Can't import raw symmetric keys [Mac OS]
Reported by snej | April 14th, 2009 @ 06:58 PM | in 0.3
-[MYSymmetricKey initWithKeyData:algorithm:] is
unimplemented on Mac OS.
I haven't found a way to create a MYSymmetricKey object from an existing raw key (just the pure key bits). I can pass the data to SecKeyImport, but there's no way to tell it what algorithm to use, so it can't create a valid key.
Comments and changes to this ticket
-
snej April 14th, 2009 @ 07:04 PM
- Tag set to “import, mac_os, symmetric”
-
snej April 14th, 2009 @ 07:06 PM
- State changed from “new” to “open”
-
snej April 15th, 2009 @ 08:31 AM
Doug Mitchell of Apple acknowledges the problem, in 2005, and suggests using CSSM_UnwrapKey.
The Keychain.framework code has a method
-[Keychain addKey:]that appears to do this ... it's 400 lines long, though. :-P -
snej April 20th, 2009 @ 07:52 AM
- Milestone set to “0.3”
- State changed from “open” to “resolved”
Fixed in 0.3.
I had to use an undocumented/SPI function, SecKeyCreate. Not ideal, but there wasn't a reasonable workaround. I've at least marked it as weak-linked, so apps using MYCrypto will still run if this function ever disappears from Security.framework in the future.
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A high-level cryptography API for Mac OS X and iPhone.
snej