Viewing file:  sshkey.py (3.48 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
# Read unencrypted PKCS#1/PKIX-compliant, PEM&DER encoded private keys on
# stdin, print them pretty and encode back into original wire format.
# Private keys can be generated with "openssl genrsa|gendsa" commands.
import sys, string, base64
from pyasn1.type import univ, namedtype, namedval, constraint
from pyasn1.codec.der import encoder, decoder
class DSAPrivateKey(univ.Sequence):
"""PKIX compliant DSA private key structure"""
componentType = namedtype.NamedTypes(
namedtype.NamedType('version', univ.Integer(namedValues=namedval.NamedValues(('v1', 0)))),
namedtype.NamedType('p', univ.Integer()),
namedtype.NamedType('q', univ.Integer()),
namedtype.NamedType('g', univ.Integer()),
namedtype.NamedType('public', univ.Integer()),
namedtype.NamedType('private', univ.Integer())
)
MAX = 16
class OtherPrimeInfo(univ.Sequence):
componentType = namedtype.NamedTypes(
namedtype.NamedType('prime', univ.Integer()),
namedtype.NamedType('exponent', univ.Integer()),
namedtype.NamedType('coefficient', univ.Integer())
)
class OtherPrimeInfos(univ.SequenceOf):
componentType = OtherPrimeInfo()
subtypeSpec = univ.SequenceOf.subtypeSpec + \
constraint.ValueSizeConstraint(1, MAX)
class RSAPrivateKey(univ.Sequence):
"""PKCS#1 compliant RSA private key structure"""
componentType = namedtype.NamedTypes(
namedtype.NamedType('version', univ.Integer(namedValues=namedval.NamedValues(('two-prime', 0), ('multi', 1)))),
namedtype.NamedType('modulus', univ.Integer()),
namedtype.NamedType('publicExponent', univ.Integer()),
namedtype.NamedType('privateExponent', univ.Integer()),
namedtype.NamedType('prime1', univ.Integer()),
namedtype.NamedType('prime2', univ.Integer()),
namedtype.NamedType('exponent1', univ.Integer()),
namedtype.NamedType('exponent2', univ.Integer()),
namedtype.NamedType('coefficient', univ.Integer()),
namedtype.OptionalNamedType('otherPrimeInfos', OtherPrimeInfos())
)
keyMagic = {
'-----BEGIN DSA PRIVATE KEY-----':
{'-----END DSA PRIVATE KEY-----': DSAPrivateKey() },
'-----BEGIN RSA PRIVATE KEY-----':
{'-----END RSA PRIVATE KEY-----': RSAPrivateKey() }
}
# Read PEM keys from stdin and print them out in plain text
stSpam, stHam, stDump = 0, 1, 2
state = stSpam
keyCnt = 0
for keyLine in sys.stdin.readlines():
keyLine = string.strip(keyLine)
if state == stSpam:
if state == stSpam:
if keyMagic.has_key(keyLine):
keyMagicTail = keyMagic[keyLine]
keyLines = []
state = stHam
continue
if state == stHam:
if keyMagicTail.has_key(keyLine):
asn1Spec = keyMagicTail[keyLine]
state = stDump
else:
keyLines.append(keyLine)
if state == stDump:
substrate = ''
try:
for keyLine in keyLines:
substrate = substrate + base64.decodestring(keyLine)
except TypeError, why:
print '%s, possibly encrypted key' % (why, )
state = stSpam
continue
key = decoder.decode(substrate, asn1Spec=asn1Spec)[0]
print key.prettyPrint()
if encoder.encode(key) != substrate:
print 'key re-code yields a diff!'
keyCnt = keyCnt + 1
state = stSpam
print '*** %s private key(s) re/serialized' % keyCnt
|