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Export fingerprint of RSAkey #784

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Export fingerprint of RSAkey #784

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12 changes: 12 additions & 0 deletions lib/Crypto/PublicKey/RSA.py
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Original file line number Diff line number Diff line change
Expand Up @@ -255,6 +255,18 @@ def __str__(self):
key_type = "Public"
return "%s RSA key at 0x%X" % (key_type, id(self))

def export_fingerprint(self, hash_name = "MD5"):
bkey = self.exportKey(format='DER')
hash_names = ("MD2", "MD4", "MD5", "RIPEMD160", "SHA1",
"SHA224", "SHA256", "SHA384", "SHA512",
"SHA3_224", "SHA3_256", "SHA3_384", "SHA3_512")

if hash_name not in hash_names:
return None
hashed = __import__("Crypto.Hash." + hash_name, globals(), locals(), ["new"]).new(bkey)
chunks = [hashed.hexdigest()[i:i+2] for i in range(0, len( hashed.hexdigest()), 2)]
return ":".join(chunks)

def export_key(self, format='PEM', passphrase=None, pkcs=1,
protection=None, randfunc=None):
"""Export this RSA key.
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1 change: 1 addition & 0 deletions lib/Crypto/PublicKey/RSA.pyi
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Expand Up @@ -38,6 +38,7 @@ class RsaKey(object):
def __getstate__(self) -> None: ...
def __repr__(self) -> str: ...
def __str__(self) -> str: ...
def export_fingerprint(self, hash_name = "MD5") -> str: ...
def export_key(self, format: Optional[str]="PEM", passphrase: Optional[str]=None, pkcs: Optional[int]=1,
protection: Optional[str]=None, randfunc: Optional[RNG]=None) -> bytes: ...

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13 changes: 13 additions & 0 deletions lib/Crypto/SelfTest/PublicKey/test_import_RSA.py
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Expand Up @@ -419,6 +419,19 @@ def testExportKey15(self):
key = RSA.construct([self.n, self.e, self.d, self.p, self.q, self.pInv])
self.assertRaises(ValueError, key.export_key, 'DER', 'test', 1)

def testExportFingerPrint(self):
key = RSA.import_key(self.rsaKeyPEM)
self.assertEqual(key.export_fingerprint(), "4c:c8:ed:62:91:e3:4b:c9:9c:da:c9:2c:39:cf:3e:c2")

def testExportFingerPrint2(self):
key = RSA.import_key(self.rsaPublicKeyDER)
self.assertEqual(key.export_fingerprint(), "40:d6:a0:30:74:e1:26:1a:73:df:f0:bb:2b:a9:3b:61")

def testExportFingerPrint3(self):
key = RSA.import_key(self.rsaPublicKeyDER)
key1 = RSA.import_key(self.rsaPublicKeyPEM)
self.assertEqual(key.export_fingerprint(), key1.export_fingerprint())

def test_import_key(self):
"""Verify that import_key is an alias to importKey"""
key = RSA.import_key(self.rsaPublicKeyDER)
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