[PYTHON-CRYPTO] RSA exponent
bugbee at SEANET.COM
Wed Aug 4 07:13:29 CEST 2004
Thanks Dan, that made things work a LOT better. It seems the 4-byte
prefix applies only to elements extracted from the key objects and not
to other binary strings such as hashes and signatures.
Now for the two-bit rhetorical question. Why only the key elements?
Shouldn't the key elements follow the same set of rules?
Anyway, my thanks,
On Aug 3, 2004, at 3:42 PM, Dan Berger wrote:
> It's likely because OpenSSL (and the M2 wrapper) are returning an MPI -
> which has it's length as the first four bytes and remainder being the
> number in big-endian byte order.
> On Tue, 2004-08-03 at 21:39 +0200, Larry Bugbee wrote:
>> I could use some help...
>> When I generate a RSA key pair I use 65537 as the exponent. Later
>> when I go
>> to extract the exponent I get 50397185. In hex it's actually 00 00
>> 00 03 01
>> 00 01, but if I discard the 4 high order bytes, 01 00 01 evaluates to
>> Perhaps you have a suggestion?
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