[Cryptography Team] Reading ssh pub/private keys

[Bert Freudenberg]

Hmm, the latest release on Squeakmap is for Squeak 3.4 ...

For OLPC see http://laptop.org

- Bert -

On Mar 29, 2007, at 16:38 , Robert Withers wrote:

> It's in the Cryptography-X509 package.
>
> What exactly is OLPC?  I keep reading that acronym.
>
> Rob
>
> On Mar 29, 2007, at 6:45 AM, Bert Freudenberg wrote:
>
>> Thanks Rob, I'll try that (provided I find the  
>> DSAPrivateKeyFileReader class).
>>
>> I'm not implementing ssh, but the OLPC happens to use that file  
>> format for their per-user keys. So rather than generating our own  
>> (via SecurityManager>>generateLocalKeyPair) which takes a rather  
>> long time on that slow machine, I'd rather just load that.
>>
>> - 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 -
>>>>
>>>>
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>>
>>
>>
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