Hi Wolfgang,
On 4 September 2014 23:21, Wolfgang Denk wd@denx.de wrote:
Dear Simon & Ulf,
In message CAPnjgZ2MH8W05zgHsHXN=ETkEi2hNNZkXk6KdRnet0RebGxXqw@mail.gmail.com you wrote:
- Is there a possibility to check the signature/CRC before copying the
image to ram with imxtract?
I'm not sure of the specifics here - sometimes the image must be decompressed, etc. so in principle this is tricky to implement (but not impossible). Another option might be to zero it afterwards if the check fails?
Maybe I misunderstand the question, but: in any case we have to read the image from a storage device into memory to be able to look at the data, which is obviously needed for computing a checksum or signature.
In principle it is possible to stream the data through the hashing algorithm and thus verify it without storing it all in memory. Of course, then if the verification is successful then you would need to read it again (and perhaps even verify it again if you are paranoid) to actually run it.
Regards, Simon