = DerSequence() |
13 | 8bf3a249 | Kostas Papadimitriou | if keyobj.has_private():
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14 | 8bf3a249 | Kostas Papadimitriou | keyType = "RSA PRIVATE"
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15 | 8bf3a249 | Kostas Papadimitriou | der[:] = [ 0, keyobj.n, keyobj.e, keyobj.d, keyobj.p, keyobj.q,
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16 | 8bf3a249 | Kostas Papadimitriou | keyobj.d % (keyobj.p-1), keyobj.d % (keyobj.q-1), |
17 | 8bf3a249 | Kostas Papadimitriou | keyobj.u ] |
18 | 8bf3a249 | Kostas Papadimitriou | else:
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19 | 8bf3a249 | Kostas Papadimitriou | keyType = "PUBLIC"
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20 | 8bf3a249 | Kostas Papadimitriou | der.append('\x30\x0D\x06\x09\x2A\x86\x48\x86\xF7\x0D\x01\x01\x01\x05\x00')
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21 | 8bf3a249 | Kostas Papadimitriou | bitmap = DerObject('BIT STRING')
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22 | 8bf3a249 | Kostas Papadimitriou | derPK = DerSequence() |
23 | 8bf3a249 | Kostas Papadimitriou | derPK[:] = [ keyobj.n, keyobj.e ] |
24 | 8bf3a249 | Kostas Papadimitriou | bitmap.payload = '\x00' + derPK.encode()
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25 | 8bf3a249 | Kostas Papadimitriou | der.append(bitmap.encode()) |
26 | 8bf3a249 | Kostas Papadimitriou | if format=='DER': |
27 | 8bf3a249 | Kostas Papadimitriou | return der.encode()
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28 | 8bf3a249 | Kostas Papadimitriou | if format=='PEM': |
29 | 8bf3a249 | Kostas Papadimitriou | pem = "-----BEGIN %s KEY-----\n" % keyType
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30 | 8bf3a249 | Kostas Papadimitriou | binaryKey = der.encode() |
31 | 8bf3a249 | Kostas Papadimitriou | # Each BASE64 line can take up to 64 characters (=48 bytes of data)
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32 | 8bf3a249 | Kostas Papadimitriou | chunks = [ binascii.b2a_base64(binaryKey[i:i+48]) for i in range(0, len(binaryKey), 48) ] |
33 | 8bf3a249 | Kostas Papadimitriou | pem += ''.join(chunks)
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34 | 8bf3a249 | Kostas Papadimitriou | pem += "-----END %s KEY-----" % keyType
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35 | 8bf3a249 | Kostas Papadimitriou | return pem
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36 | 8bf3a249 | Kostas Papadimitriou | return ValueError("") |