Re: Share and store RSA - public key in java server and vice versa
Re: Share and store RSA - public key in java server and vice versa
- Subject: Re: Share and store RSA - public key in java server and vice versa
- From: Maxthon Chan <email@hidden>
- Date: Wed, 14 May 2014 00:33:40 +0800
Whatever that is there is, for 100% sure, some form of standardised format that iOS, Android and your Java server will be able to deal with with higher level API.
You can just send PEM over and let higher-level API handle it.
On May 14, 2014, at 0:29, Jens Alfke <email@hidden> wrote:
>
> On May 13, 2014, at 8:55 AM, Maxthon Chan <email@hidden> wrote:
>
>> I am not exactly familiar with using RSA but as long as the format is followed I believe whatever mechanism here is okay.
>
> This is actually kind of problematic. There are a number of formats for encoding public keys, and of course they vary by the type of key (RSA, ECC, etc.) Most software seems to expect that public keys are going to be encapsulated in X.509 certificates instead of being sent around by themselves, so there doesn’t seem to be a standard way to do it.
>
> RSA public keys seem to get encoded as a DER-encoded ASN.1 sequence containing the modulus and exponent, but I’ve seen at least two slightly different formats for that. (I spent several really frustrating days once trying to figure out what the format is of the public key data you get out of the iOS keychain.)
>
>> Also if I didn’t made it wrong DER certificates are text files.
>
> No, DER is a binary encoding of ASN.1 syntax. The text formats you’re thinking of, like PEM, are wrappers around base64-encoded DER.
>
> —Jens
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