Reading ssh pub/private keys
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In reply to this post
by Rob Withers
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FYI, attached is my simple DSA key reader. It does not use the Crypto
package. Sorry, we are space-constrained on the OLPC -- mine is about 30 lines of code including ASN.1 decoding. It helps a lot if you know precisely what to expect ;) I also attached a test key, it was generated with ssh-keygen -t dsa -f test.key So thanks anyway, you pointed me into the right direction and starting from a working example was a great help! - Bert - On Mar 30, 2007, at 11:36 , Bert Freudenberg wrote: > Hi Rob, > > turns out the private key file has the public part in it, too, it > stores (0, p, q, g, y, x). DSAPrivateKeyFileReader assumes some > more fields whereas my key just has the blob data in it, and it is > not encrypted by a passphrase. Using the ASN.1 reader on my blob > worked fine, though. > > Thanks a lot! > > - Bert - > > On Mar 29, 2007, at 15:33 , Robert Withers wrote: > >> Bert, there are indeed Base64 encoded. For starters, you can try: >> >> (DSAPrivateKeyFileReader fromFile: privateKeyFileName) asPrivateKey >> >> I am not sure about the publicKey, but you could try the same >> reader code. Internally, it strips off the PEM markings (----- >> BEGIN DSA...and so on), the does a Base64 decode and leaves you >> with bytes. The #asPrivateKey will take those bytes and do an ASN. >> 1 decode on them. My point is that the PublicKey may also be ASN. >> 1 encoded, so you may find some traction here. >> >> Let me know how it goes. >> >> Are you implementing SSH?! >> >> cheers, >> Robert >> >> On Mar 29, 2007, at 6:23 AM, Bert Freudenberg wrote: >> >>> Hi folks, >>> >>> I have an ssh-format keypair and would like to extract the >>> (p,q,g,x) and (p,q,g,y) DSA tuples from that. The private key >>> looks like this: >>> >>> -----BEGIN DSA PRIVATE KEY----- >>> MIIBuwIB..............XCIa3cIp >>> -----END DSA PRIVATE KEY----- >>> >>> and the public key: >>> >>> ssh-dss AAAAB3NzaC1k.........nNEnWCasjXraVA== >>> >>> So this looks like Base64-encoded numbers, but how are they >>> encoded? The only reference I found was this: >>> >>> http://www.openssh.com/txt/draft-ietf-secsh-publickeyfile-02.txt >>> >>> But it does not detail how the "binary blob" translates to DSA >>> tuples. >>> >>> - Bert - >>> _______________________________________________ Cryptography mailing list [hidden email] http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/cryptography |
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